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Layer 2 Learning and Forwarding for Bridge Domains Overview

When you configure a bridge domain, Layer 2 address learning is enabled by default. The bridge domain learns unicast media access control (MAC) addresses to avoid flooding the packets to all the ports in the bridge domain. Each bridge domain creates a source MAC entry in its source and destination MAC tables for each source MAC address learned from packets received on the ports that belong to the bridge domain.

Note:

Traffic is not flooded back onto the interface on which it was received.

You can optionally disable MAC learning either for the entire router or for a specific bridge domain. You can also configure the following Layer 2 learning and forwarding properties:

  • Static MAC entries on logical interfaces

  • Size of the MAC address table for the bridge domain