Cisco WS-C2960-24TC-S Software Guide - Page 131
Configuring Unicast MAC Address Filtering, mac address-table static, interface, con terminal
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Chapter 6 Administering the Switch Managing the MAC Address Table Configuring Unicast MAC Address Filtering When unicast MAC address filtering is enabled, the switch drops packets with specific source or destination MAC addresses. This feature is disabled by default and only supports unicast static addresses. Follow these guidelines when using this feature: • Multicast MAC addresses, broadcast MAC addresses, and router MAC addresses are not supported. If you specify one of these addresses when entering the mac address-table static mac-addr vlan vlan-id drop global configuration command, one of these messages appears: % Only unicast addresses can be configured to be dropped % CPU destined address cannot be configured as drop address • Packets that are forwarded to the CPU are also not supported. • If you add a unicast MAC address as a static address and configure unicast MAC address filtering, the switch either adds the MAC address as a static address or drops packets with that MAC address, depending on which command was entered last. The second command that you entered overrides the first command. For example, if you enter the mac address-table static mac-addr vlan vlan-id interface interface-id global configuration command followed by the mac address-table static mac-addr vlan vlan-id drop command, the switch drops packets with the specified MAC address as a source or destination. If you enter the mac address-table static mac-addr vlan vlan-id drop global configuration command followed by the mac address-table static mac-addr vlan vlan-id interface interface-id command, the switch adds the MAC address as a static address. You enable unicast MAC address filtering and configure the switch to drop packets with a specific address by specifying the source or destination unicast MAC address and the VLAN from which it is received. Beginning in privileged EXEC mode, follow these steps to configure the switch to drop a source or destination unicast static address: Step 1 Step 2 Command configure terminal mac address-table static mac-addr vlan vlan-id drop Step 3 Step 4 Step 5 end show mac address-table static copy running-config startup-config Purpose Enter global configuration mode. Enable unicast MAC address filtering and configure the switch to drop a packet with the specified source or destination unicast static address. • For mac-addr, specify a source or destination unicast MAC address. Packets with this MAC address are dropped. • For vlan-id, specify the VLAN for which the packet with the specified MAC address is received. Valid VLAN IDs are 1 to 4094. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To disable unicast MAC address filtering, use the no mac address-table static mac-addr vlan vlan-id global configuration command. OL-8603-04 Catalyst 2960 Switch Software Configuration Guide 6-25
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