R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

Types of MAC address entries

A 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 MAC

address out of the associated interface, and it never ages out. A static entry has higher priority than

a dynamically learned one.

• Dynamic entries—A dynamic entry can be manually configured or dynamically learned to forward

frames with a specific destination MAC address out of the associated interface. A dynamic entry

might age out. A manually configured dynamic entry has the same priority as a dynamically

learned one.

• Blackhole entries—A blackhole entry is manually configured and never ages out. A blackhole entry

is configured for filtering out frames with a specific destination MAC address. For example, to block

all frames destined for a user, you can configure the MAC address of the user as a blackhole MAC

address entry.

A static or blackhole MAC address entry can overwrite a dynamic MAC address entry, but not vice

versa.

Feature and hardware compatibility

This feature is supported only on Layer 2 interface cards on MSR routers.

MAC address table configuration task list

The 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,

and blackhole MAC address entries. For information about configuring static multicast MAC address

entries, see IP Multicast 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

(Optional.) Disabling MAC address learning on an interface

(Optional.) Configuring the aging timer for dynamic MAC address entries

Configuring MAC address entries

Configuration guidelines

• You cannot add a dynamic MAC address entry if a learned entry already exists with a different

outgoing interface for the MAC address.