与IP组播相比，覆盖组播通常会消耗更多的底层网络资源。
Compared with IP multicast, overlay multicast usually consumes more underlying network resources.
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.
提出了覆盖网络组播的链路压力均衡模型和组播树特征伸长度模型，用以评价覆盖网络组播协议的性能。
It is presented the stress equilibrium model and the stretch eigen-value model for evaluating the performance of overlay network multicast protocols.
DSALM的优点主要包括：1易于实现：不需要构建和维护复杂的结构化覆盖网络，也不需要部署特殊的组播通讯协议。
The features of DSALM mainly includes: (1) Easy to implement, it doesn't have to construct and maintain a complex multicast tree, and also doesn't have to deploy multicast communication protocol.
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.
本文着重研究在P2P覆盖网络上构建应用层组播系统。
This paper focuses on the study of building application-layer multicast system over P2P overlay.
因此，研究组播覆盖网络技术有较高理论与现实意义。
So there is important significance in research on Multicast Overlay Network technology in the theory and the practice.
组播覆盖网络技术可以在非完全组播网络中实现组播业务，并具有较高数据传输效率。
Multicast Overlay Network technology is able to carry out multicast session in Partial-multicast Network, and can transport data with high efficiency.
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.
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.
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