3750G-48TS and GLC-LH-SM

Unanswered Question
Aug 20th, 2008

Anyone had any issues with getting a GLC-LH-SM module to work in a 3750G-48TS switch? Any special commands to make it work?

I have a customer who can't see any link lights not see the 2960G switch on the other end with another GLC-LH-SM module. I've tried the "speed nonegotiate" command but no luck.

I have this problem too.
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blue phoenix Tue, 12/09/2014 - 08:21

Hi all,

Client installed a single mode fibre run from Distribution Switch to Access switch. The distance is not even greater than 100 Metres but the client insisted since the fibre is free.

on the Cisco Catalyst 2960X-24TS-L (Access layer not stacked) the switch is identified, but on the Cisco Catalyst 2960X-24TS-L (Distribution switch stacked) the sfp module is "unknown".

Gi1/0/49 access_sw po notconnect 1 auto auto 1000BaseLX SFP

Gi1/0/49 dist_sw po notconnect 1 auto auto unknown

Distribution switch is running 150-2.EX4
Access switch is running 150-2.EX5

I have configured on both sides
speed nonegotiate, above output is showing that the 2 are not even talking to each other since their status is still auto auto...

Any ideas is gladly appreciated!

Kynnzak Wed, 08/20/2008 - 16:15

Nevermind. Shame on me for believing the customer. Turns out the TX and RX strands were reversed on one end. . . . . .


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