one of my 3550 catalyst switch Port get always the message "LOOP_BACK_DETECTED: Keepalive packet loop-back d
etected on GigabitEthernet0/11". This Port goes then in the err-disable state. When I take the syntax "no errdisable detect cause loopback" then I get on an another switch the message "LOOP_BA..." too. What can I do?
On Switches there is not much use of keepalives . Keepalives are just used as hellos between the 2 switches.They are not used to check the link reliability or error detection on the link as used in case of routers. You can safely remove the Keepalives from your switch interface and enabled UDLD inturn to check the uni-directional link problem.
UDLD is designed to work specially on GIG interfaces.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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