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.
组播技术包括了组播组、组播地址、组播协议、组播可靠性和组播安全性等很多方面的内容。
Multicast technology includes a number of aspects, such as multicast group, multicast address, multicast protocols, multicast reliability, multicast security, etc.
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