Chapter 26 Configuring Port-Based Traffic Control

Configuring Port Security

Enabling and Configuring Port Security

Beginning in privileged EXEC mode, follow these steps to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port:

 

Command

Purpose

Step 1

 

 

configure terminal

Enter global configuration mode.

Step 2

 

 

interface interface-id

Specify the interface to be configured, and enter interface configuration

 

 

mode.

Step 3

 

 

switchport mode {access trunk}

Set the interface switchport mode as access or trunk; an interface in the

 

 

default mode (dynamic auto) cannot be configured as a secure port.

Step 4

 

 

switchport voice vlan vlan-id

Enable voice VLAN on a port.

 

 

vlan-id—Specify the VLAN to be used for voice traffic.

Step 5

 

 

switchport port-security

Enable port security on the interface.

Step 6

 

 

switchport port-security

(Optional) Set the maximum number of secure MAC addresses for the

 

[maximum value [vlan {vlan-list

interface. The maximum number of secure MAC addresses that you can

 

{access voice}}]]

configure on a switch or switch stack is set by the maximum number of

 

 

available MAC addresses allowed in the system. This number is set by the

 

 

active Switch Database Management (SDM) template. See Chapter 8,

 

 

“Configuring the Switch SDM Template.”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 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.

 

 

 

 

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

26-12

OL-9775-02

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Cisco Systems 3750E manual Enabling and Configuring Port Security, 26-12