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Abstract The ever-increasing growth of the Internet and corporate Intranets are presenting a serious challenge to service providers and equipment vendors This paradigm shift has transformed the way the world does business and defines new requirements for any business that wants to gain a competitive edge Service providers especially are faced with the challenge of creating differentiated IP services and getting these new value-added services to market quickly Cisco s Tag Switching technology is a key component in Cisco s plans for meeting these challenges The two main components of Tag Switching are forwarding and control This Tag Switching technology can retain the scaling properties of IP and can help improve the scalability of IP networks Tag Switching marries the performance of Layer 2 switching with the intelligence of Layer 3 routing to meet future growth demands 4 Introduction The continuous expansion of the Internet demands higher bandwidth within the Infrastructures of all corporations not just Internet Service Providers ISPs Nevertheless growth of the Internet is not the only driving factor for higher bandwidth demand for higher bandwidth also comes from emerging multimedia applications This demand for higher bandwidth requires higher throughput performance packets per second by routers for both unicast and multicast traffic The expansion of the Internet also demands improved scaling properties of the Internet routing system The ability to contain the magnitude of routing information maintained by individual routers and the ability to build a hierarchy of routing knowledge are essential to support a quality scalable routing systems 2 The requirements are growing for the need to X Improve scalability X Improve forwarding performance X Add routing functionality to support multicasting X Allow for more flexible control over routing the traffic X Provide the ability to build a hierarchy of routing knowledge 1 Cisco s multilayer switching technology known as Tag Switching provides an effective solution for
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