[c-nsp] Catalyst/Fiber Connectivity Issues

[Felix Nkansah]

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