In current widely used protocol independent multicast-sparse mode,RP(Rendezvous Point)is the root of the shared tree,datagram is sent from source to RP and forwarded along the shared tree.

• 在协议无关组播稀松模型中,作为共享树的根,数据包都从源点直接发送到,再由沿共享树-(PIM-SM)RP(Rendezvous Point)RPRP发送到各接收点。