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2950 - Loopback error

wazzaclarke
Level 1
Level 1

‎07-04-2007 02:44 PM - edited ‎03-05-2019 05:08 PM

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?

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Edison Ortiz
Hall of Fame
Hall of Fame

‎07-04-2007 06:07 PM

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

show interfaces status err-disabled

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royalblues
Level 10
Level 10
In response to Edison Ortiz

‎07-04-2007 07:43 PM

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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