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New Contributor
Posts: 1
Registered: ‎06-24-2014

Problem with RAP3.

Hey.

 

I`ve got a RAP3 that i have connected to a cisco 3560 switch, when i connect it to the switch the port goes into shutdown within a few moments, 

 

In the log on the switch i am getting the following information

 

Feb 12 09:34:10.734 gmt: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on FastEthernet0/11.
Feb 12 09:34:10.734 gmt: %PM-4-ERR_DISABLE: loopback error detected on Fa0/11, putting Fa0/11 in err-disable state
Feb 12 09:34:11.757 gmt: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/11, changed state to down

 

Anyone got any idea what can be wrong here?

MVP
Posts: 1,409
Registered: ‎05-28-2008

Re: Problem with RAP3.

[ Edited ]

Workaround:

Disable keepalives by using the no keepalive interface command. This

will prevent the port from being errdisabled,

---------------------------------------------------------------

try to find your answer here:
https://supportforums.cisco.com/document/20111/error-ethcntr-3-loopbackdetected-catalyst-switch-runs-cisco-iosr-software

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