EIGRP for IP: Basic Operation and Configuration

4 EIGRP Troubleshooting

We’ve looked at how EIGRP works, configuring and running EIGRP, and EIGRP network design. With all of this theory in the background, let’s look at some common problems you might see in an EIGRP network and consider how to troubleshoot them. In this chapter, we’ll look at

• Problems with neighbor relationships

• Stuck in Active routes

• Duplicate router IDs

• Failure to converge

We’ll start by looking at various problems you might encounter with building and maintaining neighbor relationships.

Problems with Neighbor Relationships

You may recall from Chapter 1 that EIGRP uses neighbor relationships to control the exchange of routing information and to ensure the validity of routes received from a given neighbor. These ...