[c-nsp] Safe to enable CEF on live 3725 production router?

[Mikael Abrahamsson]

On Tue, 1 Aug 2006, Rodney Dunn wrote:

> If it's route cache (fast switching) it's probably pretty unlikely
> turning on CEF will fix it although it should still be done.

Well, actually I'd say the opposite. If you're fast-switching or process 
switching you'll see much more jitter than if you're CEF switching. That's 
my experience from troubleshooting QoS issues. Enabling CEF is the 
preferred way to go if you want proper QoS and predictable behaviour over 
time from the router.

First thing to enable on a cisco router should be CEF (if at all 
possible), and if you have issues with CEF, log a case and get it fixed by 
new code. Running fast-switching or process switching is not the way out, 
it's only a stop-gap meassure until you can get the CEF-problem solved.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se