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New Member

GLC-SX-MM showing not present in 3750x

Hi , I hav e a 3750X Cisco Switch (WS-C3750X-48T-S) It is two Ethernet base SFP installed and working fine at slot 1 & 2,

Now i am trying to install GLC-SX-MM in 3rd and 4th slot, but its not coming up, showing not present, any idea why its happening?

Gi1/1/1                      connected    trunk      a-full a-1000 10/100/1000BaseTX SFP

Gi1/1/2                      connected    trunk      a-full a-1000 10/100/1000BaseTX SFP

Gi1/1/3                      notconnect   1000         auto   auto Not Present

Gi1/1/4                      notconnect   1            auto   auto Not Present

image i am using is

C3750E-UNIVERSALK9-M

any help would be great, thank you

  • LAN Switching and Routing
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Re: GLC-SX-MM showing not present in 3750x

You should be able to mix and match copper and optical SFPs in that module type.

Have you set 'speed nonegotiate' on interface Gi1/1/3? This is necessary for optical SFPs.

6 REPLIES
Hall of Fame Super Silver

Re: GLC-SX-MM showing not present in 3750x

Assuming you have installed either C3KX-NM-1G (Four GbE port network module) or C3KX-NM-10G (Two 10GbE SFP+ ports network module with four physical ports with two SFP+ and two regular SFP ports) you should be able to use those transceivers.

The GLC-SX-MM is explicitly noted as supported on the 3750-X data sheet and is not footnoted to not work in the SFP+ slots.

There aren't any obvious caveats in the Installation Guide.

Do you get any PHY Message log event when inserting the SFP? Is the SFP verified operable in a different switch?

Hope this helps.

New Member

GLC-SX-MM showing not present in 3750x

i dont get any log alert, same module works 3560 switch so SFP is good.

yes i am using  C3KX-NM-1G

i doubt if there is any limitation in ipbase license?

Or any limitation, that i will have to use all 4 ports for GLC-SX-MM or GLCT ? because existing two SFP are Copper base.

Hall of Fame Super Silver

Re: GLC-SX-MM showing not present in 3750x

You should be able to mix and match copper and optical SFPs in that module type.

Have you set 'speed nonegotiate' on interface Gi1/1/3? This is necessary for optical SFPs.

New Member

GLC-SX-MM showing not present in 3750x

You really saved my life , yes i can see the SFP module now , it worked, thank you very much.

Hall of Fame Super Silver

GLC-SX-MM showing not present in 3750x

You're welcome - glad it helped.

The reason I knew to suggest that was from having overlooked the same command myself in the past.

Thanks for the rating.

New Member

GLC-SX-MM showing not present in 3750x

hehe now i can help others in future

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