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We are experiencing an issue with a GLC-T SFP in a F2e Line card on a Nexus 7000. No matter what is tried we can it will not go up/up. This connection will go from one Nex7k to another and is intended to be for vPC keep alive. We are running current code 6.2.2a. We also have a Sup2 in the switch. Other SFPs in teh line card work properly.

We have tried - Different ports on the same line card on different port groups - Connecting to other devices such as a laptop - replacing cables - Hard setting speed and duplex - Tested the SFP in other devices. (that came out of a ASR1k) - tested in both switchport and routed modes.

Any ideas out there?

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  • I have had no trouble using GLC-T SFP's in N7K-F248XP-25 or N7K-M148GS-11L linecards. Are your SFPs Cisco branded or 3rd party? If my memory serves me right the instructor at the n7k-course said the nexus is a bit more particular about SPF's. He also said you should use the out of band management for VPC-keep alive. What does your sh int e x/y tranceiver details say?
    – Ryback
    Commented May 20, 2014 at 13:46
  • may be you have faulty cable, glc-t will up only in 1000baseT mode(not 100baseT)
    – pyatka
    Commented May 21, 2014 at 13:07
  • I've had trouble with GLC-T SFP's in certain IOS-XE devices before - realise this is NX-OS - in all cases SFP-GE-T SFP's have worked. It may be worth considering using one instead (they are a bit more expensive). Obvious question is have you raised a TAC case?
    – Andy
    Commented Aug 19, 2015 at 20:12

2 Answers 2

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This was a software issue if I recall correctly

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Set on the Interface speed 1000 We had the issue on Nexus 5600 Switches and that did the trick.

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  • The OP explicitly mentions hard setting different speed and duplex.
    – Teun Vink
    Commented Oct 19, 2017 at 5:24
  • Sorry I don't get you what different speed would you set for a GLC-T. We have it operational on many ports and you don't need to set Duplex.
    – Christoph N
    Commented Oct 22, 2017 at 6:39

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