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Multicast Routing Protocol. A multicast routing protocol is one type of service provider that functions as a client within the framework of the router architecture. The routing architecture is designed to be extended by such router client modules. multicast routing protocol manages group membership and controls the path that multicast data takes over the network. Examples of multicast routing protocols include: Protocol Independent Multicast (PIM), Multicast Open Shortest Path First (MOSPF), and Distance Vector Multicast Routing Protocol (DVMRP).
Using multicast, a source can send a single copy of data to a single multicast address, which is then distributed to an entire group of recipients. A multicast group identifies a set of recipients that are interested in a particular data stream, and is represented by an IP address from a well-defined range.ata sent to this IP address is forwarded to all members of the multicast group. Routers between the source and recipients duplicate data packets and forward multiple copies wherever the path to recipients diverges.