CEF and Fast Switching

[bkurian]

Why do I need CEF and Fast Switching on a router ?

Does CEF support Policy Based Routing and QoS?

[Richard Burts]

Bijumon

You need CEF and Fast Switching on a router because they improve its performance. Without them the router would forward all packets in process switching mode and performance in process switching mode is much lower than in Fast Switching or CEF modes.

CEF does support Policy Based Routing and QoS.

HTH

Rick

[bkurian]

I know that..My question is What is the reason i need to run both CEF and fast switching on the same router ?

I can see two caches.

show ip cache (fast switching)

sh ip cef (dont remember the exact command