Cisco Systems 3750E Removing Dynamic Address Entries, Configuring MAC Address Notification Traps

Chapter 7 Administering the Switch

Managing the MAC Address Table

Beginning in privileged EXEC mode, follow these steps to configure the dynamic address table aging time:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	mac address-table aging-time [0	Set the length of time that a dynamic entry remains in the MAC
	10-1000000] [vlan vlan-id]	address table after the entry is used or updated.
		The range is 10 to 1000000 seconds. The default is 300. You can also
		enter 0, which disables aging. Static address entries are never aged
		or removed from the table.
		For vlan-id, valid IDs are 1 to 4094.
Step 3
	end	Return to privileged EXEC mode.
Step 4
	show mac address-table aging-time	Verify your entries.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To return to the default value, use the no mac address-tableaging-timeglobal configuration command.

Removing Dynamic Address Entries

To remove all dynamic entries, use the clear mac address-table dynamic command in privileged EXEC mode. You can also remove a specific MAC address (clear mac address-table dynamic address mac-address), remove all addresses on the specified physical port or port channel (clear mac address-table dynamic interface interface-id), or remove all addresses on a specified VLAN (clear mac address-table dynamic vlan vlan-id).

To verify that dynamic entries have been removed, use the show mac address-table dynamic privileged EXEC command.

Configuring MAC Address Notification Traps

MAC address notification enables you to track users on a network by storing the MAC address activity on the switch. Whenever the switch learns or removes a MAC address, an SNMP notification can be generated and sent to the NMS. If you have many users coming and going from the network, you can set a trap interval time to bundle the notification traps and reduce network traffic. The MAC notification history table stores the MAC address activity for each hardware port for which the trap is enabled. MAC address notifications are generated for dynamic and secure MAC addresses; events are not generated for self addresses, multicast addresses, or other static addresses.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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