Cisco Catalyst 3550 series Software Configuration Manual page 460

Configuring Port Security
Command
Step 6 switchport port-security violation
{protect | restrict | shutdown}
Step 7
switchport port-security mac-address
mac-address [vlan vlan-id]
Step 8
switchport port-security mac-address
sticky
Step 9
end
Step 10 show port-security
Step 11
copy running-config startup-config
Catalyst 3550 Multilayer Switch Software Configuration Guide
21-12
Purpose
(Optional) Set the violation mode, the action to be taken when a security
violation is detected, as one of these:
• protect—When the number of secure MAC addresses reaches the
limit allowed on the port, packets with unknown source addresses
are dropped until you remove a sufficient number of secure MAC
addresses or increase the number of maximum allowable addresses.
You are not notified that a security violation has occurred.
We do not recommend enabling the protect mode on a trunk
Note
port. The protect mode disables learning when any VLAN
reaches its maximum limit, even if the port has not reached its
maximum limit.
• restrict—When the number of secure MAC addresses reaches the
limit allowed on the port, packets with unknown source addresses
are dropped until you remove a sufficient number of secure MAC
addresses or increase the number of maximum allowable addresses.
In this mode, you are notified that a security violation has occurred.
Specifically, an SNMP trap is sent, a syslog message is logged, and
the violation counter increments.
shutdown—In this mode, a port security violation causes the
•
interface to immediately become error-disabled, and turns off the
port LED. It also sends an SNMP trap, logs a syslog message, and
increments the violation counter.
Note When a secure port is in the error-disabled state, you can bring
it out of this state by entering the errdisable recovery cause
psecure-violation global configuration command, or you can
manually re-enable it by entering the shutdown and no
shutdown interface configuration commands.
(Optional) Enter a static secure MAC address for the interface, repeating
the command as many times as necessary. You can use this command to
enter the maximum number of secure MAC addresses. If you configure
fewer secure MAC addresses than the maximum, the remaining MAC
addresses are dynamically learned.
(Optional) On a trunk port, you can specify the VLAN ID along with the
MAC address. If no VLAN ID is specified, the native VLAN is used.
If you enable sticky learning after you enter this command, the
Note
secure addresses that were dynamically learned are converted to
sticky secure MAC addresses and are added to the running
configuration.
(Optional) Enable sticky learning on the interface.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 21 Configuring Port-Based Traffic Control
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