23of port A. Other hosts using the forged MAC address of Host A cannot obtain the frames destined forHost A.Types of MAC address entriesA MAC address table can contain the following types of entries:• Static entries—A static entry is manually added to forward frames with a specific destination MACaddress out of the associated interface, and it never ages out. A static entry has higher priority thana dynamically learned one.• Dynamic entries—A dynamic entry can be manually configured or dynamically learned to forwardframes with a specific destination MAC address out of the associated interface. A dynamic entrymight age out. A manually configured dynamic entry has the same priority as a dynamicallylearned one.• Blackhole entries—A blackhole entry is manually configured and never ages out. A blackhole entryis configured for filtering out frames with a specific source or destination MAC address. For example,to block all frames destined for a specific user for security concerns, you can configure the MACaddress of this user as a blackhole MAC address entry.• Multiport unicast entries—A multiport unicast entry is manually added to send frames with aspecific unicast destination MAC address out of multiple ports, and it never ages out. A multiportunicast entry has higher priority than a dynamically learned one.A static, blackhole, or multiport unicast MAC address entry can overwrite a dynamic MAC address entry,but not vice versa.MAC address table configuration task listThe configuration tasks discussed in the following sections can be performed in any order.This document covers only the configuration of unicast MAC address entries, including static, dynamic,blackhole, and multiport unicast MAC address entries. For information about configuring static multicastMAC address entries, see IP Multicast Configuration Guide. For information about MAC address tableconfiguration in VPLS, see MPLS Configuration Guide.To configure the MAC address table, perform the following tasks:Tasks at a glance(Optional.) Configuring MAC address entries• Adding or modifying a static or dynamic MAC address entry globally• Adding or modifying a static or dynamic MAC address entry on an interface• Adding or modifying a blackhole MAC address entry• Adding or modifying a multiport unicast MAC address entry(Optional.) Disabling MAC address learning(Optional.) Configuring the aging timer for dynamic MAC address entries(Optional.) Configuring the MAC learning limit on an interface(Optional.) Configuring the device to forward unknown frames after the MAC learning limit on an interface isreached(Optional.) Assigning MAC learning priority to an interface
