E-TREE Support in EVPN & PBB-EVPN

The Metro Ethernet Forum (MEF) has defined a rooted-multipoint Ethernet service known as Ethernet Tree (E-Tree). A solution framework for supporting this service in MPLS networks is proposed in and RFC called "A Framework for E-Tree Service over MPLS Network". This document discusses how those functional requirements can be easily met with (PBB-)EVPN and how (PBB-)EVPN offers a more efficient implementation of these functions. This document makes use of the most significant bit of the scope governed by the IANA registry created by RFC7385, and hence updates that RFC accordingly.