25-8
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
Chapter 25 Configuring Port-Based Traffic Control
Configuring Port Security
These sections contain this conceptual and configuration information:
•
Understanding Port Security, page 25-8
•
Default Port Security Configuration, page 25-10
•
Port Security Configuration Guidelines, page 25-10
•
Enabling and Configuring Port Security, page 25-12
•
Enabling and Configuring Port Security Aging, page 25-16
•
Port Security and Switch Stacks, page 25-17
•
Port Security and Private VLANs, page 25-17
Understanding Port Security
These sections contain this conceptual information:
•
Secure MAC Addresses, page 25-8
•
Security Violations, page 25-9
Secure MAC Addresses
You configure the maximum number of secure addresses allowed on a port by using the switchport
port-security maximum value interface configuration command.
Note
If you try to set the maximum value to a number less than the number of secure addresses already
configured on an interface, the command is rejected.
The switch supports these types of secure MAC addresses:
•
Static secure MAC addresses—These are manually configured by using the switchport
port-security mac-address mac-address interface configuration command, stored in the address
table, and added to the switch running configuration.
•
Dynamic secure MAC addresses—These are dynamically configured, stored only in the address
table, and removed when the switch restarts.
•
Sticky secure MAC addresses—These can be dynamically learned or manually configured, stored in
the address table, and added to the running configuration. If these addresses are saved in the
configuration file, when the switch restarts, the interface does not need to dynamically reconfigure
them.
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. To enable sticky learning, enter
the switchport port-security mac-address sticky interface configuration command. When you enter
this command, the interface converts all the dynamic secure MAC addresses, including those that were
dynamically learned before sticky learning was enabled, to sticky secure MAC addresses. All sticky
secure MAC addresses are added to the running configuration.
The sticky secure MAC addresses do not automatically become part of the configuration file, which is
the startup configuration used each time the switch restarts. If you save the sticky secure MAC addresses
in the configuration file, when the switch restarts, the interface does not need to relearn these addresses.
If you do not save the sticky secure addresses, they are lost.
