Chapter 2. Link State Basics
All current IP routing protocols belong to one of two classes: vector protocols or link state protocols. RIP, RIPv2, RIPng, Cisco Systems’ IGRP and EIGRP, and BGP are vector protocols, whereas OSPF and IS-IS are link state. This chapter presents the fundamental concepts of link state protocols. With these concepts firmly understood, the remaining chapters can then demonstrate how OSPF and IS-IS implement each concept similarly or differently.
The objective of a routing protocol is to create, in each router in a network, a database of reachable destination addresses for the purpose of forwarding packets. Each address in the database is associated with the router interface closest to the destination and possibly the ...
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