Chapter 4

Enhanced IGRP (EIGRP) and Open Shortest Path First (OSPF)

Enhanced Interior Gateway Routing Protocol (EIGRP) is a proprietary Cisco protocol that runs on Cisco routers. It is important for you to understand EIGRP because it is probably one of the two most popular routing protocols in use today. In this chapter, I’ll show you the many features of EIGRP and describe how it works, with particular focus on the unique way it discovers, selects, and advertises routes.

I’ll also introduce you to the Open Shortest Path First (OSPF) routing protocol, which is the other popular routing protocol in use today. I’ll explain commands to use in order to implement single-area OSPF in specific networking environments and demonstrate how to verify that ...

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