%ETHCNTR-3-LOOP_BACK_DETECTED:

[sadcock123]

Hello,

We recieved this message today which shut down some of up link ports from my 3750 to Cisco 2900. I cannot find an answer and cannot see any issue that could of triggered this. Please can somebody shed some light on this?

Cheers

Steven

[Giuseppe Larosa]

Hello Steven,

post the IOS version you use you may have hit a bug

Other threads reported this kind of event

Hope to help

Giuseppe

[sadcock123]

Thank you for the reply, please see one of the 2900 IOS versions below:-

C2960 Software (C2960-LANBASE-M), Version 12.2(25)SEE3

Cheers

Steven

[Giuseppe Larosa]

Hello Steven,

in this thread

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=LAN%2C%20Switching%20and%20Routing&topicID=.ee71a04&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40^1%40%40.2cc1ebcc/1#selected_message

bug id CSCea46385

I don't see 2960 but 2970 is listed

workaround:

disable keepalive on gbic port

Hope to help

Giuseppe