Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide

EIGRP Concepts and Operation

EIGRP Fundamentals

EIGRP differs from OSPF in some pretty obvious ways, but in some ways EIGRP acts a lot like OSPF. In fact, EIGRP uses a three-step model similar to OSPF when a router first joins a network. These steps each lead to a list or table: the neighbor table, the topology table, and the routing table. All these processes and tables lead toward building the IPv4 routes in the routing table, as follows:

1. Neighbor discovery: EIGRP routers send Hello messages to discover potential neighboring EIGRP routers and perform basic parameter checks to determine which routers should become neighbors. Neighbors that ...