Strange EIGRP problem

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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Received on Wed Sep 16 2009 - 10:48:20 ART