Symptom
When Loop-back detected, the port will put the port in err-disable state, but err-disable SNMP packet cannot send out.
But when storm-control error detected, after putting port in err-disable state, the SNMP packets is sent out normally.
Conditions
WS-C2960-24-S
WS-C2960-8TC-S
c2960-lanlitek9 XXX image.