Ｉｎｔｅｒｎｅｔ的发展和网络应用的普及对ＩＰ网络的性能提出了许多新的要求。由于Ｉｎｔｅｒｎｅｔ缺乏有效的流量和网络带宽管理手段,网络经常会发生拥塞,无法提供服务质量（ＱｏＳ）保证,使得很多应用如语音和视频等,对于目前的ＩＰ技术来说是力不从心。而新兴的多协议标 The development of Internet and the popularization of network application have put forward many new requirements on the performance of IP network. Due to the lack of effective traffic and network bandwidth management methods in the Internet, the network often experiences congestion and can not provide Quality of Service (QoS) guarantees. Many applications, such as voice and video, are powerless with current IP technologies. The emerging multi-protocol standard