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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).
Addresses between 0.0.0.0 and 223.255.255.255 are unicast. Addresses between 224.0.0.0 and 239.255.255.255 are multicast. Addresses from 240.0.0.0 and up are reserved. Anycasting is done with Unicast addresses in the routing tables of multiple addresses. It appears to be much easier to implement than multicast. Without looking at these routing tables, there is no way to differentiate an anycast address from a unicast address. This is inherent in the design. Anycasting relies strictly on the the routing tables and does not require special address ranges as multicasting does.