The port g1/1/3 is getting blocked by STP on VLAN75.
After there are MAC flapping messages for multiple MACs in VLAN75 in that port. Hence the switch is building the MAC table for packets received on g1/1/3.
My understanding was that a port in blocked state will discard packets, so how come it looks at the packets on that port? Am I wrong?
Name Blocked Interfaces List
-------------------- ------------------------------------
VLAN0010 Gi1/1/3
VLAN0010 Gi3/1/4
VLAN0075 Gi1/1/3
VLAN0075 Gi3/1/4
VLAN0085 Gi1/1/3
VLAN0085 Gi3/1/4
VLAN0120 Gi1/1/3
VLAN0120 Gi3/1/4
VLAN0150 Gi1/1/3
Number of blocked ports (segments) in the system : 9
xxx#
Sep 13 09:11:08.296: %SW_MATM-4-MACFLAP_NOTIF: Host 881d.fc96.8041 in vlan 10 is flapping between port Po1 and port Gi1/1/3
Sep 13 09:11:08.690: %SW_MATM-4-MACFLAP_NOTIF: Host 40a8.f0a3.29f6 in vlan 75 is flapping between port Gi1/1/3 and port Po1
Sep 13 09:11:09.185: %SW_MATM-4-MACFLAP_NOTIF: Host 40a8.f0a2.6473 in vlan 75 is flapping between port Po1 and port Gi1/1/3
