This link is to the collectiveidea fork of the project, which seems to be the currently maintained stream.
这个是项目的 collectiveidea 分支的链接，它是当前维护的分支。
IP multicast utilizes a tree delivery structure, on which data packets are duplicated only at fork nodes and are forwarded only once over each link.
IP组播利用树转发结构，只需在组播树的分支处复制数据报文，而且在每条链路上仅转发一次。
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