Cisco Systems 3750E manual Adding and Removing Static Address Entries

Chapter 7 Administering the Switch

Managing the MAC Address Table

	Command	Purpose
Step 9
	show mac address-table notification interface	Verify your entries.
	show running-config
Step 10
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To disable the switch from sending MAC address notification traps, use the no snmp-server enable traps mac-notificationglobal 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 gigabitethernet1/0/2

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-idoption.

When you configure a static MAC address in a private-VLAN primary or secondary VLAN, you should also configure the same static MAC address in all associated VLANs. Static MAC addresses configured in a private-VLAN primary or secondary VLAN are not replicated in the associated VLAN. For more information about private VLANs, see Chapter 16, “Configuring Private VLANs.”

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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