Wassim

Here are a couple of commands for viewing and troubleshooting CEF. Cisco Express Forwarding Commands By default, Cisco Express Forwarding 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. Cisco Express Forwarding is still disabled if we don’t activate it. (config-if)# ip route-cache cef activates Cisco Express Forwarding under the interface # show platform tcam utilization displays TCAM limits and actual utilization # debug ip cef table This command monitors changes on the Cisco Express Forwarding adjacency table. Let’s run the debug command on a multilayer switch: We list ARP entries: If we remove one entry from ARP table with  clear ip arp  {IP address}: We can see that there’s a change in the Cisco Express Forwarding adjacency table. Indeed, there...