(Optional) Provides information about the mobile node’s current location.
prefix
(Optional) IPv6 address prefix of the care-of address or the home address.
home-address
(Optional) IPv6 address assigned to the mobile node within its home subnet prefix on its home link.
interface-typeinterface-number
(Optional) Interface type and number.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(14)T
This command was introduced.
Usage Guidelines
The clearipv6mobilebinding command clears the binding caches for a specified mobile node (if specified) or all mobile nodes (if no arguments or keywords are specified).
The prefix
argument can be a prefix for the care-of address or the home address of a mobile node, so that entire networks can be cleared. Enter /128 to clear an individual mobile node.
Use of this command with the interface-typeandinterface-number arguments clears all bindings on the specified interface.
Examples
In the following example, the binding caches for all mobile nodes are cleared:
Router# clear ipv6 mobile binding
Clear 1 bindings [confirm]
Router# show ipv6 mobile binding
Mobile IPv6 Binding Cache Entries:
Selection matched 0 bindings
Related Commands
Command
Description
binding
Configures binding options for the Mobile IPv6 home agent feature in home agent configuration mode.
ipv6mobilehome-agent(globalconfiguration)
Enters home agent configuration mode.
showipv6mobilebinding
Displays information about the binding cache.
clear ipv6 mobile home-agents
To clear the neighboring home agents list, use the clearipv6mobilehome-agentscommand in privileged EXEC mode.
The clearipv6mobilehome-agents command clears the neighboring home agents list. The list is subsequently reconstructed from received router advertisements.
If you do not enter the optional interfacetype and interface-numberarguments, the home agent lists on all interfaces are cleared.
Examples
In the following example, the neighboring home agent lists are cleared:
Router# clear ipv6 mobile home-agents
Related Commands
Command
Description
binding
Configures binding options for the Mobile IPv6 home agent feature in home agent configuration mode.
ipv6mobilehome-agent(globalconfiguration)
Enters home agent configuration mode.
showipv6mobilehome-agent
Displays neighboring home agents.
clear ipv6 mobile traffic
To clear statistics associated with Mobile IPv6 traffic, use the clearipv6mobiletrafficcommand in privileged EXEC mode.
clearipv6mobiletraffic
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(14)T
This command was introduced.
Usage Guidelines
The clearipv6mobiletraffic command clears the statistics about the received binding updates and transmitted binding acknowledgments on a mobile node.
Examples
In the following example, statistics about binding updates and binding acknowledgments are cleared:
Router# clear ipv6 mobile traffic
Router# show ipv6 mobile traffic
MIPv6 statistics:
Rcvd: 0 total
0 truncated, 0 format errors
0 checksum errors
Binding Updates received:0
0 no HA option, 0 BU's length
0 options' length, 0 invalid CoA
Sent: 0 generated
Binding Acknowledgements sent:0
0 accepted (0 prefix discovery required)
0 reason unspecified, 0 admin prohibited
0 insufficient resources, 0 home reg not supported
0 not home subnet, 0 not home agent for node
0 DAD failed, 0 sequence number
Binding Errors sent:0
0 no binding, 0 unknown MH
Home Agent Traffic:
0 registrations, 0 deregistrations
unknown time since last accepted HA registration
unknown time since last failed HA registration
unknown last failed registration code
Traffic forwarded:
0 tunneled, 0 reversed tunneled
Dynamic Home Agent Address Discovery:
0 requests received, 0 replies sent
Mobile Prefix Discovery:
0 solicitations received, 0 advertisements sent
Related Commands
Command
Description
binding
Configures binding options for the Mobile IPv6 home agent feature in home agent configuration mode.
showipv6mobilehome-agent
Displays neighboring home agents.
clear ipv6 mtu
To clear the maximum transmission unit (MTU) cache of messages, use the clearipv6mtucommand in privileged EXEC mode.
clearipv6mtu
Syntax Description
This command has no arguments or keywords.
Command Default
Messages are not cleared from the MTU cache.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
Cisco IOS XE Release 2.6
This command was introduced.
Cisco IOS XE Release 3.2SE
This command was integrated into Cisco IOS XE Release 3.2SE.
Usage Guidelines
If a router is flooded with ICMPv6 toobig messages, the router is forced to create an unlimited number of entries in the MTU cache until all available memory is consumed. Use the clearipv6mtu command to clear messages from the MTU cache.
Examples
The following example clears the MTU cache of messages:
Router# clear ipv6 mtu
Related Commands
Command
Description
ipv6flowset
Configures flow-label marking in 1280-byte or larger packets sent by the router.
clear ipv6 multicast aaa authorization
To clear authorization parameters that restrict user access to an IPv6 multicast network, use the clearipv6multicastaaaauthorizationcommand in privileged EXEC mode.
Interface type and number. For more information, use the question mark (?) online help function.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.4(4)T
This command was introduced.
Usage Guidelines
Using the clearipv6multicastaaaauthorizationcommand without the optional interface-type
and interface-number
arguments will clear all authorization parameters on a network.
Examples
The following example clears all configured authorization parameters on an IPv6 network:
Sets parameters that restrict user access to an IPv6 multicast network.
clear ipv6 nat translation
To clear dynamic Network Address Translation--Protocol Translation (NAT-PT) translations from the dynamic state table, use the clearipv6nattranslationcommand in privileged EXEC mode.
clearipv6nattranslation*
Syntax Description
*
Clears all dynamic NAT-PT translations.
Command Default
Entries are deleted from the dynamic translation state table when they time out.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(13)T
This command was introduced.
Usage Guidelines
Use this command to clear entries from the dynamic translation state table before they time out. Static translation configuration is not affected by this command.
Examples
The following example shows the NAT-PT entries before and after the dynamic translation state table is cleared. Note that all the dynamic NAT-PT mappings are cleared, but the static NAT-PT configurations remain.
Designates that traffic originating from or destined for the interface is subject to NAT-PT.
showipv6nattranslations
Displays active NAT-PT translations.
clear ipv6 nd destination
To clear IPv6 host-mode destination cache entries, use the
clear ipv6 nd destination command in privileged EXEC mode.
clear
ipv6nddestination [
vrfvrf-name]
Syntax Description
vrf
vrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.0(2)SE
This command was introduced.
Usage Guidelines
The
clear ipv6 nd destination command clears IPv6 host-mode destination cache entries. If the
vrfvrf-name keyword and argument pair is used, then only information about the specified VRF is cleared.
Examples
The following example shows how to clear IPv6 host-mode destination cache entries:
Device# clear ipv6 nd destination
Related Commands
Command
Description
ipv6 nd host mode strict
Enables the conformant, or strict, IPv6 host mode.
clear ipv6 nd on-link prefix
To clear on-link prefixes learned through router advertisements (RAs), use the
clear ipv6 nd on-link prefix command in privileged EXEC mode.
clearipv6ndon-linkprefix [
vrfvrf-name]
Syntax Description
vrf
vrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.0(2)SE
This command was introduced.
Usage Guidelines
Use the
clear ipv6 nd on-link prefix command to clear locally reachable IPv6 addresses (e.g., on-link prefixes) learned through RAs. If the
vrfvrf-name keyword and argument pair is used, then only information about the specified VRF is cleared.
Examples
The following examples shows how to clear on-link prefixes learned through RAs:
Device# clear ipv6 nd on-link prefix
Related Commands
Command
Description
ipv6 nd host mode strict
Enables the conformant, or strict, IPv6 host mode.
clear ipv6 nd router
To clear neighbor discovery (ND) device entries learned through router advertisements (RAs), use the
clear ipv6 nd router command in privileged EXEC mode.
clearipv6ndrouter [
vrfvrf-name]
Syntax Description
vrf
vrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.0(2)SE
This command was introduced.
Usage Guidelines
Use the
clear ipv6 nd router command to clear ND device entries learned through RAs. If the
vrfvrf-name keyword and argument pair is used, then only information about the specified VRF is cleared.
Examples
The following example shows how to clear neighbor discovery ND device entries learned through RAs:
Device# clear ipv6 nd router
Related Commands
Command
Description
ipv6 nd host mode strict
Enables the conformant, or strict, IPv6 host mode.
clear ipv6 neighbors
To delete all entries in the IPv6 neighbor discovery cache, except static entries and ND cache entries on non-virtual routing and forwarding (VRF) interfaces, use the
clearipv6neighbors command in privileged EXEC mode.
Syntax for Releases 15.0(1)M, 12.2(33)SXH, and 12.2(33)SRC, and Later Releases
Syntax for Release Cisco IOS XE Release 2.1 and Later Releases
clearipv6neighbors
Syntax Description
interfacetypenumber
(Optional) Clears the IPv6 neighbor discovery cache in the specified interface.
ipv6ipv6-address
(Optional) Clears the IPv6 neighbor discovery cache that matches the specified IPv6 address on the specified interface.
statistics
(Optional) Clears the IPv6 neighbor discovery entry cache.
vrf
(Optional) Clears entries for a virtual private network (VPN) routing or forwarding instance.
table-name
(Optional) Table name or identifier. The value range is from 0x0 to 0xFFFFFFFF (0 to 65535 in decimal).
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
12.2(2)T
This command was introduced.
12.0(21)ST
This command was integrated into Cisco IOS Release 12.0(21)ST.
12.0(22)S
This command was integrated into Cisco IOS Release 12.0(22)S.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
15.0(1)M
This command was modified in a release earlier than Cisco IOS Release 15.0(1)M. The
vrf keyword and
table-name argument were added.
12.2(33)SRC
This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SRC.
Cisco IOS XE Release 2.1
This command was implemented on the Cisco ASR 1000 Series Aggregation Services Routers.
Usage Guidelines
The
clear ipv6 neighbor command clears ND cache entries. If the command is issued without the
vrf keyword, then the command clears ND cache entries on interfaces associated with the default routing table (e.g., those interfaces that do not have a
vrf forwarding statement). If the command is issued with the
vrf keyword, then it clears ND cache entries on interfaces associated with the specified VRF.
Examples
The following example deletes all entries, except static entries and ND cache entries on non-VRF interfaces, in the neighbor discovery cache:
Device# clear ipv6 neighbors
The following example clears all IPv6 neighbor discovery cache entries, except static entries and ND cache entries on non-VRF interfaces, on Ethernet interface 0/0:
In the following example, interface Ethernet 0/0 is associated with the VRF named red. Interfaces Ethernet 1/0 and Ethernet 2/0 are associated with the default routing table (because they are not associated with a VRF). Therefore, the clear ipv6 neighbor command will clear ND cache entries on interfaces Ethernet 1/0 and Ethernet 2/0 only. In order to clear ND cache entries on interface Ethernet 0/0, the user must issue the
clear ipv6 neighbor vrf red command.
To
clear all dynamic entries from the Next Hop Resolution Protocol (NHRP) cache, use the clearipv6nhrpcommand in privileged EXEC mode.
clearipv6nhrp
[ ipv6-address | counters ]
Syntax Description
ipv6-address
(Optional) The IPv6 network to delete.
counters
(Optional) Specifies NHRP counters to delete.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.4(20)T
This command was introduced.
Usage Guidelines
This command does not clear any static (configured) IPv6-to-nonbroadcast multiaccess (NBMA) address mappings from the NHRP cache.
Examples
The following example shows how to clear all dynamic entries from the NHRP cache for the interface:
Router# clear ipv6 nhrp
Related Commands
Command
Description
showipv6nhrp
Displays the NHRP cache.
clear ipv6 ospf
To clear the Open Shortest Path First (OSPF) state based on the OSPF routing process ID, use the clearipv6ospf command in privileged EXEC mode.
clearipv6ospf [process-id]
{ process | force-spf | redistribution }
Syntax Description
process-id
(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when enabling the OSPF routing process.
process
Restarts the OSPF process.
force-spf
Starts the shortest path first (SPF) algorithm without first clearing the OSPF database.
redistribution
Clears OSPF route redistribution.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.0(24)S
This command was introduced.
12.2(15)T
This command was integrated into Cisco IOS Release 12.2(15)T.
12.2(18)S
This command was integrated into Cisco IOS Release 12.2(18)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
15.0(1)M
This command was integrated into Cisco IOS Release 12.5(1)M.
Usage Guidelines
When the process keyword is used with the clearipv6ospfcommand, the OSPF database is cleared and repopulated, and then the shortest path first (SPF) algorithm is performed. When the force-spfkeyword is used with the clearipv6ospfcommand, the OSPF database is not cleared before the SPF algorithm is performed.
Use the process-idoption to clear only one OSPFprocess. If the process-idoptionis not specified,all OSPF processesare cleared.
Examples
The following example starts the SPF algorithm without clearing the OSPF database:
Router# clear ipv6 ospf force-spf
clear ipv6 ospf counters
To clear the Open Shortest Path First (OSPF) state based on the OSPF routing process ID, use the clearipv6ospf command in privileged EXEC mode.
(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when enabling the OSPF routing process.
neighbor
(Optional) Neighbor statistics per interface or neighbor ID.
neighbor-interface
(Optional) Neighbor interface.
neighbor-id
(Optional) IPv6 or IP address of the neighbor.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.0(24)S
This command was introduced.
12.2(15)T
This command was integrated into Cisco IOS Release 12.2(15)T.
12.2(18)S
This command was integrated into Cisco IOS Release 12.2(18)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Usage Guidelines
Use the neighborneighbor-interface
option to clear counters for all neighbors on a specified interface. If the neighborneighbor-interface
option is not used, all OSPF counters are cleared.
Use the neighborneighbor-idoption to clear counters at a specified neighbor. If the neighborneighbor-idoptionis not used,all OSPF counters are cleared.
Examples
The following example provides detailed information on a neighbor router:
Router# show ipv6 ospf neighbor detail
Neighbor 10.0.0.1
In the area 1 via interface Serial19/0
Neighbor:interface-id 21, link-local address FE80::A8BB:CCFF:FE00:6F00
Neighbor priority is 1, State is FULL, 6 state changes
Options is 0x194AE05
Dead timer due in 00:00:37
Neighbor is up for 00:00:15
Index 1/1/1, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
The following example clears all neighbors on the specified interface:
Router# clear ipv6 ospf counters neighbor s19/0
The following example now shows that there have been 0 state changes since the clearipv6ospfcountersneighbors19/0 command was used:
Router# show ipv6 ospf neighbor detail
Neighbor 10.0.0.1
In the area 1 via interface Serial19/0
Neighbor:interface-id 21, link-local address FE80::A8BB:CCFF:FE00:6F00
Neighbor priority is 1, State is FULL, 0 state changes
Options is 0x194AE05
Dead timer due in 00:00:39
Neighbor is up for 00:00:43
Index 1/1/1, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
Related Commands
Command
Description
showipv6ospfneighbor
Displays OSPF neighbor information on a per-interface basis.
clear ipv6 ospf events
To clear the Open Shortest Path First (OSPF) for IPv6 event log content based on the OSPF routing process ID, use the clearipv6ospfeventscommand in privileged EXEC mode.
clearipv6ospf [process-id] events
Syntax Description
process-id
(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when enabling the OSPF routing process.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(33)SRC
This command was introduced.
12.2(33)SB
This command was integrated into Cisco IOS Release 12.2(33)SB.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 series routers.
12.2(33)XNE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)XNE.
Usage Guidelines
Use the optional process-id argument to clear the IPv6 event log content of a specified OSPF routing process. If the process-id argument is not used, all event log content is cleared.
Examples
The following example enables the clearing of OSPF for IPv6 event log content for routing process 1:
Router# clear ipv6 ospf 1 events
clear ipv6 pim counters
To reset the Protocol Independent Multicast (PIM) traffic counters, use the clearipv6pimcounters command in privileged EXEC mode.
clearipv6pimcounters
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.0(26)S
This command was introduced.
12.2(18)S
This command was integrated into Cisco IOS Release 12.2(18)S.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 Series Routers.
Usage Guidelines
Using the clearipv6pimcounterscommand will reset all PIM traffic counters.
Examples
The following example resets the PIM traffic counters:
Router# clear ipv6 pim counters
Related Commands
Command
Description
showipv6pimtraffic
Displays the PIM traffic counters.
clear ipv6 pim limit
To clear Protocol Independent Multicast (PIM) statistics, use the clearipv6pimlimit command in privileged EXEC mode.
clearipv6pim
[ vrfvrf-name ]
limit [interface]
Syntax Description
vrfvrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
interface
(Optional) Specific interface for which statistics will be cleared.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
12.2(33)SRE
This command was introduced.
15.1(4)M
The vrfvrf-name keyword and argument were added.
Usage Guidelines
The clearipv6pimlimit command clears IPv6 PIM interface statistics. If the optional interface argument is enabled, only statistics for the specified interface are cleared.
Examples
The following example clears PIM interface limit statistics:
Router# clear ipv6 pim limit
Related Commands
Command
Description
ipv6multicastlimit
Configures per-interface mroute state limiters in IPv6.
ipv6multicastlimitcost
Applies a cost to mroutes that match per interface mroute state limiters in IPv6.
clear ipv6 pim reset
To delete all entries from the topology table and reset the Multicast Routing Information Base (MRIB) connection, use the clearipv6pimresetcommand inprivilegedEXEC mode.
clearipv6pim
[ vrfvrf-name ]
reset
Syntax Description
vrfvrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(2)T
This command was introduced.
12.2(18)S
This command was integrated into Cisco IOS Release 12.2(18)S.
12.0(26)S
This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
15.1(4)M
The vrfvrf-name keyword and argument were added.
Usage Guidelines
Using the clearipv6pimreset command breaks the PIM-MRIB connection, clears the topology table, and then reestablishes the PIM-MRIB connection. This procedure forces MRIB resynchronization.
Caution
Use the clearipv6pimreset command with caution, as it clears all PIM protocol information from the PIM topology table. Use of the clearipv6pimreset command should be reserved for situations where PIM and MRIB communication are malfunctioning.
Examples
The following example deletes all entries from the topology table and resets the MRIB connection:
Router# clear ipv6 pim reset
clear ipv6 pim topology
To clear the Protocol Independent Multicast (PIM) topology table, use the
clearipv6pimtopology command inprivilegedEXEC mode.
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
group-name |
group-address
(Optional) IPv6 address or name of the multicast group.
Command Default
When the command is used with no arguments, all group entries located in the PIM topology table are cleared of PIM protocol information.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(2)T
This command was introduced.
12.2(18)S
This command was integrated into Cisco IOS Release 12.2(18)S.
12.0(26)S
This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 Series Routers.
15.1(4)M
The
vrfvrf-name keyword and argument were added.
15.0(2)SE
This command was integrated into Cisco IOS Release 15.0(2)SE.
Usage Guidelines
This command clears PIM protocol informationfrom all group entries located in the PIM topology table. Information obtained from the MRIB table is retained. If a multicast group is specified, only those group entries are cleared.
Examples
The following example clears all group entries located in the PIM topology table:
Router# clear ipv6 pim topology
clear ipv6 pim traffic
To clear the Protocol Independent Multicast (PIM) traffic counters, use the clearipv6pimtrafficcommand inprivilegedEXEC mode.
clearipv6pim
[ vrfvrf-name ]
traffic
Syntax Description
vrfvrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Default
When the command is used with no arguments, all traffic counters are cleared.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(4)M
This command was introduced.
Usage Guidelines
This command clears PIM traffic counters. If the vrfvrf-name keyword and argument are used, only those counters are cleared.
Examples
The following example clears all PIM traffic counter:
Router# clear ipv6 pim traffic
clear ipv6 prefix-list
To reset the hit count of the IPv6 prefix list entries, use the
clearipv6prefix-listcommand in privileged EXEC mode.
(Optional) The name of the prefix list from which the hit count is to be cleared.
ipv6-prefix
(Optional) The IPv6 network from which the hit count is to be cleared.
This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
/prefix-length
(Optional) The length of the IPv6 prefix. A decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value.
Command Default
The hit count is automatically cleared for all IPv6 prefix lists.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(2)T
This command was introduced.
12.0(21)ST
This command was integrated into Cisco IOS Release 12.0(21)ST.
12.0(22)S
This command was integrated into Cisco IOS Release 12.0(22)S.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 Series Routers.
Usage Guidelines
The
clearipv6prefix-listcommand is similar to the
clearipprefix-listcommand, except that it is IPv6-specific.
The hit count is a value indicating the number of matches to a specific prefix list entry.
Examples
The following example clears the hit count from the prefix list entries for the prefix list named first_list that match the network mask 2001:0DB8::/35.
Enables the generation of sequence numbers for entries in an IPv6 prefix list.
showipv6prefix-list
Displays information about an IPv6 prefix list or prefix list entries.
clear ipv6 rip
To delete routes from the IPv6 Routing Information Protocol (RIP) routing table, use the clearipv6rip command in privileged EXEC mode.
Cisco IOS Release XE 3.9S, Cisco IOS Release 15.3(2)S, and Later Releases
clearipv6rip
[
name]
[
vrfvrf-name]
Releases Prior to Cisco IOS XE Release 3.9S and Cisco IOS Release 15.3(2)S
clearipv6rip
[
name]
Syntax Description
name
(Optional)
Name of an IPv6 RIP process.
vrfvrf-name
(Optional) Clears information about the specified Virtual Routing and Forwarding (VRF) instance.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.0(22)S
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 3.9S
This command was integrated into Cisco IOS XE Release 3.9S. The vrf vrf-name keyword/argument pair was added.
15.3(3)M
This command was integrated into Cisco IOS Release 15.3(3)M.
Usage Guidelines
When the name
argument is specified, only routes for the specified IPv6 RIP process are deleted from the IPv6 RIP routing table. If no name
argument is specified, all IPv6 RIP routes are deleted.
Use the showipv6rip command to display IPv6 RIP routes.
Use the clearipv6ripnamevrfvrf-name command to delete the specified VRF instances for the specified IPv6 RIP process.
Examples
The following example deletes all the IPv6 routes for the RIP process called one:
Device# clear ipv6 rip one
The following example deletes the IPv6 VRF instance, called vrf1 for the RIP process, called one:
Device# clear ipv6 rip one vrf vrf1
*Mar 15 12:36:17.022: RIPng: Deleting 2001:DB8::/32
*Mar 15 12:36:17.022: [Exec]IPv6RT[vrf1]: rip <name>, Delete all next-hops for 2001:DB8::1
*Mar 15 12:36:17.022: [Exec]IPv6RT[vrf1]: rip <name>, Delete 2001:DB8::1 from table
*Mar 15 12:36:17.022: [IPv6 RIB Event Handler]IPv6RT[<red>]: Event: 2001:DB8::1, Del, owner rip, previous None
Related Commands
Command
Description
debugipv6rip
Displays the current contents of the IPv6 RIP routing table.
ipv6ripvrf-modeenable
Enables VRF-aware support for IPv6 RIP.
showipv6rip
Displays the current content of the IPv6 RIP routing table.
clear ipv6 route
To delete routes from the IPv6 routing table, use the
clearipv6routecommand in privileged EXEC mode.
The address of the IPv6 network to delete from the table.
This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
ipv6-prefix
The IPv6 network number to delete from the table.
This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
/prefix-length
The length of the IPv6 prefix. A decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value.
*
Clears all IPv6 routes.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(2)T
This command was introduced.
12.0(21)ST
This command was integrated into Cisco IOS Release 12.0(21)ST.
12.0(22)S
This command was integrated into Cisco IOS Release 12.0(22)S.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Usage Guidelines
The
clearipv6routecommand is similar to the
cleariproutecommand, except that it is IPv6-specific.
When the
ipv6-address or
ipv6-prefix/prefix-length argument is specified, only that route is deleted from the IPv6 routing table. When the
* keyword is specified, all routes are deleted from the routing table (the per-destination maximum transmission unit [MTU] cache is also cleared).
Examples
The following example deletes the IPv6 network 2001:0DB8::/35:
Router# clear ipv6 route 2001:0DB8::/35
Related Commands
Command
Description
ipv6route
Establishes static IPv6 routes.
showipv6route
Displays the current contents of the IPv6 routing table.
clear ipv6 snooping counters
To remove counter entries, use the clearipv6snoopingcounterscommand in privileged EXEC mode.
clearipv6snoopingcounters
[ interfacetypenumber ]
Syntax Description
interfacetypenumber
(Optional) Clears the counter of entries that match the specified interface type and number.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
12.2(50)SY
This command was introduced.
Usage Guidelines
The clearipv6snoopingcounterscommand removes counters from all the configured interfaces. You can use the optional interfacetypenumber keyword and argument to remove counters from the specified interface.
Examples
The following example shows how to remove entries from the counter:
Router# clearipv6 snooping counters
clear ipv6 spd
To clear the most recent Selective Packet Discard (SPD) state transition, use the clearipv6spdcommand in privileged EXEC mode.
clearipv6spd
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.1(3)T
This command was introduced.
Usage Guidelines
The clearipv6spd command removes the most recent SPD state transition and any trend historical data.
Examples
The following example shows how to clear the most recent SPD state transition:
Router# clear ipv6 spd
clear ipv6 traffic
To reset IPv6 traffic counters, use the clearipv6trafficcommand in privileged EXEC mode.
Interface type and number. For more information, use the question mark (?) online help function.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(2)T
This command was introduced.
12.0(21)ST
This command was integrated into Cisco IOS Release 12.0(21)ST.
12.0(22)S
This command was integrated into Cisco IOS Release 12.0(22)S and output fields were added.
12.2(13)T
The modification to add output fields was integrated into this release.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.2(33)XN
The optional interface-type
and interface-number
arguments were added.
Usage Guidelines
Using this command resets the counters in the output from the showipv6traffic command.
Examples
The following example resets the IPv6 traffic counters. The output from theshowipv6traffic command shows that the counters are reset:
Router# clear ipv6 traffic
Router# show ipv6 traffic
IPv6 statistics:
Rcvd: 1 total, 1 local destination
0 source-routed, 0 truncated
0 format errors, 0 hop count exceeded
0 bad header, 0 unknown option, 0 bad source
0 unknown protocol, 0 not a router
0 fragments, 0 total reassembled
0 reassembly timeouts, 0 reassembly failures
Sent: 1 generated, 0 forwarded
0 fragmented into 0 fragments, 0 failed
0 encapsulation failed, 0 no route, 0 too big
Mcast: 0 received, 0 sent
ICMP statistics:
Rcvd: 1 input, 0 checksum errors, 0 too short
0 unknown info type, 0 unknown error type
unreach: 0 routing, 0 admin, 0 neighbor, 0 address, 0 port
parameter: 0 error, 0 header, 0 option
0 hopcount expired, 0 reassembly timeout,0 too big
0 echo request, 0 echo reply
0 group query, 0 group report, 0 group reduce
0 router solicit, 0 router advert, 0 redirects
0 neighbor solicit, 1 neighbor advert
Sent: 1 output
unreach: 0 routing, 0 admin, 0 neighbor, 0 address, 0 port
parameter: 0 error, 0 header, 0 option
0 hopcount expired, 0 reassembly timeout,0 too big
0 echo request, 0 echo reply
0 group query, 0 group report, 0 group reduce
0 router solicit, 0 router advert, 0 redirects
0 neighbor solicit, 1 neighbor advert
UDP statistics:
Rcvd: 0 input, 0 checksum errors, 0 length errors
0 no port, 0 dropped
Sent: 0 output
TCP statistics:
Rcvd: 0 input, 0 checksum errors
Sent: 0 output, 0 retransmitted
Related Commands
Command
Description
showipv6traffic
Displays IPv6 traffic statistics.
clear ipv6 wccp
To remove IPv6 Web Cache Communication Protocol (WCCP) statistics (counts) maintained on the router for a particular service, use the
clearipv6wccp command in privileged EXEC mode.
(Optional) Directs the router to remove statistics for a specific virtual routing and forwarding (VRF) instance.
service-number
(Optional) Number of the cache service to be removed. The number can be from 0 to 254.
web-cache
(Optional) Directs the router to remove statistics for the web cache service.
default
(Optional) Directs the router to remove statistics for the default routing table.
Command Default
WCCP statistics are not removed.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.2(3)T
This command was introduced.
15.1(1)SY1
This command was integrated into Cisco IOS Release 15.1(1)SY1.
Usage Guidelines
Use the
showipv6wccp and
showipv6wccpdetail commands to display WCCP statistics. If Cisco Cache Engines are used in your service group, the reverse proxy service is indicated by a value of 99.
Use the
clearipv6wccp command to clear the WCCP counters for all WCCP services in all VRFs.
Examples
The following example shows how to clear all statistics associated with the web cache service:
Router# clear ipv6 wccp web-cache
Related Commands
Command
Description
ipv6wccp
Enables support of the specified WCCP service for participation in a service group.
showipv6wccp
Displays global statistics related to the WCCP.
clear mls cef ipv6 accounting per-prefix
To clear information about the IPv6 per-prefix accounting statistics, use the
clearmlscefipv6accountingper-prefixcommand in privileged EXEC mode.
clearmlscefipv6accountingper-prefix
{ all | ipv6-address/mask [instance] }
Syntax Description
all
Clears all per-prefix accounting statistics information.
ipv6-address/mask
Entry IPv6 address and mask. The format used is X:X:X:X::X/mask,where the valid values for
mask are from 0 to 128.
instance
(Optional) VPN routing and forwarding instance name.
Command Default
This command has no default settings.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.2(17a)SX
This command was introduced on the Supervisor Engine 720.
12.2(17d)SXB
Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
Usage Guidelines
When entering the
ipv6-address/mask arguments, use this format, X:X:X:X::X/mask,where the valid values for
mask are from 0 to 128.
Examples
This example shows how to clear all information about the per-prefix accounting statistics:
Router#
clear mls cef ipv6 accounting per-prefix all
clear ospfv3 counters
To clear Open Shortest Path First version 3 (OSPFv3) counters, use the
clearospfv3counters command in privileged EXEC mode.
(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
address-family
(Optional) Enter
ipv6 for the IPv6 address family or
ipv4 for the IPv4 address family.
vrf
(Optional) VPN Routing/Forwarding instance.
{vrf-name |
*}
The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.
neighbor
(Optional) Neighbor statistics per interface or neighbor ID.
neighbor-interface
(Optional) Specified neighbor interface.
neighbor-id
(Optional) IPv6 or IPv4 address of the neighbor.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(3)S
This command was introduced.
Cisco IOS XE Release 3.4S
This command was integrated into Cisco IOS XE Release 3.4S.
15.2(1)T
This command was integrated into Cisco IOS Release 15.2(1)T.
15.2(2)S
This command was integrated into Cisco IOS Release 15.2(2)S.
15.2(4)M
This command was integrated into Cisco IOS Release 15.2(4)M.
Usage Guidelines
Use the
neighborneighbor-interface option to clear counters for all neighbors on a specified interface. If the
neighborneighbor-interface option is not used, all OSPFv3 counters are cleared.
Examples
The following example clears all neighbors on the serial 19/0 interface:
Router# clear ospfv3 counters neighbor s19/0
clear ospfv3 force-spf
To run shortest path first (SPF) calculations for an Open Shortest Path First version 3 (OSPFv3) process, use the
clearospfv3force-spf command in privileged EXEC mode.
(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
address-family
(Optional) Enter
ipv6 for the IPv6 address family or
ipv4 for the IPv4 address family.
vrf
(Optional) VPN Routing/Forwarding instance.
{vrf-name |
*}
The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(3)S
This command was introduced.
Cisco IOS XE Release 3.4S
This command was integrated into Cisco IOS XE Release 3.4S.
15.2(1)T
This command was integrated into Cisco IOS Release 15.2(1)T.
15.2(2)S
This command was integrated into Cisco IOS Release 15.2(2)S.
15.2(4)M
This command was integrated into Cisco IOS Release 15.2(4)M.
15.1(1)SY
This command was integrated into Cisco IOS Release 15.1(1)SY.
Usage Guidelines
Use the
clearospv3force-spfcommand to run SPF calculations for either an IPv6 or an IPv4 OSPFv3 instance. If the optional
process-ID argument is not used, SPF runs on all instances on the interface. <<OK?>>
Examples
The following example enables SPF calculations for process 1:
Router# clear ospfv3 1 force-spf
clear ospfv3 process
To reset an Open Shortest Path First version 3 (OSPFv3) process, use the
clearospfv3processcommand in privileged EXEC mode.
(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
address family
(Optional) Enter
ipv6 for the IPv6 address family or
ipv4 for the IPv4 address family.
vrf
(Optional) VPN Routing/Forwarding instance.
{vrf-name |
*}
The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.
synchronization
(Optional) Causes OSPFv3 on the standby Route Processor (RP) to reset and resynchronize with the active RP.
statistics
(Optional) Resets statistical counters maintained for NSR.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(3)S
This command was introduced.
Cisco IOS XE Release 3.4S
This command was integrated into Cisco IOS XE Release 3.4S.
15.2(1)T
This command was integrated into Cisco IOS Release 15.2(1)T.
15.2(2)S
This command was integrated into Cisco IOS Release 15.2(2)S.
15.2(4)M
This command was integrated into Cisco IOS Release 15.2(4)M.
15.1(1)SY
This command was integrated into Cisco IOS Release 15.1(1)SY.
Usage Guidelines
Use the
clearospv3processcommand to reset either an IPv6 or IPv4 OSPFv3 process. If the optional
process-ID argument is not used, all OSPFv3 processes are reset.
Examples
The following example resets the OSPFv3 process 2:
Router# clear ospfv3 2 process
clear ospfv3 redistribution
To clear Open Shortest Path First version 3 (OSPFv3) route redistribution, use the
clearospfv3redistributioncommand in privileged EXEC mode.
(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
address-family
(Optional) Enter
ipv6 for the IPv6 address family or
ipv4 for the IPv4 address family.
vrf
(Optional) VPN Routing/Forwarding instance.
{vrf-name |
*}
The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(3)S
This command was introduced.
Cisco IOS XE Release 3.4S
This command was integrated into Cisco IOS XE Release 3.4S.
15.2(1)T
This command was integrated into Cisco IOS Release 15.2(1)T.
15.2(2)S
This command was integrated into Cisco IOS Release 15.2(2)S.
15.2(4)M
This command was integrated into Cisco IOS Release 15.2(4)M.
15.1(1)SY
This command was integrated into Cisco IOS Release 15.1(1)SY.
Usage Guidelines
Use the
clearospv3processcommand to clear either IPv6 or IPv4 OSPFv3 redistribution. If the optional
process-ID argument is not used, all processes on the interface are cleared. <<OK?>>
Examples
The following example clears OSPFv3 redistribution on all OSPFv3 processes:
Router# clear ospfv3 redistribution
clear ospfv3 traffic
To reset counters and clear Open Shortest Path First version 3 (OSPFv3) traffic statistics, use the
clearospfv3traffic command privileged EXEC mode.
(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
address-family
(Optional) Enter
ipv6 for the IPv6 address family or
ipv4 for the IPv4 address family.
vrf
(Optional) VPN Routing/Forwarding instance.
{vrf-name |
*}
The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.
interface
(Optional) Specified interface from which to clear traffic statistics.
Command Modes
Privileged EXEC
Command History
Release
Modification
15.1(3)S
This command was introduced.
Cisco IOS XE Release 3.4S
This command was integrated into Cisco IOS XE Release 3.4S.
15.2(1)T
This command was integrated into Cisco IOS Release 15.2(1)T.
15.2(2)S
This command was integrated into Cisco IOS Release 15.2(2)S.
15.2(4)M
This command was integrated into Cisco IOS Release 15.2(4)M.
15.1(1)SY
This command was integrated into Cisco IOS Release 15.1(1)SY.
Usage Guidelines
Use the
clearospv3trafficcommand to reset traffic statistics for an IPv6 or IPv4 OSPFv3 process. If the optional
process-ID argument is not used, all traffic statistics are cleared. <<OK?>>
Examples
The following example resets the counters and clears the OSPFv3 traffics statistics:
Router# clear ospfv3 traffic
compatible rfc1583
To restore the method used to calculate summary route costs per RFC 1583, use the
compatiblerfc1583command in router configuration mode. To disable RFC 1583 compatibility, use the
no form of this command.
compatiblerfc1583
nocompatiblerfc1583
Syntax Description
This command has no arguments or keywords.
Command Default
Compatible with RFC 1583.
Command Modes
Router configuration
Command History
Release
Modification
12.1(2)T
This command was introduced.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX
This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
Usage Guidelines
This command is backward compatible with Cisco IOS Release 12.0.
To minimize the chance of routing loops, all Open Shortest Path First (OSPF) routers in an OSPF routing domain should have RFC compatibility set identically.
Because of the introduction of RFC 2328, OSPF Version 2, the method used to calculate summary route costs has changed. Use the no compatible rfc1583 command to enable the calculation method used per RFC 2328.
Examples
The following example specifies that the router process is compatible with RFC 1583:
router ospf 1
compatible rfc1583
!
ctunnel mode
To transport IPv4 and IPv6 packets over Connectionless Network Service (CLNS) tunnel (CTunnel), use the ctunnelmode command in interface configuration mode. To return the ctunnel to the default cisco mode, use the no form of this command.
ctunnelmode
[ gre | cisco ]
noctunnelmode
Syntax Description
gre
(Optional) Sets the ctunnel mode to Generic Routing Encapsulation (GRE) for transporting IPv6 packets over the CLNS network.
cisco
(Optional) Returns the ctunnel mode to the default cisco.
Command Default
Cisco encapsulation tunnel mode is the default.
Command Modes
Interface configuration
Command History
Release
Modification
12.3(7)T
This command was introduced.
12.2(25)S
This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Usage Guidelines
GRE tunneling of IPv4 and IPv6 packets through CLNS-only networks enables Cisco ctunnels to interoperate with networking equipment from other vendors. This feature provides compliance with RFC 3147, Generic Routing Encapsulation over CLNS Networks, which should allow interoperation between Cisco equipment and that of other vendors. in which the same standard is implemented.
RFC 3147 specifies the use of GRE when tunneling packets. The implementation of this feature does not include support for GRE header fields such as those used to specify checksums, keys, or sequencing. Any packets received which specify the use of these features will be dropped.
The default ctunnel mode continues to use the standard Cisco encapsulation. Both ends of the tunnel must be configured with the same mode for it to work. If you want to tunnel ipv6 packets you must use the new gre mode.
Examples
The following example configures a CTunnel from one router to another and shows the CTunnel destination set to 49.0001.1111.1111.1111.00. The ctunnel mode is set to gre to transport IPv6 packets.