Multicast is a communication approach on one source node sending the same message to multiple destination nodes. IP multicast technology decreases link bandwidth overhead,network resource consumption and source host burden.

• 组播是一个源节点将同一信息传送到多个目的节点的通信方式,IP组播技术减少了网络不必要的带宽开销、网络资源的消耗以及大大减轻了源主机的负担。