[c-nsp] High traffic/CPU utilization - 6509

Sun Sep 16 17:05:21 EDT 2007

The error message is about the symptom, not the cause.

There is an unfortunately usual condition with switches and
port-channels: unidirectional links causing layer 2 loops that bypass
spanning-tree controls. The balancing decision of each side may give
one direction a working path, and the other direction a bad path at
some moment (bad cable, bad port etc.)

Putting UDLD (unidirectional link detection) in place can deal with
the issue by shutting down the path, but it won't solve the problem,
just contain it before the network flaps.

Some C6509 modules have also cable diagnostic features,  which may be
useful to find out the problem.

Rubens

On 9/16/07, virendra rode // <virendra.rode at gmail.com> wrote:
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> Hi,
>
> This has happened twice in a row when we configured port-channels on our
> core switches (C6509).
> We saw RP utilization jump to almost 90% and at one point it hit 100%
> causing our network to flap. We are able to calm it down by shutting the
> port-channel but we are still scratching our heads as to what could have
> caused this spike.
>
> We've found this to be spurious and we were unable to track down what
> was spiking the cpu.
>
> The error message decoder off CCO is stating that this message is
> informational and that no action is required <head scratching>?
>
>
> core-1#
>
> Sep 16 00:43: %CONST_DIAG-SP-6-HM_MESSAGE: High traffic/CPU util seen on
> Module 6 [SP=16%,RP=86%,Traffic=0%]
>
> 6    2  Supervisor Engine 720 (Active)         WS-SUP720-BASE
> 6  000d.xxxx.xxxx to 000d.xxxx.xxxx   3.0   7.7(1)       12.2(17a)SX1 Ok
> 6 Policy Feature Card 3       WS-F6K-PFC3A         hw 2.0    Ok
>
>
> core-1#sh ver | incl IOS
> IOS (tm) s72033_rp Software (s72033_rp-PSV-M), Version 12.2(17a)SX1, EARLY
> DEPLOYMENT RELEASE SOFTWARE (fc1)
>
>
>
> Any pointers will be appreciated.
>
>
> regards,
> /virendra
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