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

[Rodney Dunn]

hmm...that's a very low amount % wise so that could be normal
control plane traffic.

I highly doubt turning on CEF will fix it.

You probably need to start getting some traces and narrow
down where the delay/jitter is.

Very very unlikely that it's coming from the router itself if
the packets are interrupt switched.

Rodney

On Tue, Aug 01, 2006 at 02:56:36PM -0500, Nassess, George wrote:
> SO, it looks like I do see some process switched traffic on both LAN and
> WAN interface. I cleared the counters on this guy this AM, would that
> clear these counters as well meaning this data reflects just one day? 
> 
> FastEthernet0/0
>           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
>                Processor      96660    8317066      59287    7907763
>              Route cache   50626091 2240184053   51142148 3914433023
>                    Total   50722751 2248501119   51201435 3922340786
> Interface FastEthernet0/1 is disabled
> 
> ATM1/0
>           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
>                Processor     632812   48364190     652146   47478093
>              Route cache  161523901  157801731  152783919  972528328
>                    Total  162156712  206165921  153436065 1020006421 
> 
> 
> George "Gus" Nasses
> george.nassess at gmacrfc.com
> 
> -----Original Message-----
> From: Rodney Dunn [mailto:rodunn at cisco.com] 
> Sent: Tuesday, August 01, 2006 2:50 PM
> To: Nassess, George
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Safe to enable CEF on live 3725 production router?
> 
> For the most part yes assuming you hit some random bug.
> 
> What does 'sh int stat' say for the interfaces?
> 
> If it's showing process switching that is a problem.
> If it's route cache (fast switching) it's probably pretty unlikely
> turning on CEF will fix it although it should still be done.
> 
> Rodney
> 
> On Tue, Aug 01, 2006 at 02:14:17PM -0500, Nassess, George wrote:
> > Troubleshooting a strange problem, can ping customer's managed router
> > ATM WAN interface, with no loss. When pinging across the router to its
> > ethernet interface, we see occasional packet loss and delay. Not
> enough
> > to affect data, but enough to affect voice quality of H323 trunks that
> > delivers calls to their remote call center. I noticed their 3725 WAN
> > router does not have CEF enabled. We are feeling the pressure, and I
> > wanted to enable CEF as a troubleshooting step, but am not sure of the
> > impact on traffic in a live production router. Is it safe to do this
> > mid-day? 
> >  
> > Gus Nasses
> > george.nassess at gmacrfc.com
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