Users Guide

Layer 2 Switching Commands 333
MAC Notification Commands
mac address-table notification change
Use this command to enable and configure MAC address change notification.
Use the no form of the command to return the configuration to the default.
Syntax
mac address-table notification change [history size | interval seconds ]>
no mac address-table notification change
•
size — Configure the size of the MAC address table buffer. The range is
1 to 255.
•
seconds — Configure the SNMP trap notification interval. The range is 1
to 2,147,483,647 seconds.
Default Configuration
MAC address notification is disabled by default.
The default history size is 255.
The default notification interval is 1 second.
Command Mode
Global Configuration mode
User Guidelines
MAC address notification allows the operator to receive an SNMP trap or
inform when a MAC address is learned by the switch or the MAC address ages
out of the MAC address table. MAC movement is not tracked.
Setting the interval to 1 causes the trap/inform to be sent immediately on the
occurrence of any event. This may cause CPU congestion if a large number of
events occurs in a short period of time.
MAC notification maintains a history buffer of MAC address changes that
have not yet been transmitted. The MAC address table history buffer is a
finite resource. It is indexed in a circular manner, overwriting older entries.