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New Member

%ETHCNTR-3-LOOP_BACK_DETECTED

Hi...

I have a problem on catalyst 3550 GBIC LX/LH interface. I get the following message:

"%ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet0/2. The port is forced to linkdown"

And port shuts down. If I bring it up manually, it shuts down after few hours.

Thanks in advance...

mguzina

2 REPLIES
New Member

Re: %ETHCNTR-3-LOOP_BACK_DETECTED

Hi,

On gi0/2 u need to apply the followng commands:

switch(config-if)#no keepalive

on config mode:

switch(config)#errdisbale recovery cause loopback

switch(config)#errdisbale recovery interval 30

The port is going in errdisbale mode due to loopback condidition. disbaling keepalives will not do any harm but will never put the port in loopback.

New Member

Re: %ETHCNTR-3-LOOP_BACK_DETECTED

Unfortunately, there is no loopback option on errdisable recovery cause command. Anyway, if "keepalive not set" does the trick, I will be satsfied. Thanks for advice.

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