EVPN MAC pinning

Junos OS enables MAC pinning for Ethernet VPN (EVPN), including customer edge (CE) interfaces and EVPN over MPLS core in both all-active mode and single-active mode. A MAC address pinned over CE interfaces in EVPN is synchronized to remote EVPN PE devices by adding the Sticky bit (in accordance with RFC 7432, Section 7.7, MAC Mobility Extended Community). On a remote EVPN PE device, a MAC address received with Sticky bit enabled is pinned over the MPLS core. A pinned MAC address cannot be moved to a different interface. When a MAC address is pinned locally in a bridge domain, the address is synchronized to remote EVPN PE devices. The interface with the locally pinned MAC address discards traffic sent from any other interface that has the identical MAC address if it is learned locally in the bridge domain.