Removing Dynamic Address Entries; Configuring Mac Address Change Notification Traps - Cisco Catalyst 2960 Software Configuration Manual
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Managing the MAC Address Table
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 Change Notification Traps
MAC address change notification tracks users on a network by storing the MAC address change activity.
When the switch learns or removes a MAC address, an SNMP notification trap can be 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 to reduce network traffic. The MAC notification history table stores MAC address
activity for each port for which the trap is set. MAC address change notifications are generated for
dynamic and secure MAC addresses. Notifications 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
change notification traps to an NMS host:
Command
Step 1
configure terminal
Step 2
snmp-server host host-addr {traps | informs} {version {1
| 2c | 3}} community-string notification-type
Step 3
snmp-server enable traps mac-notification change
Step 4
mac address-table notification change
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
5-16
Chapter 5
Purpose
Enter global configuration mode.
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.
Enable the switch to send MAC address change
notification traps to the NMS.
Enable the MAC address change notification feature.
Administering the Switch
OL-26520-01
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