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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 6 Configuring the System
Managing the MAC Address Tables
Adding Secure Addresses
The secure address table contains secure MAC addresses and their associated ports and VLANs. A
secure address is a manually entered unicast address or dynamically learnt 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.
Beginning in privileged EXEC mode, follow these steps to add a secure address:
Removing Secure Addresses
Beginning in privileged EXEC mode, follow these steps to remove a secure address:
You can remove all secure addresses by using the clear mac-address-table secure command in
privileged EXEC mode.
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.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Identify a specific interface for configuration, and enter interface
configuration mode.
Step 3
switchport port-security mac
address mac-address
Add a secure address.
Step 4
end Return to privileged EXEC mode.
Step 5
show mac-address-table secure Verify your entry.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
no switchport port-security
mac address mac-address
Remove a secure address.
Step 3
end Return to privileged EXEC mode.
Step 4
show mac-address-table secure Verify your entry.
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