Chapter 11. Troubleshooting Routing Protocols

Terms you'll need to understand:

• Static Route

• Dynamic Route

• Routing Information Protocol (RIP)

• Interior Gateway Routing Protocol (IGRP)

• Enhanced Interior Gateway Routing Protocol (EIGRP)

• Autonomous System (AS)

• Open Shortest Path First (OSPF)

• Border Gateway Protocol (BGP)

• Intermediate System-to-Intermediate System (IS-IS)

Techniques you'll need to master:

• Know the differences between static and dynamic routing

• Know the differences between distance-vector versus link-state routing protocols

• Know the different types of routing protocols

• How to use IOS commands to troubleshoot routing protocol problems

Routers need to be able to learn about attached networks and routes through the network. In smaller networks it is easy to use manually entered routes to let the router know where to route data it receives. Entering routes manually can be as simple as setting the network information on the inside and outside interfaces. Manually entered routes are called static routes .

Alternatively, routers can learn about networks and routes through the network from other network routers; in these situations, the learned routes are called dynamic routes . This chapter discusses the different dynamic routing protocols used in Cisco networks and explains how they work. This chapter also describes the commands related to troubleshooting routing protocols that you need to know to pass the exam successfully.