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Layer 2 Address Learning and Forwarding Properties Overview

On MX-series routers only, you can configure Layer 2 address learning and forwarding properties in support of Layer 2 bridging. The router learns unicast media access control (MAC) addresses to avoid flooding the packets to all the ports in a bridge domain. The router creates a source MAC entry in its source and destination MAC tables for each MAC address learned from packets received on ports that belong to the bridge domain.

By default, Layer 2 address learning is enabled. You can disable MAC learning for the router or for a specific bridge domain or logical interfaces. You can also configure the following Layer 2 forwarding properties for an MX-series router:

Timeout interval for MAC entries
MAC accounting
A limit to the number of MAC addresses learned from the logical interfaces

For more information about how to configure bridge domains and virtual switches, see Configuring Layer 2 Bridging and Configuring Layer 2 Virtual Switches.

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