Version 12.2(44)SE5
"WS-C2960G-24TC-L"
interface GigabitEthernet0/6
switchport access vlan 91
switchport mode access
switchport voice vlan 93
switchport port-security maximum 2
switchport port-security
switchport port-security aging time 10
storm-control broadcast level 0.50
storm-control multicast level 0.50
storm-control action trap
spanning-tree portfast
end
Dec 13 10:27:18.433: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/6, changed state to up
Dec 13 10:27:19.431: %ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Collisions at GigabitEthernet0/6 exceed threshold. Considered as loop-back.
Dec 13 10:27:19.431: %PM-4-ERR_DISABLE: loopback error detected on Gi0/6, putting Gi0/6 in err-disable state
Dec 13 10:27:20.446: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/6, changed state to down
Dec 13 10:27:21.444: %LINK-3-UPDOWN: Interface GigabitEthernet0/6, changed state to down
Dec 13 10:30:19.426: %PM-4-ERR_RECOVER: Attempting to recover from loopback err-disable state on Gi0/6
and on our monitor server we see the following error from the switch:
<187>35255: Dec 11 11:09:50.604: %STORM_CONTROL-3-FILTERED: A Multicast storm detected on Gi0/6. A packet filter action has been applied on the interface.
