一组端口，组播组都是组播报文或者数据帧（必须发送到组播组中的所有端口）发送的目标地址。
支持256个组播组。
每个控制组播组包含的基站数量根据网络结构和主机的移动速度来调整。
The number of base stations in multicast group for control was adjusted according to structure of the mobile network and the moving velocity of mobile hosts.
随着网络规模的增大，组播组多对多的通信，都对可靠组播提出了新的需求和挑战。
With the increasements of the network and communication of many-to-many, it puts new demands and challenges for reliable multicast.
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