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.
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。
Compared with IP multicast, overlay multicast usually consumes more underlying network resources.
与IP组播相比，覆盖组播通常会消耗更多的底层网络资源。
Overlay networks will integrate multicast capabilities of the IP and optical network.
层叠网络的进一步演进，将进一步融合ip组播和光网络组播。
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