PurposeCommand or Action
• access—On an access port, specifies the VLAN as an access VLAN.
• voice—On an access port, specifies the VLAN as a voice VLAN.
The voice keyword is available only if a voice VLAN is configured
on a port and if that port is not the access VLAN. If an interface is
configured for voice VLAN, configure a maximum of two secure MAC
addresses.
Note
(Optional) Sets the violation mode, the action to be taken when a security
violation is detected, as one of these:
switchport port-security violation
{protect | restrict | shutdown |
shutdown vlan}
Step 9
• protect—When the number of port secure MAC addresses reaches the
maximum limit allowed on the port, packets with unknown source
Example:
Switch(config-if)# switchport
addresses are dropped until you remove a sufficient number of secure
MAC addresses to drop below the maximum value or increase the number
of maximum allowable addresses. You are not notified that a security
violation has occurred.
port-security violation restrict
We do not recommend configuring the protect mode on a trunk
port. The protect mode disables learning when any VLAN reaches
its maximum limit, even if the port has not reached its maximum
limit.
Note
• 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. An SNMP trap is sent, a
syslog message is logged, and the violation counter increments.
• shutdown—The interface is error-disabled when a violation occurs, and
the port LED turns off. An SNMP trap is sent, a syslog message is logged,
and the violation counter increments.
• shutdown vlan—Use to set the security violation mode per VLAN. In
this mode, the VLAN is error disabled instead of the entire port when a
violation occurs.
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. You can
manually re-enable it by entering the shutdown and no shutdown
interface configuration commands or by using the clear
errdisable interface vlan privileged EXEC command.
Note
(Optional) Enters a secure MAC address for the interface. You can use this
command to enter the maximum number of secure MAC addresses. If you
switchport port-security [mac-address
mac-address [vlan {vlan-id | {access |
voice}}]
Step 10
configure fewer secure MAC addresses than the maximum, the remaining MAC
addresses are dynamically learned.
Example:
Switch(config-if)# switchport
If you enable sticky learning after you enter this command, the secure
addresses that were dynamically learned are converted to sticky secure
MAC addresses and are added to the running configuration.
Note
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
1489
How to Configure Port Security
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