BIRD 介绍
BIRD是一个类UNIX系统的动态路由守护进程。它支持当代互联网中所用所有路由协议，如BGP、OSPF、RIP和这些协议的IPv6的变种（除OSPFv3目前尚在发展）
。此外，它还采用了非常灵活的配置机制，以及一个路由过滤语言。
BIRD is a dynamic routing daemon for UNIX-like systems. It should support all
routing protocols used in the contemporary Internet, such as BGP, OSPF, RIP,
and their IPv6 variants (except for OSPFv3 which is still under development).
It also features a very flexible configuration mechanism, and a route
filtering language.