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Cisco Express Forwarding Commands

Cisco Express Forwarding Commands

This chapter documents commands used to configure Cisco Express Forwarding in Cisco  IOS software. For guidelines on configuring Cisco Express Forwarding, refer to the Cisco IOS Switching Services Configuration Guide.


Note Beginning with Cisco IOS Release 11.3, all commands supported on the Cisco 7500 series routers are also supported on Cisco 7000 series routers.

clear adjacency

To clear the Cisco Express Forwarding (CEF) adjacency table, use the clear adjacency EXEC command.

clear adjacency

Syntax Description

This command has no arguments or keywords.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

When you issue this command, entries in the adjacency table that resides on the route processor are removed and then repopulated. During repopulation, Layer 2 next hop information is reevaluated.

With Distributed CEF (dCEF) mode, the adjacency tables that reside on line cards are always synchronized to the adjacency table that resides on the route processor. Therefore, clearing the adjacency table on the route processor using the clear adjacency command also clears the adjacency tables on the line cards; all changes are propagated to the line cards.

Example

The following example clears the adjacency table:

clear adjacency

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show adjacency

clear cef linecard

To clear Cisco Express Forwarding (CEF) information from line cards, use the clear cef linecard EXEC command.

clear cef linecard [slot-number] [adjacency | interface | prefix]

Syntax Description

slot-number

(Optional) Line card slot number to clear. When you omit this argument, all line card slots are cleared.

adjacency

(Optional) Clears line card adjacency tables and rebuilds adjacency for the specified line card.

interface

(Optional) Clears line card interface information and re-creates the interface information for the specified line card.

prefix

(Optional) Clears line card prefix tables and starts rebuilding the FIB table.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

This command is available only on routers with line cards. This command clears CEF information only on the line cards; CEF information on the route processor is not affected.

Once you clear CEF information from line cards, the corresponding information from the route processor is propagated to the line cards. Inter Process Communication (IPC) ensures that CEF information on the route processor matches the CEF information on the line cards.

Example

The following example clears the CEF information from the line cards:

clear cef linecard

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show cef linecard

clear ip cef prefix-statistics

To clear Cisco Express Forwarding (CEF) counters by resetting the packet and byte count to zero (0), use the clear ip cef prefix-statistics EXEC command.

clear ip cef {network [mask] | *} prefix-statistics

Syntax Description

network

Clears counters for a FIB entry specified by network.

mask

(Optional) Clears counters for a FIB entry specified by network and mask.

*

Clears counters for all FIB entries.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

Example

The following example resets the CEF packet and byte count to zero:

clear ip cef prefix-statistics

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show adjacency
show ip cef

ip cef

To enable Cisco Express Forwarding (CEF) on the route processor card, use the ip cef global configuration command. To disable CEF, use the no form of this command.

ip cef [distributed]
no ip cef [distributed]

Syntax Description

distributed

(Optional) Enables distributed CEF (dCEF) operation. Distributes CEF information to line cards. Line cards perform express forwarding.

Defaults

On this platform... The default is...

Cisco 7000 series equipped with RSP7000

CEF is not enabled.

Cisco 7200 series

CEF is not enabled.

Cisco 7500 series

CEF is enabled.

Cisco 12000 series Gigabit Switch Router

Distributed CEF is enabled.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.1 CC.

This command is not available on the Cisco 12000 series GSR because that router series operates only in distributed CEF mode.

CEF is advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with dynamic, topologically dispersed traffic patterns, such as those associated with Web-based applications and interactive sessions.

Examples

The following example enables standard CEF operation:

ip cef

The following example enables dCEF operation:

ip cef distributed 

Related Commands

You can use the master indexes or search online to find documentation of related commands.

ip route-cache cef

ip cef accounting

To enable network accounting of Cisco Express Forwarding (CEF), use the ip cef accounting global configuration command. To disable network accounting of CEF, use the no form of this command.

ip cef accounting [per-prefix] [non-recursive]
no ip cef accounting [per-prefix] [non-recursive]

Syntax Description

per-prefix

(Optional) Enables the collection of the number of packets and bytes express forwarded to a destination (or prefix).

non-recursive

(Optional) Enables accounting through non-recursive prefixes. For prefixes with directly connected next hops, enables the collection of the number of packets and bytes express forwarded through a prefix.

Default

Accounting is disabled by default.

Command Mode

Global configuration

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

You might want to collect statistics to better understand CEF patterns in your network.

When you enable network accounting for CEF from global configuration mode, accounting information is collected at the route processor when CEF mode is enabled and at the line cards when dCEF mode is enabled.

You can then view the collected accounting information using the show ip cef command.

Example

The following example enables the the collection of CEF accounting information:

ip cef accounting

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show ip cef

ip cef traffic-statistics

To change the time interval that controls when NHRP will set up or tear down an SVC, use the ip  cef traffic-statistics global configuration command. To restore the default values, use the no form of this command.

ip cef traffic-statistics [load-interval seconds] [update-rate seconds]
no ip cef traffic-statistics

Syntax Description

load-interval seconds

(Optional) Length of time (in 30-second increments) during which the average trigger-threshold and teardown-threshold are calculated before an SVC setup or teardown action is taken. (These thresholds are configured in the ip nhrp trigger-svc command.) The load-interval range is 30  seconds to 300 seconds, in 30-second increments. The default value is 30 seconds.

update-rate seconds

(Optional) Frequency that the port adapter sends the accounting statistics to the RP. When using NHRP in distributed CEF switching mode, this value must be set to 5 seconds. The default value is 10  seconds.

Default

load-interval: 30 seconds
update-rate: 10 seconds

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 12.0.

The thresholds in the ip nhrp trigger-svc command must be exceeded during a certain time interval, which is 30 seconds by default. To change that interval, use the load-interval seconds argument of the ip cef traffic-statistics command.

When NHRP is configured on a CEF switching node with a VIP2 adapter, you must make sure the update-rate is set to 5 seconds.

Other features could also use the ip cef traffic-statistics command; this NHRP feature relies on it.

Example

In the following example, the triggering and teardown thresholds are calculated based on an average over 120 seconds:

ip cef traffic-statistics load-interval 120

Related Commands

You can use the master indexes or search online to find documentation of related commands.

ip nhrp trigger-svc

ip load-sharing

To enable load balancing for Cisco Express Forwarding (CEF), use the ip load-sharing interface configuration command. To disable load balancing for CEF, use the no form of this command.

ip load-sharing [per-packet] [per-destination]
no ip cef [per-packet]

Syntax Description

per-packet

(Optional) Enables per-packet load balancing on the interface.

per-destination

(Optional) Enables per-destination load balancing on the interface.

Default

Per-destination load balancing is enabled by default when you enable CEF.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

Per-packet load balancing allows the router to send data packets over successive equal-cost paths without regard to individual destination hosts or user sessions. Path utilization is good, but packets destined for a given destination host might take different paths and might arrive out of order.

Per-destination load balancing allows the router to use multiple, equal-cost paths to achieve load sharing. Packets for a given source-destination host pair are guaranteed to take the same path, even if multiple, equal-cost paths are available. Traffic for different source-destination host pairs tend to take different paths.


Note If you want to enable per-packet load sharing to a particular destination, then all interfaces that can forward traffic to the destination must be enabled for per-packet load sharing.

Examples

The following example enables per-packet load balancing:

interface E0
  ip load-sharing per-packet

The following example enables per-destination load balancing:

interface E0
  ip load-sharing per-destination

Related Commands

You can use the master indexes or search online to find documentation of related commands.

interface
ip cef

ip route-cache cef

To enable Cisco Express Forwarding (CEF) operation on an interface after CEF operation has been disabled, use the ip route-cache cef interface configuration command. To disable CEF operation on an interface, use the no form of this command.

ip route-cache cef
no ip route-cache cef

Syntax Description

This command has no arguments or keywords.

Defaults

When standard CEF or dCEF operation is enabled globally, all interfaces that support CEF are enabled by default.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

Cisco Express Forwarding (CEF) is advanced Layer 3 switching technology for IP. CEF optimizes network performance and scalability for networks with dynamic, topologically dispersed traffic patterns, such as those associated with Web-based applications and interactive type sessions.

Because all interfaces that support CEF or dCEF are enabled by default when you enable standard CEF or dCEF operation globally, you use the no form of the command to turn off CEF operation on a particular interface.

You might want to disable CEF or dCEF on a particular interface because that interface is configured with a feature that CEF or dCEF does not support. For example, policy routing and CEF cannot be used together. You might want one interface to support policy routing while the other interfaces support CEF. In this case, you would turn on CEF globally, but turn off CEF on the interface configured for policy routing, enabling all but one interface to express forward.

When you disable CEF or dCEF, Cisco IOS software switches packets using the next fastest switching path. In the case of dCEF, the next fastest switching path is CEF on the route processor.

If you have disabled CEF or dCEF operation on an interface and want to reenable it, you can do so by using the ip route-cache cef command in interface configuration mode.


Note On the Cisco 12000 series routers, you must not disable dCEF on an interface.

Examples

The following example enables CEF operation on the router (globally), but turns off CEF operation on Ethernet interface 0:

ip cef 
interface e0
  no ip route-cache cef

The following example enables dCEF operation on the router (globally), but turns off CEF operation on Ethernet interface 0:

ip cef distributed 
interface e0
  no ip route-cache cef

The following example reenables dCEF operation on Ethernet interface 0:

ip cef distributed 
interface e0
  ip route-cache cef

Related Commands

You can use the master indexes or search online to find documentation of related commands.

interface
ip cef

show adjacency

To display Cisco Express Forwarding (CEF) adjacency table information, use the show adjacency EXEC command.

show adjacency [detail]

Syntax Description

detail

(Optional) Displays detailed adjacency information, including Layer 2 information.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

This command is available only on routers that have RP cards.

Sample Display

The following is sample output from the show adjacency detail command:

Router# show adjacency detail
Protocol	Interface	Address
IP	Tunnel0	point2point(3)     (incomplete)
		0 packets, 0 bytes
		FIB                00:02:45
IP	Ethernet1/0/0	192.168.177.15(6)
		0 packets, 0 bytes
		0060837BEFA0
Protocol	Interface	Address
		0060836FA7000800
		ARP                03:59:44
		igrp 622      00:04:14
IP	Ethernet0/0	192.168.233.88(5)      
		0 packets, 0 bytes
		0060837BEFA0
		0060836FA7000800
		ARP                03:59:36
IP	FastEthernet2/0/0	172.16.1.106 (11)    (incomplete)
		0 packets, 0 bytes
IP	FastEthernet2/0/0	172.26.1.106 (11)    (incomplete)
		0 packets, 0 bytes

Table 8 describes the fields shown in the output.


Table 8: Show Adjacency Detail Field Descriptions
Field Description

Protocol

The routing protocol configured on the interface.

Interface

The type of interface configured.

Address

The address of the interface.

Routing protocol

The method by which the adjacency was learned.

Adjacent next hop

The MAC address of the adjacent router.

Time stamp

The time left before the adjacency rolls out of the adjacency table. Once it rolls out, a packet must use the same next hop to the destination.

Related Commands

You can use the master indexes or search online to find documentation of related commands.

clear adjacency

show cef

To display which packets the line cards dropped or to display which packets were not express forwarded, use the show cef EXEC command.

show cef [drop | not-cef-switched]

Syntax Description

drop

(Optional) Displays which packets were dropped by each line card.

not-cef-switched

(Optional) Displays which packets were sent to a different switching path.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

This command is available only on routers that have RP cards.

A line card might drop packets due to encapsulation failure, no route information, or no adjacency information.

A packet is sent to a different switching path because Cisco Express Forwarding (CEF) does not support the encapsulation or feature, the packet is destined for the router, or the packet has IP options, such as time stamp and record route. IP options are process switched.

Sample Displays

The following is sample output from the show cef drop command:

Router# show cef drop
CEF Drop Statistics
Slot  Encap_fail  Unresolved Unsupported    No_route      No_adj   ChksumErr
RP             4          89           0           4           0           0
1              0           0           0           0           0           0
2              0           0           5           0           0           5

Table 9 describes the fields shown in the output.


Table 9: Show CEF Drop Field Descriptions
Field Description

Slot

The slot number on which the packets were received.

Encap_fail

Indicates the number of packets dropped after the limit was reached for incomplete packets with no adjacency route.

Unresolved

Indicates the number of packets dropped because the route for the prefix was not resolved.

Unsupported

Indicates the number of packets received for which the adjacency route information was dropped due to unsupported features.

No_route

No route definition is included in the prefix table.

No_adj

The prefix is resolved, but the adjacent route is not indicated.

ChksumErr

Indicates the number of packets received with a checksum error.

The following is sample output from the show cef not-cef-switched command:

Router# show cef not-cef-switched
CEF Packets passed on to next switching layer 
Slot No_adj No_encap Unsuppted Redirect Receive Bad_ttl Options Access RP
0	0	0	0	 91584	0	0	0
1	0	0	0	0	0	0	0	0
2	0	0	0	0	0	0	0	0

Table 10 describes the fields shown in the output.


Table 10: Show CEF Not-CEF-Switched Field Descriptions
Field Meaning

No_adj

Indicates the number of packets sent to the line card to ARP for the adjacent route.

No_encap

Number of encapsulated packets received.

Unsupported Redirect

Number of packets with unsupported features and redirected to another switching layer or location for processing.

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show cef interface
show cef linecard

show cef interface

To display Cisco Express Forwarding (CEF) related interface information, use the show cef interface EXEC command.

show cef interface type number [detail]

Syntax Description

type number

Interface type and number about which to display CEF-related information.

detail

(Optional) Displays detailed CEF information for the specified interface type and number.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

This command is available on routers that have RP cards and line cards.

The detail command displays more CEF-related information for the specified interface.

You can use this command to show the CEF state on an individual interface.

Sample Displays

The following is sample output from the show cef interface detail command for Ethernet interface  0:

Router# show cef interface E0 detail
Ethernet1/0/0 is up (if_number 6)
Internet address is 172.19.177.20/24
ICMP redirects are always sent
Per-packet load balancing is disabled
Inbound access list is 10
Outbound access list is not set
Hardware idb is Ethernet1/0/0
Fast switching type 1, interface type 5
IP Distributed CEF switching enabled
IP Feature CEF switching turbo vector
Fast flags 0x4. ifindex 5(5)
Slot 1 Slot unit 0 VC -1
Hardware transmit queue ptr 0x48001A00 (0x48001A00) >- debugging purposes Transmit limit 
accumulator 0x48001A02 (0x48001A02) IP MTU 1500

Table 11 describes the fields shown in the output.


Table 11: Show CEF Interface Detail Field Descriptions
Field Description

interface type number is {up | down}

Indicates status of the interface.

Internet address

Internet address of the interface

ICMP packets are {always sent | never sent}

Indicates how packet forwarding is configured.

Per-packet load balancing

Status of load balancing in use on the interface (enabled or disabled).

Inbound access list {# | Not set}

Number of access lists defined for the interface.

Outbound access list

Number of access lists defined for the interface.

Hardware idb is type number

Interface type and number configured.

Fast switching type

Used for troubleshooting; indicates switching mode in use.

IP Distributed CEF switching {enabled | disabled}

Indicates the switching path used.

Slot n Slot unit n

The slot number.

Hardware transmit queue

Indicates the number of packets in the transmit queue.

Transmit limit accumulator

Indicates the maximum number of packets allowed in the transmit queue.

IP MTU

The value of the MTU size set on the interface.

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show cef
show cef linecard

show cef linecard

To display Cisco Express Forwarding (CEF) related interface information by line card, use the show cef linecard EXEC command.

show cef linecard [slot-number] [detail]

Syntax Description

slot-number

(Optional) Slot number containing the line card about which to display CEF-related information. When you omit this argument, information about all line cards is displayed.

detail

(Optional) Displays detailed CEF information for the specified line card.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

This command is available only on routers that have RP cards.

When you omit the slot-number argument, information about all line cards is displayed. When you omit the slot-number argument and include the detail keyword, detailed information is displayed for all linecards. When you omit all keywords and arguments, the show cef linecard command displays important information about all line cards in table format.

Sample Displays

The following is sample output from the show cef linecard command. The command displays information for the line cards.

Router# show cef linecard 
CEF table version 115705, 45877 routes
Slot CEF-ver MsgSent XdrSent Seq MaxSeq LowQ HighQ Flags 
1        238     668    9641 616    616    0     0 up, sync
2        238     683   10782 619    629    0     0 up, sync

Table 12 describes the fields shown in the output.


Table 12: Show CEF Linecard Field Descriptions
Field Description

CEF table version

The FIB table version.

XdrSent

IPC information elements (xdrs) packed into IPC messages sent from the RP to the line card.

MsgSent

Number of IPC messages sent.

Seq

Sequence number for the line card.

MaxSeq

Maximum sequence expected by the line card.

LowQ/HighQ

Number of xdr elements in LowQ and HighQ.

Flags

Indicates the status of the line card. Possible states are

  • up Line card is up.

  • sync Line card is in sync with main FIB.

  • repopulate Repopulate FIB on line card.

  • reset Line card FIB is reset.

  • reloading Line card FIB is currently being reloaded.

  • disabled Line card is disabled.

The following is sample output from the show cef linecard detail command for the line card in slot number 2:

Router# show cef linecard 2 detail
CEF line card slot number 2, status up, sync, disabled
line card CEF version number 238
Sequence number 616, Maximum sequence number expected 616 
Send failed 0, Out Of Sequence 0
line card CEF reset 2, reloaded 2
92299/15/91 prefix/adjacency/interface elements queued 
49641 elements packed in 668 messages(1341286 bytes) sent 
0/0 xdr elements in LowQ/HighQ
Input packets 0, bytes 0	<--- line card stats
Output packets 0, bytes 0, drops 0

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show cef
show cef interface

show ip cef

To display entries in the FIB that are unresolved or to display a summary of the FIB, use this form of the show ip cef EXEC command:

show ip cef [unresolved | summary]

To display specific entries in the FIB based on IP address information, use this form of the show  ip  cef EXEC command:

show ip cef [network [mask [longer-prefix]]] [detail]

To display specific entries in the FIB based on interface information, use this form of the show  ip  cef EXEC command:

show ip cef [type number] [detail]

Syntax Description

unresolved

(Optional) Displays unresolved FIB entries.

summary

(Optional) Displays a summary of the FIB.

network

(Optional) Displays the FIB entry for the specified destination network.

mask

(Optional) Displays the FIB entry for the specified destination network and mask.

longer-prefix

(Optional) Displays FIB entries for all more specific destinations.

detail

(Optional) Displays detailed FIB entry information.

type number

(Optional) Interface type and number for which to display FIB entries.

Command Mode

EXEC

Usage Guidelines

This command first appeared to support the Cisco 12012 Gigabit Switch Router in Cisco IOS Release 11.2 GS, and first appeared with multiple platform support in Cisco IOS Release 11.1 CC.

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.

Sample Displays

The following is sample output from the show ip cef unresolved command:

Router# show ip cef unresolved
IP Distributed CEF with switching (Table Version 136632) 
45776 routes, 13 unresolved routes (0 old, 13 new) 
45776 leaves, 2868 nodes, 8441480 bytes, 136632 inserts, 90856 invalidations 
1 load sharing elements, 208 bytes, 1 references 
1 CEF resets, 1 revisions of existing leaves 
refcounts: 527292 leaf, 465617 node
148.214.0.0/16, version 136622
0 packets, 0 bytes
    via 171.69.233.56, 0 dependencies, recursive 
    unresolved
148.215.0.0/16, version 136623
0 packets, 0 bytes
    via 171.69.233.56, 0 dependencies, recursive 
    unresolved
148.218.0.0/16, version 136624
0 packets, 0 bytes

The following is sample output from the show ip cef summary command:

Router# show ip cef summary
IP Distributed CEF with switching (Table Version 135165) 
45788 routes, 0 reresolve, 4 unresolved routes (0 old, 4 new) 
45788 leaves, 2868 nodes, 8442864 bytes, 135165 inserts, 89377 invalidations 
0 load sharing elements, 0 bytes, 0 references 
1 CEF resets, 0 revisions of existing leaves 
refcounts: 527870 leaf, 466167 node

The following is sample output from the show ip cef internal command; it shows load-sharing details for multiple paths to a prefix:

Router# show ip cef 192.168.1.0 internal
192.168.1.0/24, version 135490, per-destination sharing 0 packets, 0 bytes
via 172.19.233.50, 0 dependencies, recursive	<-- possible path 1 info
traffic share 1, current path
next hop 172.19.233.50, Ethernet0/0 via 172.19.233.50/32 valid adjacency
via 172.19.233.49, 0 dependencies, recursive	<-- possible path 2 info
traffic share 1
next hop 172.19.233.49, Ethernet0/0 via 172.19.233.49/32 valid adjacency
0 packets, 0 bytes switched through the prefix Load distribution: 0 1 0 1 0 1 0 1 0 1 0 
1 0 1 0 1 (refcount 1) ^
|.. how the load is distributed among the possible paths 
Hash OK Interface	Address	Packets
1	Y Ethernet0/0	172.19.233.50	0
2	Y Ethernet0/0	172.19.233.49	0
3	Y Ethernet0/0	172.19.233.50	0
4	Y Ethernet0/0	172.19.233.49	0
5	Y Ethernet0/0	172.19.233.50	0
6	Y Ethernet0/0	172.19.233.49	0
7	Y Ethernet0/0	172.19.233.50	0
8	Y Ethernet0/0	172.19.233.49	0
9	Y Ethernet0/0	172.19.233.50	0
10 Y Ethernet0/0	172.19.233.49	0
11 Y Ethernet0/0	172.19.233.50	0
12 Y Ethernet0/0	172.19.233.49	0
13 Y Ethernet0/0	172.19.233.50	0
14 Y Ethernet0/0	172.19.233.49	0
15 Y Ethernet0/0	172.19.233.50	0
16 Y Ethernet0/0	172.19.233.49	0

The following is sample output from the show ip cef detail command 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 172.19.233.33.

Router# show ip cef e0/0 172.19.233.33 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
172.19.233.33/32, version 7417, cached adjacency 172.19.233.33 0 packets, 0 bytes, 
Adjacency-prefix
via 172.19.233.33, Ethernet0/0, 0 dependencies 
next hop 172.19.233.33, Ethernet0/0
valid cached adjacency

Related Commands

You can use the master indexes or search online to find documentation of related commands.

show cef
show cef interface


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