用户端在 网络上一堆结点中协商选择一条路由，这里面每个结点都知道它的前承和后继结点，但不知道其它的结点的存在。
Users choose a source-routed path through a set of nodes, and negotiate a "virtual circuit" through the network, in which each node knows its predecessor and successor, but no others.
该RSVP系统包括两个部分：用户端和中间路由器。
The RSVP system consists of two parts: the user hosts and the routers.
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