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

[Church, Chuck]

The percentage of packets being fast switched looks pretty good.  Like
Rodney said, enabling CEF probably won't help much.  Do you have many
interface drops or errors?  If the CPU looks pretty good, enabling CEF
and adding QoS for the VoIP would probably take care of it.  Of course,
make sure the version running on it doesn't have any known Qos or CEF
bugs. 

Chuck 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nassess, George
Sent: Tuesday, August 01, 2006 3:57 PM
To: Rodney Dunn
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Safe to enable CEF on live 3725 production router?

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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