Vocabulary - Key Terms:

EIGRP: is an advance distance vector routing protocol, but also acts as a link-state protocol in the way that it updates neighbors and maintains routing information.
The Interior Gateway Routing Protocol (IGRP): is a routing protocol that was developed in the mid-1980s by Cisco Systems, Inc. Cisco's principal goal in creating IGRP was to provide a robust protocol for routing within an autonomous system (AS).



Related Articles:

EIGRP - From Wikipedia

EIGRP Routing: Book exerpt from O'Reilly

EIGRP Basics: From the Cisco web site



Key Concepts:

How Does EIGRP Work?

EIGRP has four basic components:

• Neighbor Discovery/Recovery
• Reliable Transport Protocol
• DUAL Finite State Machine
• Protocol Dependent Modules

There are three tables that EIGRP maintains:

- Neighbor Table: Lists adjacent routers. This table is comparable to the adjacency database used by OSPF. There is a neighbor table for each protocol that EIGRP supports.

- Topology Table: Made up of all the EIGRP routing tables in the autonomous system.

- Routing Table:is an electronic table (file) or database type object that is stored in a router or a networked computer.

EIGRP Succesors and Feasible Successor



Course Materials:

CCNA 3 - Module 3 - Study Guide (.pdf)