Fiber optic cable check command

Answered Question
Apr 1st, 2009

I know that "show cable-diag tdr int [slot/port]" command can check 10/100/1000 etherent link. For example WS-X6748-GE-TX... etc.

But I can find any command to check gigabit only ethernet link. for example WS-X6724-SFP

Is there no command to check fiber link??

Thank you

I have this problem too.
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Correct Answer by Leo Laohoo about 7 years 9 months ago

It's got nothing to do with your IOS. The command "show interface transceiver detail" will NOT work on non-DOM (Digital Optical Monitoring) modules, like the SFP. If you have a 10Gb module or the ruggedized SFP, try and this will work.

What are you trying to test on your cable?

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Leo Laohoo Wed, 04/01/2009 - 20:49

What are you trying to test on the fiberoptic?

Have you tried "show interfaces transceiver detail"?

kilsoo.choi Wed, 04/01/2009 - 22:44

I tried "show inter g3/3 tran det".

But the switch display below message.

Router#sh int g3/3 tran det

Diagnostic Monitoring Data is not available.

Could tell me why does switch display that message?

My switch' IOS version is 12.2(18)SFX5.

Correct Answer
Leo Laohoo Wed, 04/01/2009 - 22:48

It's got nothing to do with your IOS. The command "show interface transceiver detail" will NOT work on non-DOM (Digital Optical Monitoring) modules, like the SFP. If you have a 10Gb module or the ruggedized SFP, try and this will work.

What are you trying to test on your cable?

kilsoo.choi Wed, 04/01/2009 - 23:16

Thanks for your answer.

I want to check a optical dBm at running switch. So I want to forecast a possiblity of optical link problem with low dBm.

Is there any way I want?

Thank you

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