[f-nsp] ICX 7750 sfp port acting weird

[Howard, Christopher]

I have an ICX 7750 that has an SFP port acting really strange.  This has been installed for about 9 months now and a couple weeks ago I plugged up a new interface with a 10G LR SFP+.  The new connection ran fine until yesterday.  The link suddenly dropped with the only message in the console stating that the link had dropped.  No errors.

Today I visited the switch and swapped out the SFP+ thinking that could have gone bad even though it was brand new, no change.  I swapped out the fiber jumper, no change.  I did the same on the other end of the link, no change.  After doing all of that, I moved the SFP+ to a different port and it linked right up.  That was interesting so next I logged into the switch just to see what I can figure out.

At first, it showed there was no SFP in the port:

#sh media e 1/1/5
Port    1/1/5: Type  : EMPTY

After some time passed (maybe a couple hours), it started showing this:

#sh media e 1/1/5
Port    1/1/5: Type  : 1GE M-SX(SFP)
    Vendor:   Version:
    Part# :   Serial#:

And then again, after another couple hours, it shows this:

#sh media e 1/1/5
Port    1/1/5: Type  : 10GE LR 10km ((SFP+))
    Vendor: ???????????????? Version: ??
    Part# : ???????????????? Serial#: ???????????????

I did not touch the port or the SFP during the time between the media checks.  Note that it went from empty, to showing a 1G SFP, to showing a 10G LR SFP+.  It’s not reading part numbers or serial numbers or anything.

I’ve tried just reloading the switch from the CLI.  I have not tried a complete power cycle yet.

I wanted to see if anyone had any ideas to try before I go opening up a TAC case.

-Christopher

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