吸收协议——一个选播路由协议

Absorb Protocol — a Routing Protocol for Anycast

选播是一种很有用的通信模式.由于在复制服务器、移动IP等多个应用领域的需求,使越来越多的人关注怎样更好的实现选播.提出了一个选播路由协议—吸收协议.协议在提供最小端到端延迟路由前提下支持多路路由,以平衡网络流量,改善网络链路利用率.协议通过从选播成员开始的吸收过程,使网络中每个节点都有一条或者多条到选播地址的路由指向到该节点端到端延迟最小的选播成员.吸收协议原理简单,开销小,易于实现.不依赖其他路由协议,修改、升级不会影响其他路由协议.

Anycast is a new internetwork service, and a new feature of IPv6. With anycast service, a client can reach the most appropriate server, which is one of the servers that accept datagrams for the anycast address. How to supply a better anycasting has been focused on for anycasting can support many applications, such as replicas, mobile IP, host autoconfiguration. Therefore, a routing protocol for anycast called absorb protocol on IP-layer is proposed. Absorb protocol gets the minimum end-to-end delay routes by the delay information implied by the absorb request. The protocol supports multipath routing to distribute the traffic load and improve the link usage under the precondition of supplying an anycast routing with the minimum end-to-end delay. The protocol is simple and easy to implement. Its time cost and messages needed to form the route are all small. Its modification and upgrading don't affect other routing protocols for it is independent on other routing protocols.