2950 sx 1 gigabit port is not giving led

Unanswered Question
Apr 19th, 2009
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Dear


I have 2950 sx 24.It has 2 fiber gigabit port.I saw the laser led coming from the one port but the same other port it is not coming.It's switch related problem.


Please suggest me.

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Giuseppe Larosa Mon, 04/20/2009 - 00:44
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Hello Upendra,

try to do the following:


swap gbics between the one that works and the one that doesn't work.


take note of results


try to swap fibers


take note of results


final note: I would suggest to avoid to open multiple threads for the same issue delete the second one to avoid confusion.


Hope to help

Giuseppe


upendra07 Mon, 04/20/2009 - 00:50
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Dear


Thanks,


I tried but i obeserved one thing


when i see the working port i seen laser coming from the port but when i seen the bad port the laser is not coming from the port.

Giuseppe Larosa Mon, 04/20/2009 - 00:59
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Hello Upendra,

I hope you are not using your eyes to check when the laser is transmitting this is not recommended !


Be also aware that we cannot see near infrared (second window is 1.3 micrometers lamdba and third window is in the range 1.5 micrometers).


Verify the part numbers of the GBIC there is a chance that you have mixed GBICs of different types.


see


http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html


as a reference.


There is also a chance that is not working well.

to check each gbic you can loop the fiber tx to rx.


Hope to help

Giuseppe


upendra07 Mon, 04/20/2009 - 01:14
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Dear


Any physical problem in port or any ios related problem.


There is also dust related problem.

Dust is in the Port

Leo Laohoo Mon, 04/20/2009 - 14:38
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Please try the command "sh post".

upendra07 Tue, 04/21/2009 - 23:11
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thanks


it's showing "Passed"



where we can use the command


Leo Laohoo Wed, 04/22/2009 - 14:39
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Have you tried replacing the fiber cable?

upendra07 Wed, 04/22/2009 - 21:16
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yes,


i think problem in port


can you tell me any command so i can check port status

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