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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 7 Administering the Switch
Managing the MAC Address Table
Beginning in privileged EXEC mode, follow these steps to add a static address:
To remove static entries from the address table, use the no mac address-table static mac-addr vlan
vlan-id interface interface-id global configuration command.
This example shows how to add the static address c2f3.220a.12f4 to the MAC address table. When a
packet is received in VLAN 4 with this MAC address as its destination address, the packets is forwarded
to the specified interface:
Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 interface
gigabitethernet0/1
Adding and Removing Secure Addresses
A secure address is a manually entered unicast address or dynamically learned address that is forwarded
to only one port per VLAN. If you enter a static address that is already assigned to another port, the
request will be rejected.
Secure addresses can be learned dynamically if the configured secure addresses do not reach the
maximum limit of the port.
You can configure an interface to convert the dynamic MAC addresses to sticky secure MAC addresses
and to add them to the running configuration by enabling sticky learning. When sticky learning is
enabled, the interface converts all the dynamic secure MAC addresses, including those that were learned
dynamically before sticky learning is enabled, to sticky secure MAC addresses. It adds all the sticky
secure MAC addresses to the running configuration. For more information, see the “Secure MAC
Addresses” section on page 18-5.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mac address-table static mac-addr
vlan vlan-id interface interface-id
Add a static address to the MAC address table.
• For mac-addr, specify the destination MAC address (unicast or
multicast) to add to the address table. Packets with this destination
address received in the specified VLAN are forwarded to the
specified interface.
• For vlan-id, specify the VLAN for which the packet with the
specified MAC address is received. Valid VLAN IDs are 1 to 4094
when the EI is installed and 1 to 1005 when the SI is installed; do not
enter leading zeros.
• For interface-id..., specify the interface to which the received packet
is forwarded. Valid interfaces include physical ports.
Step 3
end Return to privileged EXEC mode.
Step 4
show mac address-table static Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.