It is important to understand dynamic routing and how the various types of routing protocols,
such as distance vector and link-state, determine IP routes. It is equally important to understand
scalability and convergence constraints with routing protocols.
Classless routing protocols, such as Routing Information Protocol version 2 (RIPv2), Enhanced
Interior Gateway Routing Protocol (EIGRP), and Open Shortest Path First (OSPF) scale better
than classful routing protocols because they support variable-length subnet masks (VLSM) and
route summarization.
To effectively manage an IP network, you must understand the operation of dynamic routing
protocols and the impact that they have on an IP network. This chapter describes the operation
and limitations of distance vector and link-state routing protocols.
Chapter Objectives
Upon completing this chapter, you will be able to describe the application and limitations of
dynamic routing for a medium-sized routed network. This ability includes being able to meet
these objectives:
?– Describe the purpose and types of dynamic routing protocols
?– Describe the operation and implementation of distance vector routing protocols
?– Describe the operation and implementation of link-state routing protocols
98 Chapter 3: Medium-Sized Routed Network Construction
Reviewing Dynamic Routing
Routers can forward packets over static routes or dynamic routes, based on the router
con?¬?guration.
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