SNMP trap when MAC address table changes
An SNMP trap is generated when a laptop/PC is removed from the back of an IP phone and the laptop/PC MAC address ages out of the MAC table for the Switch 2920 and 5400 series switch.
The mac-notify trap feature globally enables the generation of SNMP trap notifications on MAC address table changes (learns/moves/removes/ages.)
The following command enables trap for aged MAC addresses: