Multicast routing protocol is the key of solving routing problem, which is the implement of multicast routing algorithm, and provide the mechanism of deliverying member informations and the method in deliverying datagram.

• 而组播路由协议体现了组播路由算法的实现，提供了传播成员信息的机制，以及转发数据报时使用该信息的方式，是解决组播路由问题的关键。