MAC pinning support for PBB-EVPN

The MAC pinning feature is enabled on provider backbone bridging (PBB) and Ethernet VPN (EVPN) integration, including customer edge (CE) interfaces and EVPN over PBB core in both all-active or single-active mode.

To configure MAC pinning for PBB-EVPN, include the mac-pinning statement at the [edit routing-instances pbbn protocols evpn], where pbbn is the PBB routing instance over backbone port (B-component). With this configuration, the dynamically learned MAC addresses in the PBB I-component (customer routing instance) bridge domain over CE interfaces, as well as PBB-MPLS core interfaces are pinned. This prevents MAC move on duplicate MAC detection, avoiding loop creation in a network. The duplicate MAC addresses are blocked, and data is dropped if traffic is received on any interface other than the interface on which it is pinned.