Configuring MAC Information
The MAC Information feature can generate syslog messages or SNMP notifications when MAC address entries are learned or deleted. You can use these messages to monitor users leaving or joining the network and analyze network traffic.
The MAC Information feature buffers the MAC change syslog messages or SNMP notifications in a queue. The device overwrites the oldest MAC address change written into the queue with the most recent MAC address change when the following conditions exist:
The MAC change notification interval does not expire.
The queue has been exhausted.
To send a syslog message or SNMP notification immediately after it is created, set the queue length to zero.
The device writes information and sends messages only for the following MAC addresses:
Dynamic MAC addresses.
MAC addresses that pass MAC authentication.
MAC addresses that pass 802.1X authentication.
Secure MAC addresses.
The device does not write information or send messages for blackhole MAC addresses, static MAC addresses, multiport unicast MAC addresses, multicast MAC addresses, and local MAC addresses.
For more information about MAC authentication, 802.1X, and secure MAC addresses, see Security Configuration Guide.