Re: Strange CDP Observation

Yes you have a loop somewhere in your L2 network that you need to trace down. I have seen this before and it turned out to be a hub stuck somewhere in the middle of a loop.

Switch1--hub--Switch1
------Original Message------
From: Ernest McCaleb
Sender: nobody_at_groupstudy.com
To: Felix Nkansah
Cc: cisco-nsp_at_puck.nether.net
Cc: CCIE Groupstudy
ReplyTo: Ernest McCaleb
Subject: Re: Strange CDP Observation
Sent: Nov 28, 2009 6:24 PM

There is a loop someplace.

Ernest #21508

On Sat, Nov 28, 2009 at 5:42 PM, Felix Nkansah <felixnkansah_at_gmail.com>wrote:

> Hi Team,
>
> One of my field engineers at a remote site has reported a problem to me,
> one
> which I find rather strange but yet to confirm for myself.
>
> A Catalyst 2960 switch at the remote site is linked to a switch at a
> Central
> site via radio (bridged).
>
> However, besides the fact that connectivity tests between the two sites are
> failing, his observation is that when he issues the "SHOW CDP NEI" command
> on the remote C2960 switch, he sees the switch itself appearing as its
> neighbor rather than the other switch at the central location which is
> typically the output he expected.
>
>
> I have personally never seen a Cisco device showing itself as it's own
> neighbor in a 'show cdp neighbor' output.
>
> What do you know to be the cause of this problem?
>
> Thanks.
>
>
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-- 
Ernest McCaleb
Blogs and organic groups at http://www.ccie.net