C3750 SFP failure after reload

[gatrell]

I have a cable from an SFP module in a WS-C3750-48P with 12.2(55)SE1 running to a Gigabit port on a Cisco WLC. After the switch recovers from a power failure, the gigabit autonegotiation fails. The cure is a long drive to unplug and reseat the SFP. Note this happens at too many similar sites for this to be a loose connection. Interface shutdown then 'no shutdown' is not sufficient. The state is 'line protocol is down (not connected)'.

Interface is configured for switchport mode trunk (auto speed, auto duplex). Command 'switchport nonegotiate' makes no difference. Any ideas? Is there a more powerful command than 'shutdown' which might toggle the interface signals? Is there some way of resetting the SFP?

sh int gi 1/0/1 displays 'media type is 10/100/1000BaseTX SFP' and zero packets received.

[Alexander Maroukian]

Hello John,

Which is the model of the SFP?

Best regards,

Alex

[gatrell]

SFP assembly part number : 73-7757-03

SFP Mpdule revision number : A0

[Alexander Maroukian]

Hello John,

Please check if the SFP is one of these models:

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#wp150398

If you hardcode the speed of the interface does the SFP work properly?

http://www.cisco.com/en/US/products/hw/modules/ps4999/products_tech_note09186a00807a30d6.shtml#trouble3

Best regards,

Alex

[gatrell]

Firmware version 12.2(55)SE1 seems valid for a WS-C3750-48P with GLC-T and min release 12.2(53)SE.

Fixing speed I have tried and makes no difference. While I can encourage others to check their own ios versions, I shall have to live with occasionally reseating the SFP modules.