一个主机或组播路由器可以成为多个组的成员。
组播路由器每天可能接收到成千上万个组播分组。
A multicast router may receive thousands of multicast (71) every day for different groups.
该VLAN端口所连接的网络中至少含有一个主机组成员或者含有组播路由器。
In the network linked by VLAN ports, there is at least one group member or contains multicast Router.
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