Verifying the Eigrp Operation

The set of commands in this section is invaluable. These commands are crucial in the configuration, maintenance, and troubleshooting of a live network. As such, they are a necessary set of tools for use on a daily basis as well as on the CCIE lab exam.

For the preparation of the routing exam, understanding the output of these commands is important, not just because they may constitute questions on the exam, but because they reflect your conceptual understanding of the subject. The ability to analyze what is happening on the network demands a thorough understanding of the concepts explained in this chapter. This skill is required in interpreting the output of a show command.

This section deals with the following commands:

• show ip eigrp neighbors—Gives detailed information on the neighbors. This command records the communication between the router and the neighbors as well as the interface and address by which they communicate.

• show ip eigrp topology—Gives details about the routes held in the topology table and for detailed information on the networks that the router is aware of and the preferred paths to those networks, as well as the next logical hop as the first step in the path. The router will track the EIGRP packets that have been sent to neighbors in this table.

• show ip eigrp topology all—Gives details about all the routes and alternative paths held in the topology table. The router will track the EIGRP packets that have been sent to neighbors in this table.

• show ip eigrp traffic—Gives information on the aggregate traffic sent to and from the EIGRP process.

• show ipx route—Shows the routing table for IPX and is the source of the information on how to reach the remote destination network.

The EIGRP show commands are highly detailed and give a comprehensive understanding of the state of the network. The other commands generic to IP—show IP route and show IP protocols, as described in Chapter 5, "Using OSPF in a Single Area,"—are also useful in the maintenance of EIGRP.

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