I have a Distribution layer switch connected to an access layer switch through GigabitEthernet link. This link went down and I am seeing the following message on the access layer switch:
Dec 17 22:41:51.073 est: %PM-4-ERR_DISABLE: udld error detected on Gi0/1, putting Gi0/1 in err-disable state
Dec 17 22:41:52.073 est: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
Dec 17 22:41:53.085 est: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to down
Please let me know how to fix this?
Thanks in advance.