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Catalyst 2960 Switch Software Configuration Guide
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Chapter 6 Administering the Switch
Managing the MAC Address Table
To disable the switch from sending MAC address notification traps, use the no snmp-server enable
traps mac-notification global configuration command. To disable the MAC address notification traps
on a specific interface, use the no snmp trap mac-notification {added | removed} interface
configuration command. To disable the MAC address notification feature, use the no mac address-table
notification global configuration command.
This example shows how to specify 172.20.10.10 as the NMS, enable the switch to send MAC address
notification traps to the NMS, enable the MAC address notification feature, set the interval time to
60 seconds, set the history-size to 100 entries, and enable traps whenever a MAC address is added on the
specified port.
Switch(config)# snmp-server host 172.20.10.10 traps private
Switch(config)# snmp-server enable traps mac-notification
Switch(config)# mac address-table notification
Switch(config)# mac address-table notification interval 60
Switch(config)# mac address-table notification history-size 100
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# snmp trap mac-notification added
You can verify the previous commands by entering the show mac address-table notification interface
and the show mac address-table notification privileged EXEC commands.
Adding and Removing Static Address Entries
A static address has these characteristics:
• It is manually entered in the address table and must be manually removed.
• It can be a unicast or multicast address.
• It does not age and is retained when the switch restarts.
You can add and remove static addresses and define the forwarding behavior for them. The forwarding
behavior defines how a port that receives a packet forwards it to another port for transmission. Because
all ports are associated with at least one VLAN, the switch acquires the VLAN ID for the address from
the ports that you specify. You can specify a different list of destination ports for each source port.
A packet with a static address that arrives on a VLAN where it has not been statically entered is flooded
to all ports and not learned.
You add a static address to the address table by specifying the destination MAC unicast address and the
VLAN from which it is received. Packets received with this destination address are forwarded to the
interface specified with the interface-id option.
Step 9
show mac address-table notification interface
show running-config
Verify your entries.
Step 10
copy running-config startup-config (Optional) Save your entries in the configuration
file.
Command Purpose