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Cisco ME 2400 Ethernet Access Switch
Cisco IOS Commandsclear ip arp inspection statistics
clear policer cpu uni-eni counters
clear spanning-tree detected-protocols
deny (ARP access-list configuration)
deny (MAC access-list configuration)
errdisable detect cause small-frame
errdisable recovery cause small-frame
ip arp inspection vlan logging
ip dhcp snooping information option
ip dhcp snooping information option allowed-untrusted
ip dhcp snooping information option format remote-id
ip dhcp snooping verify mac-address
ip dhcp snooping vlan information option format-type circuit-id string
ip igmp snooping last-member-query-interval
ip igmp snooping report-suppression
ip igmp snooping vlan immediate-leave
mac address-table notification
match (access-map configuration)
permit (ARP access-list configuration)
permit (MAC access-list configuration)
policer aggregate (global configuration)
police aggregate (policy-map class configuration)
renew ip dhcp snooping database
Cisco ME 2400 Ethernet Access Switch
Cisco IOS Commands
aaa accounting dot1x
Use the aaa accounting dot1x global configuration command to enable authentication, authorization, and accounting (AAA) accounting and to create method lists defining specific accounting methods on a per-line or per-interface basis for IEEE 802.1x sessions. Use the no form of this command to disable IEEE 802.1x accounting.
aaa accounting dot1x {name | default} start-stop {broadcast group {name | radius | tacacs+} [group {name | radius | tacacs+}... ] | group {name | radius | tacacs+} [group {name | radius | tacacs+} ... ]}
no aaa accounting dot1x {name | default}
Syntax Description
Defaults
AAA accounting is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
This command requires access to a RADIUS server.
Note
We recommend that you enter the dot1x reauthentication interface configuration command before configuring IEEE 802.1x RADIUS accounting on an interface.
Examples
This example shows how to configure IEEE 802.1x accounting:
Switch(config)# aaa accounting dot1xSwitch(config)# aaa accounting dot1x default start-stop group radiusSwitch(config)#
Note
Related Commands
Specifies one or more AAA methods for use on interfaces running IEEE 802.1x.
aaa-new-model
Enables the AAA access control model. For syntax information, see the Cisco IOS Security Command Reference, Release 12.2> Authentication, Authorization, and Accounting > Authentication Commands.
Enables or disables periodic re-authentication.
dot1x timeout reauth period
Sets the number of seconds between re-authentication attempts.
aaa authentication dot1x
Use the aaa authentication dot1x global configuration command to specify the authentication, authorization, and accounting (AAA) method to use on ports complying with IEEE 802.1x. Use the no form of this command to disable authentication.
aaa authentication dot1x {default} method1
no aaa authentication dot1x {default}
Syntax Description
Note
Defaults
No authentication is performed.
Command Modes
Global configuration
Command History
Usage Guidelines
The method argument identifies the method that the authentication algorithm tries in the given sequence to validate the password provided by the client. The only method that is truly IEEE 802.1x-compliant is the group radius method, in which the client data is validated against a RADIUS authentication server.
If you specify group radius, you must configure the RADIUS server by entering the radius-server host global configuration command.
Use the show running-config privileged EXEC command to display the configured lists of authentication methods.
Examples
This example shows how to enable AAA and how to create an IEEE 802.1x-compliant authentication list. This authentication first tries to contact a RADIUS server. If this action returns an error, the user is not allowed access to the network.
Switch(config)# aaa new-modelSwitch(config)# aaa authentication dot1x default group radiusYou can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
aaa new-model
Enables the AAA access control model. For syntax information, see the Cisco IOS Security Command Reference, Release 12.2 > Authentication, Authorization, and Accounting > Authentication Commands.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
action
Use the action access-map configuration command to set the action for the VLAN access map entry. Use the no form of this command to set the action to the default value, which is to forward.
action {drop | forward}
no action
Syntax Description
drop
Drop the packet when the specified conditions are matched.
forward
Forward the packet when the specified conditions are matched.
Defaults
The default action is to forward packets.
Command Modes
Access-map configuration
Command History
Usage Guidelines
You enter access-map configuration mode by using the vlan access-map global configuration command.
If the action is drop, you should define the access map, including configuring any access control list (ACL) names in match clauses, before applying the map to a VLAN, or all packets could be dropped.
In access-map configuration mode, use the match access-map configuration command to define the match conditions for a VLAN map. Use the action command to set the action that occurs when a packet matches the conditions.
The drop and forward parameters are not used in the no form of the command.
Examples
This example shows how to identify and apply a VLAN access map vmap4 to VLANs 5 and 6 that causes the VLAN to forward an IP packet if the packet matches the conditions defined in access list al2:
Switch(config)# vlan access-map vmap4Switch(config-access-map)# match ip address al2Switch(config-access-map)# action forwardSwitch(config-access-map)# exitSwitch(config)# vlan filter vmap4 vlan-list 5-6You can verify your settings by entering the show vlan access-map privileged EXEC command.
Related Commands
archive download-sw
Use the archive download-sw privileged EXEC command to download a new image from a TFTP server to the switch and to overwrite or keep the existing image.
archive download-sw {/force-reload | /imageonly | /leave-old-sw | /no-set-boot | /no-version-check | /overwrite | /reload | /safe} source-url
Syntax Description
Defaults
The current software image is not overwritten with the downloaded image.
Both the software image and HTML files are downloaded.
The new image is downloaded to the flash: file system.
The BOOT environment variable is changed to point to the new software image on the flash: file system.
Image names are case sensitive; the image file is provided in tar format.
Compatibility of the version on the image to be downloaded is checked.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
The /imageonly option removes the HTML files for the existing image if the existing image is being removed or replaced. Only the Cisco IOS image (without the HTML files) is downloaded.
Using the /safe or /leave-old-sw option can cause the new image download to fail if there is insufficient flash memory. If leaving the software in place prevents the new image from fitting in flash memory due to space constraints, an error results.
If you used the /leave-old-sw option and did not overwrite the old image when you downloaded the new one, you can remove the old image by using the delete privileged EXEC command. For more information, see the "delete" section.
Note
Use the /overwrite option to overwrite the image on the flash device with the downloaded one.
If you specify the command without the /overwrite option, the download algorithm verifies that the new image is not the same as the one on the switch flash device. If the images are the same, the download does not occur. If the images are different, the old image is deleted, and the new one is downloaded.
After downloading a new image, enter the reload privileged EXEC command to begin using the new image, or specify the /reload or /force-reload option in the archive download-sw command.
Examples
This example shows how to download a new image from a TFTP server at 172.20.129.10 and overwrite the image on the switch:
Switch# archive download-sw /overwrite tftp://172.20.129.10/test-image.tarThis example shows how to download only the software image from a TFTP server at 172.20.129.10 to the switch:
Switch# archive download-sw /imageonly tftp://172.20.129.10/test-image.tarThis example shows how to keep the old software version after a successful download:
Switch# archive download-sw /leave-old-sw tftp://172.20.129.10/test-image.tarRelated Commands
archive tar
Use the archive tar privileged EXEC command to create a tar file, list files in a tar file, or extract the files from a tar file.
archive tar {/create destination-url flash:/file-url} | {/table source-url} | {/xtract source-url flash:/file-url [dir/file...]}
Syntax Description
Defaults
None
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Filenames and directory names are case sensitive.
Image names are case sensitive.
Examples
This example shows how to create a tar file. The command writes the contents of the new-configs directory on the local flash device to a file named saved.tar on the TFTP server at 172.20.10.30:
Switch# archive tar /create tftp:172.20.10.30/saved.tar flash:/new-configsThis example shows how to display the contents of the file that is in flash memory. The contents of the tar file appear on the screen:
Switch# archive tar /table flash:image_name-mz.122-release.tarinfo (219 bytes)image_name-mz.122-release/(directory)image_name-mz.122-release(610856 bytes)image_name-mz.122-release/info (219 bytes)info.ver (219 bytes)This example shows how to display only the html directory and its contents:
Switch# archive tar /table flash:image_name-mz.122-release.tar image_name-mz.122-release/htmlimage_name-mz.122-release/html/ (directory)image_name-mz.122-release/html/const.htm (556 bytes)image_name-mz.122-release/html/xhome.htm (9373 bytes)image_name-mz.122-release/html/menu.css (1654 bytes)<output truncated>This example shows how to extract the contents of a tar file on the TFTP server at 172.20.10.30. This command extracts just the new-configs directory into the root directory on the local flash file system. The remaining files in the saved.tar file are ignored.
Switch# archive tar /xtract tftp://172.20.10.30/saved.tar flash:/ new-configsRelated Commands
Downloads a new image from a TFTP server to the switch.
Uploads an existing image on the switch to a server.
archive upload-sw
Use the archive upload-sw privileged EXEC command to upload an existing switch image to a server.
archive upload-sw [/version version_string] destination-url
Syntax Description
Defaults
Uploads the currently running image from the flash: file system.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use the upload feature only if the HTML files associated with the embedded device manager have been installed with the existing image.
The files are uploaded in this sequence: the Cisco IOS image, the HTML files, and info. After these files are uploaded, the software creates the tar file.
Image names are case sensitive.
Examples
This example shows how to upload the currently running image to a TFTP server at 172.20.140.2:
Switch# archive upload-sw tftp://172.20.140.2/test-image.tarRelated Commands
Downloads a new image to the switch.
Creates a tar file, lists the files in a tar file, or extracts the files from a tar file.
arp access-list
Use the arp access-list global configuration command to define an Address Resolution Protocol (ARP) access control list (ACL) or to add clauses to the end of a previously defined list. Use the no form of this command to delete the specified ARP access list.
arp access-list acl-name
no arp access-list acl-name
Syntax Description
Defaults
No ARP access lists are defined.
Command Modes
Global configuration
Command History
Usage Guidelines
After entering the arp access-list command, you enter ARP access-list configuration mode, and these configuration commands are available:
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Use the permit and deny access-list configuration commands to forward and to drop ARP packets based on the specified matching criteria.
When the ARP ACL is defined, you can apply it to a VLAN by using the ip arp inspection filter vlan global configuration command. ARP packets containing only IP-to-MAC address bindings are compared to the ACL. All other types of packets are bridged in the ingress VLAN without validation. If the ACL permits a packet, the switch forwards it. If the ACL denies a packet because of an explicit deny statement, the switch drops the packet. If the ACL denies a packet because of an implicit deny statement, the switch compares the packet to the list of DHCP bindings (unless the ACL is static, which means that packets are not compared to the bindings).
Examples
This example shows how to define an ARP access list and to permit both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd:
Switch(config)# arp access-list static-hostsSwitch(config-arp-nacl)# permit ip host 1.1.1.1 mac host 00001.0000.abcdSwitch(config-arp-nacl)# endYou can verify your settings by entering the show arp access-list privileged EXEC command.
Related Commands
bandwidth
Use the bandwidth policy-map class configuration command to configure class-based weighted fair queuing (CBWFQ) by setting the output bandwidth for a policy-map class. Use the no form of this command to remove the bandwidth setting for the class.
bandwidth {rate | percent value | remaining percent value}
no bandwidth [rate | percent value | remaining percent value]
Syntax Description
Defaults
No bandwidth is defined.
Command Modes
Policy-map class configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
Support was added to configure the bandwidth command in the class-default of an output policy map.
Usage Guidelines
You use the bandwidth policy-map class command to control output traffic. The bandwidth command specifies the bandwidth for traffic in that class. CBWFQ derives the weight for packets belonging to the class from the bandwidth allocated to the class and uses the weight to ensure that the queue for that class is serviced fairly. Bandwidth settings are not supported in input policy maps.
When you configure bandwidth for a class of traffic as an absolute rate (kbps) or a percentage of bandwidth (percent value), it represents the minimum bandwidth guarantee or committed information rate (CIR) for that traffic class. This means that the traffic class gets at least the bandwidth specified in the command, but is not limited to that bandwidth. Any excess bandwidth on the port is allocated to each class in the same ratio as the configured CIR rates.
When you enter the bandwidth remaining percent command, hard bandwidths are not guaranteed, and only relative bandwidths are assured. Class bandwidths are always proportional to the specified bandwidth percentages configured for the port.
When you configure bandwidth in an output policy, you must specify the same units in each bandwidth configuration; that is, all absolute values (rates) or percentages.
The total rate of the minimum bandwidth guarantees for each queue of the policy cannot exceed the total speed for the interface. If the percent keyword is used, the sum of the class bandwidth percentages cannot exceed 100 percent.
Using the queue-limit command to modify the default queue limit is especially important on higher-speed interfaces so that they meet the minimum bandwidth guarantees required by the interface.
You cannot use the bandwidth policy-map class configuration command to configure CBWFQ and the shape average command to configure class-based shaping for the same class in a policy map.
You cannot configure bandwidth in a class that includes priority queuing (configured with the priority policy-map class configuration command).
Examples
This example shows how to set the precedence of output queues by setting bandwidth in kilobits per second. The classes outclass1, outclass2, and outclass3 get a minimum of 50000, 20000, and 10000 kbps. The class class-default at a minimum gets the remaining bandwidth.
Switch(config)# policy-map out-policySwitch(config-pmap)# class outclass1Switch(config-pmap-c)# bandwidth 50000Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass2Switch(config-pmap-c)# bandwidth 20000Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass3Switch(config-pmap-c)# bandwidth 10000Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet 0/1Switch(config-if)# service-policy output out-policySwitch(config-if)# exitThis example shows how to set the precedence of output queues by allocating percentages of the total available bandwidth to each traffic class.The classes outclass1, outclass2, and outclass3 get a minimum of 50, 20, and 10 percent. The class class-default at a minimum gets 20 percent.
Switch(config)# policy-map out-policySwitch(config-pmap)# class outclass1Switch(config-pmap-c)# bandwidth percent 50Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass2Switch(config-pmap-c)# bandwidth percent 20Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass3Switch(config-pmap-c)# bandwidth percent 10Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet 0/1Switch(config-if)# service-policy output out-policySwitch(config-if)# exitThis example shows how to set outclass1 as a priority queue, with outclass2, and outclass3 getting 50 and 20 percent, respectively, of the bandwidth remaining after the priority queue is serviced. The class class-default gets the remaining 30 percent with no guarantees.
Switch(config)# policy-map out-policySwitch(config-pmap)# class outclass1Switch(config-pmap-c)# prioritySwitch(config-pmap-c)# exitSwitch(config-pmap)# class outclass2Switch(config-pmap-c)# bandwidth remaining percent 50Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass3Switch(config-pmap-c)# bandwidth remaining percent 20Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet 0/1Switch(config-if)# service-policy output out-policySwitch(config-if)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
boot config-file
Use the boot config-file global configuration command to specify the filename that Cisco IOS uses to read and write a nonvolatile copy of the system configuration. Use the no form of this command to return to the default setting.
boot config-file flash:/file-url
no boot config-file
Syntax Description
Defaults
The default configuration file is flash:config.text.
Command Modes
Global configuration
Command History
Usage Guidelines
Filenames and directory names are case sensitive.
This command changes the setting of the CONFIG_FILE environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
boot enable-break
Use the boot enable-break global configuration command to enable interrupting the automatic boot process. Use the no form of this command to return to the default setting.
boot enable-break
no boot enable-break
Syntax Description
This command has no arguments or keywords.
Defaults
Disabled. The automatic boot process cannot be interrupted by pressing the Break key on the console.
Command Modes
Global configuration
Command History
Usage Guidelines
When you enter this command, you can interrupt the automatic boot process by pressing the break key on the console after the flash file system is initialized. The break key is different for each operating system:
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This command changes the setting of the ENABLE_BREAK environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
boot helper
Use the boot helper global configuration command to dynamically load files during boot loader initialization to extend or patch the functionality of the boot loader. Use the no form of this command to return to the default.
boot helper filesystem:/file-url ...
no boot helper
Syntax Description
Defaults
No helper files are loaded.
Command Modes
Global configuration
Command History
Usage Guidelines
This variable is used only for internal development and testing.
Filenames and directory names are case sensitive.
This command changes the setting of the HELPER environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
boot helper-config-file
Use the boot helper-config-file global configuration command to specify the name of the configuration file to be used by the Cisco IOS helper image. If this is not set, the file specified by the CONFIG_FILE environment variable is used by all versions of Cisco IOS that are loaded. Use the no form of this command to return to the default setting.
boot helper-config-file filesystem:/file-url
no boot helper-config file
Syntax Description
filesystem:
Alias for a flash file system. Use flash: for the system board flash device.
/file-url
The path (directory) and helper configuration file to load.
Defaults
No helper configuration file is specified.
Command Modes
Global configuration
Command History
Usage Guidelines
This variable is used only for internal development and testing.
Filenames and directory names are case sensitive.
This command changes the setting of the HELPER_CONFIG_FILE environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
boot manual
Use the boot manual global configuration command to enable manually booting the switch during the next boot cycle. Use the no form of this command to return to the default setting.
boot manual
no boot manual
Syntax Description
This command has no arguments or keywords.
Defaults
Manual booting is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
The next time you reboot the system, the switch is in boot loader mode, which is shown by the switch: prompt. To boot the system, use the boot boot loader command, and specify the name of the bootable image.
This command changes the setting of the MANUAL_BOOT environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
boot private-config-file
Use the boot private-config-file global configuration command to specify the filename that Cisco IOS uses to read and write a nonvolatile copy of the private configuration. Use the no form of this command to return to the default setting.
boot private-config-file filename
no boot private-config-file
Syntax Description
Defaults
The default configuration file is private-config.
Command Modes
Global configuration
Command History
Usage Guidelines
Filenames are case sensitive.
Examples
This example shows how to specify the name of the private configuration file to be pconfig:
Switch(config)# boot private-config-file pconfigRelated Commands
boot system
Use the boot system global configuration command to specify the Cisco IOS image to load during the next boot cycle. Use the no form of this command to return to the default setting.
boot system filesystem:/file-url ...
no boot system
Syntax Description
filesystem:
Alias for a flash file system. Use flash: for the system board flash device.
/file-url
The path (directory) and name of a bootable image. Separate image names with a semicolon.
Defaults
The switch attempts to automatically boot the system by using information in the BOOT environment variable. If this variable is not set, the switch attempts to load and execute the first executable image it can by performing a recursive, depth-first search throughout the flash file system. In a depth-first search of a directory, each encountered subdirectory is completely searched before continuing the search in the original directory.
Command Modes
Global configuration
Command History
Usage Guidelines
Filenames and directory names are case sensitive.
If you are using the archive download-sw privileged EXEC command to maintain system images, you never need to use the boot system command. The boot system command is automatically manipulated to load the downloaded image.
This command changes the setting of the BOOT environment variable. For more information, see Appendix A, "Cisco ME 2400 Ethernet Access Switch Boot Loader Commands."
Related Commands
channel-group
Use the channel-group interface configuration command to assign an Ethernet port to an EtherChannel group. Use the no form of this command to remove an Ethernet port from an EtherChannel group.
channel-group channel-group-number mode {active | {auto [non-silent] | desirable [non-silent] | on} | passive}
no channel-group
PAgP modes:
channel-group channel-group-number mode {auto [non-silent] | {desirable [non-silent]}LACP modes:
channel-group channel-group-number mode {active | passive}On mode:
channel-group channel-group-number mode on
Note
Syntax Description
Defaults
No channel groups are assigned.
No mode is configured.
Command Modes
Interface configuration
Command History
Usage Guidelines
For Layer 2 EtherChannels, you do not have to create a port-channel interface first by using the interface port-channel global configuration command before assigning a physical port to a channel group. Instead, you can use the channel-group interface configuration command. It automatically creates the port-channel interface when the channel group gets its first physical port if the logical interface is not already created. If you create the port-channel interface first, the channel-group-number can be the same as the port-channel-number, or you can use a new number. If you use a new number, the channel-group command dynamically creates a new port channel.
If the port is a UNI or an ENI, you must use the no shutdown interface configuration command to enable it before using the channel-group command. UNIs and ENIs are disabled by default. NNIs are enabled by default.
After you configure an EtherChannel, configuration changes that you make on the port-channel interface apply to all the physical ports assigned to the port-channel interface. Configuration changes applied to the physical port affect only the port where you apply the configuration. To change the parameters of all ports in an EtherChannel, apply configuration commands to the port-channel interface, for example, spanning-tree commands or commands to configure a Layer 2 EtherChannel as a trunk.
If you do not specify non-silent with the auto or desirable mode, silent is assumed. The silent mode is used when the switch is connected to a device that is not PAgP-capable and seldom, if ever, sends packets. A example of a silent partner is a file server or a packet analyzer that is not generating traffic. In this case, running PAgP on a physical port prevents that port from ever becoming operational. However, it allows PAgP to operate, to attach the port to a channel group, and to use the port for transmission. Both ends of the link cannot be set to silent.
In the on mode, an EtherChannel exists only when a port group in the on mode is connected to another port group in the on mode.
Caution
Do not configure an EtherChannel in both the PAgP and LACP modes. EtherChannel groups running PAgP and LACP can coexist on the same switch. Individual EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.
Note
If you set the protocol by using the channel-protocol interface configuration command, the setting is not overridden by the channel-group interface configuration command.
Do not configure a port that is an active or a not-yet-active member of an EtherChannel as an IEEE 802.1x port. If you try to enable IEEE 802.1x on an EtherChannel port, an error message appears, and IEEE 802.1x is not enabled.
Do not configure a secure port as part of an EtherChannel or an EtherChannel port as a secure port.
For a complete list of configuration guidelines, see the "Configuring EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to configure an EtherChannel. It assigns two static-access ports in VLAN 10 to channel 5 with the PAgP mode desirable:
Switch# configure terminalSwitch(config)# interface range gigabitethernet0/1 -2Switch(config-if-range)# switchport mode accessSwitch(config-if-range)# switchport access vlan 10Switch(config-if-range)# channel-group 5 mode desirableSwitch(config-if-range)# endThis example shows how to configure an EtherChannel. It assigns two static-access ports in VLAN 10 to channel 5 with the LACP mode active:
Switch# configure terminalSwitch(config)# interface range gigabitethernet0/1 -2Switch(config-if-range)# switchport mode accessSwitch(config-if-range)# switchport access vlan 10Switch(config-if-range)# channel-group 5 mode activeSwitch(config-if-range)# endYou can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
Restricts the protocol used on a port to manage channeling.
Accesses or creates the port channel.
Displays EtherChannel information for a channel.
Displays LACP channel-group information.
Displays PAgP channel-group information.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
channel-protocol
Use the channel-protocol interface configuration command to restrict the protocol used on a port to manage channeling. Use the no form of this command to return to the default setting.
channel-protocol {lacp | pagp}
no channel-protocol
Syntax Description
lacp
Configure an EtherChannel with the Link Aggregation Control Protocol (LACP).
pagp
Configure an EtherChannel with the Port Aggregation Protocol (PAgP).
Defaults
No protocol is assigned to the EtherChannel.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use the channel-protocol command only to restrict a channel to LACP or PAgP. If you set the protocol by using the channel-protocol command, the setting is not overridden by the channel-group interface configuration command.
Note
If the port is a user network interface (UNI) or an ENI, you must use the no shutdown interface configuration command to enable it before using the channel-protocol command. UNIs and ENIs are disabled by default. NNIs are enabled by default.
You must use the channel-group interface configuration command to configure the EtherChannel parameters. The channel-group command also can set the mode for the EtherChannel.
You cannot enable both the PAgP and LACP modes on an EtherChannel group.
PAgP and LACP are not compatible; both ends of a channel must use the same protocol.
Examples
This example shows how to specify LACP as the protocol that manages the EtherChannel:
Switch(config-if)# channel-protocol lacpYou can verify your settings by entering the show etherchannel [channel-group-number] protocol privileged EXEC command.
Related Commands
Assigns an Ethernet port to an EtherChannel group.
show etherchannel protocol
Displays protocol information the EtherChannel.
class
Use the class policy-map configuration command to specify the name of the class whose policy you want to create or to change or to specify the system default class before you configure a policy and to enter policy-map class configuration mode. Use the no form of this command to remove the class from a policy map.
class {class-map-name| class-default}
no class {class-map-name| class-default}
Syntax Description
Defaults
No policy map classes are defined.
Command Modes
Policy-map configuration
Command History
Usage Guidelines
Before using the class class-map-name command in policy-map configuration mode, you must create the class by using the class-map class-map-name global configuration command. The class class-default is the class to which traffic is directed if that traffic does not match any of the match criteria in the configured class maps.
Use the policy-map global configuration command to identify the policy map and to enter policy-map configuration mode. After specifying a policy map, you can configure a policy for new classes or modify a policy for any existing classes in that policy map.
An input policy map can have a maximum of 64 classes, plus class-default.
You attach the policy map to a port by using the service-policy interface configuration command.
After entering the class command, you enter policy-map class configuration mode, and these configuration commands are available:
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To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.
Examples
This example shows how to create a policy map called policy1, define a class class1, and enter policy-map class configuration mode to set a criterion for the class.
Switch(config)# policy-map policy1Switch(config-pmap)# class class1Switch(config-pmap-c)# set dscp 10Switch(config-pmap-c)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Creates or modifies a policy map that can be attached to multiple ports to specify a service policy.
Displays QoS policy maps.
show policy-map interface [interface-id]
Displays policy maps configured on the specified interface or on all interfaces.
class-map
Use the class-map global configuration command to create a class map to be used for matching packets to a specified criteria and to enter class-map configuration mode. Use the no form of this command to delete an existing class map.
class-map [match-all | match-any] class-map-name
no class-map [match-all | match-any] class-map-name
Syntax Description
Defaults
No class maps are defined.
If neither the match-all or the match-any keyword is specified, the default is match-all.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to specify the name of the class for which you want to create or to modify class-map match criteria and to enter class-map configuration mode.
The switch supports a maximum of 1024 unique class maps.
You use the class-map command and class-map configuration mode to define packet classification as part of a globally named service policy applied on a per-port basis. When you configure a class map, you can use one or more match commands to specify match criteria. Packets arriving at either the input or output interface (determined by how you configure the service-policy interface configuration command) are checked against the class-map match criteria to determine if the packet belongs to that class.
A match-all class map means that the packet must match all entries and can have no other match statements.
After you are in class-map configuration mode, these configuration commands are available:
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Examples
This example shows how to configure the class map called class1. By default, the class map is match-all and therefore can contain no other match criteria.
Switch(config)# class-map class1Switch(config-cmap)# exitThis example shows how to configure a match-any class map with one match criterion, which is an access list called 103. This class map (matching an ACL) is supported only in an input policy map.
Switch(config)# class-map class2Switch(config-cmap)# match access-group 103Switch(config-cmap)# exitThis example shows how to delete the class map class1:
Switch(config)# no class-map class1You can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
clear ip arp inspection log
Use the clear ip arp inspection log privileged EXEC command to clear the dynamic Address Resolution Protocol (ARP) inspection log buffer.
clear ip arp inspection log
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear the contents of the log buffer:
Switch# clear ip arp inspection logYou can verify that the log was cleared by entering the show ip arp inspection log privileged command.
Related Commands
clear ip arp inspection statistics
Use the clear ip arp inspection statistics privileged EXEC command to clear the dynamic Address Resolution Protocol (ARP) inspection statistics.
clear ip arp inspection statistics [vlan vlan-range]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear the statistics for VLAN 1:
Switch# clear ip arp inspection statistics vlan 1You can verify that the statistics were deleted by entering the show ip arp inspection statistics vlan 1 privileged EXEC command.
Related Commands
show ip arp inspection statistics
Displays statistics for forwarded, dropped, MAC validation failure, and IP validation failure packets for all VLANs or the specified VLAN.
clear ip dhcp snooping
Use the clear ip dhcp snooping privileged EXEC command to clear the DHCP binding database agent statistics or the DHCP snooping statistics counters.
clear ip dhcp snooping {binding {* | ip-address | interface interface-id | vlan vlan-id} | database statistics | statistics}
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
When you enter the clear ip dhcp snooping database statistics command, the switch does not update the entries in the binding database and in the binding file before clearing the statistics.
Examples
This example shows how to clear the DHCP snooping binding database agent statistics:
Switch# clear ip dhcp snooping database statisticsYou can verify that the statistics were cleared by entering the show ip dhcp snooping database privileged EXEC command.
This example shows how to clear the DHCP snooping statistics counters:
Switch# clear ip dhcp snooping statisticsYou can verify that the statistics were cleared by entering the show ip dhcp snooping statistics user EXEC command.
Related Commands
clear lacp
Use the clear lacp privileged EXEC command to clear Link Aggregation Control Protocol (LACP) channel-group counters.
clear lacp {channel-group-number counters | counters}
Note
Syntax Description
channel-group-number
(Optional) Channel group number. The range is 1 to 48.
counters
Clear traffic counters.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can clear all counters by using the clear lacp counters command, or you can clear only the counters for the specified channel group by using the clear lacp channel-group-number counters command.
Examples
This example shows how to clear all channel-group information:
Switch# clear lacp countersThis example shows how to clear LACP traffic counters for group 4:
Switch# clear lacp 4 countersYou can verify that the information was deleted by entering the show lacp counters or the show lacp 4 counters privileged EXEC command.
Related Commands
clear mac address-table
Use the clear mac address-table privileged EXEC command to delete from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN. This command also clears the MAC address notification global counters.
clear mac address-table {dynamic [address mac-addr | interface interface-id | vlan vlan-id] | notification}
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to remove a specific MAC address from the dynamic address table:
Switch# clear mac address-table dynamic address 0008.0070.0007You can verify that the information was deleted by entering the show mac address-table privileged EXEC command.
Related Commands
clear pagp
Use the clear pagp privileged EXEC command to clear Port Aggregation Protocol (PAgP) channel-group information.
clear pagp {channel-group-number counters | counters}
Note
Syntax Description
channel-group-number
(Optional) Channel group number. The range is 1 to 48.
counters
Clear traffic counters.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can clear all counters by using the clear pagp counters command, or you can clear only the counters for the specified channel group by using the clear pagp channel-group-number counters command.
Examples
This example shows how to clear all channel-group information:
Switch# clear pagp countersThis example shows how to clear PAgP traffic counters for group 10:
Switch# clear pagp 10 countersYou can verify that information was deleted by entering the show pagp privileged EXEC command.
Related Commands
clear policer cpu uni-eni counters
Use the clear policer cpu uni-eni counters privileged EXEC command to clear control-plane policer statistics. The control-plane policer drops or rate-limits control packets from user network interfaces (UNIs) and enhanced network interfaces (ENIs) to protect the CPU from overload.
clear policer cpu uni-eni counters {classification | drop}
Syntax Description
classification
Clear control-plane policer classification counters that maintain statistics by feature.
drop
Clear all frame drop statistics maintained by the control-plane policer.
Command Default
No default is defined.
Command Modes
User EXEC
Command History
12.2(25)EX
This command was introduced.
12.2(44)SE
The uni keyword was changed to uni-eni.
Usage Guidelines
You can use this command to clear statistics maintained per feature or statistics about dropped frames.
You can enter the show platform policer cpu classification or show policer cpu uni drop command to view feature statistics or dropped frames before and after you use the clear command.
Related Commands
show platform policer cpu classification
Displays CPU policer statistics per feature.
Displays CPU policer information for the switch.
clear port-security
Use the clear port-security privileged EXEC command to delete from the MAC address table all secure addresses or all secure addresses of a specific type (configured, dynamic, or sticky) on the switch or on an interface.
clear port-security {all | configured | dynamic | sticky} [[address mac-addr | interface interface-id] [vlan {vlan-id | {access | voice}}]]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear all secure addresses from the MAC address table:
Switch# clear port-security allThis example shows how to remove a specific configured secure address from the MAC address table:
Switch# clear port-security configured address 0008.0070.0007This example shows how to remove all the dynamic secure addresses learned on a specific interface:
Switch# clear port-security dynamic interface gigabitethernet0/1This example shows how to remove all the dynamic secure addresses from the address table:
Switch# clear port-security dynamicYou can verify that the information was deleted by entering the show port-security privileged EXEC command.
Related Commands
Enables port security on an interface.
switchport port-security mac-address mac-address
Configures secure MAC addresses.
switchport port-security maximum value
Configures a maximum number of secure MAC addresses on a secure interface.
Displays the port security settings defined for an interface or for the switch.
clear spanning-tree counters
Use the clear spanning-tree counters privileged EXEC command to clear the spanning-tree counters.
clear spanning-tree counters [interface interface-id]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If the interface-id is not specified, spanning-tree counters are cleared for all STP ports.
Examples
This example shows how to clear spanning-tree counters for all STP ports:
Switch# clear spanning-tree countersRelated Commands
clear spanning-tree detected-protocols
Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all spanning-tree interfaces or on the specified interface.
clear spanning-tree detected-protocols [interface interface-id]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
A switch running the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol or the Multiple Spanning Tree Protocol (MSTP) supports a built-in protocol migration mechanism that enables it to interoperate with legacy IEEE 802.1D switches. If a rapid-PVST+ switch or an MSTP switch receives a legacy IEEE 802.1D configuration bridge protocol data unit (BPDU) with the protocol version set to 0, it sends only IEEE 802.1D BPDUs on that port. A multiple spanning-tree (MST) switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (Version 3) associated with a different region, or a rapid spanning-tree (RST) BPDU (Version 2).
However, the switch does not automatically revert to the rapid-PVST+ or the MSTP mode if it no longer receives IEEE 802.1D BPDUs. It cannot learn whether the legacy switch has been removed from the link unless the legacy switch is the designated switch. Use the clear spanning-tree detected-protocols command in this situation.
Examples
This example shows how to restart the protocol migration process on a port:
Switch# clear spanning-tree detected-protocols interface gigabitethernet0/1Related Commands
Displays spanning-tree state information.
Overrides the default link-type setting and enables rapid spanning-tree transitions to the forwarding state.
clear vmps statistics
Use the clear vmps statistics privileged EXEC command to clear the statistics maintained by the VLAN Query Protocol (VQP) client.
clear vmps statistics
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear VLAN Membership Policy Server (VMPS) statistics:
Switch# clear vmps statisticsYou can verify that information was deleted by entering the show vmps statistics privileged EXEC command.
Related Commands
Displays the VQP version, reconfirmation interval, retry count, VMPS IP addresses, and the current and primary servers.
conform-action
Use the conform-action policy-map class police configuration command to set multiple actions for a policy-map class for packets that conform to the committed information rate (CIR). Use the no form of this command to cancel the action or to return to the default action.
conform-action {set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]}
no conform-action {set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]}
Note
Syntax Description
Defaults
The default conform action is to send the packet.
Command Modes
Policy-map class police configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
Increased support for configuring conform-action marking. See "Usage Guidelines."
Usage Guidelines
You can configure conform-action marking by using enhanced packet marking to modify a QoS marking based on any incoming QoS marking and table maps. The switch also supports simultaneously marking multiple QoS parameters for the same class and configuring conform-action marking and exceed-action marking.
Access policy-map class police configuration mode by entering the police policy-map class command. See the police policy-map class configuration command for more information.
Use this command to set one or more conform actions for a traffic class.
Examples
This example shows how configure multiple conform actions in a policy map that sets a committed information rate of 23000 bits per second (bps) and a conform burst rate of 10000 bps. The policy map includes multiple conform actions (for DSCP and for Layer 2 CoS) and an exceed action.
Switch(config)# policy-map map1Switch(config-pmap)# class cos-set-1Switch(config-pmap-c)# police cir 23000 bc 10000Switch(config-pmap-c-police)# conform-action set-dscp-transmit 48Switch(config-pmap-c-police)# conform-action set-cos-transmit 5Switch(config-pmap-c-police)# exceed-action dropSwitch(config-pmap-c-police)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
define interface-range
Use the define interface-range global configuration command to create an interface-range macro. Use the no form of this command to delete the defined macro.
define interface-range macro-name interface-range
no define interface-range macro-name interface-range
Syntax Description
macro-name
Name of the interface-range macro; up to 32 characters.
interface-range
Interface range; for valid values for interface ranges, see "Usage Guidelines."
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
The macro name is a 32-character maximum character string.
A macro can contain up to five ranges.
All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs, but you can combine multiple interface types in a macro.
When entering the interface-range, use this format:
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Valid values for type and interface:
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VLAN interfaces must have been configured with the interface vlan command (the show running-config privileged EXEC command displays the configured VLAN interfaces). VLAN interfaces not displayed by the show running-config command cannot be used in interface-ranges.
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For physical interfaces:
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When you define a range, you must enter a space before the hyphen (-), for example:
gigabitethernet0/1 - 2
You can also enter multiple ranges. When you define multiple ranges, you must enter a space after the first entry before the comma (,). The space after the comma is optional, for example:
fastethernet0/3, gigabitethernet0/1 - 2
fastethernet0/3 -4, gigabitethernet0/1 - 2
Examples
This example shows how to create a multiple-interface macro:
Switch(config)# define interface-range macro1 fastethernet0/1 - 2, gigabitethernet0/1 - 2Related Commands
Executes a command on multiple ports at the same time.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
delete
Use the delete privileged EXEC command to delete a file or directory on the flash memory device.
delete [/force] [/recursive] filesystem:/file-url
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If you use the /force keyword, you are prompted once at the beginning of the deletion process to confirm the deletion.
If you use the /recursive keyword without the /force keyword, you are prompted to confirm the deletion of every file.
The prompting behavior depends on the setting of the file prompt global configuration command. By default, the switch prompts for confirmation on destructive file operations. For more information about this command, see the Cisco IOS Command Reference for Release 12.1.
Examples
This example shows how to remove the directory that contains the old software image after a successful download of a new image:
Switch# delete /force /recursive flash:/old-imageYou can verify that the directory was removed by entering the dir filesystem: privileged EXEC command.
Related Commands
deny (ARP access-list configuration)
Use the deny Address Resolution Protocol (ARP) access-list configuration command to deny an ARP packet based on matches against the DHCP bindings. Use the no form of this command to remove the specified access control entry (ACE) from the access list.
deny {[request] ip {any | host sender-ip | sender-ip sender-ip-mask} mac {any | host sender-mac | sender-mac sender-mac-mask} | response ip {any | host sender-ip | sender-ip sender-ip-mask} [{any | host target-ip | target-ip target-ip-mask}] mac {any | host sender-mac | sender-mac sender-mac-mask} [{any | host target-mac | target-mac target-mac-mask}]} [log]
no deny {[request] ip {any | host sender-ip | sender-ip sender-ip-mask} mac {any | host sender-mac | sender-mac sender-mac-mask} | response ip {any | host sender-ip | sender-ip sender-ip-mask} [{any | host target-ip | target-ip target-ip-mask}] mac {any | host sender-mac | sender-mac sender-mac-mask} [{any | host target-mac | target-mac target-mac-mask}]} [log]
Syntax Description
Defaults
There are no default settings. However, at the end of the ARP access list, there is an implicit deny ip any mac any command.
Command Modes
ARP access-list configuration
Command History
Usage Guidelines
You can add deny clauses to drop ARP packets based on matching criteria.
Examples
This example shows how to define an ARP access list and to deny both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd:
Switch(config)# arp access-list static-hostsSwitch(config-arp-nacl)# deny ip host 1.1.1.1 mac host 0000.0000.abcdSwitch(config-arp-nacl)# endYou can verify your settings by entering the show arp access-list privileged EXEC command.
Related Commands
deny (MAC access-list configuration)
Use the deny MAC access-list configuration command to prevent non-IP traffic from being forwarded if the conditions are matched. Use the no form of this command to remove a deny condition from the named MAC access list.
{deny | permit} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | aarp | amber | cos cos | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask |mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]
no {deny | permit} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | aarp | amber | cos cos | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]
Syntax Description
Note
To filter IPX traffic, you use the type mask or lsap lsap mask keywords, depending on the type of IPX encapsulation being used. Filter criteria for IPX encapsulation types as specified in Novell terminology and Cisco IOS terminology are listed in Table 2-1.
Defaults
This command has no defaults. However; the default action for a MAC-named ACL is to deny.
Command Modes
MAC-access list configuration
Command History
Usage Guidelines
You enter MAC-access list configuration mode by using the mac access-list extended global configuration command.
If you use the host keyword, you cannot enter an address mask; if you do not use the host keyword, you must enter an address mask.
When an access control entry (ACE) is added to an access control list, an implied deny-any-any condition exists at the end of the list. That is, if there are no matches, the packets are denied. However, before the first ACE is added, the list permits all packets.
Note
Examples
This example shows how to define the named MAC extended access list to deny NETBIOS traffic from any source to MAC address 00c0.00a0.03fa. Traffic matching this list is denied.
Switch(config-ext-macl)# deny any host 00c0.00a0.03fa netbios.This example shows how to remove the deny condition from the named MAC extended access list:
Switch(config-ext-macl)# no deny any 00c0.00a0.03fa 0000.0000.0000 netbios.This example denies all packets with Ethertype 0x4321:
Switch(config-ext-macl)# deny any any 0x4321 0You can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
dot1x default
Use the dot1x default interface configuration command to reset the configurable IEEE 802.1x parameters to their default values.
dot1x default
Syntax Description
This command has no arguments or keywords.
Defaults
These are the default values:
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Command Modes
Interface configuration
Command History
Examples
This example shows how to reset the configurable IEEE 802.1x parameters on a port:
Switch(config-if)# dot1x defaultYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x host-mode
Use the dot1x host-mode interface configuration command to allow a single host (client) or multiple hosts on an IEEE 802.1x-authorized port that has the dot1x port-control interface configuration command set to auto. Use the no form of this command to return to the default setting.
dot1x host-mode {multi-host | single-host}
no dot1x host-mode [multi-host | single-host]
Note
Syntax Description
multi-host
Enable multiple-hosts mode on the switch.
single-host
Enable single-host mode on the switch.
Defaults
The default is single-host mode.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command to limit an IEEE 802.1x-enabled port to a single client or to attach multiple clients to an IEEE 802.1x-enabled port. In multiple-hosts mode, only one of the attached hosts must be successfully authorized for all hosts to be granted network access. If the port becomes unauthorized (re-authentication fails or an Extensible Authentication Protocol over LAN [EAPOL]-logoff message is received), all attached clients are denied access to the network.
Before entering this command, make sure that the dot1x port-control interface configuration command is set to auto for the specified port.
The dot1x host-mode multi-domain interface configuration command is not supported on the switch. Configuring this command on an interface causes the interface to go into the error-disabled state.
Examples
This example shows how to enable IEEE 802.1x globally, to enable IEEE 802.1x on a port, and to enable multiple-hosts mode:
Switch(config)# dot1x system-auth-controlSwitch(config)# interface gigabitethernet0/1Switch(config-if)# dot1x port-control autoSwitch(config-if)# dot1x host-mode multi-hostYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x initialize
Use the dot1x initialize privileged EXEC command to manually return the specified IEEE 802.1x-enabled port to an unauthorized state before initiating a new authentication session on the port.
dot1x initialize interface interface-id
Syntax Description
Defaults
There is no default setting.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use this command to initialize the IEEE 802.1x state machines and to set up a fresh environment for authentication. After you enter this command, the port status becomes unauthorized.
There is no no form of this command.
Examples
This example shows how to manually initialize a port:
Switch# dot1x initialize interface gigabitethernet0/2You can verify the unauthorized port status by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x max-reauth-req
Use the dot1x max-reauth-req interface configuration command to set the maximum number of times that the switch restarts the authentication process before a port transitions to the unauthorized state. Use the no form of this command to return to the default setting.
dot1x max-reauth-req count
no dot1x max-reauth-req
Syntax Description
count
Number of times that the switch restarts the authentication process before the port transitions to the unauthorized state. The range is 1 to 10.
Defaults
The default is 2 times.
Command Modes
Interface configuration
Command History
Usage Guidelines
You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.
Examples
This example shows how to set 4 as the number of times that the switch restarts the authentication process before the port transitions to the unauthorized state:
Switch(config-if)# dot1x max-reauth-req 4You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
Sets the maximum number of times that the switch forwards an EAP frame (assuming that no response is received) to the authentication server before restarting the authentication process.
dot1x timeout tx-period
Sets the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before resending the request.
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x max-req
Use the dot1x max-req interface configuration command to set the maximum number of times that the switch sends an Extensible Authentication Protocol (EAP) frame from the authentication server (assuming that no response is received) to the client before restarting the authentication process. Use the no form of this command to return to the default setting.
dot1x max-req count
no dot1x max-req
Syntax Description
count
Number of times that the switch resends an EAP frame from the authentication server before restarting the authentication process. The range is 1 to 10.
Defaults
The default is 2 times.
Command Modes
Interface configuration
Command History
Usage Guidelines
You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.
Examples
This example shows how to set 5 as the number of times that the switch sends an EAP frame from the authentication server before restarting the authentication process:
Switch(config-if)# dot1x max-req 5You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
dot1x timeout tx-period
Sets the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before resending the request.
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x port-control
Use the dot1x port-control interface configuration command to enable manual control of the authorization state of the port. Use the no form of this command to return to the default setting.
dot1x port-control {auto | force-authorized | force-unauthorized}
no dot1x port-control
Syntax Description
Defaults
The default is force-authorized.
Command Modes
Interface configuration
Command History
Usage Guidelines
You must globally enable IEEE 802.1x on the switch by using the dot1x system-auth-control global configuration command before enabling IEEE 802.1x on a specific port.
You can use the auto keyword only if the port is not configured as one of these:
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To globally disable IEEE 802.1x on the switch, use the no dot1x system-auth-control global configuration command. To disable IEEE 802.1x on a specific port, use the no dot1x port-control interface configuration command.
Examples
This example shows how to enable IEEE 802.1x on a port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# dot1x port-control autoYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x re-authenticate
Use the dot1x re-authenticate privileged EXEC command to manually initiate a re-authentication of the specified IEEE 802.1x-enabled port.
dot1x re-authenticate interface interface-id
Syntax Description
Defaults
There is no default setting.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can use this command to re-authenticate a client without waiting for the configured number of seconds between re-authentication attempts (re-authperiod) and automatic re-authentication.
Examples
This example shows how to manually re-authenticate the device connected to a port:
Switch# dot1x re-authenticate interface gigabitethernet0/1dot1x reauthentication
Use the dot1x reauthentication interface configuration command to enable periodic re-authentication of the client. Use the no form of this command to return to the default setting.
dot1x reauthentication
no dot1x reauthentication
Syntax Description
This command has no arguments or keywords.
Defaults
Periodic re-authentication is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
You configure the amount of time between periodic re-authentication attempts by using the dot1x timeout reauth-period interface configuration command.
Examples
This example shows how to disable periodic re-authentication of the client:
Switch(config-if)# no dot1x reauthenticationThis example shows how to enable periodic re-authentication and to set the number of seconds between re-authentication attempts to 4000 seconds:
Switch(config-if)# dot1x reauthenticationSwitch(config-if)# dot1x timeout reauth-period 4000You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
dot1x timeout reauth-period
Sets the number of seconds between re-authentication attempts.
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x system-auth-control
Use the dot1x system-auth-control global configuration command to globally enable IEEE 802.1x. Use the no form of this command to return to the default setting.
dot1x system-auth-control
no dot1x system-auth-control
Syntax Description
This command has no arguments or keywords.
Defaults
IEEE 802.1x is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
You must enable authentication, authorization, and accounting (AAA) and specify the authentication method list before globally enabling IEEE 802.1x. A method list describes the sequence and authentication methods to be queried to authenticate a user.
Before globally enabling IEEE 802.1x on a switch, remove the EtherChannel configuration from the interfaces on which IEEE 802.1x and EtherChannel are configured.
Examples
This example shows how to globally enable IEEE 802.1x on a switch:
Switch(config)# dot1x system-auth-controlYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
Enables manual control of the authorization state of the port.
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
dot1x test eapol-capable
Use the dot1x test eapol-capable privileged EXEC command to monitor IEEE 802.1x activity on all the switch ports and to display information about the devices that are connected to the ports that support IEEE 802.1x.
dot1x test eapol-capable [interface interface-id]
Syntax Description
Defaults
There is no default setting.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use this command to test the IEEE 802.1x capability of the devices connected to all ports or to specific ports on a switch.
There is not a no form of this command.
Examples
This example shows how to enable the IEEE 802.1x readiness check on a switch to query a port. It also shows the response received from the queried port verifying that the device connected to it is IEEE 802.1x-capable:
switch# dot1x test eapol-capable interface gigabitethernet1/0/13DOT1X_PORT_EAPOL_CAPABLE:DOT1X: MAC 00-01-02-4b-f1-a3 on gigabitethernet1/0/13 is EAPOL capableRelated Commands
dot1x test timeout timeout
Configures the timeout used to wait for EAPOL response to an IEEE 802.1x readiness query.
dot1x test timeout
Use the dot1x test timeout global configuration command to configure the timeout used to wait for EAPOL response from a port being queried for IEEE 802.1x readiness.
dot1x test timeout timeout
Syntax Description
Defaults
The default setting is 10 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to configure the timeout used to wait for EAPOL response.
There is not a no form of this command.
Examples
This example shows how to configure the switch to wait 27 seconds for an EAPOL response:
Switch# dot1x test timeout 27You can verify the timeout configuration status by entering the show run privileged EXEC command.
Related Commands
dot1x test eapol-capable [interface interface-id]
Checks for IEEE 802.1x readiness on devices connected to all or to specified IEEE 802.1x-capable ports.
dot1x timeout
Use the dot1x timeout interface configuration command to set IEEE 802.1x timers. Use the no form of this command to return to the default setting.
dot1x timeout {quiet-period seconds | reauth-period seconds | server-timeout seconds | supp-timeout seconds | tx-period seconds}
no dot1x timeout {quiet-period | reauth-period | server-timeout | supp-timeout | tx-period}
Syntax Description
Defaults
These are the default settings:
reauth-period is 3600 seconds.
quiet-period is 60 seconds.
tx-period is 30 seconds.
supp-timeout is 30 seconds.
server-timeout is 30 seconds.
Command Modes
Interface configuration
Command History
12.2(25)EX
This command was introduced.
12.2(40)SE
The range for tx-period seconds is incorrect. The correct range is from 1 to 65535.
Usage Guidelines
You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.
The dot1x timeout reauth-period interface configuration command affects the behavior of the switch only if you have enabled periodic re-authentication by using the dot1x reauthentication interface configuration command.
During the quiet period, the switch does not accept or initiate any authentication requests. If you want to provide a faster response time to the user, enter a number smaller than the default.
Examples
This example shows how to enable periodic re-authentication and to set 4000 as the number of seconds between re-authentication attempts:
Switch(config-if)# dot1x reauthenticationSwitch(config-if)# dot1x timeout reauth-period 4000This example shows how to set 30 seconds as the quiet time on the switch:
Switch(config-if)# dot1x timeout quiet-period 30This example shows how to set 45 seconds as the switch-to-authentication server retransmission time:
Switch(config)# dot1x timeout server-timeout 45This example shows how to set 45 seconds as the switch-to-client retransmission time for the EAP request frame:
Switch(config-if)# dot1x timeout supp-timeout 45This example shows how to set 60 as the number of seconds to wait for a response to an EAP-request/identity frame from the client before re-transmitting the request:
Switch(config-if)# dot1x timeout tx-period 60You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
dot1x violation-mode
Use the dot1x violation-mode interface configuration command to configure the violation modes that occur when a new device connects to a port or when a new device connects to a port after the maximum number of devices are connected to that port.
dot1x violation-mode {shutdown | restrict | protect}
no dot1x violation-mode
Syntax Description
Defaults
By default dot1x violation-mode protect is enabled.
Command Modes
Interface configuration
Command History
Examples
This example shows how to configure an IEEE 802.1x-enabled port as error disabled and to shut down when a new device connects to the port:
Switch(config-if)# dot1x violation-mode shutdownThis example shows how to configure an IEEE 802.1x-enabled port to generate a system error message and change the port to restricted mode when a new device connects to the port:
Switch(config-if)# dot1x violation-mode restrictThis example shows how to configure an IEEE 802.1x-enabled port to ignore a new connected device when it is connected to the port:
Switch(config-if)# dot1x violation-mode protectYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
show dot1x [interface interface-id]
Displays IEEE 802.1x status for the specified port.
duplex
Use the duplex interface configuration command to specify the duplex mode of operation for a port. Use the no form of this command to return the port to its default value.
duplex {auto | full | half}
no duplex
Syntax Description
Defaults
The default is auto for Fast Ethernet and Gigabit Ethernet ports and for 1000BASE-T small form-factor pluggable (SFP) modules.
The default is half for 100BASE-FX MMF SFP modules.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is only available when a 1000BASE-T SFP module or a 100BASE-FX MMF SFP module is in the SFP module slot. All other SFP modules operate only in full-duplex mode.
When a 1000BASE-T SFP module is in the SFP module slot, you can configure duplex mode to auto or full.
When a 100BASE-FX MMF SFP module is in the SFP module slot, you can configure duplex mode to half or full. Although the auto keyword is available, it puts the interface in half-duplex mode (the default) because the 100BASE-FX MMF SFP module does not support autonegotiation.
Certain ports can be configured to be either full duplex or half duplex. Applicability of this command depends on the device to which the switch is attached.
For Fast Ethernet ports, setting the port to auto has the same effect as specifying half if the attached device does not autonegotiate the duplex parameter.
For Gigabit Ethernet ports, setting the port to auto has the same effect as specifying full if the attached device does not autonegotiate the duplex parameter.
Note
If both ends of the line support autonegotiation, we highly recommend using the default autonegotiation settings. If one interface supports autonegotiation and the other end does not, configure duplex and speed on both interfaces; do use the auto setting on the supported side.
If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed setting and then forces the speed setting to the negotiated value. The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch.
You can configure the duplex setting when the speed is set to auto.
Caution
Note
Examples
This example shows how to configure an interface for full duplex operation:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# duplex fullYou can verify your setting by entering the show interfaces privileged EXEC command.
Related Commands
Displays the interface settings on the switch.
Sets the speed on a 10/100 or 10/100/1000 Mbps interface.
errdisable detect cause
Use the errdisable detect cause global configuration command to enable error-disabled detection for a specific cause or all causes. Use the no form of this command to disable the error-disabled detection feature.
errdisable detect cause {all | dhcp-rate-limit | gbic-invalid | link-flap | loopback | pagp-flap | small-frame}
no errdisable detect cause {all | dhcp-rate-limit | gbic-invalid | link-flap | pagp-flap | small-frame}
Note
Syntax Description
all
Enable error detection for all error-disable causes.
dhcp-rate-limit
Enable error detection for DHCP snooping.
gbic-invalid
Enable error detection for an invalid Gigabit Interface Converter (GBIC) module.
Note
link-flap
Enable error detection for link-state flapping.
loopback
Enable error detection for detected loopbacks.
pagp-flap
Enable error detection for the Port Aggregation Protocol (PAgP) flap error-disabled cause.
small-frame
See the errdisable detect cause small-frame command.
Defaults
Detection is enabled for all causes. All causes, except for per-VLAN error disabling, are configured to shut down the entire port.
Command Modes
Global configuration
Command History
Usage Guidelines
A cause (all, dhcp-rate-limit, and so forth) is the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in an error-disabled state, an operational state that is similar to a link-down state.
When a port is error-disabled, it is effectively shut down, and no traffic is sent or received on the port. For the BPDU guard and port-security features, you can configure the switch to shut down just the offending VLAN on the port when a violation occurs, instead of shutting down the entire port.
If you set a recovery mechanism for the cause by entering the errdisable recovery global configuration command for the cause, the interface is brought out of the error-disabled state and allowed to retry the operation when all causes have timed out. If you do not set a recovery mechanism, you must enter the shutdown and then the no shutdown commands to manually recover an interface from the error-disabled state.
Examples
This example shows how to enable error-disabled detection for the link-flap error-disabled cause:
Switch(config)# errdisable detect cause link-flapYou can verify your setting by entering the show errdisable detect privileged EXEC command.
Related Commands
Displays errdisable detection information.
show interfaces status err-disabled
Displays interface status or a list of interfaces in the error-disabled state.
errdisable detect cause small-frame
Use the errdisable detect cause small-frame global configuration command to allow any switch port to be error disabled if incoming VLAN-tagged packets are small frames (67 bytes or less) and arrive at the minimum configured rate (the threshold). Use the no form of this command to return to the default setting.
errdisable detect cause small-frame
no errdisable detect cause small-frame
Syntax Description
This command has no arguments or keywords.
Defaults
This feature is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
This command globally enables the small-frame arrival feature. Use the small violation-rate interface configuration command to set the threshold for each port.
You can configure the port to be automatically re-enabled by using the errdisable recovery cause small-frame global configuration command. You configure the recovery time by using the errdisable recovery interval interval global configuration command.
Examples
This example shows how to enable the switch ports to be put into the error-disabled mode if incoming small frames arrive at the configured threshold:
Switch(config)# errdisable detect cause small-frameYou can verify your setting by entering the show interfaces privileged EXEC command.
Related Commands
Enables the recovery timer.
errdisable recovery interval interval
Specifies the time to recover from the specified error-disabled state.
Displays the interface settings on the switch, including input and output flow control.
Configures the rate (threshold) for incoming small frames to cause a port to be put into the error-disabled state.
errdisable recovery
Use the errdisable recovery global configuration command to configure the recover mechanism variables. Use the no form of this command to return to the default setting.
errdisable recovery {cause {all | bpduguard | channel-misconfig | dhcp-rate-limit | gbic-invalid | link-flap | loopback | pagp-flap | psecure-violation | security-violation | small-frame | udld |unicast-flood | vmps} | {interval interval}
no errdisable recovery {cause {all | bpduguard | channel-misconfig | dhcp-rate-limit | gbic-invalid | link-flap | loopback | pagp-flap | psecure-violation | security-violation | small-frame | udld |unicast-flood | vmps} | {interval interval}
Note
Syntax Description
cause
Enable the error-disabled mechanism to recover from a specific cause.
all
Enable the timer to recover from all error-disabled causes.
bpduguard
Enable the timer to recover from the bridge protocol data unit (BPDU) guard error-disabled state.
channel-misconfig
Enable the timer to recover from the EtherChannel misconfiguration error-disabled state.
dhcp-rate-limit
Enable the timer to recover from the DHCP snooping error-disabled state.
gbic-invalid
Enable the timer to recover from an invalid Gigabit Interface Converter (GBIC) module error-disabled state.
Note
link-flap
Enable the timer to recover from the link-flap error-disabled state.
loopback
Enable the timer to recover from a loopback error-disabled state.
pagp-flap
Enable the timer to recover from the Port Aggregation Protocol (PAgP)-flap error-disabled state.
psecure-violation
Enable the timer to recover from a port security violation disabled state.
security-violation
Enable the timer to recover from an IEEE 802.1x-violation disabled state.
small-frame
See the errdisable recovery cause small-frame command.
udld
Enable the timer to recover from the UniDirectional Link Detection (UDLD) error-disabled state.
unicast-flood
Enable the timer to recover from the unicast flood disable state.
vmps
Enable the timer to recover from the VLAN Membership Policy Server (VMPS) error-disabled state.
interval interval
Specify the time to recover from the specified error-disabled state. The range is 30 to 86400 seconds. The same interval is applied to all causes. The default interval is 300 seconds.
Note
Defaults
Recovery is disabled for all causes.
The default recovery interval is 300 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
A cause (all, bpduguard and so forth) is defined as the reason that the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state. If you do not enable errdisable recovery for the cause, the interface stays in error-disabled state until you enter a shutdown and no shutdown interface configuration command. If you enable the recovery for a cause, the interface is brought out of the error-disabled state and allowed to retry the operation again when all the causes have timed out.
Otherwise, you must enter the shutdown then no shutdown commands to manually recover an interface from the error-disabled state
Examples
This example shows how to enable the recovery timer for the BPDU guard error-disabled cause:
Switch(config)# errdisable recovery cause bpduguardThis example shows how to set the timer to 500 seconds:
Switch(config)# errdisable recovery interval 500You can verify your settings by entering the show errdisable recovery privileged EXEC command.
Related Commands
Displays errdisable recovery timer information.
show interfaces status err-disabled
Displays interface status or a list of interfaces in error-disabled state.
Configures the size for an incoming (small) frame to cause a port to be put into the error-disabled state.
errdisable recovery cause small-frame
Use the errdisable recovery cause small-frame global configuration command to enable the recovery timer for ports to be automatically re-enabled after they are error disabled by the arrival of small frames. Use the no form of this command to return to the default setting.
errdisable recovery cause small-frame
no errdisable recovery cause small-frame
Syntax Description
This command has no arguments or keywords.
Defaults
This feature is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
This command enables the recovery timer for error-disabled ports. You configure the recovery time by using the errdisable recovery interval interval interface configuration command.
Examples
This example shows how to set the recovery timer:
Switch(config)# errdisable recovery cause small-frameYou can verify your setting by entering the show interfaces user EXEC command.
Related Commands
exceed-action
Use the exceed-action policy-map class police configuration command to set multiple actions for a policy-map class for packets that do not conform to the committed information rate (CIR). Use the no form of this command to cancel the action or to return to the default action.
exceed-action {drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]}
no exceed-action {drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]}
Syntax Description
Defaults
The default action is to drop the packet.
Command Modes
Policy-map class police configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
Increased support for configuring exceed actions. See "Usage Guidelines."
Usage Guidelines
You can configure exceed-action to send the packet unmodified, mark using explicit values, and use all combinations of enhanced packet marking. Enhanced packet marking provides the ability to modify a QoS marking based on any incoming QoS marking and table maps. The switch also supports the ability to mark multiple QoS parameters for the same class, and to simultaneously configure conform-action marking and exceed-action marking.
Access policy-map class police configuration mode by entering the police policy-map class command. See the police command for more information.
You can use this command to set one or more exceed actions for a traffic class.
Examples
This example shows how configure multiple actions in a policy map that sets an information rate of 23000 bits per second (b/s) and a burst rate of 10000 bps:
Switch(config)# policy-map map1Switch(config-pmap)# class class1Switch(config-pmap-c)# police 23000 10000Switch(config-pmap-c-police)# conform-action transmitSwitch(config-pmap-c-police)# exceed-action set-prec-transmit prec table policed-prec-table-map-nameSwitch(config-pmap-c-police)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
flowcontrol
Use the flowcontrol interface configuration command to set the receive flow-control state for an interface. When flow control send is operable and on for a device and it detects any congestion at its end, it notifies the link partner or the remote device of the congestion by sending a pause frame. When flow control receive is on for a device and it receives a pause frame, it stops sending any data packets. This prevents any loss of data packets during the congestion period.
Use the receive off keywords to disable flow control.
flowcontrol receive {desired | off | on}
Note
Syntax Description
Defaults
The default is flowcontrol receive off.
Command Modes
Interface configuration
Command History
Usage Guidelines
The switch does not support sending flow-control pause frames. If the port is a user network interface (UNI) or enhanced network interface (ENI), you must use the no shutdown interface configuration command to enable it before using the flowcontrol command. UNIs and ENIs are disabled by default. Network node interfaces (NNIs) are enabled by default.
Note that the on and desired keywords have the same result.
When you use the flowcontrol command to set a port to control traffic rates during congestion, you are setting flow control on a port to one of these conditions:
•
•
Table 2-2 shows the flow control results on local and remote ports for a combination of settings. The table assumes that receive desired has the same results as using the receive on keywords.
Examples
This example shows how to configure the local port to not support flow control by the remote port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# flowcontrol receive offYou can verify your settings by entering the show interfaces privileged EXEC command.
Related Commands
Displays the interface settings on the switch, including input and output flow control.
interface port-channel
Use the interface port-channel global configuration command to access or create the port-channel logical interface. Use the no form of this command to remove the port-channel.
interface port-channel port-channel-number
no interface port-channel port-channel-number
Syntax Description
Defaults
No port-channel logical interfaces are defined.
Command Modes
Global configuration
Command History
Usage Guidelines
For Layer 2 EtherChannels, you do not have to create a port-channel interface first before assigning a physical port to a channel group. Instead, you can use the channel-group interface configuration command. It automatically creates the port-channel interface when the channel group gets its first physical port. If you create the port-channel interface first, the channel-group-number can be the same as the port-channel-number, or you can use a new number. If you use a new number, the channel-group command dynamically creates a new port channel.
Only one port channel in a channel group is allowed.
Follow these guidelines when you use the interface port-channel command:
•
Note
•
For a complete list of configuration guidelines, see the "Configuring EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to create a port-channel interface with a port channel number of 5:
Switch(config)# interface port-channel 5You can verify your setting by entering the show running-config privileged EXEC or show etherchannel channel-group-number detail privileged EXEC command.
Related Commands
Assigns an Ethernet port to an EtherChannel group.
Displays EtherChannel information for a channel.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
interface range
Use the interface range global configuration command to enter interface range configuration mode and to execute a command on multiple ports at the same time. Use the no form of this command to remove an interface range.
interface range {port-range | macro name}
no interface range {port-range | macro name}
Syntax Description
port-range
Port range. For a list of valid values for port-range, see the "Usage Guidelines" section.
macro name
Specify the name of a macro.
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
When you enter interface range configuration mode, all interface parameters you enter are attributed to all interfaces within the range.
For VLANs, you can use the interface range command only on existing VLAN switch virtual interfaces (SVIs). To display VLAN SVIs, enter the show running-config privileged EXEC command. VLANs not displayed cannot be used in the interface range command. The commands entered under interface range command are applied to all existing VLAN SVIs in the range.
All configuration changes made to an interface range are saved to NVRAM, but the interface range itself is not saved to NVRAM.
You can enter the interface range in two ways:
•
•
All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs. However, you can define up to five interface ranges with a single command, with each range separated by a comma.
Valid values for port-range type and interface:
•
•
•
For physical interfaces:
–
–
•
Note
When you define a range, you must enter a space between the first entry and the hyphen (-):
interface range gigabitethernet0/1 -2When you define multiple ranges, you must still enter a space after the first entry and before the comma (,):
interface range fastethernet0/1 - 2, gigabitethernet0/1 - 2You cannot specify both a macro and an interface range in the same command.
A single interface can also be specified in port-range (this would make the command similar to the interface interface-id global configuration command).
Note
Examples
This example shows how to use the interface range command to enter interface range configuration mode to apply commands to two ports:
Switch(config)# interface range gigabitethernet0/1 - 2Switch(config-if-range)#This example shows how to use a port-range macro macro1 for the same function. The advantage is that you can reuse macro1 until you delete it.
Switch(config)# define interface-range macro1 gigabitethernet0/1 - 2Switch(config)# interface range macro macro1Switch(config-if-range)#Related Commands
Creates an interface range macro.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
interface vlan
Use the interface vlan global configuration command to create or access a VLAN and to enter interface configuration mode. Use the no form of this command to delete a VLAN.
interface vlan vlan-id
no interface vlan vlan-id
Syntax Description
Defaults
The default VLAN interface is VLAN 1.
Command Modes
Global configuration
Command History
Usage Guidelines
VLANs are created the first time that you enter the interface vlan vlan-id command for a particular vlan. The vlan-id corresponds to the VLAN-tag associated with data frames on an IEEE 802.1Q encapsulated trunk or the VLAN ID configured for an access port.
If you delete a VLAN by entering the no interface vlan vlan-id command, the deleted interface is no longer visible in the output from the show interfaces privileged EXEC command.
Note
You can reinstate a deleted VLAN by entering the interface vlan vlan-id command for the deleted interface. The interface comes back up, but much of the previous configuration will be gone.
Examples
This example shows how to create VLAN ID 23 and enter interface configuration mode:
Switch(config)# interface vlan 23Switch(config-if)#You can verify your setting by entering the show interfaces and show interfaces vlan vlan-id privileged EXEC commands.
Related Commands
show interfaces vlan vlan-id
Displays the administrative and operational status of all interfaces or the specified VLAN.
ip access-group
Use the ip access-group interface configuration command to control access to a Layer 2 interface. Use the no form of this command to remove all access groups or the specified access group from the interface.
ip access-group {access-list-number | name} {in}
no ip access-group [access-list-number | name] {in}
Syntax Description
Defaults
No access list is applied to the interface.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can apply named or numbered standard or extended IP access lists to an interface. To define an access list by name, use the ip access-list global configuration command. To define a numbered access list, use the access list global configuration command. You can used numbered standard access lists ranging from 1 to 99 and 1300 to 1999 or extended access lists ranging from 100 to 199 and 2000 to 2699.
You can use this command to apply an access list to a Layer 2 interface (port ACL). However, note these limitations for port ACLs:
•
•
•
•
You can use input port ACLs and VLAN maps on the same switch. However, a port ACL always takes precedence. When both an input port ACL and a VLAN map are applied, incoming packets received on ports with the port ACL applied are filtered by the port ACL. Other packets are filtered by the VLAN map.
For standard inbound access lists, after the switch receives a packet, it checks the source address of the packet against the access list. IP extended access lists can optionally check other fields in the packet, such as the destination IP address, protocol type, or port numbers. If the access list permits the packet, the switch continues to process the packet. If the access list denies the packet, the switch discards the packet.
If the specified access list does not exist, all packets are passed.
Examples
This example shows how to apply IP access list 101 to inbound packets on a port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# ip access-group 101 inYou can verify your settings by entering the show ip interface, show access-lists, or show ip access-lists privileged EXEC command.
Related Commands
ip address
Use the ip address interface configuration command to set an IP address for the Layer 2 switch. Use the no form of this command to remove an IP address or to disable IP processing.
ip address ip-address subnet-mask [secondary]
no ip address [ip-address subnet-mask] [secondary]
Syntax Description
Defaults
No IP address is defined.
Command Modes
Interface configuration
Command History
Usage Guidelines
If you remove the switch IP address through a Telnet session, your connection to the switch will be lost.
Hosts can find subnet masks using the Internet Control Message Protocol (ICMP) Mask Request message. Routers respond to this request with an ICMP Mask Reply message.
You can disable IP processing on a particular interface by removing its IP address with the no ip address command. If the switch detects another host using one of its IP addresses, it will send an error message to the console.
You can use the optional keyword secondary to specify an unlimited number of secondary addresses. Secondary addresses are treated like primary addresses, except the system never generates datagrams other than routing updates with secondary source addresses. IP broadcasts and ARP requests are handled properly, as are interface routes in the IP routing table.
Note
If your switch receives its IP address from a Bootstrap Protocol (BOOTP) or a DHCP server and you remove the switch IP address by using the no ip address command, IP processing is disabled, and the BOOTP or the DHCP server cannot reassign the address.
Examples
This example shows how to configure the IP address for the Layer 2 switch on a subnetted network:
Switch(config)# interface vlan 1Switch(config-if)# ip address 172.20.128.2 255.255.255.0You can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
ip arp inspection filter vlan
Use the ip arp inspection filter vlan global configuration command to permit or deny Address Resolution Protocol (ARP) requests and responses from a host configured with a static IP address when dynamic ARP inspection is enabled. Use the no form of this command to return to the default settings.
ip arp inspection filter arp-acl-name vlan vlan-range [static]
no ip arp inspection filter arp-acl-name vlan vlan-range [static]
Syntax Description
Defaults
No defined ARP ACLs are applied to any VLAN.
Command Modes
Global configuration
Command History
Usage Guidelines
When an ARP ACL is applied to a VLAN for dynamic ARP inspection, only the ARP packets with IP-to-MAC address bindings are compared against the ACL. If the ACL permits a packet, the switch forwards it. All other packet types are bridged in the ingress VLAN without validation.
If the switch denies a packet because of an explicit deny statement in the ACL, the packet is dropped. If the switch denies a packet because of an implicit deny statement, the packet is then compared against the list of DHCP bindings (unless the ACL is static, which means that packets are not compared against the bindings).
Use the arp access-list acl-name global configuration command to define the ARP ACL or to add clauses to the end of a predefined list.
Examples
This example shows how to apply the ARP ACL static-hosts to VLAN 1 for dynamic ARP inspection:
Switch(config)# ip arp inspection filter static-hosts vlan 1You can verify your settings by entering the show ip arp inspection vlan 1 privileged EXEC command.
Related Commands
Defines an ARP ACL.
Denies an ARP packet based on matches against the DHCP bindings.
Permits an ARP packet based on matches against the DHCP bindings.
Displays detailed information about ARP access lists.
show ip arp inspection vlan vlan-range
Displays the configuration and the operating state of dynamic ARP inspection for the specified VLAN.
ip arp inspection limit
Use the ip arp inspection limit interface configuration command to limit the rate of incoming Address Resolution Protocol (ARP) requests and responses on an interface. It prevents dynamic ARP inspection from using all of the switch resources if a denial-of-service attack occurs. Use the no form of this command to return to the default settings.
ip arp inspection limit {rate pps [burst interval seconds] | none}
no ip arp inspection limit
Syntax Description
Defaults
The rate is 15 pps on untrusted interfaces, assuming that the network is a switched network with a host connecting to as many as 15 new hosts per second.
The rate is unlimited on all trusted interfaces.
The burst interval is 1 second.
Command Modes
Interface configuration
Command History
Usage Guidelines
The rate applies to both trusted and untrusted interfaces. Configure appropriate rates on trunks to process packets across multiple dynamic ARP inspection-enabled VLANs, or use the none keyword to make the rate unlimited.
After a switch receives more than the configured rate of packets every second consecutively over a number of burst seconds, the interface is placed into an error-disabled state.
Unless you explicitly configure a rate limit on an interface, changing the trust state of the interface also changes its rate limit to the default value for that trust state. After you configure the rate limit, the interface retains the rate limit even when its trust state is changed. If you enter the no ip arp inspection limit interface configuration command, the interface reverts to its default rate limit.
You should configure trunk ports with higher rates to reflect their aggregation. When the rate of incoming packets exceeds the user-configured rate, the switch places the interface into an error-disabled state. The error-disable recovery feature automatically removes the port from the error-disabled state according to the recovery setting.
The rate of incoming ARP packets on EtherChannel ports equals the sum of the incoming rate of ARP packets from all the channel members. Configure the rate limit for EtherChannel ports only after examining the rate of incoming ARP packets on all the channel members.
Examples
This example shows how to limit the rate of incoming ARP requests on a port to 25 pps and to set the interface monitoring interval to 5 consecutive seconds:
Switch(config)# interface gigabitethernet1/0/1Switch(config-if)# ip arp inspection limit rate 25 burst interval 5You can verify your settings by entering the show ip arp inspection interfaces interface-id privileged EXEC command.
Related Commands
show ip arp inspection interfaces
Displays the trust state and the rate limit of ARP packets for the specified interface or all interfaces.
ip arp inspection log-buffer
Use the ip arp inspection log-buffer global configuration command to configure the dynamic Address Resolution Protocol (ARP) inspection logging buffer. Use the no form of this command to return to the default settings.
ip arp inspection log-buffer {entries number | logs number interval seconds}
no ip arp inspection log-buffer {entries | logs}
Syntax Description
Defaults
When dynamic ARP inspection is enabled, denied or dropped ARP packets are logged.
The number of log entries is 32.
The number of system messages is limited to 5 per second.
The logging-rate interval is 1 second.
Command Modes
Global configuration
Command History
Usage Guidelines
A value of 0 is not allowed for both the logs and the interval keywords.
The logs and interval settings interact. If the logs number X is greater than interval seconds Y, X divided by Y (X/Y) system messages are sent every second. Otherwise, one system message is sent every Y divided by X (Y/X) seconds. For example, if the logs number is 20 and the interval seconds is 4, the switch generates system messages for five entries every second while there are entries in the log buffer.
A log buffer entry can represent more than one packet. For example, if an interface receives many packets on the same VLAN with the same ARP parameters, the switch combines the packets as one entry in the log buffer and generates a system message as a single entry.
If the log buffer overflows, it means that a log event does not fit into the log buffer, and the output display for the show ip arp inspection log privileged EXEC command is affected. A -- in the output display appears in place of all data except the packet count and the time. No other statistics are provided for the entry. If you see this entry in the display, increase the number of entries in the log buffer, or increase the logging rate.
Examples
This example shows how to configure the logging buffer to hold up to 45 entries:
Switch(config)# ip arp inspection log-buffer entries 45This example shows how to configure the logging rate to 20 log entries per 4 seconds. With this configuration, the switch generates system messages for five entries every second while there are entries in the log buffer.
Switch(config)# ip arp inspection log-buffer logs 20 interval 4You can verify your settings by entering the show ip arp inspection log privileged EXEC command.
Related Commands
ip arp inspection trust
Use the ip arp inspection trust interface configuration command to configure an interface trust state that determines which incoming Address Resolution Protocol (ARP) packets are inspected. Use the no form of this command to return to the default setting.
ip arp inspection trust
no ip arp inspection trust
Syntax Description
This command has no arguments or keywords.
Defaults
The interface is untrusted.
Command Modes
Interface configuration
Command History
Usage Guidelines
The switch does not check ARP packets that it receives on the trusted interface; it simply forwards the packets.
For untrusted interfaces, the switch intercepts all ARP requests and responses. It verifies that the intercepted packets have valid IP-to-MAC address bindings before updating the local cache and before forwarding the packet to the appropriate destination. The switch drops invalid packets and logs them in the log buffer according to the logging configuration specified with the ip arp inspection vlan logging global configuration command.
Examples
This example shows how to configure a port to be trusted:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# ip arp inspection trustYou can verify your setting by entering the show ip arp inspection interfaces interface-id privileged EXEC command.
Related Commands
Configures the dynamic ARP inspection logging buffer.
show ip arp inspection interfaces
Displays the trust state and the rate limit of ARP packets for the specified interface or all interfaces.
Displays the configuration and contents of the dynamic ARP inspection log buffer.
ip arp inspection validate
Use the ip arp inspection validate global configuration command to perform specific checks for dynamic Address Resolution Protocol (ARP) inspection. Use the no form of this command to return to the default settings.
ip arp inspection validate {[src-mac] [dst-mac] [ip [allow zeros]]}
no ip arp inspection validate [src-mac] [dst-mac] [ip [allow zeros]]
Syntax Description
Defaults
No checks are performed.
Command Modes
Global configuration
Command History
Usage Guidelines
You must specify at least one of the keywords. Each command overrides the configuration of the previous command; that is, if a command enables src-mac and dst-mac validations, and a second command enables IP validation only, the src-mac and dst-mac validations are disabled as a result of the second command.
The allow-zeros keyword interacts with ARP access control lists (ACLs) in this way:
•
•
The no form of the command disables only the specified checks. If none of the options are enabled, all checks are disabled.
Examples
This example show how to enable source MAC validation:
Switch(config)# ip arp inspection validate src-macYou can verify your setting by entering the show ip arp inspection vlan vlan-range privileged EXEC command.
Related Commands
show ip arp inspection vlan vlan-range
Displays the configuration and the operating state of dynamic ARP inspection for the specified VLAN.
ip arp inspection vlan
Use the ip arp inspection vlan global configuration command to enable dynamic Address Resolution Protocol (ARP) inspection on a per-VLAN basis. Use the no form of this command to return to the default setting.
ip arp inspection vlan vlan-range
no ip arp inspection vlan vlan-range
Syntax Description
vlan-range
VLAN number or range.
You can specify a single VLAN identified by VLAN ID number, a range of VLANs separated by a hyphen, or a series of VLANs separated by a comma. The range is 1 to 4094.
Defaults
ARP inspection is disabled on all VLANs.
Command Modes
Global configuration
Command History
Usage Guidelines
You must specify the VLANs on which to enable dynamic ARP inspection.
Dynamic ARP inspection is supported on access ports, trunk ports, EtherChannel ports, or private VLAN ports.
Examples
This example shows how to enable dynamic ARP inspection on VLAN 1:
Switch(config)# ip arp inspection vlan 1You can verify your setting by entering the show ip arp inspection vlan vlan-range privileged EXEC command.
Related Commands
Defines an ARP access control list (ACL).
show ip arp inspection vlan vlan-range
Displays the configuration and the operating state of dynamic ARP inspection for the specified VLAN.
ip arp inspection vlan logging
Use the ip arp inspection vlan logging global configuration command to control the type of packets that are logged per VLAN. Use the no form of this command to disable this logging control.
ip arp inspection vlan vlan-range logging {acl-match {matchlog | none} | dhcp-bindings {all | none | permit} | arp-probe}
no ip arp inspection vlan vlan-range logging {acl-match | dhcp-bindings | arp-probe}
Syntax Description
Defaults
All denied or all dropped packets are logged. ARP probe packets are not logged.
Command Modes
Global configuration
Command History
Usage Guidelines
The term logged means that the entry is placed into the log buffer and that a system message is generated.
The acl-match and dhcp-bindings keywords merge with each other; that is, when you configure an ACL match, the DHCP bindings configuration is not disabled. Use the no form of the command to reset the logging criteria to their defaults. If neither option is specified, all types of logging are reset to log when ARP packets are denied. These are the options:
•
•
If neither the acl-match or the dhcp-bindings keywords are specified, all denied packets are logged.
The implicit deny at the end of an ACL does not include the log keyword. This means that when you use the static keyword in the ip arp inspection filter vlan global configuration command, the ACL overrides the DHCP bindings. Some denied packets might not be logged unless you explicitly specify the deny ip any mac any log ACE at the end of the ARP ACL.
Examples
This example shows how to configure ARP inspection on VLAN 1 to log packets that match the permit commands in the ACL:
Switch(config)# arp access-list test1Switch(config-arp-nacl)# permit request ip any mac any logSwitch(config-arp-nacl)# permit response ip any any mac any any logSwitch(config-arp-nacl)# exitSwitch(config)# ip arp inspection vlan 1 logging acl-match matchlogYou can verify your settings by entering the show ip arp inspection vlan vlan-range privileged EXEC command.
Related Commands
Defines an ARP ACL.
Clears the dynamic ARP inspection log buffer.
Configures the dynamic ARP inspection logging buffer.
Displays the configuration and contents of the dynamic ARP inspection log buffer.
show ip arp inspection vlan vlan-range
Displays the configuration and the operating state of dynamic ARP inspection for the specified VLAN.
ip dhcp snooping
Use the ip dhcp snooping global configuration command to globally enable DHCP snooping. Use the no form of this command to return to the default setting.
ip dhcp snooping
no ip dhcp snooping
Syntax Description
This command has no arguments or keywords.
Defaults
DHCP snooping is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
For any DHCP snooping configuration to take effect, you must globally enable DHCP snooping.
DHCP snooping is not active until you enable snooping on a VLAN by using the ip dhcp snooping vlan vlan-id global configuration command.
Examples
This example shows how to enable DHCP snooping:
Switch(config)# ip dhcp snoopingYou can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Enables DHCP snooping on a VLAN.
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping binding
Use the ip dhcp snooping binding privileged EXEC command to configure the DHCP snooping binding database and to add binding entries to the database. Use the no form of this command to delete entries from the binding database.
ip dhcp snooping binding mac-address vlan vlan-id ip-address interface interface-id expiry seconds
no ip dhcp snooping binding mac-address vlan vlan-id ip-address interface interface-id
Syntax Description
Defaults
No default database is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use this command when you are testing or debugging the switch.
In the DHCP snooping binding database, each database entry, also referred to a binding, has an IP address, an associated MAC address, the lease time (in hexadecimal format), the interface to which the binding applies, and the VLAN to which the interface belongs. The database can have up to 8192 bindings.
Use the show ip dhcp snooping binding privileged EXEC command to display only the dynamically configured bindings. Use the show ip source binding privileged EXEC command to display the dynamically and statically configured bindings.
Examples
This example shows how to generate a DHCP binding configuration with an expiration time of 1000 seconds on a port in VLAN 1:
Switch# ip dhcp snooping binding 0001.1234.1234 vlan 1 172.20.50.5 interface gigabitethernet0/1 expiry 1000You can verify your settings by entering the show ip dhcp snooping binding or the show ip dhcp source binding privileged EXEC command.
Related Commands
Enables DHCP snooping on a VLAN.
Displays the dynamically configured bindings in the DHCP snooping binding database and the configuration information.
ip dhcp snooping database
Use the ip dhcp snooping database global configuration command to configure the DHCP snooping binding database agent. Use the no form of this command to disable the agent, to reset the timeout value, or to reset the write-delay value.
ip dhcp snooping database {{flash:/filename | ftp://user:password@host/filename | http://[[username:password]@]{hostname | host-ip}[/directory]/image-name.tar | rcp://user@host/filename | tftp://host/filename} | timeout seconds | write-delay seconds}
no ip dhcp snooping database [timeout | write-delay]
Syntax Description
Defaults
The URL for the database agent or binding file is not defined.
The timeout value is 300 seconds (5 minutes).
The write-delay value is 300 seconds (5 minutes).
Command Modes
Global configuration
Command History
Usage Guidelines
The DHCP snooping binding database can have up to 8192 bindings.
To ensure that the lease time in the database is accurate, we recommend that Network Time Protocol (NTP) is enabled and configured for these features:
•
•
•
•
•
If NTP is configured, the switch writes binding changes to the binding file only when the switch system clock is synchronized with NTP.
Because both NVRAM and the flash memory have limited storage capacity, we recommend that you store a binding file on a TFTP server. You must create an empty file at the configured URL on network-based URLs (such as TFTP and FTP) before the switch can write bindings to the binding file at that URL for the first time.
Use the no ip dhcp snooping database command to disable the agent.
Use the no ip dhcp snooping database timeout command to reset the timeout value.
Use the no ip dhcp snooping database write-delay command to reset the write-delay value.
Examples
This example shows how to store a binding file at an IP address of 10.1.1.1 that is in a directory called directory. A file named file must be present on the TFTP server.
Switch(config)# ip dhcp snooping database tftp://10.1.1.1/directory/fileYou can verify your settings by entering the show ip dhcp snooping database privileged EXEC command.
Related Commands
Enables DHCP snooping on a VLAN.
Configures the DHCP snooping binding database.
Displays the status of DHCP snooping database agent.
ip dhcp snooping information option
Use the ip dhcp snooping information option global configuration command to enable DHCP option-82 data insertion. Use the no form of this command to disable DHCP option-82 data insertion.
ip dhcp snooping information option
no ip dhcp snooping information option
Syntax Description
This command has no arguments or keywords.
Defaults
DHCP option-82 data insertion is enabled.
Command Modes
Global configuration
Command History
Usage Guidelines
You must globally enable DHCP snooping by using the ip dhcp snooping global configuration command for any DHCP snooping configuration to take effect.
When the option-82 feature is enabled and a switch receives a DHCP request from a host, it adds the option-82 information in the packet. The option-82 information contains the switch MAC address (the remote ID suboption) and the port identifier, vlan-mod-port, from which the packet is received (circuit ID suboption). The switch forwards the DHCP request that includes the option-82 field to the DHCP server.
When the DHCP server receives the packet, it can use the remote ID, the circuit ID, or both to assign IP addresses and implement policies, such as restricting the number of IP addresses that can be assigned to a single remote ID or a circuit ID. Then the DHCP server echoes the option-82 field in the DHCP reply.
The DHCP server unicasts the reply to the switch if the request was relayed to the server by the switch. When the client and server are on the same subnet, the server broadcasts the reply. The switch inspects the remote ID and possibly the circuit ID fields to verify that it originally inserted the option-82 data. The switch removes the option-82 field and forwards the packet to the switch port that connects to the DHCP host that sent the DHCP request.
Examples
This example shows how to enable DHCP option-82 data insertion:
Switch(config)# ip dhcp snooping information optionYou can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping information option allowed-untrusted
Use the ip dhcp snooping information option allowed-untrusted global configuration command on an aggregation switch to configure it to accept DHCP packets with option-82 information that are received on untrusted ports that might be connected to an edge switch. Use the no form of this command to configure the switch to drop these packets from the edge switch.
ip dhcp snooping information option allowed-untrusted
no ip dhcp snooping information option allowed-untrusted
Syntax Description
This command has no arguments or keywords.
Defaults
The switch drops DHCP packets with option-82 information that are received on untrusted ports that might be connected to an edge switch.
Command Modes
Global configuration
Command History
Usage Guidelines
You might want an edge switch to which a host is connected to insert DHCP option-82 information at the edge of your network. You might also want to enable DHCP security features, such as DHCP snooping, IP source guard, or dynamic Address Resolution Protocol (ARP) inspection, on an aggregation switch. However, if DHCP snooping is enabled on the aggregation switch, the switch drops packets with option-82 information that are received on an untrusted port and does not learn DHCP snooping bindings for connected devices on a trusted interface.
If the edge switch to which a host is connected inserts option-82 information and you want to use DHCP snooping on an aggregation switch, enter the ip dhcp snooping information option allowed-untrusted command on the aggregation switch. The aggregation switch can learn the bindings for a host even though the aggregation switch receives DHCP snooping packets on an untrusted port. You can also enable DHCP security features on the aggregation switch. The port on the edge switch to which the aggregation switch is connected must be configured as a trusted port.
Note
Examples
This example shows how to configure an access switch to not check the option-82 information in untrusted packets from an edge switch and to accept the packets:
Switch(config)# ip dhcp snooping information option allowed-untrustedYou can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping information option format remote-id
Use the ip dhcp snooping information option format remote-id global configuration command to configure the option-82 remote-ID suboption. Use the no form of this command to configure the default remote-ID suboption.
ip dhcp snooping information option format remote-id [string ASCII-string | hostname]
no ip dhcp snooping information option format remote-id
Syntax Description
string ASCII-string
Specify a remote ID, using from 1 to 63 ASCII characters (no spaces).
hostname
Specify the switch hostname as the remote ID.
Defaults
The switch MAC address is the remote ID.
Command Modes
Global configuration
Command History
Usage Guidelines
You must globally enable DHCP snooping by using the ip dhcp snooping global configuration command for any DHCP snooping configuration to take effect.
When the option-82 feature is enabled, the default remote-ID suboption is the switch MAC address. This command allows you to configure either the switch hostname or a string of up to 63 ASCII characters (but no spaces) to be the remote ID.
Note
Examples
This example shows how to configure the option-82 remote-ID suboption:
Switch(config)# ip dhcp snooping information option format remote-id hostnameYou can verify your settings by entering the show ip dhcp snooping user EXEC command.
Related Commands
ip dhcp snooping vlan information option format-type circuit-id string
Configures the option-82 circuit-ID suboption.
Displays the DHCP snooping configuration.
ip dhcp snooping limit rate
Use the ip dhcp snooping limit rate interface configuration command to configure the number of DHCP messages an interface can receive per second. Use the no form of this command to return to the default setting.
ip dhcp snooping limit rate rate
no ip dhcp snooping limit rate
Syntax Description
Defaults
DHCP snooping rate limiting is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
Normally, the rate limit applies to untrusted interfaces. If you want to configure rate limiting for trusted interfaces, keep in mind that trusted interfaces might aggregate DHCP traffic on multiple VLANs (some of which might not be snooped) in the switch, and you will need to adjust the interface rate limits to a higher value.
If the rate limit is exceeded, the interface is error-disabled. If you enabled error recovery by entering the errdisable recovery dhcp-rate-limit global configuration command, the interface retries the operation again when all the causes have timed out. If the error-recovery mechanism is not enabled, the interface stays in the error-disabled state until you enter the shutdown and no shutdown interface configuration commands.
Examples
This example shows how to set a message rate limit of 150 messages per second on an interface:
Switch(config-if)# ip dhcp snooping limit rate 150You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Configures the recover mechanism.
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping trust
Use the ip dhcp snooping trust interface configuration command to configure a port as trusted for DHCP snooping purposes. Use the no form of this command to return to the default setting.
ip dhcp snooping trust
no ip dhcp snooping trust
Syntax Description
This command has no arguments or keywords.
Defaults
DHCP snooping trust is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
Configure as trusted ports those that are connected to a DHCP server or to other switches or routers. Configure as untrusted ports those that are connected to DHCP clients.
Examples
This example shows how to enable DHCP snooping trust on a port:
Switch(config-if)# ip dhcp snooping trustYou can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping verify mac-address
Use the ip dhcp snooping verify mac-address global configuration command to configure the switch to verify on an untrusted port that the source MAC address in a DHCP packet matches the client hardware address. Use the no form of this command to configure the switch to not verify the MAC addresses.
ip dhcp snooping verify mac-address
no ip dhcp snooping verify mac-address
Syntax Description
This command has no arguments or keywords.
Defaults
The switch verifies the source MAC address in a DHCP packet that is received on untrusted ports matches the client hardware address in the packet.
Command Modes
Global configuration
Command History
Usage Guidelines
In a service-provider network, when a switch receives a packet from a DHCP client on an untrusted port, it automatically verifies that the source MAC address and the DHCP client hardware address match. If the addresses match, the switch forwards the packet. If the addresses do not match, the switch drops the packet.
Examples
This example shows how to disable the MAC address verification:
Switch(config)# no ip dhcp snooping verify mac-addressYou can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
ip dhcp snooping vlan
Use the ip dhcp snooping vlan global configuration command to enable DHCP snooping on a VLAN. Use the no form of this command to disable DHCP snooping on a VLAN.
ip dhcp snooping vlan vlan-range
no ip dhcp snooping vlan vlan-range
Syntax Description
Defaults
DHCP snooping is disabled on all VLANs.
Command Modes
Global configuration
Command History
Usage Guidelines
You must first globally enable DHCP snooping before enabling DHCP snooping on a VLAN.
Examples
This example shows how to enable DHCP snooping on VLAN 10:
Switch(config)# ip dhcp snooping vlan 10You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
ip dhcp snooping vlan information option format-type circuit-id string
Use the ip dhcp snooping vlan information option format-type circuit-id string interface configuration command to configure the option-82 circuit-ID suboption. Use the no form of this command to configure the default circuit-ID suboption.
ip dhcp snooping vlan vlan information option format-type circuit-id string ASCII-string
no ip dhcp snooping vlan vlan information option format-type circuit-id string
Syntax Description
vlan vlan
Specify the VLAN ID. The range is 1 to 4094.
string ASCII-string
Specify a circuit ID, using from 3 to 63 ASCII characters (no spaces).
Defaults
The switch VLAN and the port identifier, in the format vlan-mod-port, is the default circuit ID.
Command Modes
Interface configuration
Command History
Usage Guidelines
You must globally enable DHCP snooping by using the ip dhcp snooping global configuration command for any DHCP snooping configuration to take effect.
When the option-82 feature is enabled, the default circuit-ID suboption is the switch VLAN and the port identifier, in the format vlan-mod-port. This command allows you to configure a string of ASCII characters to be the circuit ID.
Note
Examples
This example shows how to configure the option-82 circuit-ID suboption:
Switch(config-if)# ip dhcp snooping vlan 250 information option format-type circuit-id string customerABC-250-0-0You can verify your settings by entering the show ip dhcp snooping user EXEC command.
Note
Related Commands
Configures the option-82 remote-ID suboption.
Displays the DHCP snooping configuration.
ip igmp filter
Use the ip igmp filter interface configuration command to control whether or not all hosts on a Layer 2 interface can join one or more IP multicast groups by applying an Internet Group Management Protocol (IGMP) profile to the interface. Use the no form of this command to remove the specified profile from the interface.
ip igmp filter profile number
no ip igmp filter
Syntax Description
Defaults
No IGMP filters are applied.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can apply IGMP filters only to Layer 2 physical interfaces.
You cannot apply IGMP filters to ports that belong to an EtherChannel group.
An IGMP profile can be applied to one or more switch port interfaces, but one port can have only one profile applied to it.
Examples
This example shows how to apply IGMP profile 22 to a port.
Switch(config)# interface gigabitethernet0/2Switch(config-if)# ip igmp filter 22You can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.
Related Commands
ip igmp max-groups
Use the ip igmp max-groups interface configuration command to set the maximum number of Internet Group Management Protocol (IGMP) groups that a Layer 2 interface can join or to configure the IGMP throttling action when the maximum number of entries is in the forwarding table. Use the no form of this command to set the maximum back to the default, which is to have no maximum limit, or to return to the default throttling action, which is to drop the report.
ip igmp max-groups {number | action {deny | replace}}
no ip igmp max-groups {number | action}
Syntax Description
Defaults
The default maximum number of groups is no limit.
After the switch learns the maximum number of IGMP group entries on an interface, the default throttling action is to drop the next IGMP report that the interface receives and to not add an entry for the IGMP group to the interface.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces.
You cannot set IGMP maximum groups for ports that belong to an EtherChannel group.
Follow these guidelines when configuring the IGMP throttling action:
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•
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Examples
This example shows how to limit to 25 the number of IGMP groups that a port can join.
Switch(config)# interface gigabitethernet0/2Switch(config-if)# ip igmp max-groups 25This example shows how to configure the switch to replace the existing group with the new group for which the IGMP report was received when the maximum number of entries is in the forwarding table:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# ip igmp max-groups action replaceYou can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.
Related Commands
ip igmp profile
Use the ip igmp profile global configuration command to create an Internet Group Management Protocol (IGMP) profile and enter IGMP profile configuration mode. From this mode, you can specify the configuration of the IGMP profile to be used for filtering IGMP membership reports from a switchport. Use the no form of this command to delete the IGMP profile.
ip igmp profile profile number
no ip igmp profile profile number
Syntax Description
Defaults
No IGMP profiles are defined. When configured, the default action for matching an IGMP profile is to deny matching addresses.
Command Modes
Global configuration
Command History
Usage Guidelines
When you are in IGMP profile configuration mode, you can create the profile by using these commands:
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•
•
•
•
When entering a range, enter the low IP multicast address, a space, and the high IP multicast address.
You can apply an IGMP profile to one or more Layer 2 interfaces, but each interface can have only one profile applied to it.
Examples
This example shows how to configure IGMP profile 40 that permits the specified range of IP multicast addresses.
Switch(config)# ip igmp profile 40Switch(config-igmp-profile)# permitSwitch(config-igmp-profile)# range 233.1.1.1 233.255.255.255You can verify your settings by using the show ip igmp profile privileged EXEC command.
Related Commands
Applies the IGMP profile to the specified interface.
Displays the characteristics of all IGMP profiles or the specified IGMP profile number.
ip igmp snooping
Use the ip igmp snooping global configuration command to globally enable Internet Group Management Protocol (IGMP) snooping on the switch or to enable it on a per-VLAN basis. Use the no form of this command to return to the default setting.
ip igmp snooping [vlan vlan-id]
no ip igmp snooping [vlan vlan-id]
Syntax Description
vlan vlan-id
(Optional) Enable IGMP snooping on the specified VLAN. The range is 1 to 1001 and 1006 to 4094.
Defaults
IGMP snooping is globally enabled on the switch.
IGMP snooping is enabled on VLAN interfaces.
Command Modes
Global configuration
Command History
Usage Guidelines
When IGMP snooping is enabled globally, it is enabled in all the existing VLAN interfaces. When IGMP snooping is disabled globally, it is disabled on all the existing VLAN interfaces.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Examples
This example shows how to globally enable IGMP snooping:
Switch(config)# ip igmp snoopingThis example shows how to enable IGMP snooping on VLAN 1:
Switch(config)# ip igmp snooping vlan 1You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping last-member-query-interval
Use the ip igmp snooping last-member-query-interval global configuration command to enable the Internet Group Management Protocol (IGMP) configurable-leave timer globally or on a per-VLAN basis. Use the no form of this command to return to the default setting.
ip igmp snooping [vlan vlan-id] last-member-query-interval time
no ip igmp snooping [vlan vlan-id] last-member-query-interval
Syntax Description
t
Defaults
The default timeout setting is 1000 milliseconds.
Command Modes
Global configuration
Command History
12.2(25)EX
This command was introduced.
12.2(46)SE
The range for time was modified to 100 to 32768 milliseconds.
Usage Guidelines
When IGMP snooping is globally enabled, IGMP snooping is enabled on all the existing VLAN interfaces. When IGMP snooping is globally disabled, IGMP snooping is disabled on all the existing VLAN interfaces.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Configuring the leave timer on a VLAN overrides the global setting.
The IGMP configurable leave time is only supported on devices running IGMP Version 2.
The configuration is saved in NVRAM.
Examples
This example shows how to globally enable the IGMP leave timer for 2000 milliseconds:
Switch(config)# ip igmp snooping last-member-query-interval 2000This example shows how to configure the IGMP leave timer for 3000 milliseconds on VLAN 1:
Switch(config)# ip igmp snooping vlan 1 last-member-query-interval 3000You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping querier
Use the ip igmp snooping querier global configuration command to globally enable the Internet Group Management Protocol (IGMP) querier function in Layer 2 networks. Use the command with keywords to enable and configure the IGMP querier feature on a VLAN interface. Use the no form of this command to return to the default settings.
ip igmp snooping querier [vlan vlan-id] [address ip-address | max-response-time response-time | query-interval interval-count | tcn query [count count | interval interval] | timer expiry | version version]
no ip igmp snooping querier [vlan vlan-id] [address | max-response-time | query-interval | tcn query { count count | interval interval} | timer expiry | version]
Syntax Description
Defaults
The IGMP snooping querier feature is globally disabled on the switch.
When enabled, the IGMP snooping querier disables itself if it detects IGMP traffic from a multicast-enabled device.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to enable IGMP snooping to detect the IGMP version and IP address of a device that sends IGMP query messages, which is also called a querier.
By default, the IGMP snooping querier is configured to detect devices that use IGMP Version 2 (IGMPv2) but does not detect clients that are using IGMP Version 1 (IGMPv1). You can manually configure the max-response-time value when devices use IGMPv2. You cannot configure the max-response-time when devices use IGMPv1. (The value cannot be configured and is set to zero).
Non-RFC compliant devices running IGMPv1 might reject IGMP general query messages that have a non-zero value as the max-response-time value. If you want the devices to accept the IGMP general query messages, configure the IGMP snooping querier to run IGMPv1.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Examples
This example shows how to globally enable the IGMP snooping querier feature:
Switch(config)# ip igmp snooping querierThis example shows how to set the IGMP snooping querier maximum response time to 25 seconds:
Switch(config)# ip igmp snooping querier max-response-time 25This example shows how to set the IGMP snooping querier interval time to 60 seconds:
Switch(config)# ip igmp snooping querier query-interval 60This example shows how to set the IGMP snooping querier TCN query count to 25:
Switch(config)# ip igmp snooping querier tcn count 25This example shows how to set the IGMP snooping querier timeout to 60 seconds:
Switch(config)# ip igmp snooping querier timeout expiry 60This example shows how to set the IGMP snooping querier feature to version 2:
Switch(config)# ip igmp snooping querier version 2You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
Enables IGMP report suppression.
Displays the IGMP snooping configuration.
Displays IGMP snooping multicast information.
Displays the IGMP snooping router ports.
ip igmp snooping report-suppression
Use the ip igmp snooping report-suppression global configuration command to enable Internet Group Management Protocol (IGMP) report suppression. Use the no form of this command to disable IGMP report suppression and to forward all IGMP reports to multicast routers.
ip igmp snooping report-suppression
no ip igmp snooping report-suppression
Syntax Description
This command has no arguments or keywords.
Defaults
IGMP report suppression is enabled.
Command Modes
Global configuration
Command History
Usage Guidelines
IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports. This feature is not supported when the query includes IGMPv3 reports.
The switch uses IGMP report suppression to forward only one IGMP report per multicast router query to multicast devices. When IGMP router suppression is enabled (the default), the switch sends the first IGMP report from all hosts for a group to all the multicast routers. The switch does not send the remaining IGMP reports for the group to the multicast routers. This feature prevents duplicate reports from being sent to the multicast devices.
If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the switch forwards only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers. If the multicast router query also includes requests for IGMPv3 reports, the switch forwards all IGMPv1, IGMPv2, and IGMPv3 reports for a group to the multicast devices.
If you disable IGMP report suppression by entering the no ip igmp snooping report-suppression command, all IGMP reports are forwarded to all the multicast routers.
Examples
This example shows how to disable report suppression:
Switch(config)# no ip igmp snooping report-suppressionYou can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
Enables IGMP snooping on the switch or on a VLAN.
Displays the IGMP snooping configuration of the switch or the VLAN.
ip igmp snooping tcn
Use the ip igmp snooping tcn global configuration command to configure the Internet Group Management Protocol (IGMP) Topology Change Notification (TCN) behavior. Use the no form of this command to return to the default settings.
ip igmp snooping tcn {flood query count count | query solicit}
no ip igmp snooping tcn {flood query count | query solicit}
Syntax Description
Defaults
The TCN flood query count is 2.
The TCN query solicitation is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
You can prevent the loss of the multicast traffic that might occur because of a topology change by using this command. If you set the TCN flood query count to 1 by using the ip igmp snooping tcn flood query count command, the flooding stops after receiving one general query. If you set the count to 7, the flooding of multicast traffic due to the TCN event lasts until seven general queries are received. Groups are relearned based on the general queries received during the TCN event.
Examples
This example shows how to specify 7 as the number of IGMP general queries for which the multicast traffic is flooded:
Switch(config)# no ip igmp snooping tcn flood query count 7You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping tcn flood
Use the ip igmp snooping tcn flood interface configuration command to specify multicast flooding as the Internet Group Management Protocol (IGMP) snooping spanning-tree Topology Change Notification (TCN) behavior. Use the no form of this command to disable the multicast flooding.
ip igmp snooping tcn flood
no ip igmp snooping tcn flood
Syntax Description
This command has no arguments or keywords.
Defaults
Multicast flooding is enabled on an interface during a spanning-tree TCN event.
Command Modes
Interface configuration
Command History
Usage Guidelines
When the switch receives a TCN, multicast traffic is flooded to all the ports until two general queries are received. If the switch has many ports with attached hosts that are subscribed to different multicast groups, this flooding behavior might not be desirable because the flooded traffic might exceed the capacity of the link and cause packet loss.
You can change the flooding query count by using the ip igmp snooping tcn flood query count count global configuration command.
Examples
This example shows how to disable the multicast flooding on an interface:
Switch(config)# interface gigabitethernet0/2Switch(config-if)# no ip igmp snooping tcn floodYou can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
Enables IGMP snooping on the switch or on a VLAN.
Configures the IGMP TCN behavior on the switch.
Displays the IGMP snooping configuration of the switch or the VLAN.
ip igmp snooping vlan immediate-leave
Use the ip igmp snooping vlan vlan-id immediate-leave global configuration command to enable Internet Group Management Protocol (IGMP) snooping immediate-leave processing on a per-VLAN basis. Use the no form of this command to return to the default setting.
ip igmp snooping vlan vlan-id immediate-leave
no ip igmp snooping vlan vlan-id immediate-leave
Syntax Description
vlan-id
Enable IGMP snooping and the Immediate-Leave feature on the specified VLAN. The range is 1 to 1001 and 1006 to 4094.
Defaults
IGMP immediate-leave processing is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
You should only configure the Immediate Leave feature when there is a maximum of one receiver on every port in the VLAN. The configuration is saved in NVRAM.
The Immediate Leave feature is supported only with IGMP Version 2 hosts.
Examples
This example shows how to enable IGMP immediate-leave processing on VLAN 1:
Switch(config)# ip igmp snooping vlan 1 immediate-leaveYou can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping vlan mrouter
Use the ip igmp snooping vlan vlan-id mrouter global configuration command to add a multicast router port or to configure the multicast learning method. Use the no form of this command to return to the default settings.
ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn pim-dvmrp}
no ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn pim-dvmrp}
Syntax Description
Defaults
By default, there are no multicast router ports.
The default learning method is pim-dvmrp—to snoop IGMP queries and PIM-DVMRP packets.
Command Modes
Global configuration
Command History
Usage Guidelines
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
The configuration is saved in NVRAM.
Examples
This example shows how to configure a port as a multicast router port:
Switch(config)# ip igmp snooping vlan 1 mrouter interface gigabitethernet0/2You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping vlan static
Use the ip igmp snooping vlan vlan-id static global configuration command to enable Internet Group Management Protocol (IGMP) snooping and to statically add a Layer 2 port as a member of a multicast group. Use the no form of this command to remove ports specified as members of a static multicast group.
ip igmp snooping vlan vlan-id static ip-address interface interface-id
no ip igmp snooping vlan vlan-id static ip-address interface interface-id
Syntax Description
Defaults
By default, there are no ports statically configures as members of a multicast group.
Command Modes
Global configuration
Command History
Usage Guidelines
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
The configuration is saved in NVRAM.
Examples
This example shows how to statically configure a port as a multicast router port:
Switch(config)# ip igmp snooping vlan 1 mrouter interface gigabitethernet0/2You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip source binding
Use the ip source binding global configuration command to configure static IP source bindings on the switch. Use the no form of this command to delete static bindings.
ip source binding mac-address vlan vlan-id ip-address interface interface-id
no source binding mac-address vlan vlan-id ip-address interface interface-id
Syntax Description
Defaults
No IP source bindings are configured.
Command Modes
Global configuration
Command History
Usage Guidelines
A static IP source binding entry has an IP address, its associated MAC address, and its associated VLAN number. The entry is based on the MAC address and the VLAN number. If you modify an entry by changing only the IP address, the switch updates the entry instead creating a new one.
Examples
This example shows how to add a static IP source binding:
Switch(config)# ip source binding 0001.1234.1234 vlan 1 172.20.50.5 interface gigabitethernet0/1This example shows how to add a static binding and then modify the IP address for it:
Switch(config)# ip source binding 0001.1357.0007 vlan 1 172.20.50.25 interface gigabitethernet0/1Switch(config)# ip source binding 0001.1357.0007 vlan 1 172.20.50.30 interface gigabitethernet0/1You can verify your settings by entering the show ip source binding privileged EXEC command.
Related Commands
Enables IP source guard on an interface.
Displays the IP source bindings on the switch.
Displays the IP source guard configuration on the switch or on a specific interface.
ip ssh
Use the ip ssh global configuration command to configure the switch to run Secure Shell (SSH) Version 1 or SSH Version 2. Use the no form of this command to return to the default setting.
ip ssh version [1 | 2]
no ip ssh version [1 | 2]
This command is available only when your switch is running the cryptographic (encrypted) software image.
Syntax Description
1
(Optional) Configure the switch to run SSH Version 1 (SSHv1).
2
(Optional) Configure the switch to run SSH Version 2 (SSHv1).
Defaults
The default version is the latest SSH version supported by the SSH client.
Command Modes
Global configuration
Command History
Usage Guidelines
If you do not enter this command or if you do not specify a keyword, the SSH server selects the latest SSH version supported by the SSH client. For example, if the SSH client supports SSHv1 and SSHv2, the SSH server selects SSHv2.
The switch supports an SSHv1 or an SSHv2 server. It also supports an SSHv1 client. For more information about the SSH server and the SSH client, see the software configuration guide for this release.
A Rivest, Shamir, and Adelman (RSA) key pair generated by an SSHv1 server can be used by an SSHv2 server and the reverse.
Examples
This example shows how to configure the switch to run SSH Version 2:
Switch(config)# ip ssh version 2You can verify your settings by entering the show ip ssh or show ssh privileged EXEC command.
Related Commands
ip verify source
Use the ip verify source interface configuration command to enable IP source guard on an interface. Use the no form of this command to disable IP source guard.
ip verify source [port-security]
no ip verify source
Syntax Description
port-security
(Optional) Enable IP source guard with IP and MAC address filtering.
If you do not enter the port-security keyword, IP source guard with IP address filtering is enabled.
Defaults
IP source guard is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
To enable IP source guard with source IP address filtering, use the ip verify source interface configuration command.
To enable IP source guard with source IP and MAC address filtering, use the ip verify source port-security interface configuration command.
To enable IP source guard with source IP and MAC address filtering, you must enable port security on the interface.
Examples
This example shows how to enable IP source guard with source IP address filtering:
Switch(config-if)# ip verify sourceThis example shows how to enable IP source guard with source IP and MAC address filtering:
Switch(config-if)# ip verify source port-securityYou can verify your settings by entering the show ip source binding privileged EXEC command.
Related Commands
Configures static bindings on the switch.
Displays the IP source guard configuration on the switch or on an interface.
lacp port-priority
Use the lacp port-priority interface configuration command to configure the port priority for the Link Aggregation Control Protocol (LACP). Use the no form of this command to return to the default setting.
lacp port-priority priority
no lacp port-priority
Note
Syntax Description
Defaults
The default is 32768.
Command Modes
Interface configuration
Command History
Usage Guidelines
The lacp port-priority interface configuration command determines which ports are bundled and which ports are put in hot-standby mode when there are more than eight ports in an LACP channel group. This command takes effect only on EtherChannel ports that are already configured for LACP. If the interface is a user network interface (UNI), you must use the port-type nni or port-type eni interface configuration command to change the interface to an NNI or ENI before configuring lacp port-priority.
In priority comparisons, numerically lower values have higher priority. The switch uses the priority to decide which ports should be put in standby mode when there is a hardware limitation that prevents all compatible ports from being active. If two or more ports have the same LACP port priority (for example, they are configured with the default setting of 65535), an internal value for the port number determines the priority.
Note
Use the show lacp internal privileged EXEC command to display LACP port priorities and internal port number values.
For information about configuring LACP on physical ports, see the "Configuring EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to configure the LACP port priority on a port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# lacp port-priority 1000You can verify your settings by entering the show lacp [channel-group-number] internal privileged EXEC command.
Related Commands
Assigns an Ethernet port to an EtherChannel group.
Configures the LACP system priority.
show lacp [channel-group-number] internal
Displays internal information for all channel groups or for the specified channel group.
lacp system-priority
Use the lacp system-priority global configuration command to configure the system priority for the Link Aggregation Control Protocol (LACP). Use the no form of this command to return to the default setting.
lacp system-priority priority
no lacp system-priority
Note
Syntax Description
Defaults
The default is 32768.
Command Modes
Global configuration
Command History
Usage Guidelines
The lacp system-priority command determines which switch in an LACP link controls port priorities. Although this is a global configuration command, the priority only takes effect on EtherChannels that have physical ports that are already configured for LACP.
An LACP channel group can have up to 16 Ethernet ports of the same type. Up to eight ports can be active, and up to eight ports can be in standby mode. When there are more than eight ports in an LACP channel group, the switch on the controlling end of the link uses port priorities to determine which ports are bundled into the channel and which ports are put in hot-standby mode. Port priorities on the other switch (the noncontrolling end of the link) are ignored.
In priority comparisons, numerically lower values have higher priority. Therefore, the switch with the numerically lower system value (higher priority value) for LACP system priority becomes the controlling switch. If both switches have the same LACP system priority (for example, they are both configured with the default setting of 32768), the LACP system ID (the switch MAC address) determines which switch is in control.
The lacp system-priority command applies to all LACP EtherChannels on the switch.
Use the show etherchannel summary privileged EXEC command to see which ports are in the hot-standby mode (denoted with an H port-state flag).
For more information about configuring LACP on physical ports, see the "Configuring EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to set the LACP system priority:
Switch(config)# lacp system-priority 20000You can verify your settings by entering the show lacp sys-id privileged EXEC command.
Related Commands
Assigns an Ethernet port to an EtherChannel group.
Configures the LACP port priority.
show lacp sys-id
Displays the system identifier that is being used by LACP.
logging event
Use the logging event interface configuration command to enable notification of interface link status changes. Use the no form of this command to disable notification.
logging event {bundle-status | link-status | spanning-tree | status | trunk status}
no logging event {bundle-status | link-status | spanning-tree | status | trunk status}
Syntax Description
Defaults
Event logging is disabled.
Command Modes
Interface configuration
Command History
Examples
This example shows how to enable spanning-tree logging:
Switch(config-if)# logging event spanning-treelogging file
Use the logging file global configuration command to set logging file parameters. Use the no form of this command to return to the default setting.
logging file filesystem:filename [max-file-size [min-file-size]] [severity-level-number | type]
no logging file filesystem:filename [severity-level-number | type]
Syntax Description
Defaults
The minimum file size is 2048 bytes; the maximum file size is 4096 bytes.
The default severity level is 7 (debugging messages and numerically lower levels).
Command Modes
Global configuration
Command History
Usage Guidelines
The log file is stored in ASCII text format in an internal buffer on the switch. You can access logged system messages by using the switch command-line interface (CLI) or by saving them to a properly configured syslog server. If the switch fails, the log is lost unless you had previously saved it to flash memory by using the logging file flash:filename global configuration command.
After saving the log to flash memory by using the logging file flash:filename global configuration command, you can use the more flash:filename privileged EXEC command to display its contents.
The command rejects the minimum file size if it is greater than the maximum file size minus 1024; the minimum file size then becomes the maximum file size minus 1024.
Specifying a level causes messages at that level and numerically lower levels to be displayed.
Examples
This example shows how to save informational log messages to a file in flash memory:
Switch(config)# logging file flash:logfile informationalYou can verify your setting by entering the show running-config privileged EXEC command.
Related Commands
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
mac access-group
Use the mac access-group interface configuration command to apply a MAC access control list (ACL) to a Layer 2 interface. Use the no form of this command to remove all MAC ACLs or the specified MAC ACL from the interface. You create the MAC ACL by using the mac access-list extended global configuration command.
mac access-group {name} in
no mac access-group {name}
Syntax Description
name
Specify a named MAC access list.
in
Specify that the ACL is applied in the ingress direction. Outbound ACLs are not supported on Layer 2 interfaces.
Defaults
No MAC ACL is applied to the interface.
Command Modes
Interface configuration (Layer 2 interfaces only)
Command History
Usage Guidelines
You can apply MAC ACLs only to ingress Layer 2 interfaces.
On Layer 2 interfaces, you can filter IP traffic by using IP access lists and non-IP traffic by using MAC access lists. You can filter both IP and non-IP traffic on the same Layer 2 interface by applying both an IP ACL and a MAC ACL to the interface. You can apply no more than one IP access list and one MAC access list to the same Layer 2 interface.
If a MAC ACL is already configured on a Layer 2 interface and you apply a new MAC ACL to the interface, the new ACL replaces the previously configured one.
If you apply an ACL to a Layer 2 interface on a switch, and the switch has a VLAN map applied to a VLAN that the interface is a member of, the ACL applied to the Layer 2 interface takes precedence.
When an inbound packet is received on an interface with a MAC ACL applied, the switch checks the match conditions in the ACL. If the conditions are matched, the switch forwards or drops the packet, according to the ACL.
If the specified ACL does not exist, the switch forwards all packets.
Note
Examples
This example shows how to apply a MAC extended ACL named macacl2 to an interface:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mac access-group macacl2 inYou can verify your settings by entering the show mac access-group privileged EXEC command. You can see configured ACLs on the switch by entering the show access-lists privileged EXEC command.
Related Commands
Displays the ACLs configured on the switch.
Displays the MAC ACLs configured on the switch.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
mac access-list extended
Use the mac access-list extended global configuration command to create an access list based on MAC addresses for non-IP traffic. Using this command puts you in the extended MAC access-list configuration mode. Use the no form of this command to return to the default setting.
mac access-list extended name
no mac access-list extended name
Syntax Description
Defaults
By default, there are no MAC access lists created.
Command Modes
Global configuration
Command History
Usage Guidelines
MAC named extended lists are used with VLAN maps and class maps.
You can apply named MAC extended ACLs to VLAN maps or to Layer 2 interfaces.
Entering the mac access-list extended command enables the MAC access-list configuration mode. These configuration commands are available:
•
•
•
•
•
Note
Examples
This example shows how to create a MAC named extended access list named mac1 and to enter extended MAC access-list configuration mode:
Switch(config)# mac access-list extended mac1Switch(config-ext-macl)#This example shows how to delete MAC named extended access list mac1:
Switch(config)# no mac access-list extended mac1You can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
deny (MAC access-list configuration)
Configures the MAC ACL (in extended MAC-access list configuration mode).
Displays the access lists configured on the switch.
Defines a VLAN map and enters access-map configuration mode where you can specify a MAC ACL to match and the action to be taken.
mac address-table aging-time
Use the mac address-table aging-time global configuration command to set the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated. Use the no form of this command to return to the default setting. The aging time applies to all VLANs or a specified VLAN.
mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]
no mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]
Syntax DescriptionI
Defaults
The default is 300 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
If hosts do not send continuously, increase the aging time to record the dynamic entries for a longer time. Increasing the time can reduce the possibility of flooding when the hosts send again.
If you do not specify a specific VLAN, this command sets the aging time for all VLANs.
Examples
This example shows how to set the aging time to 200 seconds for all VLANs:
Switch(config)# mac address-table aging-time 200You can verify your setting by entering the show mac address-table aging-time privileged EXEC command.
Related Commands
mac address-table notification
Use the mac address-table notification global configuration command to enable the MAC address notification feature on the switch. Use the no form of this command to return to the default setting.
mac address-table notification [history-size value] | [interval value]
no mac address-table notification [history-size | interval]
Syntax Description
Defaults
By default, the MAC address notification feature is disabled.
The default trap interval value is 1 second.
The default number of entries in the history table is 1.
Command Modes
Global configuration
Command History
Usage Guidelines
Whenever a new MAC address is added or an old address is deleted from the forwarding tables, the MAC address notification feature sends Simple Network Management Protocol (SNMP) traps to a network management system (NMS). MAC notifications are generated only for dynamic and secure MAC addresses. Events are not generated for self addresses, multicast addresses, or other static addresses.
When you configure the history-size option, the existing MAC address history table is deleted, and a new table is created.
You enable the MAC address notification feature by using the mac address-table notification command. You must also enable MAC address notification traps on an interface by using the snmp trap mac-notification interface configuration command and configure the switch to send MAC address traps to the NMS by using the snmp-server enable traps mac-notification global configuration command.
Examples
This example shows how to enable the MAC address-table notification feature, set the interval time to 60 seconds, and set the history-size to 100 entries:
Switch(config)# mac address-table notificationSwitch(config)# mac address-table notification interval 60Switch(config)# mac address-table notification history-size 100You can verify your settings by entering the show mac address-table notification privileged EXEC command.
Related Commands
clear mac address-table notification
Clears the MAC address notification global counters.
Displays the MAC address notification settings on all interfaces or on the specified interface.
Sends the SNMP MAC notification traps when the mac-notification keyword is appended.
Enables the SNMP MAC notification trap on a specific interface.
mac address-table static
Use the mac address-table static global configuration command to add static addresses to the MAC address table. Use the no form of this command to remove static entries from the table.
mac address-table static mac-addr vlan vlan-id interface interface-id
no mac address-table static mac-addr vlan vlan-id [interface interface-id]
Syntax Description
Defaults
No static addresses are configured.
Command Modes
Global configuration
Command History
Examples
This example shows how to add the static address c2f3.220a.12f4 to the MAC address table. When a packet is received in VLAN 4 with this MAC address as its destination, the packet is forwarded to the specified interface:
Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 interface gigabitethernet0/1You can verify your setting by entering the show mac address-table privileged EXEC command.
Related Commands
mac address-table static drop
Use the mac address-table static drop global configuration command to enable unicast MAC address filtering and to configure the switch to drop traffic with a specific source or destination MAC address. Use the no form of this command to return to the default setting.
mac address-table static mac-addr vlan vlan-id drop
no mac address-table static mac-addr vlan vlan-id
Syntax Description
Defaults
Unicast MAC address filtering is disabled. The switch does not drop traffic for specific source or destination MAC addresses.
Command Modes
Global configuration
Command History
Usage Guidelines
Follow these guidelines when using this feature:
•
•
For example, if you enter the mac address-table static mac-addr vlan vlan-id interface interface-id global configuration command followed by the mac address-table static mac-addr vlan vlan-id drop command, the switch drops packets with the specified MAC address as a source or destination.
If you enter the mac address-table static mac-addr vlan vlan-id drop global configuration command followed by the mac address-table static mac-addr vlan vlan-id interface interface-id command, the switch adds the MAC address as a static address.
Examples
This example shows how to enable unicast MAC address filtering and to configure the switch to drop packets that have a source or destination address of c2f3.220a.12f4. When a packet is received in VLAN 4 with this MAC address as its source or destination, the packet is dropped:
Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 dropThis example shows how to disable unicast MAC address filtering:
Switch(config)# no mac address-table static c2f3.220a.12f4 vlan 4You can verify your setting by entering the show mac address-table static privileged EXEC command.
Related Commands
macro apply
Use the macro apply interface configuration command to apply a macro to an interface or to apply and trace a macro configuration on an interface.
macro {apply | trace} macro-name [parameter {value}] [parameter {value}]
[parameter {value}]Syntax Description
Defaults
This command has no default setting.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can use the macro trace macro-name interface configuration command to apply and show the macros running on an interface or to debug the macro to find any syntax or configuration errors.
If a command fails because of a syntax error or a configuration error when you apply a macro, the macro continues to apply the remaining commands to the interface.
When creating a macro that requires the assignment of unique values, use the parameter value keywords to designate values specific to the interface.
Keyword matching is case sensitive. All matching occurrences of the keyword are replaced with the corresponding value. Any full match of a keyword, even if it is part of a larger string, is considered a match and is replaced by the corresponding value.
Some macros might contain keywords that require a parameter value. You can use the macro apply macro-name ? command to display a list of any required values in the macro. If you apply a macro without entering the keyword values, the commands are invalid and are not applied.
When you apply a macro to an interface, the macro name is automatically added to the interface. You can display the applied commands and macro names by using the show running-configuration interface interface-id user EXEC command.
A macro applied to an interface range behaves the same way as a macro applied to a single interface. When you use an interface range, the macro is applied sequentially to each interface within the range. If a macro command fails on one interface, it is still applied to the remaining interfaces.
You can delete a macro-applied configuration on an interface by entering the default interface interface-id interface configuration command.
Examples
After you have created a macro by using the macro name global configuration command, you can apply it to an interface. This example shows how to apply a user-created macro called duplex to an interface:
Switch(config-if)# macro apply duplexTo debug a macro, use the macro trace interface configuration command to find any syntax or configuration errors in the macro as it is applied to an interface. This example shows how troubleshoot the user-created macro called duplex on an interface:
Switch(config-if)# macro trace duplexApplying command...`duplex auto'%Error Unknown error.Applying command...`speed nonegotiate'Related Commands
macro description
Use the macro description interface configuration command to enter a description about which macros are applied to an interface. Use the no form of this command to remove the description.
macro description text
no macro description text
Syntax Description
Defaults
This command has no default setting.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use the description keyword to associate comment text, or the macro name, with an interface. When multiple macros are applied on a single interface, the description text will be from the last applied macro.
This example shows how to add a description to an interface:
Switch(config-if)# macro description duplex settingsYou can verify your settings by entering the show parser macro description privileged EXEC command.
Related Commands
macro global
Use the macro global global configuration command to apply a macro to a switch or to apply and trace a macro configuration on a switch.
macro global {apply | trace} macro-name [parameter {value}] [parameter {value}]
[parameter {value}]Syntax Description
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
You can use the macro trace macro-name global configuration command to apply and to show the macros running on a switch or to debug the macro to find any syntax or configuration errors.
If a command fails because of a syntax error or a configuration error when you apply a macro, the macro continues to apply the remaining commands to the switch.
When creating a macro that requires the assignment of unique values, use the parameter value keywords to designate values specific to the switch.
Keyword matching is case sensitive. All matching occurrences of the keyword are replaced with the corresponding value. Any full match of a keyword, even if it is part of a larger string, is considered a match and is replaced by the corresponding value.
Some macros might contain keywords that require a parameter value. You can use the macro global apply macro-name ? command to display a list of any required values in the macro. If you apply a macro without entering the keyword values, the commands are invalid and are not applied.
When you apply a macro to a switch, the macro name is automatically added to the switch. You can display the applied commands and macro names by using the show running-configuration user EXEC command.
You can delete a global macro-applied configuration on a switch only by entering the no version of each command contained in the macro.
Examples
After you have created a new macro by using the macro name global configuration command, you can apply it to a switch. This example shows how see the snmp macro and how to apply the macro and set the hostname to test-server and set the IP precedence value to 7:
Switch# show parser macro name snmpMacro name : snmpMacro type : customizable#enable port security, linkup, and linkdown trapssnmp-server enable traps port-securitysnmp-server enable traps linkupsnmp-server enable traps linkdown#set snmp-server hostsnmp-server host ADDRESS#set SNMP trap notifications precedencesnmp-server ip precedence VALUE--------------------------------------------------Switch(config)# macro global apply snmp ADDRESS test-server VALUE 7To debug a macro, use the macro global trace global configuration command to find any syntax or configuration errors in the macro when it is applied to a switch. In this example, the ADDRESS parameter value was not entered, causing the snmp-server host command to fail while the remainder of the macro is applied to the switch:
Switch(config)# macro global trace snmp VALUE 7Applying command...`snmp-server enable traps port-security'Applying command...`snmp-server enable traps linkup'Applying command...`snmp-server enable traps linkdown'Applying command...`snmp-server host'%Error Unknown error.Applying command...`snmp-server ip precedence 7'Related Commands
macro global description
Use the macro global description global configuration command to enter a description about the macros that are applied to the switch. Use the no form of this command to remove the description.
macro global description text
no macro global description text
Syntax Description
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
Use the description keyword to associate comment text, or the macro name, with a switch. When multiple macros are applied on a switch, the description text will be from the last applied macro.
This example shows how to add a description to a switch:
Switch(config)# macro global description udld aggressive mode enabledYou can verify your settings by entering the show parser macro description privileged EXEC command.
Related Commands
macro name
Use the macro name global configuration command to create a configuration macro. Use the no form of this command to delete the macro definition.
macro name macro-name
no macro name macro-name
Syntax Description
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
A macro can contain up to 3000 characters. Enter one macro command per line. Use the @ character to end the macro. Use the # character at the beginning of a line to enter comment text within the macro.
You can define mandatory keywords within a macro by using a help string to specify the keywords. Enter # macro keywords word to define the keywords that are available for use with the macro. You can enter up to three help string keywords separated by a space. If you enter more than three macro keywords, only the first three are shown.
Macro names are case sensitive. For example, the commands macro name Sample-Macro and macro name sample-macro will result in two separate macros.
When creating a macro, do not use the exit or end commands or change the command mode by using interface interface-id. This could cause commands that follow exit, end, or interface interface-id to execute in a different command mode.
The no form of this command only deletes the macro definition. It does not affect the configuration of those interfaces on which the macro is already applied. You can delete a macro-applied configuration on an interface by entering the default interface interface-id interface configuration command. Alternatively, you can create an anti-macro for an existing macro that contains the no form of all the corresponding commands in the original macro. Then apply the anti-macro to the interface.
You can modify a macro by creating a new macro with the same name as the existing macro. The newly created macro overwrites the existing macro but does not affect the configuration of those interfaces on which the original macro was applied.
Examples
This example shows how to create a macro that defines the duplex mode and speed:
Switch(config)# macro name duplexEnter macro commands one per line. End with the character `@'.duplex fullspeed auto@This example shows how create a macro with # macro keywords:
Switch(config)# macro name testswitchport access vlan $VLANIDswitchport port-security maximum $MAX#macro keywords $VLANID $MAX@This example shows how to display the mandatory keyword values before you apply the macro to an interface:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# macro apply test ?WORD keyword to replace with a value e.g $VLANID,$MAX<cr>Switch(config-if)# macro apply test $VLANID ?WORD Value of first keyword to replaceSwitch(config-if)# macro apply test $VLANID 2WORD keyword to replace with a value e.g $VLANID,$MAX<cr>Switch(config-if)# macro apply test $VLANID 2 $MAX ?WORD Value of second keyword to replaceRelated Commands
match (access-map configuration)
Use the match access-map configuration command to set the VLAN map to match packets against one or more access lists. Use the no form of this command to remove the match parameters.
match {ip address {name | number} [name | number] [name | number]...} | {mac address {name} [name] [name]...}
no match {ip address {name | number} [name | number] [name | number]...} | {mac address {name} [name] [name]...}
Syntax Description
Defaults
The default action is to have no match parameters applied to a VLAN map.
Command Modes
Access-map configuration
Command History
Usage Guidelines
You enter access-map configuration mode by using the vlan access-map global configuration command.
You must enter one access list name or number; others are optional. You can match packets against one or more access lists. Matching any of the lists counts as a match of the entry.
In access-map configuration mode, use the match command to define the match conditions for a VLAN map applied to a VLAN. Use the action command to set the action that occurs when the packet matches the conditions.
Packets are matched only against access lists of the same protocol type; IP packets are matched against IP access lists, and all other packets are matched against MAC access lists.
Both IP and MAC addresses can be specified for the same map entry.
Examples
This example shows how to define and apply a VLAN access map vmap4 to VLANs 5 and 6 that will cause the interface to drop an IP packet if the packet matches the conditions defined in access list al2.
Switch(config)# vlan access-map vmap4Switch(config-access-map)# match ip address al2Switch(config-access-map)# action dropSwitch(config-access-map)# exitSwitch(config)# vlan filter vmap4 vlan-list 5-6You can verify your settings by entering the show vlan access-map privileged EXEC command.
Related Commands
match access-group
Use the match access-group class-map configuration command to configure the match criteria for a class map on the basis of the specified access control list (ACL). Use the no form of this command to remove the ACL match criteria.
match access-group acl-index-or-name
no match access-group acl-index-or-name
Syntax Description
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
The match access-group command specifies a numbered or named ACL to use as the match criteria to determine if packets belong to the class specified by the class map.
Before using the match access-group command, you must enter the class-map global configuration command to specify the name of the class whose match criteria you want to establish.
You can use the match access-group classification only on input policy maps.
Examples
This example shows how to create a class map called inclass, which uses the access control list acl1 as the match criterion:
Switch(config)# class-map match-any inclassSwitch(config-cmap)# match access-group acl1Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Displays quality of service (QoS) class maps.
match cos
Use the match cos class-map configuration command to match a packet based on a Layer 2 class of service (CoS) marking. Use the no form of this command to remove the CoS match criteria.
match cos cos-list |
no match cos cos-list
Syntax Description
cos-list
List of up to four CoS values to match against incoming packets. Separate each value with a space. The range is 0 to 7.
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
The match cos command specifies a CoS value to use as the match criteria to determine if packets belong to the class specified by the class map.
Before using the match cos command, you must enter the class-map global configuration command to specify the name of the class whose match criteria you want to establish.
Matching of CoS values is supported only on ports carrying Layer 2 VLAN-tagged traffic. That is, you can use the cos classification only on IEEE 802.1Q trunk ports.
You can use match cos classification in input and output policy maps.
Examples
This example shows how to create a class map called inclass, which matches all the incoming traffic with CoS values of 1 and 4:
Switch(config)# class-map match-any in-classSwitch(config-cmap)# match cos 1 4Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Displays quality of service (QoS) class maps.
match ip dscp
Use the match ip dscp class-map configuration command to identify a specific IPv4 Differentiated Service Code Point (DSCP) value as match criteria for a class. Use the no form of this command to remove the match criteria.
match ip dscp dscp-list
no match ip dscp dscp-list
Syntax Description
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
The match ip dscp command specifies a DSCP value to use as the match criteria to determine if packets belong to the class specified by the class map.
This command is used by the class map to identify a specific DSCP value marking on a packet. In this context, DSCP values are used as markings only and have no mathematical significance. For example, the DSCP value of 2 is not greater than 1, but merely indicates that a packet marked with a value of 2 is different than one marked with a value of 1. You define the treatment of these marked packets by setting QoS policies in policy-map class configuration mode.
Before using the match ip dscp command, you must enter the class-map global configuration command to specify the name of the class whose match criteria you want to establish.
You can enter up to eight DSCP values in one match statement. For example, if you wanted the DCSP values of 0, 1, 2, 3, 4, 5, 6, or 7, enter the match ip dscp 0 1 2 3 4 5 6 7 command. The packet must match only one (not all) of the specified IPv4 DSCP values to belong to the class.
You can use match ip dscp classification in input and output policy maps.
Examples
This example shows how to create a class map called inclass, which matches all the incoming traffic with DSCP values of 10, 11, and 12:
Switch(config)# class-map match-any in-classSwitch(config-cmap)# match ip dscp 10 11 12Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Displays quality of service (QoS) class maps.
match ip precedence
Use the match ip precedence class-map configuration command to identify IPv4 precedence values as match criteria for a class. Use the no form of this command to remove the match criteria.
match ip precedence ip-precedence-list
no match ip precedence ip-precedence-list
Syntax Description
ip precedence ip-precedence-list
List of up to four IPv4 precedence values to match against incoming packets. Separate each value with a space. The range is 0 to 7.
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
The match ip precedence command specifies an IPv4 precedence value to use as the match criteria to determine if packets belong to the class specified by the class map.
The precedence values are used as marking only. In this context, the IP precedence values have no mathematical significance. For example, the precedence value of 2 is not greater than 1, but merely indicates that a packet marked with a value of 2 is different than one marked with a value of 1. You define the treatment of these marked packets by setting QoS policies in policy-map class configuration mode.
Before using the match ip precedence command, you must enter the class-map global configuration command to specify the name of the class whose match criteria you want to establish.
You can enter up to four IPv4 precedence values in one match statement. For example, if you wanted the IP precedence values of 0, 1, 2, or 7, enter the match ip precedence 0 1 2 7 command. The packet must match only one (not all) of the specified IP precedence values to belong to the class.
You can use match ip precedence classification in input and output policy maps.
Examples
This example shows how to create a class map called class, which matches all the incoming traffic with IP-precedence values of 5, 6, and 7:
Switch(config)# class-map match-any in-classSwitch(config-cmap)# match ip precedence 5 6 7Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Displays quality of service (QoS) class maps.
match qos-group
Use the match qos-group class-map configuration command to identify a specific quality of service (QoS) group value as a match criterion for a class. Use the no form of this command to remove the match criterion.
match qos-group value
no match qos-group value
Syntax Description
Defaults
No match criterion are defined.
Command Modes
Class-map configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
The QoS group range was extended to from 0 to 99.
Usage Guidelines
The match qos-group command specifies a QoS group value to use as the match criterion to determine if packets belong to the class specified by the class map.
The QoS-group values are used as marking only and have no mathematical significance. For example, the precedence value of 2 is not greater than 1, but merely indicates that a packet marked with a value of 2 is different than one marked with a value of 1. You define the treatment of these marked packets by setting QoS policies in policy-map class configuration mode.
The QoS-group value is local to the switch, meaning that the QoS-group value marked on a packet does not leave the switch when the packet leaves the switch. If you require a marking that remains with the packet, use IP Differentiated Service Code Point (DSCP) values, IP precedence values, or another method of packet marking.
Before using the match qos-group command, you must enter the class-map global configuration command to specify the name of the class whose match criteria you want to establish.
You can use the match qos-group classification only on output policy maps.
There can be no more than 100 QoS groups on the switch (0 to 99).
Examples
This example shows how to classify traffic by using QoS group 13 as the match criterion:
Switch(config)# class-map match-any inclassSwitch(config-cmap)# match qos-group 13Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Displays QoS class maps.
mdix auto
Use the mdix auto interface configuration command to enable the automatic medium-dependent interface crossover (auto-MDIX) feature on the interface. When auto-MDIX is enabled, the interface automatically detects the required cable connection type (straight-through or crossover) and configures the connection appropriately. Use the no form of this command to disable auto-MDIX.
mdix auto
no mdix auto
Syntax Description
This command has no arguments or keywords.
Defaults
Auto-MDIX is enabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
When you enable auto-MDIX on an interface, you must also set the speed and duplex on the interface to auto so that the feature operates correctly. If the port is a user network interface (UNI) or enhanced network interfaces (ENI), you must use the no shutdown interface configuration command to enable it before using the mdix auto command. UNIs and ENIs are disabled by default. Network node interfaces (NNIs) are enabled by default.
When auto-MDIX (along with autonegotiation of speed and duplex) is enabled on one or both of connected interfaces, link up occurs, even if the required cable type (straight-through or crossover) is not present.
Auto-MDIX is supported on all 10/100-Mbps interfaces and on 10/100/1000BASE-T/BASE-TX small form-factor pluggable (SFP)-module interfaces. It is not supported on 1000BASE-SX or -LX SFP module interfaces.
Examples
This example shows how to enable auto-MDIX on a port:
Switch# configure terminalSwitch(config)# interface gigabitethernet0/1Switch(config-if)# speed autoSwitch(config-if)# duplex autoSwitch(config-if)# mdix autoSwitch(config-if)# endYou can verify the operational state of auto-MDIX on the interface by entering the show controllers ethernet-controller interface-id phy privileged EXEC command.
Related Commands
show controllers ethernet-controller interface-id phy
Displays general information about internal registers of an interface, including the operational state of auto-MDIX.
monitor session
Use the monitor session global configuration command to start a new Switched Port Analyzer (SPAN) session or Remote SPAN (RSPAN) source or destination session, to enable incoming traffic on the destination port for a network security device (such as a Cisco IDS Sensor Appliance), to add or delete interfaces or VLANs to or from an existing SPAN or RSPAN session, and to limit (filter) SPAN source traffic to specific VLANs. Use the no form of this command to remove the SPAN or RSPAN session or to remove source or destination interfaces or filters from the SPAN or RSPAN session. For destination interfaces, the encapsulation dot1q or encapsulation replicate keywords are ignored with the no form of the command.
monitor session session_number destination {interface interface-id [, | -] [encapsulation {dot1q | replicate}] [ingress {[dot1q | untagged] vlan vlan-id}] | {remote vlan vlan-id}
monitor session session_number filter vlan vlan-id [, | -]
monitor session session_number source {interface interface-id [, | -] [both | rx | tx]} | {vlan vlan-id [, | -] [both | rx | tx]}| {remote vlan vlan-id}
no monitor session {session_number | all | local | remote}
no monitor session session_number destination {interface interface-id [, | -] [encapsulation {dot1q | replicate}] [ingress {[dot1q | untagged] vlan vlan-id}] | {remote vlan vlan-id}
no monitor session session_number filter vlan vlan-id [, | -]
no monitor session session_number source {interface interface-id [, | -] [both | rx | tx]} | {vlan vlan-id [, | -] [both | rx | tx]} | {remote vlan vlan-id}
Syntax Description
Defaults
No monitor sessions are configured.
On a source interface, the default is to monitor both received and transmitted traffic.
On a trunk interface used as a source port, all VLANs are monitored.
If encapsulation dot1q or encapsulation replicate is not specified on a local SPAN destination port, packets are sent in native form with no encapsulation tag.
Ingress forwarding is disabled on destination ports.
Command Modes
Global configuration
Command History
Usage Guidelines
Traffic that enters or leaves source ports or source VLANs can be monitored by using SPAN or RSPAN. Traffic routed to source ports or source VLANs cannot be monitored.
You can set a combined maximum of two local SPAN sessions and RSPAN source sessions. You can have a total of 66 SPAN and RSPAN sessions on a switch.
You can have a maximum of 64 destination ports on a switch.
Each session can include multiple ingress or egress source ports or VLANs, but you cannot combine source ports and source VLANs in a single session. Each session can include multiple destination ports.
When you use VLAN-based SPAN (VSPAN) to analyze network traffic in a VLAN or set of VLANs, all active ports in the source VLANs become source ports for the SPAN or RSPAN session. Trunk ports are included as source ports for VSPAN, and only packets with the monitored VLAN ID are sent to the destination port.
You can monitor traffic on a single port or VLAN or on a series or range of ports or VLANs. You select a series or range of interfaces or VLANs by using the [, | -] options.
If you specify a series of VLANs or interfaces, you must enter a space before and after the comma. If you specify a range of VLANs or interfaces, you must enter a space before and after the hyphen (-).
EtherChannel ports cannot be configured as SPAN or RSPAN destination ports. A physical port that is a member of an EtherChannel group can be used as a destination port, but it cannot participate in the EtherChannel group while it is as a SPAN destination.
A private-VLAN port cannot be configured as a SPAN destination port.
You can monitor individual ports while they participate in an EtherChannel, or you can monitor the entire EtherChannel bundle by specifying the port-channel number as the RSPAN source interface.
A port used as a destination port cannot be a SPAN or RSPAN source, nor can a port be a destination port for more than one session at a time.
You can enable IEEE 802.1x on a port that is a SPAN or RSPAN destination port; however, IEEE 802.1x is disabled until the port is removed as a SPAN destination. (If IEEE 802.1x is not available on the port, the switch returns an error message.) You can enable IEEE 802.1x on a SPAN or RSPAN source port.
VLAN filtering refers to analyzing network traffic on a selected set of VLANs on trunk source ports. By default, all VLANs are monitored on trunk source ports. You can use the monitor session session_number filter vlan vlan-id command to limit SPAN traffic on trunk source ports to only the specified VLANs.
VLAN monitoring and VLAN filtering are mutually exclusive. If a VLAN is a source, VLAN filtering cannot be enabled. If VLAN filtering is configured, a VLAN cannot become a source.
If ingress traffic forwarding is enabled for a network security device, the destination port forwards traffic at Layer 2.
Destination ports can be configured to act in these ways:
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•
•
•
Examples
This example shows how to create a local SPAN session 1 to monitor both sent and received traffic on source port 1 to destination port 2:
Switch(config)# monitor session 1 source interface gigabitethernet0/1 bothSwitch(config)# monitor session 1 destination interface gigabitethernet0/2This example shows how to delete a destination port from an existing local SPAN session:
Switch(config)# no monitor session 2 destination gigabitethernet0/2This example shows how to limit SPAN traffic in an existing session only to specific VLANs:
Switch(config)# monitor session 1 filter vlan 100 - 110This example shows how to configure RSPAN source session 1 to monitor multiple source interfaces and to configure the destination RSPAN VLAN 900.
Switch(config)# monitor session 1 source interface gigabitethernet0/1Switch(config)# monitor session 1 source interface port-channel 2 txSwitch(config)# monitor session 1 destination remote vlan 900Switch(config)# endThis example shows how to configure an RSPAN destination session 10 in the switch receiving the monitored traffic.
Switch(config)# monitor session 10 source remote vlan 900Switch(config)# monitor session 10 destination interface gigabitethernet0/2This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that supports IEEE 802.1Q encapsulation. Egress traffic replicates the source; ingress traffic uses IEEE 802.1Q encapsulation.
Switch(config)# monitor session 2 destination interface gigabitethernet0/2 encapsulation replicate ingress dot1q vlan 5This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that does not support encapsulation. Egress traffic and ingress traffic are untagged.
Switch(config)# monitor session 2 destination interface gigabitethernet0/2 ingress untagged vlan 5You can verify your settings by entering the show monitor privileged EXEC command. You can display SPAN and RSPAN configuration on the switch by entering the show running-config privileged EXEC command. SPAN information appears near the end of the output.
Related Commands
Configures an RSPAN VLAN in vlan configuration mode.
Displays SPAN and RSPAN session information.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
mvr (global configuration)
Use the mvr global configuration command without keywords to enable the multicast VLAN registration (MVR) feature on the switch. Use the command with keywords to set the MVR mode for a switch, configure the MVR IP multicast address, set the maximum time to wait for a query reply before removing a port from group membership, and to specify the MVR multicast VLAN. Use the no form of this command to return to the default settings.
mvr [group ip-address [count] | mode [compatible | dynamic] | querytime value | vlan vlan-id]
no mvr [group ip-address | mode [compatible | dynamic] | querytime value | vlan vlan-id]
Syntax Description
Defaults
MVR is disabled by default.
The default MVR mode is compatible mode.
No IP multicast addresses are configured on the switch by default.
The default group ip address count is 0.
The default query response time is 5 tenths of or one-half second.
The default multicast VLAN for MVR is VLAN 1.
Command Modes
Global configuration
Command History
Usage Guidelines
A maximum of 256 MVR multicast groups can be configured on a switch.
Use the mvr group command to statically set up all the IP multicast addresses that will take part in MVR. Any multicast data sent to a configured multicast address is sent to all the source ports on the switch and to all receiver ports that have registered to receive data on that IP multicast address.
MVR supports aliased IP multicast addresses on the switch. However, if the switch is interoperating with Catalyst 3550 or Catalyst 3500 XL switches, you should not configure IP addresses that alias between themselves or with the reserved IP multicast addresses (in the range 224.0.0.xxx).
The mvr querytime command applies only to receiver ports.
If the switch MVR is interoperating with Catalyst 2900 XL or Catalyst 3500 XL switches, set the multicast mode to compatible.
When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
MVR can coexist with IGMP snooping on a switch.
Examples
This example shows how to enable MVR:
Switch(config)# mvrUse the show mvr privileged EXEC command to display the current setting for maximum multicast groups.
This example shows how to configure 228.1.23.4 as an IP multicast address:
Switch(config)# mvr group 228.1.23.4This example shows how to configure ten contiguous IP multicast groups with multicast addresses from 228.1.23.1 to 228.1.23.10:
Switch(config)# mvr group 228.1.23.1 10Use the show mvr members privileged EXEC command to display the IP multicast group addresses configured on the switch.
This example shows how to set the maximum query response time as one second (10 tenths):
Switch(config)# mvr querytime 10This example shows how to set VLAN 2 as the multicast VLAN:
Switch(config)# mvr vlan 2You can verify your settings by entering the show mvr privileged EXEC command.
Related Commands
mvr (interface configuration)
Use the mvr interface configuration command to configure a Layer 2 port as a multicast VLAN registration (MVR) receiver or source port, to set the Immediate Leave feature, and to statically assign a port to an IP multicast VLAN and IP address. Use the no form of this command to return to the default settings.
mvr {immediate | type {receiver | source} | vlan vlan-id {[group ip-address] [receiver vlan vlan-id]}}
no mvr {immediate | type {receiver | source} | vlan vlan-id {[group ip-address] [receiver vlan vlan-id]}}
Syntax Description
Defaults
A port is configured as neither a receiver nor a source.
The Immediate Leave feature is disabled on all ports.
No receiver port is a member of any configured multicast group.
Command Modes
Interface configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SE
The receiver and vlan-id keywords were added. These are required to configure a trunk port as an MVR receiver port.
Usage Guidelines
Configure a port as a source port if that port should be able to both send and receive multicast data bound for the configured multicast groups. Multicast data is received on all ports configured as source ports.
Receiver ports on a switch can be in different VLANs, but should not belong to the multicast VLAN.
A port that is not taking part in MVR should not be configured as an MVR receiver port or a source port. A non-MVR port is a normal switch port, able to send and receive multicast data with normal switch behavior.
When Immediate Leave is enabled, a receiver port leaves a multicast group more quickly. Without Immediate Leave, when the switch receives an IGMP leave message from a group on a receiver port, it sends out an IGMP MAC-based query on that port and waits for IGMP group membership reports. If no reports are received in a configured time period, the receiver port is removed from multicast group membership. With Immediate Leave, an IGMP MAC-based query is not sent from the receiver port on which the IGMP leave was received. As soon as the leave message is received, the receiver port is removed from multicast group membership, which speeds up leave latency.
The Immediate Leave feature should be enabled only on receiver ports to which a single receiver device is connected.
The mvr vlan group command statically configures ports to receive multicast traffic sent to the IP multicast address. A port statically configured as a member of group remains a member of the group until statically removed. In compatible mode, this command applies only to receiver ports; in dynamic mode, it can also apply to source ports. Receiver ports can also dynamically join multicast groups by using IGMP join messages.
When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
An MVR port cannot be a private-VLAN port.
Examples
This example shows how to configure a port as an MVR receiver port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mvr type receiverUse the show mvr interface privileged EXEC command to display configured receiver ports and source ports.
This example shows how to enable Immediate Leave on a port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mvr immediateThis example shows how to add a port on VLAN 1 as a static member of IP multicast group 228.1.23.4:
Switch(config)# interface gigabitethernet0/2Switch(config-if)# mvr vlan1 group 230.1.23.4This example shows how to add a port 2 on VLAN 100 as a static member of IP multicast group 228.1.23.4. In this example, the receive port is an access port:
Switch(config)# interface gigabitethernet0/2Switch(config-if)# mvr vlan 100 group 228.1.23.4This example shows how to add on port 5 the receiver VLAN 201 with an MVR VLAN of 100.
Switch(config)# interface fastethernet0/5Switch(config-if)# mvr vlan 100 receiver vlan 201This example shows how to add on port 5 the receiver VLAN 201 as a static member of the IP multicast group 239.1.1.1, with an MVR VLAN of 100:
Switch(config)# interface fastethernet0/5Switch(config-if)# mvr vlan 100 group 239.1.1.1 receiver vlan 201You can verify your settings by entering the show mvr members privileged EXEC command.
Related Commands
pagp learn-method
Use the pagp learn-method interface configuration command to learn the source address of incoming packets received from an EtherChannel port. Use the no form of this command to return to the default setting.
pagp learn-method {aggregation-port | physical-port}
no pagp learn-method
Note
Syntax Description
Defaults
The default is aggregation-port (logical port channel).
Command Modes
Interface configuration
Command History
Usage Guidelines
If the interface is a user network interface (UNI), you must enter the port-type nni or port-type eni interface configuration command before configuring pagp learn-method. Learn must be configured to the same method at both ends of the link.
Note
Note
Examples
This example shows how to set the learning method to learn the address on the physical port within the EtherChannel:
Switch(config-if)# pagp learn-method physical-portThis example shows how to set the learning method to learn the address on the port-channel within the EtherChannel:
Switch(config-if)# pagp learn-method aggregation-portYou can verify your settings by entering the show running-config privileged EXEC command or the show pagp channel-group-number internal privileged EXEC command.
Related Commands
Selects a port over which all traffic through the EtherChannel is sent.
Displays PAgP channel-group information.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
pagp port-priority
Use the pagp port-priority interface configuration command to select a port over which all Port Aggregation Protocol (PAgP) traffic through the EtherChannel is sent. If all unused ports in the EtherChannel are in hot-standby mode, they can be placed into operation if the currently selected port and link fails. Use the no form of this command to return to the default setting.
pagp port-priority priority
no pagp port-priority
Note
Syntax Description
Defaults
The default is 128.
Command Modes
Interface configuration
Command History
Usage Guidelines
If the interface is a user network interface (UNI), you must enter the port-type nni or port-type eni interface configuration command before configuring pagp port-priority.
The physical port with the highest operational priority and that has membership in the same EtherChannel is the one selected for PAgP transmission.
Note
When the link partner to the Cisco ME switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command. Use the pagp learn-method interface configuration command only in this situation.Examples
This example shows how to set the port priority to 200:
Switch(config-if)# pagp port-priority 200You can verify your setting by entering the show running-config privileged EXEC command or the show pagp channel-group-number internal privileged EXEC command.
Related Commands
Provides the ability to learn the source address of incoming packets.
Displays PAgP channel-group information.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
permit (ARP access-list configuration)
Use the permit Address Resolution Protocol (ARP) access-list configuration command to permit an ARP packet based on matches against the Dynamic Host Configuration Protocol (DHCP) bindings. Use the no form of this command to remove the specified access control entry (ACE) from the access control list.
permit {[request] ip {any | host sender-ip | sender-ip sender-ip-mask} mac {any | host sender-mac | sender-mac sender-mac-mask} | response ip {any | host sender-ip | sender-ip sender-ip-mask} [{any | host target-ip | target-ip target-ip-mask}] mac {any | host sender-mac | sender-mac sender-mac-mask} [{any | host target-mac | target-mac target-mac-mask}]} [log]
no permit {[request] ip {any | host sender-ip | sender-ip sender-ip-mask} mac {any | host sender-mac | sender-mac sender-mac-mask} | response ip {any | host sender-ip | sender-ip sender-ip-mask} [{any | host target-ip | target-ip target-ip-mask}] mac {any | host sender-mac | sender-mac sender-mac-mask} [{any | host target-mac | target-mac target-mac-mask}]} [log]
Syntax Description
request
(Optional) Requests a match for the ARP request. When request is not specified, matching is performed against all ARP packets.
ip
Specify the sender IP address.
any
Accept any IP or MAC address.
host sender-ip
Accept the specified sender IP address.
sender-ip sender-ip-mask
Accept the specified range of sender IP addresses.
mac
Specify the sender MAC address.
host sender-mac
Accept the specified sender MAC address.
sender-mac sender-mac-mask
Accept the specified range of sender MAC addresses.
response ip
Define the IP address values for the ARP responses.
host target-ip
(Optional) Accept the specified target IP address.
target-ip target-ip-mask
(Optional) Accept the specified range of target IP addresses.
mac
Specify the MAC address values for the ARP responses.
host target-mac
(Optional) Accept the specified target MAC address.
target-mac target-mac-mask
(Optional) Accept the specified range of target MAC addresses.
log
(Optional) Log a packet when it matches the ACE. Matches are logged if you also configure the matchlog keyword in the ip arp inspection vlan logging global configuration command.
Defaults
There are no default settings.
Command Modes
ARP access-list configuration
Command History
Usage Guidelines
You can add permit clauses to forward ARP packets based on some matching criteria.
Examples
This example shows how to define an ARP access list and to permit both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd:
Switch(config)# arp access-list static-hostsSwitch(config-arp-nacl)# permit ip host 1.1.1.1 mac host 0000.0000.abcdSwitch(config-arp-nacl)# endYou can verify your settings by entering the show arp access-list privileged EXEC command.
Related Commands
permit (MAC access-list configuration)
Use the permit MAC access-list configuration command to allow non-IP traffic to be forwarded if the conditions are matched. Use the no form of this command to remove a permit condition from the extended MAC access list.
{permit | deny} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | cos cos | aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]
no {permit | deny} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | cos cos | aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
Note
Syntax Description
To filter IPX traffic, you use the type mask or lsap lsap mask keywords, depending on the type of IPX encapsulation being used. Filter criteria for IPX encapsulation types as specified in Novell terminology and Cisco IOS terminology are listed in Table 2-3.
Defaults
This command has no defaults. However, the default action for a MAC-named ACL is to deny.
Command Modes
MAC access-list configuration
Command History
Usage Guidelines
You enter MAC access-list configuration mode by using the mac access-list extended global configuration command.
If you use the host keyword, you cannot enter an address mask; if you do not use the any or host keywords, you must enter an address mask.
After an access control entry (ACE) is added to an access control list, an implied deny-any-any condition exists at the end of the list. That is, if there are no matches, the packets are denied. However, before the first ACE is added, the list permits all packets.
Note
Examples
This example shows how to define the MAC-named extended access list to allow NETBIOS traffic from any source to MAC address 00c0.00a0.03fa. Traffic matching this list is allowed.
Switch(config-ext-macl)# permit any host 00c0.00a0.03fa netbiosThis example shows how to remove the permit condition from the MAC-named extended access list:
Switch(config-ext-macl)# no permit any 00c0.00a0.03fa 0000.0000.0000 netbiosThis example permits all packets with Ethertype 0x4321:
Switch(config-ext-macl)# permit any any 0x4321 0You can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
police
Use the police policy-map class configuration command to define an individual policer for classified traffic and to enter policy-map class police configuration mode. A policer defines a maximum permissible rate of transmission, a maximum burst size for transmissions, and an action to take if a maximum is exceeded. In policy-map class police configuration mode, you can specify multiple actions for a packet. Use the no form of this command to remove a policer.
police {cir cir-bps | rate-bps} [burst-bytes | bc [burst-value]] [conform-action [set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] [exceed action [drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]]
no police {cir cir-bps | rate-bps} [burst-bytes | bc [burst-value]] [conform-action [set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] [exceed action [drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit]]
Note
Syntax Description
Defaults
No policers are defined. Conform burst (bc) is automatically configured to 250 ms at the configured CIR.
Command Modes
Policy-map class configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
Increased support for configuring conform and exceed actions. See "Usage Guidelines."
Usage Guidelines
You can configure conform-action marking by using enhanced packet marking and configure exceed-action to send the packet unmodified, mark using explicit values, and use all combinations of enhanced packet marking. Enhanced packet marking modifies a QoS marking based on any incoming QoS marking and table maps. The switch also supports marking multiple QoS parameters for the same class and simultaneously configuring conform-action marking and exceed-action marking.
The switch supports a maximum of 229 policer instances on the switch (228 user-configurable policers and 1 policer reserved for internal use).
When CPU protection is enabled (the default), you can configure 45 ingress policers per port. If you disable CPU protection by entering the no policer cpu uni all global configuration command and reloading the switch, you can configure up to 64 ingress policers per port (63 policers on every fourth port). For more information, see the policer cpu uni command.
Policing is only supported in input policies or in output policies that were configured with the priority policy-map class configuration command to reduce bandwidth in the priority queue.
Note
An output policy map should match only the modified values of the out-of-profile traffic and not the original values.
To configure multiple conform-actions or multiple exceed-actions, enter policy-map class police configuration mode, and use the conform-action and exceed-action policy-map class police configuration commands.
When you define the policer and press Enter, you enter policy-map class police configuration mode, in which you can configure multiple policing actions:
•
•
•
•
Examples
This example shows how to configure a policer with a 1-Mbps average rate with a burst size of 20 KB. The policer sets a new DSCP precedence value if the packets conform to the rate and drops the packet if traffic exceeds the rate.
Switch(config)# policy-map policy1Switch(config-pmap)# class inclass1Switch(config-pmap-c)# police cir 1000000 20000 conform-action set-dscp-transmit 46 exceed-action dropSwitch(config-pmap-c)# exitThis example shows how to configure a policer with default actions.
Switch(config)# policy-map policy2Switch(config-pmap)# class class2Switch(config-pmap-c)# police 1000000 20000 conform-action transmit exceed-action dropSwitch(config-pmap-c)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
policer aggregate (global configuration)
Use the policer aggregate global configuration command to create an aggregate policer to police all traffic across multiple classes in an input policy map. An aggregate policer can be shared by multiple classes in the same policy map. A policer defines a maximum permissible rate of transmission or committed information rate, a maximum burst size for transmissions, and an action to take if the maximum is met or exceeded. Use the no form of this command to remove the specified policer.
policer aggregate aggregate-policer-name {rate-bps | cir cir-bps} [bc burst- value] [conform-action [set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] [exceed-action [drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] [violate]
no policer aggregate aggregate-policer-name {rate-bps | cir cir-bps} [bc burst- value] [conform-action [set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] [exceed action [drop | set-cos-transmit {new-cos-value | [cos | dscp | precedence] [table table-map name]} | set-dscp-transmit {new-dscp-value | [cos | dscp | precedence] [table table-map name]} | set-prec-transmit {new-precedence-value | [cos | dscp | precedence] [table table-map name]} | set-qos-transmit qos-group-value | transmit] ]
Syntax Description
Defaults
No aggregate policers are defined.
When you configure an aggregate policer, conform burst (bc) is automatically configured at 250 ms at the configured CIR.
Command Modes
Global configuration
Command History
12.2(25)EX
This command was introduced.
12.2(25)SEG
Increased support for configuring conform and exceed actions. See "Usage Guidelines."
Usage Guidelines
You can configure conform-action marking using enhanced packet marking and configure exceed-action to send the packet unmodified, mark using explicit values, and use all combinations of enhanced packet marking. Enhanced packet marking modifies a QoS marking based on any incoming QoS marking and table maps. The switch also supports marking multiple QoS parameters for the same class, and simultaneously configuring conform-action marking and exceed-action marking.
The switch supports a maximum of 256 unique aggregate policer.s.
Aggregate policing is supported only in input policy maps.
You can simultaneously configure multiple conform and exceed actions for an aggregate policer as parameters in the policer aggregate global configuration command, but you must enter the actions in this order:
•
set-qos-transmit
set-dscp-transmit or set-prec-transmit
set-cos-transmit
•
set-qos-transmit
set-dscp-transmit or set-prec-transmit
set-cos-transmit
An output policy map should match only the modified values of the out-of-profile traffic and not the original values.
When you configure an aggregate policer, you can configure specific burst sizes and conform and exceed actions. If burst size (bc) is not specified, the system calculates an appropriate burst size value that equals the number of bytes that can be sent in 250 ms at the CIR rate. In most cases, the automatically calculated value is appropriate; enter a new value only if you are aware of all implications.
Examples
This example shows how to configure an aggregate policer named agg-pol-1 and attach it to multiple classes within a policy map:
Switch(config)# policer aggregate agg-pol-1 10900000 80000 exceed-action dropSwitch(config)# class-map test1Switch(config-cmap)# match access-group 1Switch(config-cmap)# exitSwitch(config)# class-map test2Switch(config-cmap)# match access-group 2Switch(config-cmap)# exitSwitch(config)# policy map testexampleSwitch(config-pmap)# class test1Switch(config-pmap-c)# police aggregate agg-pol-1Switch(config-cmap-c)# exitSwitch(config-pmap)# class test2Switch(config-pmap-c)# police aggregate agg-pol-1Switch(config-pmap-c)# exitSwitch(config-9map)# exitSwitch(config)# interface fastethernet0/1Switch(config-if)# service-policy input testexampleSwitch(config-if)# exitYou can verify your settings by entering the show aggregate-policer privileged EXEC command.
Related Commands
police aggregate (policy-map class configuration)
Use the police aggregate policy-map class configuration command to apply an aggregate policer to multiple classes in the same policy map. A policer defines a maximum permissible rate of transmission, a maximum burst size for transmissions, and an action to take if either maximum is exceeded. Use the no form of this command to remove the specified policer.
police aggregate aggregate-policer-name
no police aggregate aggregate-policer-name
Syntax Description
Defaults
No aggregate policers are defined.
Command Modes
Policy-map class configuration
Command History
Usage Guidelines
The switch supports a maximum of 229 policer instances associated with ports (228 user-configurable policers and 1 policer reserved for internal use). When CPU protection is enabled (the default), you can configure 45 ingress policers per port. If you disable CPU protection by entering the no policer cpu uni all global configuration command and reloading the switch, you can configure up to 64 ingress policers per port (63 policers on every fourth port). For more information, see the policer cpu uni command.
Aggregate policing applies only to input policy maps.
An aggregate policer differs from an individual policer in that it is shared by multiple traffic classes within a policy map. You use an aggregate policer to police traffic streams across multiple classes in a policy map attached to an interface. You cannot use aggregate policing to aggregate traffic streams across multiple interfaces.
Only one policy map can use any specific aggregate policer.
Examples
This example shows how to configure the aggregate policing with default actions and apply it across all classes on the same port:
Switch(config)# policy-map inpolicySwitch(config-pmap)# class in-class1Switch(config-pmap-c)# police aggregate agg_policer1Switch(config-pmap-c)# exitSwitch(config-pmap)# class in-class2Switch(config-pmap-c)# police aggregate agg_policer1Switch(config-pmap-c)# exitSwitch(config-pmap)# class in-class3Switch(config-pmap-c)# police aggregate agg_policer1Switch(config-pmap-c)# exitYou can verify your settings by entering the show aggregate policer privileged EXEC command.
Related Commands
policer cpu uni
Use the policer cpu uni global configuration command to enable or disable CPU protection and to configure the CPU policing threshold for all user network interfaces (UNIs) and enhanced network interfaces (ENIs) on the switch. Use the no form of this command to return to the default rate or to disable CPU protection.
policer cpu uni {all | rate-bps}
no policer cpu uni {all | rate-bps}
Syntax Description
Defaults
CPU protection is enabled. The default policing threshold is 160000 b/s.
Command Modes
Global configuration
Command History
12.2(25)EX
This command was introduced.
12.2(50)SE
The all keyword was added for disabling or enabling CPU protection.
Usage Guidelines
To protect against accidental or intentional CPU overload, the switch automatically provides CPU protection or control-plane security by dropping or rate-limiting a predefined set of Layer 2 control packets and some Layer 3 control packets for UNIs and ENIs. The switch pre-allocates 27 control-plane security policers for CPU protection, numbered 0 to 26. A policer of 26 means a drop policer. A policer value of 0 to 25 means that the port uses a rate-limiting policer for the control protocol.
CPU policers are pre-allocated. You can configure only the rate-limiting threshold by using the policer cpu uni rate-bps command. The configured threshold applies to all control protocols and all UNIs and ENIs.
CPU protection policing uses 19 policers per port, which allows attaching a maximum of 45 ingress policers to a port. If you need more than 45 policers on a port, you can disable CPU protection by entering the no cpu policer uni all global configuration command before you attach a policy map with more than 45 policers. When CPU protection is disabled, you can attach up to 64 ingress policers to a port.
Note
When you disable or enable the CPU protection feature, you must reload the switch by entering the reload privileged EXEC command before the configuration takes effect.
Note
You can enter the show policer cpu uni-eni {drop | rate} privileged EXEC command to see if CPU protection is enabled.
For more information about control-plane security, see the software configuration guide for this release.
Examples
This example shows how to set CPU protection threshold to 10000 b/s and to verify the configuration.
Switch# config tEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# policer cpu uni 10000Switch(config)# endYou can verify your settings by entering the show policer cpu uni-eni rate privileged EXEC command.
This example shows how to disable CPU protection and to reload the switch.
Switch(config)# no policer cpu uni allSwitch(config)# endSwitch# reloadProceed with reload? [confirm]This is an example of the output from the show policer cpu uni-eni rate privileged EXEC command when CPU protection is disabled:
Switch# show policer cpu uni-eni rateCPU Protection feature is not enabledRelated Commands\
policy-map
Use the policy-map global configuration command to create or to modify a policy map that can be attached to multiple physical ports and to enter policy-map configuration mode. Use the no form of this command to delete an existing policy map.
policy-map policy-map-name
no policy-map policy-map-name
Syntax Description
Defaults
No policy maps are defined. By default, packets are sent unmodified.
Command Modes
Global configuration
Command History
Usage Guidelines
The switch supports a maximum of 256 unique policy maps.
Before configuring policies for classes whose match criteria are defined in a class map, use the policy-map command to specify the name of the policy map to be created or modified. Entering the policy-map command also enables the policy-map configuration mode, in which you can configure or modify the class policies for that policy map.
After entering the policy-map command, you enter policy-map configuration mode, and these configuration commands are available:
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Note
Warning: Detaching Policy test1 from Interface GigabitEthernet0/1You can configure class policies in a policy map only if the classes have match criteria defined for them. To configure the match criteria for a class, use the class-map global configuration and match class-map configuration commands. You define packet classification on a physical-port basis.
You can create input policy maps and output policy maps, and you can assign one input policy map and one output policy map to a port. The input policy map acts on incoming traffic on the port; the output policy map acts on outgoing traffic.
You can apply the same policy map to multiple physical ports.
Follow these guidelines when configuring input policy maps:
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Follow these guidelines when configuring output policy maps:
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For more information about policy maps, see the software configuration guide for this release.
Examples
This example shows how to create an input policy map for three classes:
Switch(config)# policy-map input-allSwitch(config-pmap)# class goldSwitch(config-pmap-c)# set dscp af43Switch(config-pmap-c)# exitSwitch(config-pmap)# class silverSwitch(config-pmap-c)# police 50000000Switch(config-pmap-c)# exitSwitch(config-pmap)# class bronzeSwitch(config-pmap-c)# police 20000000Switch(config-pmap-c)# exitThis example shows how to configure an output policy map that provides priority with rate limiting to the gold class and guarantees a minimum remaining bandwidth percent of 20 percent to the silver class and 10 percent to the bronze class:
Switch(config)# policy-map output-2Switch(config-pmap)# class gold-outSwitch(config-pmap-c)# prioritySwitch(config-pmap-c)# police 50000000Switch(config-pmap-c)# exitSwitch(config-pmap)# class silver-outSwitch(config-pmap-c)# bandwidth percent 20Switch(config-pmap-c)# exitSwitch(config-pmap)# class bronze-outSwitch(config-pmap-c)# bandwidth percent 10Switch(config-pmap-c)# exitThis example shows how to delete the policy map output-2:
Switch(config)# no policy-map output-2You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
port-channel load-balance
Use the port-channel load-balance global configuration command to set the load-distribution method among the ports in the EtherChannel. Use the no form of this command to return to the default setting.
port-channel load-balance {dst-ip | dst-mac | src-dst-ip | src-dst-mac | src-ip | src-mac}
no port-channel load-balance
Syntax Description
Defaults
The default is src-mac.
Command Modes
Global configuration
Command History
Usage Guidelines
For information about when to use these forwarding methods, see the "Configuring EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to set the load-distribution method to dst-mac:
Switch(config)# port-channel load-balance dst-macYou can verify your setting by entering the show running-config privileged EXEC command or the show etherchannel load-balance privileged EXEC command.
Related Commands
Accesses or creates the port channel.
Displays EtherChannel information for a channel.
show running-config
Displays the operating configuration. For syntax information, use this link to the Cisco IOS Release 12.2 Command Reference listing page: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/prod_command_reference_list.html
Select the Cisco IOS Commands Master List, Release 12.2 to navigate to the command.
port-type
Use the port-type interface configuration command to change the port type on a Cisco ME switch from its existing port type to a network node interface (NNI), a user network interface (UNI), or an enhanced network interfaces (ENI). Use the no form of this command to return the port to its default setting.
port-type {eni | nni | uni}
no port-type
Syntax Description
Defaults
If no configuration file exists, all the 10/100 ports on the Cisco ME switch are UNIs, and the small form-factor pluggable (SFP) module slots on the Cisco ME switch are NNIs. You must configure a port to be an ENI port.
A port configured as an ENI has the same defaults as a UNI port, but the you can configure control protocols (CDP, STP, LLDP, LACP and PAgP) on ENIs. These protocols are not supported on UNIs.
The default status for a UNI or ENI is administratively down to prevent unauthorized users from gaining access to other ports as you configure the switch. You must use the no shutdown interface configuration command to enable a UNI or ENI before you can configure it.
The default status for an NNI is administratively up to allow a service provider remote access to the switch during initial configuration.
Configuring a port as an ENI does not change the administrative state of the port. If the port state is shutdown before a port-type change, it remains in shutdown state; if the state is no shutdown, it remains in no shutdown state.
Command Modes
Interface configuration
Command History
Usage Guidelines
A port can be reconfigured to another port type. When a port is reconfigured as the other interface type, it inherits all the characteristics of that interface type. By default all ports on the switch are either UNI or NNI. At any time, all ports on the Cisco ME switch are UNIs, NNIs, or ENIs.
Some features are not supported only on all port types. Control protocols (CDP, STP, LLDP, and EtherChannel LACP and PAgP) have different support on each port type:
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For information about specific feature support, see the software configuration guide for this release.When you change a port from one type to another, any features exclusive to a port type are removed from the configuration to prevent conflicting configuration options on a specific interface.
Every port on the switch can be a UNI or ENI, but only four ports can be NNIs at the same time.
Entering the no port-type or default port-type interface configuration command returns the port to the default state: UNI for Fast Ethernet ports and NNI for Gigabit Ethernet ports.
Traffic is not switched between UNIs or ENIs, and all traffic incoming on UNIs or ENIs must exit on NNIs to prevent a user from gaining access to another user's private network. If it is appropriate for two or more UNIs or ENIs to exchange traffic within the switch, you can assign the interface to a community VLAN. A community VLAN can contain a maximum of eight UNIs or ENIs. We do not recommend mixing UNIs and ENIs in the same community VLAN.
For more information about configuring VLANs, see the software configuration guide for this release.
Examples
This example shows how to change a port to an NNI.
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface fastethernet0/1Switch(config-if)# no shutdownSwitch(config-if)# port-type nni5d20h: %SYS-5-CONFIG_I: Configured from console by consoleSwitch(config-if)# endSwitch# copy running-config startup-configThis example shows how to change a port type to an ENI.
Switch# config terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface fastethernet0/1Switch(config-if)# no shutdownSwitch(config-if)# port-type eniSwitch(config-if)# endRelated Commands
no shutdown
Enables an interface.
Displays the statistical information specific to all interfaces or to a specific interface.
Displays the port type of an interface.
priority
Use the priority policy-map class configuration command to configure class-based priority queuing for a class of traffic belonging to an output policy map. The switch supports strict priority queuing or priority used with the police policy-map command. Use the no form of this command to remove a priority specified for a class.
priority
no priority
Note
Syntax Description
This command has no arguments or keywords.
Defaults
No policers are defined.
Command Modes
Policy-map class configuration
Command History
Usage Guidelines
When used by itself (not followed by the police policy-map command), the priority command assigns traffic to a low-latency path and ensures that packets belonging to the class have the lowest possible latency. With strict priority queuing, packets in the priority queue are scheduled and sent until the queue is empty.
Note
You can use priority with the police {rate-bps | cir cir-bps} policy-map command to reduce the bandwidth used by the priority queue. This is the only form of policing that is supported in output policy maps. Using this combination of commands configures a maximum rate on the priority queue and allows you to use the bandwidth and shape average policy-map commands for other classes to allocate traffic rates on other queues.
Note
When you configure priority in an output policy map without the police command, you can only configure the other queues for sharing by using the bandwidth remaining percent policy-map class command. This command does not guarantee the allocated bandwidth, but the rate of distribution.
When you configure priority in an output policy map with the police command, you can configure other queues for sharing by using the bandwidth policy-map class command and for shaping by using the shape average policy-map class command.
You can associate the priority command only with a single unique class for all attached output policies on the switch.
You cannot associate the priority command with the class-default of the output policy map.
You cannot configure priority and any other scheduling action (shape average or bandwidth) in the same class.
The priority command uses a default queue limit for the class. You can change the queue limit by using the queue-limit policy-map class command, overriding the default set by the priority command.
Examples
This example shows how to configure the class out-class1 as a strict priority queue so that all packets in that class are sent before any other class of traffic. Other traffic queues are configured so that out-class-2 gets 50 percent of the remaining bandwidth and out-class3 gets 20 percent of the remaining bandwidth. The class class-default receives the remaining 30 percent with no guarantees.
Switch(config)# policy-map policy1Switch(config-pmap)# class out-class1Switch(config-pmap-c)# prioritySwitch(config-pmap-c)# exitSwitch(config-pmap)# class out-class2Switch(config-pmap-c)# bandwidth remaining percent 50Switch(config-pmap-c)# exitSwitch(config-pmap)# class out-class3Switch(config-pmap-c)# bandwidth remaining percent 20Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet0/1Switch(config-if)# service-policy output policy1Switch(config-if)# exitThis example shows how to use the priority with police commands to configure out-class1 as the priority queue, with traffic going to the queue limited to 20000000 bits per second (bps) so that the priority queue never uses more than that. Traffic above that rate is dropped. The other traffic queues are configured as in the previous example.
Switch(config)# policy-map policy1Switch(config-pmap)# class out-class1Switch(config-pmap-c)# prioritySwitch(config-pmap-c)# police 20000000Switch(config-pmap-c)# exitSwitch(config-pmap)# class out-class2Switch(config-pmap-c)# bandwidth percent 50Switch(config-pmap-c)# exitSwitch(config-pmap)# class out-class3Switch(config-pmap-c)# bandwidth percent 20Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet0/1Switch(config-if)# service-policy output policy1Switch(config-if)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
private-vlan
Use the private-vlan VLAN configuration command to configure private VLANs and to configure the association between private-VLAN primary and secondary VLANs. Use the no form of this command to return the VLAN to normal VLAN configuration.
private-vlan {association [add | remove] secondary-vlan-list | community | isolated | primary}
no private-vlan {association | community | isolated | primary}
Syntax Description
Defaults
The default is to no configured private VLANs.
Command Modes
VLAN configuration
Command History
Usage Guidelines
You must manually configure private VLANs on all switches in the Layer 2 network to merge their Layer 2 databases and to prevent flooding of private-VLAN traffic.
You cannot include VLAN 1 or VLANs 1002 to 1005 in the private-VLAN configuration. Extended VLANs (VLAN IDs 1006 to 4094) can be configured as private VLANs.
You can associate a secondary (isolated or community) VLAN with only one primary VLAN. A primary VLAN can have one isolated VLAN and multiple community VLANs associated with it.
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A community VLAN carries traffic among community ports and from community ports to the promiscuous ports on the corresponding primary VLAN. A community VLAN can include no more than eight user network interfaces (UNIs).
An isolated VLAN is used by isolated ports to communicate with promiscuous ports. It does not carry traffic to other community ports or to isolated ports with the same primary VLAN domain.
A primary VLAN is the VLAN that carries traffic from a gateway to customer end stations on private ports.
The private-vlan commands do not take effect until you exit from VLAN configuration mode.
Do not configure private-VLAN ports as EtherChannels. While a port is part of the private-VLAN configuration, any EtherChannel configuration for it is inactive.
A private VLAN cannot be a Remote Switched Port Analyzer (RSPAN) VLAN.
A private VLAN cannot be a user network interface-enhanced network interface (UNI-ENI) VLAN. If the VLAN is a UNI-ENI isolated VLAN (the default), you can change it to a private VLAN by entering the private-vlan VLAN configuration command. If a VLAN has been configured as a UNI-ENI community VLAN, you must first enter the no uni-vlan VLAN configuration command before configuring it as a private VLAN.
Although a private VLAN contains more than one VLAN, only one STP instance runs for the entire private VLAN. When a secondary VLAN is associated with the primary VLAN, the STP parameters of the primary VLAN are propagated to the secondary VLAN.
See the switchport private-vlan command for information about configuring host ports and promiscuous ports.
Note
Examples
This example shows how to configure VLAN 20 as a primary VLAN, VLAN 501 as an isolated VLAN, VLANs 502 and 503 as community VLANs, and to associate them in a private VLAN. The example assumes that VLANs 502 and 503 were previously configured as UNI-ENI community VLANs.
Switch# configure terminalSwitch(config)# vlan 20Switch(config-vlan)# private-vlan primarySwitch(config-vlan)# exitSwitch(config)# vlan 501Switch(config-vlan)# private-vlan isolatedSwitch(config-vlan)# exitSwitch(config)# vlan 502Switch(config-vlan)# no uni-vlanSwitch(config-vlan)# private-vlan communitySwitch(config-vlan)# exitSwitch(config)# vlan 503Switch(config-vlan)# no uni-vlanSwitch(config-vlan)# private-vlan communitySwitch(config-vlan)# exitSwitch(config)# vlan 20Switch(config-vlan)# private-vlan association 501-503Switch(config-vlan)# endYou can verify your setting by entering the show vlan private-vlan or show interfaces status privileged EXEC command.
Related Commands
show interfaces status
Displays the status of interfaces, including the VLANs to which they belong.
show vlan private-vlan
Displays the private VLANs and VLAN associations configured on the switch.
Configures a private-VLAN port as a host port or promiscuous port.
queue-limit
Use the queue-limit policy-map class configuration command to set the queue maximum threshold for Weighted Tail Drop (WTD) in an output policy map. Use the no form of this command to return to the default.
queue-limit [cos value | dscp value | precedence value | qos-group value] number-of-packets [packets]
no queue-limit [cos value | dscp value | precedence value | qos-group value] number-of-packets [packets]
Syntax Description
Defaults
Default queue limit is 160 (256-byte) packets.
Command Modes
Policy-map class configuration
Command History
12.2(25)EX
This command was introduced.
12.25(SEG)
Support was added to configure the queue-limit in the class-default of an output policy map.
Usage Guidelines
You use the queue-limit policy-map class command to control output traffic. Queue-limit settings are not supported in input policy maps.
Beginning with Cisco IOS Release 12.2(35)SE, the switch supports one output policy map for each interface. However the limit of three unique queue-limit configurations across all output policy maps remains in effect You can use the same queue-limit configuration across multiple policy maps.
Within an output policy map only four queues (classes) are allowed, including the class default. Each queue has three defined thresholds (queue limits). Only three queue-limit configurations are allowed on the switch, but multiple policy maps can share the same queue-limits. For two policy maps to share a queue-limit configuration, all threshold values must be the same for all classes in both policy maps.
If you try to attach an output policy map that contains a fourth queue-limit configuration to an interface, you see an error message and the attachment is not allowed.
The queue-limit command is supported only after you first configure a scheduling action, such as bandwidth, shape-average, or priority, except when you configure queue-limit in the class-default of an output policy map.
You cannot configure more than two unique threshold values for WTD qualifiers (cos, dscp, precedence, or qos-group) in the queue-limit command. However, you can map any number of qualifiers to those thresholds. You can configure a third unique threshold value to set the maximum queue, using the queue-limit command with no qualifiers.
When you use the queue-limit command to configure thresholds within a class map, the WTD thresholds must be less than or equal to the maximum threshold of the queue. This means that the queue size configured without a qualifier must be larger than any of the queue sizes configured with a qualifier.
Examples
This example shows how to configure WTD so that out-class1, out-class2, out-class3, and class-default get a minimum of 40, 20, 10 and 10 percent of the traffic bandwidth respectively. The corresponding queue-sizes are set to 48, 32, 16 and 272 (256-byte) packets:
Switch(config)# policy-map out-policySwitch(config-pmap)# class outclass1Switch(config-pmap-c)# bandwidth percent 40Switch(config-pmap-c)# queue-limit 48Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass2Switch(config-pmap-c)# bandwidth percent 20Switch(config-pmap-c)# queue-limit 32Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass3Switch(config-pmap-c)# bandwidth percent 10Switch(config-pmap-c)# queue-limit 16Switch(config-pmap-c)# exitSwitch(config-pmap)# class class-defaultSwitch(config-pmap-c)# bandwidth percent 10Switch(config-pmap-c)# queue-limit 272Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface gigabitethernet 0/1Switch(config-if)# service-policy output out-policySwitch(config-if)# exitThis example shows how to configure WTD for a Fast Ethernet port where outclass1, outclass2, and outclass3 get a minimum of 50, 20, and 10 percent of the traffic bandwidth. The class-default gets the remaining 20 percent. Each corresponding queue size is set to 64, 32, and 16 (256-byte) packets, respectively. The example also shows how if outclass1 matches to dscp 46, 56, 57, 58, 60, 63, a DSCP value of 46 gets a queue size of 32 (256-byte) packets; DSCP values 56, 57, and 58 get queue sizes of 48 (256-byte) packets; and the remaining DSCP values of 60 and 63 get the default queue size of 64 (256-byte) packets.
Switch(config)# policy-map out-policySwitch(config-pmap)# class outclass1Switch(config-pmap-c)# bandwidth percent 50Switch(config-pmap-c)# queue-limit 64Switch(config-pmap-c)# queue-limit dscp 46 32Switch(config-pmap-c)# queue-limit dscp 56 48Switch(config-pmap-c)# queue-limit dscp 57 48Switch(config-pmap-c)# queue-limit dscp 58 48Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass2Switch(config-pmap-c)# bandwidth percent 20Switch(config-pmap-c)# queue-limit 32Switch(config-pmap-c)# exitSwitch(config-pmap)# class outclass3Switch(config-pmap-c)# bandwidth percent 10Switch(config-pmap-c)# queue-limit 16Switch(config-pmap-c)# exitSwitch(config-pmap)# exitSwitch(config)# interface fastethernet 0/1Switch(config-if)# service-policy output out-policySwitch(config-if)# exitYou can use these same queue-limit values in multiple output policy maps on the switch. However, changing one of the queue-limit values in a class would create a new, unique queue-limit configuration. You can attach only three unique queue-limit configurations in output policy maps to interfaces at any one time. If you try to attach an output policy map with a fourth unique queue-limit configuration, you see this error message:
QoS: Configuration failed. Maximum number of allowable unique queue-limit configurations exceeded.You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
remote-span
Use the remote-span VLAN configuration command to configure a VLAN as a Remote Switched Port Analyzer (RSPAN) VLAN. Use the no form of this command to remove the RSPAN designation from the VLAN.
remote-span
no remote-span
Syntax Description
This command has no arguments or keywords.
Defaults
No RSPAN VLANs are defined.
Command Modes
VLAN configuration (config-VLAN)
Command History
Usage Guidelines
Valid RSPAN VLAN IDs are 2 to 1001 and 1006 to 4094. The RSPAN VLAN cannot be VLAN 1 (the default VLAN) or VLAN IDs 1002 to 1005 (reserved for Token Ring and FDDI VLANs).
Before you configure the RSPAN remote-span command, use the vlan global configuration command to create the VLAN.
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The RSPAN VLAN has these characteristics:
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You must manually also configure both source, destination, and intermediate switches (those in the RSPAN VLAN between the source switch and the destination switch) with the RSPAN VLAN ID.
When an existing VLAN is configured as an RSPAN VLAN, the VLAN is first deleted and then recreated as an RSPAN VLAN. Any access ports become inactive until the RSPAN feature is disabled.
Examples
This example shows how to configure a VLAN as an RSPAN VLAN.
Switch(config)# vlan 901Switch(config-vlan)# remote-spanThis example shows how to remove the RSPAN feature from a VLAN.
Switch(config)# vlan 901Switch(config-vlan)# no remote-spanYou can verify your settings by entering the show vlan remote-span user EXEC command.
Related Commands
renew ip dhcp snooping database
Use the renew ip dhcp snooping database privileged EXEC command to renew the DHCP snooping binding database.
renew ip dhcp snooping database [validation none] [{flash:/filename | ftp://user:password@host/filename | nvram:/filename | rcp://user@host/filename | tftp://host/filename}] [validation none]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If you do not specify a URL, the switch tries to read the file from the configured URL.
Examples
This example shows how to renew the DHCP snooping binding database without checking CRC values:
Switch# renew ip dhcp snooping database validation noneYou can verify settings by entering the show ip dhcp snooping database privileged EXEC command.
Related Commands
Enables DHCP snooping on a VLAN.
Configures the DHCP snooping binding database.
Displays the status of the DHCP snooping database agent.
reserved-only
Use the reserved-only DHCP pool configuration mode command to allocate only reserved addresses in the Dynamic Host Configuration Protocol (DHCP) address pool. Use the no form of the command to return to the default.
reserved-only
no reserved-only
Syntax Description
This command has no arguments or keywords.
Defaults
The default is to not restrict pool addresses
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Entering the reserved-only command restricts assignments from the DHCP pool to preconfigured reservations. Unreserved addresses that are part of the network or on pool ranges are not offered to the client, and other clients are not served by the pool.
By entering this command, users can configure a group of switches with DHCP pools that share a common IP subnet and that ignore requests from clients of other switches.
To access DHCP pool configuration mode, enter the ip dhcp pool name global configuration command.
Examples
This example shows how to configure the DHCP pool to allocate only reserved addresses:
Switch# config tEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# ip dhcp pool test1Switch(dhcp-config)# reserved-onlyYou can verify your settings by entering the show ip dhcp pool privileged EXEC command.
Related Commands
