[c-nsp] 3750 stack with high CPU from IP Input process.

[Ed Butler - RapidSwitch]

I can't be of much help with this, aside from saying we've seen weird CPU
issues on 3750 stacks too.

We isolated one particular problem to the 3750 storm control feature. (When
a storm wasn't occurring.)

Regards,

Ed Butler
RapidSwitch Ltd
DDI: 020 7106 0731

RapidSwitch Ltd, 5th Floor, Sovereign House, 227 Marsh Wall, London, E14 9SD

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-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Johannes Resch
Sent: 27 December 2005 16:48
To: Bill
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 3750 stack with high CPU from IP Input process.

FWIW, I've seen a similar issue on a 3750 stack running 12.2(25)SE (4
stackmembers).
If I remember correctly, the 100% CPU load was all due to interrupt CPU,
however "sh int stat", "sh ip cef switching statistics" and friends
indicated traffic from/to the switch itself was only in the order of ~10pps.

regards,
-jr

On 2005-12-27 14:50, Bill wrote:
>     I ended up rebooting the switch stack last night and guess what? 
> The CPU went back to 5%. I've sent this to Cisco asking them if there 
> is a bug in the IOS.
> 
>       Bill
> 
> 
> ----- Original Message -----
> From: lee.e.rian at census.gov
> To: Bill
> Cc: cisco-nsp at puck.nether.net
> Sent: Sunday, December 25, 2005 2:08 PM
> Subject: Re: [c-nsp] 3750 stack with high CPU from IP Input process.
> 
> 
> The next time it happens, post the results of a "sh proc cpu" & maybe 
> someone can figure out what's causing the cpu busy.  Or at least say 
> it's caused by snmp, spanning tree, or whatever.
> 
> Other good stuff to look at is the results from sh ip traffic
>   need to do it twice - the deltas are what's interesting sh int
>   5 minute in.out rate is interesting, deltas for errors etc. are 
> interesting
> 
> Lee
> 
> 
> "Bill" <admin at vci.net> wrote on 12/25/2005 12:50:18 PM:
> 
> 
>>    Here is the "show proc cpu" The CPU usage is low right now. The 
>>other day something was going on and the CPU went 10 100% for no 
>>reason I could find. I can't find any reason why the CPU would have 
>>gone up when I moved the ethernet cable.
>>
>>      Bill
>>
>>
>>esw-1#show proc cpu
>>CPU utilization for five seconds: 27%/6%; one minute: 27%; five minutes:
> 
> 25%
> 
>> PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
> 
>    <.. snip ..>
> 
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-- 

Johannes Resch

tel: +43 699 / 11 077 818
mail: jr at xor.at

PGP Key ID: AF93FA9B (pgp.mit.edu)

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