Cisco 2950 Software Configuration Guide - Page 462
Enabling and Configuring Port Security
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Configuring Port Security Chapter 22 Configuring Port-Based Traffic Control 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: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Command configure terminal interface interface-id switchport mode access switchport port-security switchport port-security maximum value switchport port-security violation {protect | restrict | shutdown} switchport port-security mac-address mac-address Purpose Enter global configuration mode. Specify the interface to configure and enter interface configuration mode. Set the interface mode as access; an interface in the default mode (dynamic desirable) cannot be configured as a secure port. Enable port security on the interface. (Optional) Set the maximum number of secure MAC addresses for the interface. The range is 1 to 132; the default is 1. (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. • 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. Note 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. 22-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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