http://www.rfc-editor.org/rfc/rfc7117.txt
RFC 7117: Multicast in Virtual Private LAN Service (VPLS), R. Aggarwal, Y. Kamite, L. Fang, Y. Rekhter, C. Kodeboniya2014-02-01T23:00:00-00:00This document describes solutions for overcoming a subset of the limitations of the existing VPLS multicast solution. It describes procedures for VPLS multicast that utilize multicast trees in the service provider (SP) network. The solution described in this document allows sharing of one such multicast tree among multiple VPLS instances. Furthermore, the solution described in this document allows a single multicast tree in the SP network to carry traffic belonging only to a specified set of one or more IP multicast streams from one or more VPLS instances.