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本文介绍了Ｉｎｔｅｒｎｅｔ核心网中的各种多层交换技术。在此基础上，指出ＭＰＬＳ是对ＩＰ网中的路由和转发体系结构的革新，是目前ＩＰ网络组网模式的发展趋势。最后介绍了ＭＰＬＳ在流量工程、ＣＯＳ、虚拟专用网等方面的应用与优势。
This article describes the various layers of the Internet core network switching technology. On this basis, it is pointed out that MPLS is an innovation of the routing and forwarding architecture in the IP network and is the trend of the present IP network networking mode. Finally, the application and advantages of MPLS in traffic engineering, COS, virtual private network and so on are introduced.