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.
其核心思想是不超过带宽浪费门限的情况下最小化聚合树的数量，使之覆盖所有组播组。
The core idea of Aggregated multicast is to minimize the number of multicast trees without violating a given bandwidth waste threshold, enabling these trees to cover all the groups.
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.
MVPN是以新的IP隧道技术为基础构建起来的，该技术将组播组地址用作隧道目的地址。
MVPN is built upon a new IP tunneling technology that USES multicast group addresses as tunnel destination addresses.
由ucla网络实验室提出的聚合组播使域内的多个组播组共用同一棵聚合树来转发组播数据包。
Aggregated Multicast is a recent approach proposed by the UCLA network laboratory. In this approach, multiple groups share the same aggregated tree within a domain.
该方法通知系统内核使用IP_ADD_MEMBERSHIP套接字选项将套接字加入一个组播组。
Tells the kernel to join a multicast group with IP_ADD_MEMBERSHIP socket option.
当大量组播组并存于网络时，数量庞大的转发状态表占用了大量内存资源并且减缓了组播地址查询过程。
When there are large Numbers of multicast groups in the network, large forwarding tables induce large memory requirements and slow down the address look-up process.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
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。
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.
通过配置组播CAC的政策，它可以控制不同IGMP Snooping组播组的数量和带宽在接口层面和全球层面。
By configuring the multicast CAC policies, it can control the quantity and bandwidth of different IGMP snooping multicast groups at interface level and global level.
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.
按照变迁-存根拓扑模型创建网络拓扑，网络节点1200个，代理覆盖中设置16个代理，组播组中最多1024个客户端。
The network topology is created following the Transit-Stub model, consisting of nearly 1200 network nodes, with 16 proxies in the proxy overlay and up to 1024 clients in the multicast groups.
因此，组播的应用类型已经成为了决定安全组播应用的一个重要因素，如在远程教育中应重点考虑组播组扩展后的安全问题；
So the type of multicast application has become a important factor. For example, the security question of multicast member's expanding should be thought in distance education;
事实上，子网的组播路由器在处理完主机的加入组播组信息之后并没有保存主机的身份信息，也没有将它传输到上游的组播分发树。
In fact, the subnet multicast router does not maintain host's identity after processing its membership request and does not transmit such an identity upstream in the delivery tree.
已经预订某一多播组的对等计算机会收到任何成员发送给这个组的所有消息。
Peer computers that have subscribed to a multicast group receive all messages that any of the component peers sends to the group.
希望加入这个多播组的对等计算机必须显式地预订这个组。
Peer computers interested in being a part of this multicast group must explicitly subscribe to the group.
组播技术的核心是选路问题，设计或选取合适的组播路由算法对组播选路的有效实施非常重要。
The core of multicast mechanism is routing problem, and designing & selecting appropriate multicast routing algorithm is very important to efficiently implement multicast routing.
传统的组播密钥管理都假设所有合法组用户可以知道组密钥，这种假设对于商业组播是不现实的。
It is impractical for commercial multicast assuming that all group members know the group key in traditional multicast key management schemes.
DMA在远程加入的基础上，使用动态选择组播代理和局部隧道的方法，为移动网络内的节点提供组播服务。
Based on Remote Subscription, DMA services the nodes inside the mobile network by using dynamic multicast agent selection and local tunnel.
MA主要由移动组的组成员管理协议和移动组的全序可靠多播协议组成。
MGC-MA mainly consists of a mobile group membership management protocol and a mobile group totally ordered reliable multicast protocol.
目前由于MPLSVPN网络中很多PE设备尚不支持组播业务，因此在VPN内部署组播业务时遇到了一定的困难。
Now, many PE devices in MPLS VPN network do not support multicast service, as result, it brings difficulty in multicast service.
组播通信有效地节约了网络资源，在无线移动网络环境中引入组播有着非常重要的意义。
Multicast conserves the network resources efficiently, it is significant to provide multicast mechanism in wireless mobile environment.
本文主要探讨在以太网交换机上的一种组播协议：组播侦听协议。
In this paper, the multicast protocol (IGMP Snooping) on Ethernet switch is discussed.
组播安全问题包括：数据保密、组管理和访问控制、源认证等多个方面。
The issue of multicast security consists of data confidentiality, group management, data source authentication and so on.
未来，可以通过降低光网络组播树的粒度来降低光组播的使用门槛，这将有利于促进组播技术的更广泛使用。
In the future, multicast technologies can be promoted through lowering the threshold for multicast applications, that is, decreasing the granularity for an optical network multicast tree.
相比于传统MRA算法，该算法生成的组播树中源点到组播成员节点的平均延时大约为前者的90%。
The average delay from the source to all destinations in the tree generated by the algorithm is about 90% of the traditional MRA algorithm.
组播算法就是要建立一棵从源节点到目的节点的组播树，并给这棵组播树分配波长。
Multicast algorithm is to build a multicast tree from the source node to destination nodes, and to assign wavelength.
移动组播是移动互联网络技术的一个研究热点，但现有移动组播方案存在着组播中断时间长、协议开销大等问题。
Mobile multicast is a research hotspot of mobile network, but most of mobile multicast schemes suffer from the long multicast disruption time and heavy protocol cost.
移动组播是移动互联网络技术的一个研究热点，但现有移动组播方案存在着组播中断时间长、协议开销大等问题。
Mobile multicast is a research hotspot of mobile network, but most of mobile multicast schemes suffer from the long multicast disruption time and heavy protocol cost.
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