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Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
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Chapter5 Administering the Switch
Managing the MAC Address Table
Beginning in privileged EXEC mode, follow these steps to configure the dynamic address table aging
time:
To return to the default value, use the no mac addr ess-table aging-time global configuration command.
Removing Dynamic Address Entries
To remove all dynamic entries, use the clear mac address-table dynamic comman d 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 hav e be en remo v ed, use th e show mac addr ess-table dynamic pri vileged
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 activ ity fo r ea ch har dwa re p ort f or which th e tra p is en able d. MAC
address notifications are generated for dynamic and secure MAC addresses; events are not generated for
self addresses, multicast addresses, or other static addresses.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 mac address-table aging-time [0 |
10-1000000] [vlan vlan-id]Set the length of time that a dynamic entry remains in the MAC
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. Do not enter leading zeros.
Step3 end Return to privileged EXEC mode.
Step4 show mac address-table aging-time Verify your entries.
Step5 copy running-config startup-config (Optional) Save your entries in the configuration file.