Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

[Cat6K Sup Diagnostics] - GBIC Intergrity "Unknown"?

- Catalyst 6500 with Native IOS 12.1(13)E

Anybody out there who knows the reason why?

There's actually no problem with the GBIC ports but I'd like to know if this kind of status is normal or not. I also have the same results with 16-port GBIC modules but all of them seems to work properly.

Thanks for any answer.

Cisco Employee

Re: [Cat6K Sup Diagnostics] - GBIC Intergrity "Unknown"?

GbicIntegrity diags test is only applicable to the new security enabled GBICs(1000Base-T gbics and CWDM types). It does NOT apply to legacy GBICs.

That's the reason a 'U' is displayed for legacy GBICs.

New Member

Re: [Cat6K Sup Diagnostics] - GBIC Intergrity "Unknown"?

Hi and thanks for your quick reply. Do you know any CCO document (URL) that I can read to understand this better? I mean I'd like to know (or learn) how this works or simply why this does not apply to legacy GBICs, even if it requires me to go back to the basics of GBICs, fiber, copper, etc.

Thanks again.

New Member

Re: [Cat6K Sup Diagnostics] - GBIC Intergrity "Unknown"?

One place where I've found it documented is:

"WDM, copper, and SFP GBIC's all include a GBIC EEPROM "code" that certifies the GBIC as coming from Cisco. New versions of IOS/CatOS check this code to verify the GBIC - if the code is not found, or is not valid, the software will disable the port in software and will not allow traffic to pass. Older GBIC's (5484/5486/5487) were manufactured before this feature was introduced, and do not contain this feature. Regardless, TAC will not troubleshoot a GBIC that was not purchased from Cisco, the same policy as Flash/DRAM memory."


CreatePlease login to create content