%ETHCNTR-3-LOOP_BACK_DETECTED:

Unanswered Question
Feb 23rd, 2009
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Hi,


anyone who has experienced about below logs ?


.Jan 28 14:37:05.208 CCT: %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet

loop-back detected on FastEthernet0/22.

.Jan 28 14:37:05.208 CCT: %PM-4-ERR_DISABLE: loopback error detected on

Fa0/22,putting Fa0/22 in err-disable state

.Jan 28 14:37:06.208 CCT: %LINEPROTO-5-UPDOWN: Line protocol on Interface

FastEthernet0/22, changed state to down

.Jan 28 14:37:07.260 CCT: %LINK-3-UPDOWN: Interface FastEthernet0/22,

changed state to down


thanks.


regards,

jack

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Giuseppe Larosa Tue, 02/24/2009 - 00:41
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Hello Jack,

I've seen the same message on one of our switches some days ago.


I also remember a thread where someone was referring to a bug where a device treats the reception of keepalive messages as a sign of a loop (wrongly)


The reception of its own keepalive messages is a sign of a healthy link.



Hope to help

Giuseppe



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