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Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
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Chapter8 Administering the Switch
Managing the MAC Address Table
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.
Beginning in privileged EXEC mode, follow these steps to configure the switch to send MAC address
notification traps to an NMS host:
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 snmp-server host host-addr {traps | informs} {version {1
| 2c | 3}} community-string notification-type Specify the recipient of the trap message.
•For host-addr, specify the name or address of the
NMS.
•Specify traps (the default) to send SNMP traps
to the host. Specify informs to send SNMP
informs to the host.
•Specify the SNMP version to support. Version 1,
the default, is not available with informs.
•For community-string, specify the string to send
with the notification operation. Though you can
set this string by using the snmp-server host
command, we recommend that you define this
string by using the snmp-server community
command before using the snmp-server host
command.
•For notification-type, use the mac-notification
keyword.
Step3 snmp-server enable traps mac-notification Enable the switch to send MAC address traps to the
NMS.
Step4 mac address-table notification Enable the MAC address notification feature.