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Troubleshooting router/switch performance

– By default, CEF and Fast Switching are enabled.
(config-if)#no ip route-cache
This command disables both Fast Switching and CEF.
(config-if)#ip route-cache
This command enables Fast Switching only. CEF is still disabled if we don’t activate it:

To activate CEF under the interface:
show controllers cpu-interface– see ASICs usage,
– see for each protocol the amount of packets received/dropped/invalid

show controllers utilization
– display bandwidth utilization percentage of each interface of the device

show controllers {int} utilization
– display bandwidth utilization percentage of the mentioned interface

show platform tcam utilization
– display TCAM limits and actual utilization

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