2950 - Loopback error

Unanswered Question
Jul 4th, 2007

I get a LOOPBACK error message on my 2950 switch which disables the port. What should I check for ? I have no idea where to start. Whats causing this?

I have this problem too.
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Edison Ortiz Wed, 07/04/2007 - 18:07

Can you please post the exact error and also the output from typing

show interfaces status err-disabled

royalblues Wed, 07/04/2007 - 19:43

There was a bug filed but it was junked, because it is mostly caused by a STP loop or bad cabling. The following bug more details on this

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCea46385

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12220se/3750smg/msg_desc.htm#wp98430

You might also want to consider err-disable recovery. You can enable it using

2950-A#conf t

Enter configuration commands, one per line. End with CNTL/Z.

2950-A(config)#errdisable recovery cause loopback

HTH, rate if it does

Narayan

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