I have 15 clusters of 3 x 3550's and 3 x 4506's with port-security configured on all access ports. Every day I experience random pot lockouts, on again random switches due to err-disable. Reason, switch seen MAC address 5258.5f55.55.c5 or address e8be.5bd3.5558 on port? The times indicate that this happens when clients either logon or logoff. We have update all drivers on the clients which are a mix of Dell's and Compaq's. Anyone came across this behaviour before? Port config attached.
switchport access vlan 11
switchport mode access
switchport port-security mac-address sticky
switchport port-security mac-address sticky 000b.db43.a5e5
no ip address