Configuring and Monitoring Port Security
Port Security
Retention of Static Addresses
Static MAC addresses do not age-out. MAC addresses learned by using learn-
mode continuous or learn-mode limited-continuous age out according to the
currently configured MAC age time. (For information on the mac-age-time
command, refer to the chapter titled “Interface Access and System Informa-
tion” in the Management and Configuration Guide for your switch.
Learned Addresses. In the following two cases, a port in Static learn mode
retains a learned MAC address even if you later reboot the switch or disable
port security for that port:
■ The port learns a MAC address after you configure the port for Static learn
mode in both the startup-config file and the running-config file (by exe-
cuting the write memory command).
■ The port learns a MAC address after you configure the port for Static learn
mode in only the running-config file and, after the address is learned, you
execute write memory to configure the startup-config file to match the
running-config file.
To remove an address learned using either of the preceding methods, do one
of the following:
■ Delete the address by using no port-security < port-number > mac-address
< mac-addr >.
■ Download a configuration file that does not include the unwanted MAC
address assignment.
■ Reset the switch to its factory-default configuration.
Assigned/Authorized Addresses. : If you manually assign a MAC address
(using port-security <port-number> address-list <mac-addr>) and then execute
write memory, the assigned MAC address remains in memory until you do one
of the following:
■ Delete it by using no port-security < port-number > mac-address < mac-addr >.
■ Download a configuration file that does not include the unwanted MAC
address assignment.
■ Reset the switch to its factory-default configuration.
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