May 2009
Intermediate to advanced
882 pages
22h 55m
English
Content preview from Cisco® Network Professional's: Advanced Internetworking Guide
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6.1. Introduction to Link State Protocols
Open shortest path first (OSPF) is extremely versatile. It is one of the most widely used open standard IP routing protocols today. Open standard means that any vendor can use the protocol, and most vendors do provide some level of support for open standard protocols. Both enterprise and service provider networks use, and benefit from, OSPF.
IS-IS is the other link state protocol; it is an OSI standard protocol. IS-IS is widely used in service provider networks. I discuss IS-IS later in this chapter.
I describe link state routing protocols and discuss the primary characteristics of the OSPF routing protocol, including the OSPF hierarchical structure, link state adjacencies, shortest path first (SPF) ...
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