The text expands on the underlying technologies in EIGRP,
including the path selection process.
Chapter Objectives
Upon completing this chapter, you will be able to con?¬?gure, verify, and troubleshoot EIGRP.
This ability includes being able to meet these objectives:
?– Describe the operation and con?¬?guration of EIGRP, including load balancing and
authentication
?– Identify an approach for troubleshooting common EIGRP problems and offer solutions
Implementing EIGRP
EIGRP is an advanced distance vector routing protocol developed by Cisco. EIGRP is suited for
many different topologies and media. In a well-designed network, EIGRP scales well and
provides extremely quick convergence times with minimal overhead. EIGRP is a popular choice
for a routing protocol on Cisco devices.
Introducing EIGRP
EIGRP is a Cisco-proprietary routing protocol that combines the advantages of link-state and
distance vector routing protocols. EIGRP is an advanced distance vector or hybrid routing
protocol that includes the following features:
?– Rapid convergence: EIGRP uses the Diffusing Update Algorithm (DUAL) to achieve
rapid convergence. A router that uses EIGRP stores all available backup routes for
destinations so that it can quickly adapt to alternate routes.
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