Re: Strange CDP Observation

I came across this a few months ago. The hostnames were the same :)

On Sun, Nov 29, 2009 at 2:13 PM, Felix Nkansah <felixnkansah_at_gmail.com>wrote:

> Hi Dale,
>
> It's a UTP cable connecting the radio IDU to the switch.
>
> Actually, before submiting the question on GS, I suspected a loop and asked
> my colleague engineer to
>
> 1. "show spann blocked-port" on the switch, but no port appeared to be
> blocked in the output
>
> 2. I made him do a physical trace of the complete cable connecting the
> switch to the radio IDU and to the outdoor component. He confirmed there is
> no physical loop in the cable interconnections.
>
> Nonetheless, the general consensus (based on GS responses) so far is that
> it
> is a loop.
>
> I am aware of other P2P radios also connecting the same said switch to
> other
> sites. Beginning tomorrow, I will get involved directly with the
> troubleshooting of the problem and hope to get it fixed in time.
>
> Felix
>
>
>
> On Sun, Nov 29, 2009 at 8:44 PM, Dale Shaw <dale.shaw_at_gmail.com> wrote:
>
> > Hi Felix,
> >
> > On Sun, Nov 29, 2009 at 9:42 AM, Felix Nkansah <felixnkansah_at_gmail.com>
> > wrote:
> > >
> > > 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?
> >
> > Is it an optical port by any chance? I've seen this exact issue
> > previously and it was caused by a reflection in the fibre path.
> >
> > cheers,
> > Dale
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S, SP), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
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