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OSPF: Anatomy of an Internet Routing Protocol by John T. Moy

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Chapter 13. Unicast Routing Protocols

In this chapter, we compare and contrast the routing protocols in use in today’s Internet: RIP, OSPF, BGP, IGRP, and Integrated IS-IS. As we have seen, routing protocols can be categorized into IGPs and EGPs. (By the way, many TCP/IP routing protocols contain the word gateway. This was the original term for what we now call a router, a network-layer switching device. Today the word gateway is used for devices that switch at higher levels of the OSI reference model: mail gateways, application-level gateways, and so on.) Internet routing protocols can also be classified according to the basic routing technology they employ: Distance Vector or link-state (Table 13.1).

Table 13.1. Classification of TCP/IP Routing ...

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