[c-nsp] BFD CPU hog and traceback on me3600 and isis flapping 15.3(3)S1a

[Vitkovský Adam]

Hello Pete,
I wasn't performing the upgrade and the guy who did is not sure whether it was immediate.
Anyways he eventually noticed that within an hour or so.
Right now it is running smoothly for nearly 23 hours.


adam

From: Pete Lumbis [mailto:alumbis at gmail.com]
Sent: Tuesday, March 18, 2014 12:41 AM
To: Vitkovský Adam
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] BFD CPU hog and traceback on me3600 and isis flapping 15.3(3)S1a

How soon after the upgrade to 15.4.1 did you see the issue again?
What was that time difference compared to when you re-enabled BFD to show TAC and now (assuming it's still stable)?

On Mon, Mar 17, 2014 at 11:36 AM, Vitkovský Adam <adam.vitkovsky at swan.sk<mailto:adam.vitkovsky at swan.sk>> wrote:
Hi folks,

Anyone ran into issues with BFD on me3600 running 15.3(3)S1a or 15.4(1)S1

This particular ring is up for about 3 weeks.
Yesterday on one of the nodes where no customers are connected yet one colleague of mine noticed some BFD process CPU hogs and some tracebacks and ISIS sessions flapping cause of the BFD flaps.
Upgrade to 15.4(1)S1 and reload did not help. What helped was to remove the "isis bfd" from the interface.

Strange enough when I added the "isis bfd" back today so that I can see what's going on and to open up the case with cisco nothing happened.
So this might be some slow buffer overflow.

Has anyone experienced something like this please?


adam


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