Cisco Catalyst 4500 Series - Removing Dynamic Address Entries

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 4 Administering the Switch
Managing the MAC Address Table
Removing Dynamic Address Entries
To remove all dynamic entries, use the clear mac address-table dynamic command in 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 Change Notification Traps
MAC change notification allows you to track users on a network by storing the MAC change activity on
the switch. Whenever the switch learns or removes a MAC address, an SNMP notification can be
generated and sent to the network management system. If you have many users entering and exiting 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 static MAC addresses; events are
not generated for self addresses or multicast addresses.
To send MAC change notification traps to an NMS host, perform this task:
Step 4
show mac address-table aging-time
Verifies your entries.
Step 5
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
snmp-server host host-addr [traps | informs] {version
{
1|2c|3}} [auth | noauth | priv] community-string
[udp-port port] [notification-type]
Specifies 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.