Translation of PIM join/prune messages to IGMP or MLD report/leave messages

To enable the use of IGMP or MLD to forward multicast traffic across the PIM domains in such topologies, one can configure the rendezvous point (RP) router that resides between the edge domain and core domain to translate PIM join/prune messages received from PIM neighbors on downstream interfaces into corresponding IGMP or MLD report/leave messages. The router then transmits the report/leave messages by proxying them to one or two upstream interfaces that can be configured on the RP router.