[c-nsp] Troubleshooting High CPU

[David Warner]

Hi - Thanks for the feedback.

Yes - same hardware (3845), sw, config and traffic. Just deployed as active/standby for HSRP. The chief suspect is the port channel between the ESWs but would like to get the info to confirm whether its spanning tree or another culprit. 

Im unable to get any useful info out the box as when it occurs the CPU spikes and hits VTY so unable to get any commands back. Is there anyway to reserve a minimum amount of CPU to VTY so we can at least issue the commands while the problem is occuring? 

Regards, David




________________________________
From: Eninja <eninja at gmail.com>
To: David Warner <davidwarner1975 at yahoo.com.au>
Cc: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>; Eninja <eninja at gmail.com>
Sent: Tuesday, 1 September, 2009 12:11:07 PM
Subject: Re: [c-nsp] Troubleshooting High CPU

What platform is the device? Are the primary and standby devices the same - platform, SW, config, traffic?

During the spike, is the CPU consumed at interrupt or process level?

Grab and send over sh proc cpu, sh align, sh int stat, sh log (if device is too unresponsive during failover, have onsite personnel pull out traffic-laden cables one by one until device is responsive, grab captures before reinserting cable/s).

-Eninja
PS. Disable console logging


On Aug 31, 2009, at 10:46 PM, David Warner <davidwarner1975 at yahoo.com..au> wrote:

> Hi All,
> 
> Just wondering if I can get some advice.. We have two routers in a HSRP active/standby pair. If ones reloads then the CPU on the other hits 100% and crashes. The only way we can recover this is for a field engineer to pull all the Ethernet cables out and then, when system is calm, repatch them. We access the device via VTY so struggling to actually get any commands in to troubleshoot as per the Cisco 'Troubleshooting High CPU Utilization' doc as the CPU spikes .
> 
> Any advice on best way to progress this?
> 
> Regards, David
> 
> 
> 
>     __________________________________________________________________________________



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