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Re: Catalyst/Fiber Backbone Connectivity Problem posted 10/01/2007
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We have replaced the SFPs on both switches about twice so far. The problem
still persists nevertheless.

Frederick had suggested seeing my interface configs. They are as below:

interface GigabitEthernet1/0/26
no switchport
ip address
ip ospf authentication message-digest
ip ospf message-digest-key 3 md5 7 0216054818
storm-control broadcast level 5.00
storm-control multicast level 5.00

interface GigabitEthernet4/1
ip address
ip ospf authentication message-digest
ip ospf message-digest-key 3 md5 7 095C4F1A0A

And thanks Marcus for your suggestion on Cisco-NSP. Would follow up with
that too.



On 10/1/07, Marcus Lasarko <mlasarko@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Greetings Felix,
> As you are powering the SFP on and off this may be a result of
> failing/failed optics.
> Depending on the span distance and type of SFP this could be tricky to
> diagnose.
> Do you have a spare SFP that you can swap out, one-at-a-time?
> I would also recommend bouncing this off the Cisco-NSP list.
> Best,
> ~M
> >>> "Felix Nkansah" <felixnkansah@xxxxxxxxx> 10/1/2007 12:52 PM >>>
> 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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