Anycast通信机制及其研究现状

Anycast是一种新的标准通信模式,用户通过一个Anycast地址就可以访问该地址所表示的一组服务器中离用户最近的一台服务器。Anycast在镜像服务器选择、移动Adhoc网络,以及支持主机自动配置方面有着广泛的应用前景。针对Anycast服务所进行的工作可分为两类:第一,在应用层(Application Layer)上通过管理手段实现Anycast的相关服务;第二,在网络层(Network Layer)上采用路由选择算法完成Anycast的路由和选址。关于Anycast的一些协议和标准正在讨论之中,不确定性传输、组管理和Anycast路由表规模压缩等问题是当前研究的热点。

Anycast Communication Status and Its Research Status

Anycast is a new standard communication paradigm.With anycast,client can request the "nearest" server in terms of a certain performance index for provision of a group services which share one anycast address.Anycast has a wide application prospect in the selection of mirror services,mobile Adhoc network and support of host automatic configuration.Research efforts about anycasting can be made in two aspects: management methods at application layer for using anycast services,and procedures and protocols at network layer for routing and addressing anycast messages.Protocols and standards of anycast are being discussed.The problems pertaining to anycast such as indeterminacy of transmission,management of anycast group and compression of router table are hot research spots at present.