怎样配置和验证CEF

配置CEF

•ip cef (默认已经启用)

•ip route-cache cef (只能在VLAN interface上配置)

验证CEF

•show ip cef fa 0/1 detail (查询fa0/1的FIB表信息)

•show adjacency fa 0/1 detail (查询fa0/1的邻接表信息)

验证CEF命令

Switch#show ip cef [type mod/port | vlan_interface] [detail]

Switch# show ip cef vlan 11 detail
IP CEF with switching (Table Version 11), flags=0x0
10 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 0
13 leaves, 12 nodes, 14248 bytes, 14 inserts, 1 invalidations
0 load sharing elements, 0 bytes, 0 references
universal per-destination load sharing algorithm, id 4B936A24
2(0) CEF resets, 0 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 1s)
0 in-place/0 aborted modifications
refcounts: 1061 leaf, 1052 node

Table epoch: 0 (13 entries at this epoch)

172.16.11.0/24, version 6, epoch 0, attached, connected
0 packets, 0 bytes
via Vlan11, 0 dependencies
valid glean adjacency

验证三层交换命令
Switch#show interface {{type mod/port} | {port-channel number}} | begin L3

Switch#show interface fastethernet 3/3 | begin L3

L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 12 pkt, 778 bytes mcast

L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

4046399 packets input, 349370039 bytes, 0 no buffer

Received 3795255 broadcasts, 2 runts, 0 giants, 0 throttles

.....

Switch#

显示三层硬件交换统计

Switch#show interfaces {{type mod/port} | {port-channel number}} include switched

Switch#show interfaces gigabitethernet 9/5 | include switched

L2 Switched: ucast: 8199 pkt, 1362060 bytes - mcast: 6980 pkt, 371952 bytes

L3 in Switched: ucast: 3045 pkt, 742761 bytes - mcast: 0 pkt, 0 bytes mcast

L3 out Switched: ucast: 2975 pkt, 693411 bytes - mcast: 0 pkt, 0 bytes

验证邻接信息
Switch#show adjacency [{{type mod/port} |

{port-channel number}} | detail | internal | summary]
Switch#show adjacency gigabitethernet 9/5 detail

Protocol Interface Address

IP GigabitEthernet9/5 172.20.53.206(11)

504 packets, 6110 bytes

00605C865B82

000164F83FA50800

ARP 03:49:31

Debugging CEF操作
显示CEF的debug信息
Switch#debug ip cef {drops | access-list | receive | events | prefix-ipc | table}
显示设计IPC的CEF debug信息
Switch#debug ip cef {ipc | interface-ipc}
执行扩展PING
Switch#ping ip


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