CCNA Data Center DCICN 640-911 Official Cert Guide

OSPF Comparisons with EIGRP

Like all the IGPs discussed in this chapter, OSPF causes routers to learn routes, choose the best route to each subnet based on a metric, and to converge to choose new best routes when the network changes.

Although EIGRP uses DV logic, and OSPF uses LS logic, OSPF and EIGRP have three major activities that, from a general perspective, appear to be the same:

1. Both OSPF and EIGRP use a hello protocol to find neighboring routers, maintain a list of working neighbors, monitor ongoing hello messages to make sure the neighbor is still reachable, and to notice when the path to a neighbor has failed.

2. Both OSPF and EIGRP exchange topology data, which each router stores locally in a topology database. The topology database ...