Cisco 3560G 48TS Software Configuration Guide - Page 401

Chapter 20 Configuring Port-Based Traffic Control Configuring Port Security This example shows how to block unicast and multicast flooding on a port: Switch# configure terminal Switch(config)# interface gigabitethernet0/1 Switch(config-if)# switchport block multicast Switch(config-if)# switchport block unicast Switch(config-if)# end Configuring Port Security You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port. If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged. These sections include port security configuration information and procedures: • Understanding Port Security, page 20-7 • Default Port Security Configuration, page 20-10 • Configuration Guidelines, page 20-10 • Enabling and Configuring Port Security, page 20-11 • Enabling and Configuring Port Security Aging, page 20-14 Understanding Port Security This section contains information about these topics: • Secure MAC Addresses, page 20-8 • Security Violations, page 20-9 78-16156-01 Catalyst 3560 Switch Software Configuration Guide 20-7