Re: Strange EIGRP problem

Chris,

Sometimes the router will display a mismatched K value in debugs even though
that is not the case. It is the "goodbye" message in EIGRP that some routers
will interpret as a mismatched K-value. It is explained in the configuration
guide here (2nd bullet):

http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfeigrp.html#wp1012458

On Wed, Sep 16, 2009 at 8:48 AM, Christopher Copley
<copley.chris_at_gmail.com>wrote:

> Group,
>
> I have been hard at work and I have ran into what is a very strange issue I
> want to share, as I think it might be a good topic for the new trouble
> shooting section. I had an issue where I had a switch and a router
> connecting via eigrp with just a very basic config. The adjacancy kept
> bouncing and I debugged and kept getting a mismatched K value. I did a
> show ip protocols and each neighbor had the default values. I have a
> server
> on my lab so I ran wireshark on it to see what was happening, and each
> neighbor was sending the correct k values. I thought it was a strange
> issue with the EIGRP process, so I deleted the process and recreated on
> both
> the router and the switch. After this did not work, I thought that maybe
> it was some strange layer2 issue. I looked at my L2 data path and saw it
> was going a very strange direction. So I cleaned up the layer2 traffic
> topology to take a more direct path, and it corrected the issue.
>
> Has anyone see the issue of weird stuff like this? That it appear to not
> be
> layer 2 related per error messages and debugs, but that actually end up
> being layer 2 issues?
>
> Chris
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net