21-12
Catalyst 2960 Switch SoftwareConfiguration Guide
78-16881-01
Chapter21 Configuring Port-Based Traffic Control
Configuring Port Security
Step6 switchport port-security
[maximum value [vlan {vlan-list |
{access | voice}}]]
(Optional) Set the maximum number of secure MAC addresses for the
interface. The maximum number of secure MAC addresses that you can
configure on a switch is set by the maximum number of available MAC
addresses allowed in the system. This number is the total of available MAC
addresses, including those used for other Layer 2 functions and any other
secure MAC addresses configured on interfaces.
(Optional) vlan—set a per-VLAN maximum value
Enter one of these options after you enter the vlan keyword:
•vlan-list—On a trunk port, you can set a per-VLAN maximum value on
a range of VLANs separated by a hyphen or a series of VLANs separated
by commas. For nonspecified VLANs, the per-VLAN maximum value is
used.
•access—On an access port, specify the VLAN as an access VLAN.
•voice—On an access port, specify the VLAN as a voice VLAN.
Note The voice keyword is available only if voice VLAN is configured on
a port and if that port is not the access VLAN.
Step7 switchport port-security violation
{protect | restrict | shutdown}
(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 port secure MAC addresses reaches the
maximum limit allowed on the port, packets with unknown source
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.
Note We do not recommend configuring the protect mode on a trunk port.
The protect mode disables learning when any VLAN reaches i ts
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. An SNMP tra p is
sent, a syslog m essage is logge d, 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.
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 noshutdown
interface configuration commands.
Command Purpose