From: WorkerBee (ciscobee@gmail.com)
Date: Mon Oct 01 2007 - 13:59:08 ART
Probably, a good way to start is to make sure enable udld mode at both ends.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12240se/scg1/swudld.htm
Check the interface for any error counts which is increasing. Like CRC
errors, etc.
Upgrade to latest IOS may help. I seen this issue with GSR routers on
POS interface.
On 10/2/07, Felix Nkansah <felixnkansah@gmail.com> wrote:
> 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, or the interface is
> administratively shut down n un-shut.
>
> 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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