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

Mon Sep 17 10:52:58 EDT 2007

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Rubens Kuhl Jr. wrote:
> 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.)
- -------------------------
we have stp features enabled to hopefully address loops along w/ UDLD
for unidirectional links issues.


regards,
/virendra


> 
> 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:
> 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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