Catalyst 6500 High Switch Proc

Jon Lewis jlewis at
Sat Nov 15 21:57:38 UTC 2008

On Sat, 15 Nov 2008, Philip L. wrote:

> I've run into a bit of a snag and I hope some folks here may be able to 
> enlighten.  From time to time I check the 'sh platform hardware capacity' 
> command on our Catalyst 6509s and have noticed this item:
> CPU Resources
> CPU utilization: Module             5 seconds       1 minute       5 minutes
>                  5  RP               1% /  0%             3%              4%
>                  5  SP              82% / 27%            62%             73%
> This is shown on two 6509 switches that we operate as Core layer devices. 
> This value goes up to 85-90% during periods of peak traffic and I'm concerned 
> that this may be a problem.
> Checking 'sh proc cpu' is usually 10% or less.
> I've gone over this document backwards and forwards and none of the 
> situations outlined seem to apply here:
> One thing to note, is that our main ACL for ingress traffic is applied here 
> due to historical reasons.  It's roughly 5000 single host entries at present. 
> We also use these devices for NDE.

This should probably be on cisco-nsp rather than nanog, but...

5000 lines for ACL?  I don't have any experience with ACLs of that size, 
but it sounds like a possible problem.

If you're doing netflow export and not doing sampled netflow, I'm guessing 
this is where your problem is.  sh mls netflow table-contention detailed
might be able to confirm or rule this out.

  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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