Multicasting is a function of the IP network protocol, with the help of special multicast routers and protocol stacks.
多点传送是IP网络协议的一项功能，它在专用多点广播路由器和协议堆栈的辅助下工作。
In the Mobile Ad hoc network (MANET), the efficiency multicast route is one of hot-study for the network multicast routers.
高效的组播路由是移动自组网网络组播路由的研究热点之一。
Multicast routers send group Membership Query messages to learn which groups have members on each of their attached physical networks.
多路广播路由器会发送“组成员查询”消息，以了解哪些组在每个所连接到的物理网络上都有成员。
Considered the performance, this specific member should be distributed in different sub-groups, which can help deal with the communications quickly, and reduce the burden on the multicast routers.
并且出于性能的考虑，将这个特定的成员分布在不同的子组里，这样可以快速处理通讯，从而减轻了组播路由器的负担。
In traditional IP multicast, data for a given group is forwarded through a tree structure covering the members of this group. The on-tree routers must maintain a per-group forwarding state.
在传统组播中，组播组数据由一棵覆盖所有组成员的组播树进行转发，树上路由器必须保存每一个组播组的转发状态。
With multicast tree aggregation, fewer trees are maintained which amounts to reduce both the number of forwarding states in routers and the overhead induced by control messages.
组播组的聚合使得网络中组播树的数量减少，路由器需要维持的组播转发状态和传递控制信息带来的控制开销都大大降低。
With multicast tree aggregation, fewer trees are maintained which amounts to reduce both the number of forwarding states in routers and the overhead induced by control messages.
组播组的聚合使得网络中组播树的数量减少，路由器需要维持的组播转发状态和传递控制信息带来的控制开销都大大降低。
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