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%ETHCNTR-3-LOOP_BACK_DETECTED:

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

1 REPLY
Hall of Fame Super Silver

Re: %ETHCNTR-3-LOOP_BACK_DETECTED:

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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