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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).
Any Source Multicast (ASM), in which a receiver joins a multicast group, and receives traffic from any senders that send to that group. Source-Specific Multicast (SSM), in which a receiver explicitly joins to a (source, group) pairing. Multicast Addressing. For IPv4, multicast addresses are in the range 224.0.0.0 to 239.255.255.255 inclusive. 1  Addresses within 232.0.0.0/8 are reserved for SSM usage. Addresses in 239.0.0.0/8 are ASM addresses defined for varying sizes of limited scope. Addresses within 224.0.0.0/24 are considered link-local and are forwarded between subnets.