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show cef interface
To display detailed Cisco Express Forwarding information for a specified interface or for all interfaces, use the show cef interfacecommand in user EXEC or privileged EXEC mode.
show cef interface [ type number ] [ statistics | detail | internal | brief | policy-statistics [ input | output ] ]
Syntax Description
type number
(Optional) Interface type and number.
No space is required between the interface type and number.
statistics
(Optional) Displays switching statistics for an interface or interfaces.
detail
(Optional) Displays detailed Cisco Express Forwarding information for the specified interface type and number.
internal
(Optional) Displays internal Cisco Express Forwarding interface status and configuration.
brief
(Optional) Summarizes the Cisco Express Forwarding interface state.
policy-statistics
(Optional) Displays Border Gateway Protocol (BGP) policy statistical information for a specific interface or for all interfaces.
input
(Optional) Displays BGP accounting policy statistics for traffic that is traveling through an input interface.
output
(Optional) Displays BGP accounting policy statistics for traffic that is traveling through an output interface.
Command History
Release
Modification
11.2GS
This command was introduced to support the Cisco 12012 Internet router.
11.1CC
Support for multiple platforms was added.
12.0(14)ST
This command was integrated into Cisco IOS Release 12.0(14)ST, and the statistics keyword was added.
12.2(2)T
This command was integrated into Cisco IOS Release 12.2(2)T, and the detail keyword was added.
12.2(13)T
The policy-statistics keyword was added.
12.0(22)S
The inputand output keywords were added.
The display output was modified to include support for Cisco Express Forwarding for IPv6 and distributed Cisco Express Forwarding interface information. Output fields that support BGP policy accounting were added for the Cisco 7200 series and Cisco 7500 series platforms.
12.3(4)T
The inputand output keywords were added.
The display output was modified to include support for Cisco Express Forwarding for IPv6 and distributed Cisco Express Forwarding interface information. Output fields that support BGP policy accounting were added for the Cisco 7200 series and Cisco 7500 series platforms.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(25)S
The internalkeyword was added.
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.
12.4(20)T
This command was integrated into Cisco IOS Release 12.4(20)T.
Usage Guidelines
You can use this command to display the detailed Cisco Express Forwarding status for all interfaces.
Values entered for the typeand number arguments display Cisco Express Forwarding status information for the specified interface type and number.
The policy-statistics, input, and output keywords are available only on distributed switching platforms.
Examples
The following example shows how to display a summary of Cisco Express Forwarding information for an interface named Ethernet 3/0:
Router# show cef interface ethernet 3/0 brief Interface IP-Address Status Switching Ethernet3/0 10.0.212.6 up CEF Router#The following is sample output from the show cef interfacecommand for Fast Ethernet interface 1/0/0 with BGP policy accounting configured for input traffic:
Router# show cef interface fastethernet 1/0/0 FastEthernet1/0/0 is up (if_number 6) Corresponding hwidb fast_if_number 6 Corresponding hwidb firstsw->if_number 6 Internet address is 10.1.1.1/24 ICMP redirects are always sent Per packet load-sharing is disabled IP unicast RPF check is disabled Inbound access list is not set Outbound access list is not set IP policy routing is disabled BGP based policy accounting on input is enabled BGP based policy accounting on output is disabled Hardware idb is FastEthernet1/0/0 (6) Software idb is FastEthernet1/0/0 (6) Fast switching type 1, interface type 18 IP Distributed CEF switching enabled IP Feature Fast switching turbo vector IP Feature CEF switching turbo vector Input fast flags 0x100, Output fast flags 0x0, Flags 0x0 ifindex 7(7) Slot 1 Slot unit 0 VC -1 Transmit limit accumulator 0xE8001A82 (0xE8001A82) IP MTU 1500The following is sample output from the show cef interface detail command for Ethernet interface 1/0/0:
Router# show cef interface ethernet 1/0/0 detail FastEthernet1/0/0 is up (if_number 6) Corresponding hwidb fast_if_number 6 Corresponding hwidb firstsw->if_number 6 Internet address is 10.1.1.1/24 ICMP redirects are always sent Per packet load-sharing is disabled IP unicast RPF check is disabled Inbound access list is not set Outbound access list is not set IP policy routing is disabled BGP based policy accounting on input is enabled BGP based policy accounting on output is disabled Hardware idb is FastEthernet1/0/0 (6) Software idb is FastEthernet1/0/0 (6) Fast switching type 1, interface type 18 IP Distributed CEF switching enabled IP Feature Fast switching turbo vector IP Feature CEF switching turbo vector Input fast flags 0x100, Output fast flags 0x0, Flags 0x0 ifindex 7(7) Slot 1 Slot unit 0 VC -1 Transmit limit accumulator 0xE8001A82 (0xE8001A82) IP MTU 1500The following is sample output from the show cef interface Null 0 detail command:
Router# show cef interface null 0 detail Null0 is up (if_number 1) Corresponding hwidb fast_if_number 1 Corresponding hwidb firstsw->if_number 1 Internet Protocol processing disabled Interface is marked as nullidb Packets switched to this interface on linecard are dropped to next slow path Hardware idb is Null0 Fast switching type 13, interface type 0 IP CEF switching enabled IP Feature CEF switching turbo vector Input fast flags 0x0, Output fast flags 0x0 ifindex 0(0) Slot -1 Slot unit -1 VC -1 Transmit limit accumulator 0x0 (0x0) IP MTU 1500The following is sample output for internal Cisco Express Forwarding interface status and configuration for the Ethernet 3/1 interface:
Router# show cef interface ethernet 3/1 internal Ethernet3/1 is up (if_number 13) Corresponding hwidb fast_if_number 13 Corresponding hwidb firstsw->if_number 13 Internet address is 10.0.212.6/24 ICMP redirects are always sent Per packet load-sharing is disabled IP unicast RPF check is disabled Inbound access list is not set Outbound access list is not set IP policy routing is disabled BGP based policy accounting on input is disabled BGP based policy accounting on output is disabled Hardware idb is Ethernet3/1 Fast switching type 1, interface type 63 IP CEF switching enabled IP CEF switching turbo vector IP CEF turbo switching turbo vector IP prefix lookup IPv4 mtrie 8-8-8-8 optimized Input fast flags 0x0, Output fast flags 0x0 ifindex 11(11) Slot 3 Slot unit 0 VC -1 Transmit limit accumulator 0x0 (0x0) IP MTU 1500 Subblocks: IPv6: enabled 1 unreachable FALSE redirect TRUE mtu 1500 flags 0x0 link-local address is FE80::20C:CFFF:FEF9:4854 Global unicast address(es): 10:6:6:6:20C:CFFF:FEF9:4854, subnet is 10:6:6:6::/64 [EUI] IPv4: Internet address is 10.0.212.6/24 Broadcast address 255.255.255.255 Per packet load-sharing is disabled IP MTU 1500The table below describes the significant fields shown in the displays.
Table 1 show cef interface Field Descriptions Field
Description
FastEthernet1/0/0 is up
Indicates type, number, and status of the interface.
Internet address is
Internet address of the interface.
ICMP redirects are always sent
Indicates how packet forwarding is configured.
Per packet load-sharing is disabled
Indicates status of load sharing on the interface.
IP unicast RPF check is disabled
Indicates status of IP unicast Reverse Path Forwarding (RPF) check on the interface.
Inbound access list is not set
Indicates the number or name of the inbound access list if one is applied to this interface. Also indicates whether the list is set.
Outbound access list is not set
Indicates the number or name of the outbound access list if one is applied to this interface. Also indicates whether the list is set.
IP policy routing is disabled
Indicates the status of IP policy routing on the interface.
BGP based policy accounting on input is enabled
Indicates the status of BGP policy accounting on the input interface.
BGP based policy accounting on output is disabled
Indicates the status of BGP policy accounting on the output interface.
Hardware idb is Ethernet1/0/0
Interface type and number configured.
Fast switching type
Used for troubleshooting; indicates switching mode in use.
Interface type
Indicates interface type.
IP Distributed CEF switching enabled
Indicates whether distributed Cisco Express Forwarding is enabled on this interface. (Cisco 7500 and 12000 series Internet routers only.)
IP Feature Fast switching turbo vector
Indicates IP fast switching type configured.
IP Feature CEF switching turbo vector
Indicates IP feature Cisco Express Forwarding switching type configured.
Input fast flags
Indicates the input status of various switching features:
- 0x0001 (input Access Control List [ACL] enabled)
- 0x0002 (policy routing enabled)
- 0x0004 (input rate limiting)
- 0x0008 (MAC/Prec accounting)
- 0x0010 (DSCP/PREC/QOS GROUP)
- 0x0020 (input named access lists)
- 0x0040 (NAT enabled on input)
- 0x0080 (crypto map on input)
- 0x0100 (QPPB classification)
- 0x0200 (inspect on input)
- 0x0400 (input classification)
- 0x0800 (1casa input enable)
- 0x1000 (Virtual Private Network [VPN] enabled on a 2swidb)
- 0x2000 (input idle timer enabled)
- 0x4000 (unicast Reverse Path Forwarding [RPF] check)
- 0x8000 (per-address ACL enabled)
- 0x10000 (deaggregating a packet)
- 0x20000 (3GPRS enabled on input)
- 0x40000 (URL RenDezvous)
- 0x80000 (QoS classification)
- 0x100000 (FR switching on interface)
- 0x200000 (4WCCP redirect on input)
- 0x400000 (input classification)
Output fast flags
Indicates the output status of various switching features, as follows:
- 0x0001 (output ACL enabled)
- 0x0002 (IP accounting enabled)
- 0x0004 (WCC redirect enabled interface)
- 0x0008 (rate limiting)
- 0x0010 (MAC/Prec accounting)
- 0x0020 (DSCP/PREC/QOS GROUP)
- 0x0040 (D-QOS classification)
- 0x0080 (output named access lists)
- 0x0100 (NAT enabled on output)
- 0x0200 (TCP intercept enabled)
- 0x0400 (crypto map set on output)
- 0x0800 (output firewall)
- 0x1000 (5RSVP classification)
- 0x2000 (inspect on output)
- 0x4000 (QoS classification)
- 0x8000 (QoS preclassification)
- 0x10000 (output stile)
ifindex 7/(7)
Indicates a Cisco IOS internal index or identifier for this interface.
Slot 1 Slot unit 0 VC -1
The slot number and slot unit.
Transmit limit accumulator
Indicates the maximum number of packets allowed in the transmit queue.
IP MTU
The MTU size set on the interface.
1 Cisco applications and services architecture (CASA)2 Software interface descriptor block (SWIDB)3 General packet radio system (GPRS)4 Web cache communication protocol (WCCP)5 Resource reservation protocol (RSVP)The following is sample output from the show cef interface command using the policy-statisticskeyword:
Router# show cef interface policy-statistics POS7/0 is up (if_number 8) Index Packets Bytes 1 0 0 2 0 0 3 50 5000 4 100 10000 5 100 10000 6 10 1000 7 0 0 8 0 0The following is sample output from the show cef interface command using the policy-statistics keyword. It shows policy statistics for Ethernet interface 1/0.
Router# show cef interface ethernet 1/0 policy-statistics Ethernet1/0 is up (if_number 3) Corresponding hwidb fast_if_number 3 Corresponding hwidb firstsw->if_number 3 Index Packets Bytes 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0The following is sample output from the show cef interface command using the policy-statistics keyword. It shows policy statistics for Fast Ethernet interface 1/0/0 with the policy accounting based on input traffic.
Router# show cef interface fastethernet 1/0/0 policy-statistics input FastEthernet1/0/0 is up (if_number 6) Corresponding hwidb fast_if_number 6 Corresponding hwidb firstsw->if_number 6 BGP based Policy accounting on input is enabled Index Packets Bytes 1 9999 999900 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 10 0 0 11 0 0 12 0 0 13 0 0 14 0 0 15 0 0 16 0 0 17 0 0 18 0 0 19 0 0 20 0 0 21 0 0 22 0 0 23 0 0 24 0 0 25 0 0 26 0 0 27 0 0 28 0 0 29 0 0 30 0 0 31 0 0 32 0 0 33 0 0 34 1234 123400 35 0 0 36 0 0 37 0 0 38 0 0 39 0 0 40 0 0 41 0 0 42 0 0 43 0 0 44 0 0 45 1000 100000 46 0 0 47 0 0 48 0 0 49 0 0 50 0 0 51 0 0 52 0 0 53 0 0 54 5123 1198782The following is sample output from the show cef interface command using the policy-statistics keyword. It shows policy statistics for serial interface 1/1/2 with the policy accounting based on output traffic.
Router# show cef interface serial 1/1/2 policy-statistics output Serial1/1/2 is up (if_number 9) Corresponding hwidb fast_if_number 9 Corresponding hwidb firstsw->if_number 9 BGP based Policy accounting on output is enabled Index Packets Bytes 1 9999 999900 2 0 0 . . . 18 0 0 19 0 0 20 0 0 . . . 34 1234 123400 35 0 0 . . . 44 0 0 45 1000 100000 46 0 0 47 0 0 48 0 0 49 0 0 50 0 0 51 0 0 52 0 0 53 0 0 54 5123 1198782 55 0 0 56 0 0 57 0 0 58 0 0 59 0 0 60 0 0 61 0 0 62 0 0 63 0 0 64 0 0The table below describes the significant fields shown in the display.
Related Commands
Command
Description
clear cef linecard
Clears Cisco Express Forwarding information from line cards.
route-map (IP)
Defines the conditions for redistributing routes from one routing protocol to another, or enables policy routing.
show cef
Displays information about packets forwarded by Cisco Express Forwarding.
show cef drop
Displays which packets the line cards dropped, or displays which packets were not express forwarded.
show cef linecard
Displays Cisco Express Forwarding interface information by line card.
show ip cef
To display entries in the Cisco Express Forwarding Forwarding Information Base (FIB) or to display a summary of the FIB, use the show ip cef command in user EXEC or privileged EXEC mode.
Privileged EXEC Mode
show ip cef [ [ [ network [network-mask] | network/mask ] [longer-prefixes] | interface-type number ] [platform] [ detail | internal [checksum] ] | [ network [network-mask] | network/mask ] [ dependents | same-routing ] | prefix-statistics ]
User EXEC Mode
show ip cef [ [ [ network [network-mask] | network/mask ] [longer-prefixes] | interface-type number ] [platform] [detail] | [ network [network-mask] | network/mask ] [ dependents | same-routing ] | prefix-statistics ]
Syntax Description
network
(Optional) Network number for which to display a FIB entry.
network-mask
(Optional) Network mask to be used with the specified network value.
network / mask
(Optional) The network number assigned to the interface and the length of the prefix.
longer-prefixes
(Optional) Displays FIB entries for more specific destinations.
interface-type
(Optional) Interface type. For more information, use the question mark (?) online help function.
number
(Optional) Interface or subinterface number. For more information about the numbering syntax for your networking device, use the question mark (?) online help function.
platform
(Optional) Displays platform-specific data structure only.
detail
(Optional) Displays detailed FIB entry information.
internal
(Optional) Displays the FIB internal data structure. The internal keyword is available in privileged EXEC mode only.
checksum
(Optional) Displays FIB entry checksum values. The checksum keyword is available in privileged EXEC mode only.
dependents
(Optional) Displays all prefixes recursing through the FIB.
same-routing
(Optional) Displays all prefixes with the same routing.
prefix-statistics
(Optional) Displays nonzero prefix statistics.
Command History
Release
Modification
11.2GS
This command was introduced on the Cisco 12012 Internet router.
11.1CC
This command was modified. Multiple platform support was added.
12.0(5)T
This command was integrated into Cisco IOS Release12.0(5)T.
12.0(17)ST
This command was modified. The display of a message indicating support for Border Gateway Protocol (BGP) policy accounting was added.
12.0(26)S
This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(25)S
This command was modified. The checksum, internal, platform, and prefix-statistics keywords were added. Output was changed to show IPv4 output only.
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.
12.4(24)T
This command was modified. The dependents, longer-prefixes, and same-routing keywords were added.
15.0(1)S
This command was integrated into Cisco IOS Release 15.0(1)S.
Usage Guidelines
Use of the show ip cef command without any keywords or arguments shows a brief display of all FIB entries.
The show ip cef detail command shows detailed FIB entry information for all FIB entries.
Examples
The following is sample output from the show ip cef detailcommand for Ethernet interface 0. It shows all the prefixes resolving through adjacency pointing to next hop Ethernet interface 0/0 and next hop interface IP address 192.0.2.233.
Router# show ip cef Ethernet 0/0 detail IP Distributed CEF with switching (Table Version 136808) 45800 routes, 8 unresolved routes (0 old, 8 new) 45800 leaves, 2868 nodes, 8444360 bytes, 136808 inserts, 91008 invalidations 1 load sharing elements, 208 bytes, 1 references 1 CEF resets, 1 revisions of existing leaves refcounts: 527343 leaf, 465638 node 172.16.0.0/12, version 7417, cached adjacency 192.0.2.230 0 packets, 0 bytes, Adjacency-prefix via 192.0.2.231, Ethernet0/0, 0 dependencies next hop 192.0.2.232, Ethernet0/0 valid cached adjacencyThe table below describes the significant fields shown in the display.
Table 3 show ip cef detail Field Descriptions Field
Description
routes
Total number of entries in the Cisco Express Forwarding table.
unresolved routes
Number of entries in the Cisco Express Forwarding table that do not have resolved recursions categorized by old and new routes.
leaves, nodes, bytes
Number of elements in the Cisco Express Forwarding table and how much memory they use.
inserts
Number of nodes inserted.
invalidations
Number of entries that have been invalidated.
load sharing elements, bytes, references
Information about load sharing elements: how many, number of associated bytes, and number of associated references.
CEF resets
Number of times the Cisco Express Forwarding table has reset.
revisions of existing leaves refcounts
Number of revisions of the existing elements in the Cisco Express Forwarding table.
version
Version of the Cisco Express Forwarding table.
cached adjacency
Type of adjacency to which this Cisco Express Forwarding table entry points.
packets, bytes
Number of packets and bytes switched through the name entry.
dependencies
Number of table entries that point to the named entry.
next hop
Type of adjacency or the next hop toward the destination.
The following is sample output from the show ip cef detailcommand for the prefix 192.0.2.1, showing that the BGP policy accounting bucket number 4 (traffic_index 4) is assigned to this prefix:
Router# show ip cef 192.0.2.1 detail 192.168.5.0/24, version 21, cached adjacency to POS7/2 0 packets, 0 bytes, traffic_index 4 via 192.0.2.233, 0 dependencies, recursive next hop 192.0.2.234, POS7/2 via 172.16.0.0/12 valid cached adjacencyThe table above describes the significant fields shown in the display.
Related Commands
Command
Description
show cef
Displays the packets dropped by the line cards, or displays the packets that were not express forwarded.
show cef interface
Displays Cisco Express Forwarding-related interface information.
show ipv6 cef
Displays entries in the IPv6 FIB.
show ipv6 cef summary
Displays a summary of the entries in the IPv6 FIB.