1 引言 Internet的快速发展对网络带宽的要求越来越高,由于光纤技术的进步,尤其是DWDM技术在骨干网络上的应用,光纤能够承载的容量也越来越大。然而,根据摩尔定律,计算能力的增加是每18个月增加一倍,因此,传统的路由器就逐渐成为网络的瓶颈。而且,多媒体以及实时通信技术对服务质量也提出了严格的要求,这又增加了路由器的开销。总之,对下 1 Introduction The rapid development of the Internet requires more and more network bandwidth. Due to the advances in optical fiber technology, especially the application of DWDM technology in backbone networks, the capacity of optical fibers can be carried more and more. However, according to Moore’s Law, computing power has doubled every 18 months, so traditional routers have gradually become the bottleneck of the network. Moreover, multimedia and real-time communication technologies also impose stringent requirements on service quality, which in turn adds to the overhead of the router. In short, the next