Multicast in Virtual Private LAN Service (VPLS)
2014
RFCs 4761 and 4762 describe a solution for Virtual Private LAN Service
(VPLS) multicast that relies on the use of point-to-point or
multipoint-to-point unicast Label Switched Paths (LSPs) for carrying
multicast traffic. This solution has certain limitations for certain
VPLS multicast traffic profiles. For example, it may result in highly
non-optimal bandwidth utilization when a large amount of multicast
traffic is to be transported. This 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.
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