[c-nsp] Catalyst/Fiber Connectivity Issues

[Childs, Aaron]

I had a similar problem between a 2948-G and a 6506 about two months ago
(CatOS on both devices).  The problem was that the trunk between the two
devices was dropping.  I tested the fiber (tested ok), moved the links
to a different port on both ends, swapped out the GBICS, swapped out the
fiber patch cords, even downgraded the software on the 2948, nothing
solved my problem.  I eventually swapped it out with a spare 2948-G and
the link has been working fine since.

Aaron
-----
Aaron Childs
Assistant Director - Networking
Westfield State College
http://www.wsc.ma.edu/it/

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Felix Nkansah
Sent: Monday, October 01, 2007 1:35 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Catalyst/Fiber Connectivity Issues

Hi,

A client of mine has a fiber backbone between two buildings on their
campus.


The fiber terminates on a Catalyst 6509 (at the data centre) and a
Catalyst
3750 at the other end. Users at the far-end connect to servers located
at
the data center over this fiber.

This connection has been working fine for the past 2 years, until a
recent
problem came up.

For two weeks now, the usual occurrence is for the fiber link to stop
passing traffic while working until the 3750 is rebooted or the fiber
connectors removed from the SFP port and replugged.

Meanwhile, the interface and line protocol remain UP on both switches
during
this abnormal behaviour. There are also no log messages occurring.
Everything look fine on both switches. They just wouldnt pass traffic.
The
problem occurs about twice each day.

It's difficult diagnosing the problem now. I need help pls.

Regards,

Felix
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