基于IP的Internet取得了巨大的成功,也面临着新的挑战。IP和ATM结合技术是解决Internet存在问题的方法之一,文中讨论了三种IP技术的特点,分析了实现IP交换的几项关键技术,并给出了解决方案。在此基础上,构造了一个用来分析IP交换性能的IP交换流分类器的系统模型,最后介绍了开放式、事件驱动的网络仿真平台NS(NetworkSimulator),并利用NS来实现文中提出的自适应流分类器AFC的结构。 IP-based Internet has achieved great success, but also faces new challenges. The combination of IP and ATM technology is one of the ways to solve the existing problems in the Internet. The paper discusses the characteristics of the three IP technologies, analyzes several key technologies for IP exchange, and presents solutions. On this basis, a system model of IP exchange flow classifier for analyzing IP switching performance is constructed. Finally, an open and event-driven network simulation platform NS (Network Simulator) is introduced and the NS Adapt to the structure of stream classifier AFC.