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Need help for Fiber GLC-LH-SM connection between Cisco 3750

Please help me. I want to connect my two Cisco 3750 switch by gbic GLC-LH-SM.Unfortunately, when i trying to connect,it's not uplink.

More information about two switch below:
Gi1/0/51 notconnect 1 auto auto 1000BaseLX SFP

switch 2 show interface status
Gi2/0/51 notconnect 1 auto auto 1000BaseLX SFP

I have no idea to deal with it,any ideas ?

2 REPLIES

You need to make sure you are

You need to make sure you are using single-mode fiber between your two switches. It should be  yellow, 9 micron.  If you are using single-mode fiber, then make sure the A/B is not switched.

New Member

are the gbics cisco original

are the gbics cisco original ?

if yes then just make sure of the cable which should be Single mode.

if still not working try to reverse the cable connectors on one side as well.

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