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 Resolution:

 

To avoid unexpected outages in future, it is recommended to do periodic check in network and block unwanted ports manually and also to check discarding ports.
 
Root Cause:
 
The link was down due to the port went to discarding state.
 
Trouble Reason:
 
The link was down
 
Recovery action:
 
Root Protection disabled on the ports which went to discarding state.
 
Closure Note:
 
The link is up and stable. Ticket closed post observation. RFO : STP port discarding issue.