RSVP messages are sent as IP datagrams, and the router keeps "soft state", which is refreshed by periodic reservation messages.
RSVP消息以IP数据报文的形式发送，路由器保留“软状态”，由周期性保留消息进行刷新。
This paper introduces the standard and requirement for the transmission of IP datagrams over Ethernet, X. 25, Point-to-Point Links in a router.
本文简要介绍了路由器中IP数据包在以太网、X25分组交换网、串行链路上用相应的协议帧格式对IP数据包进行封装的标准和要求。
Before a host computer can send IP datagrams beyond its directly attached subnet, it must discover the address of at least one router on that subnet.
在主机可以向其直接连接的子网外发送IP数据报之前，主机必须至少在该子网上发现一个路由器的地址。
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