I have port security configured as follows:
switchport access vlan 196 switchport mode access switchport port-security switchport port-security aging time 3 switchport port-security violation restrict switchport port-security aging type inactivity switchport port-security mac-address sticky
And on the jack is a Dell Computer. Twice this week the user has called the Help Desk complaining that they don't have network access and both times I discovered that sticky had learned her mac address as "vlan voice" (no voice vlan is configured) as shown:
switchport port-security mac-address sticky xxxx.xxxx.xxxx vlan voice
If I simply clear sticky on this port it relearns it as "vlan access" and everything is fine (at least for a day or so). Any idea why this is happening?