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Cisco Catalyst Gigabit Fiber Port Not Working

Hello - we have installed a new Cisco Catalyst 3750 V2 switch in our warehouse, and need to connect it via fiber to another switch. We have a GLC-SX SFP MMF module installed in port 1, and a Duplex Multimode fiber patch cable connecting into that module. The switch was processed through express mode, sertting the correct IP configuration for the network, and reinitialized the switch. We also confirmed that the port 1 was not shutdown, with a NO SHUT command. It shows the port as down, but not off. We get no activity light on the port, however. The switch and port on the other side of the connection are active. Not sure what the problem could be.

Thanks for any help

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Craig Beck

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gbotts

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Damian Gardner

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Turned out the new switch was accidentally on the wrong VLAN. put it on the matching VLAN and it works now. thanks guys

gbotts

Glad to hear it's good to go!! Thanks for the update!!

You may want to do the following as well:
<----This would be more secure, but more work as far as adding vlans to your network. As you will have to add to both switches---

vtp mode transparent
vtp domain (add a domain of your choosing - make sure it's the same on both switches)

<------- If you want less security but less work on configuring vlans. This would allow you to create the vlan on the one switch and have it propagate to the other. -----------------

Sw1# vtp mode server
Sw1# vtp domain (add a domain of your choosing)

Sw2# vtp mode client
Sw2# vtp domain (add the same domain as you did above)

<------- If you want less security but max ease on configuring vlans. This would allow you to create the vlan on the either switch and have it propagate to the other. -----------------

Sw1# vtp mode server
Sw1# vtp domain (add a domain of your choosing)

Sw2# vtp mode server
Sw2# vtp domain (add the same domain as you did above)

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Also, look into changing the native vlan....

Hope this helps,