Simon wrote:
I'll do a more in depth explanation tomorrow. Essentially, this started happening, on every interswitch trunk on most switches on the network:
Oct 6 14:09:07: %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/24. Oct 6 14:09:07: %PM-4-ERR_DISABLE: loopback error detected on Fa0/24, putting Fa0/24 in err-disable state Oct 6 14:09:08: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down Oct 6 14:09:09: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to down Oct 6 14:09:50: %PM-4-ERR_RECOVER: Attempting to recover from loopback err-disable state on Fa0/24 Oct 6 14:09:55: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to up Oct 6 14:09:57: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up Oct 6 14:09:57: %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/24.
Any further word on the more in depth explanation? Interested from both a customer perspective and a technical perspective - good to learn from these things. Regards, Anton