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9.1. Local Learning

9.1. Local Learning​

A particular PE must be able to learn the MAC addresses from the CEs that are connected to it. This is referred to as local learning.

The PEs in a particular EVPN instance MUST support local data-plane learning using standard IEEE Ethernet learning procedures. A PE must be capable of learning MAC addresses in the data plane when it receives packets such as the following from the CE network:

  • DHCP requests

  • An ARP Request for its own MAC

  • An ARP Request for a peer

Alternatively, PEs MAY learn the MAC addresses of the CEs in the control plane or via management-plane integration between the PEs and the CEs.

There are applications where a MAC address that is reachable via a given PE on a locally attached segment (e.g., with ESI X) may move, such that it becomes reachable via another PE on another segment (e.g., with ESI Y). This is referred to as "MAC Mobility". Procedures to support this are described in Section 15 ("MAC Mobility").

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