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。

youdao

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。

youdao