4500x VSS Stack SFP's don't link ports

[Jim Matuska]

We have 2 WS-C4500X-32 all SPF+ port switches in a VSS stack.  This stack is running version cat4500e-universalk9.SPA.03.10.01.E.152-6.E1 code with an Enterprise Services license.  

I have been having issues with getting various random ports on both switches in the stack.  I can install an SFP module (doesn't matter whether it is a 1GbitBaseT SFP, 1Gbit LH SMD, 1Gbit MMD module, 10 Gbit LR or even older non DOM enabled SFP modules).  The switch picks up the SFP module just fine, but when I try to link into another switch the port just stays in a down/down state.  

If I switch to another port (using the Same SFP module) it works just fine with the same configuration.  

I am only using genuine Cisco SFP and SFP+ modules.  I first thought it might be some bad ports on one switch in the stack but I recently started seeing the same issue on the other switch too.

The other strange thing is that if I do a show interface transceiver command I can see adequate light levels from the SFP modules but it does not link.  

Has anyone else run into this problem?  

[pieterh]

Hi  fabricejuve,

I suggest you start a new thread instead of adding to an existing thread

[Jim Matuska]

I would agree, open a new thread and you'll get a better response.  I would post your port channel and port configuration (minus sensitive data like IP's, etc.).  That being said, you may want to try upgrading IOS if you are a bit behind on versions, Cisco always seems to be coming out with bug fixes for strange issues. 

[andrii.oliinyk]

i wonder have u managed to find the root cause for your issue?