Re: Strange CDP Observation

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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Received on Sun Nov 29 2009 - 21:13:38 ART