A host or multicast router can have membership in a group.
一个主机或组播路由器可以成为多个组的成员。
The client sends an IGMP join message to its designated multicast router.
客户端会传送IGMP加入群组讯息到指定的群播路由器。
A multicast router may receive thousands of multicast (71) every day for different groups.
组播路由器每天可能接收到成千上万个组播分组。
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