EIGRP Enabler #1

At some point, you need to master the network commands used with routing protocol configuration. This exercise gives you some practice on that one specific point, specific to EIGRP configuration. Your job: read and react to a set of requirements to then choose how to configure about a dozen EIGRP network commands – an important skill for the CCNA exam!

Initial State: Topology

Each EIGRP (and OSPF) Enabler exercise starts with an almost complete configuration matching a design shown in a figure. Figure 1 shows the figure for this exercise, which shows one central-site router (R1) and three remote routers.

EIGRP Enabler Topology

Initial State: Interfaces and Routing Protocol

Each of the routers has an initial configuration that includes IPv4 addresses, working interfaces, and EIGRP configured to shows its autonomous system number. Examples 1, 2, 3, and 4 show that configuration. (Note that you will reference this configuration when picking your answers.)

Router R1 Initial Configuration

Router R2 Initial Configuration

Router R3 Initial Configuration

Router R4 Initial Configuration

Your Job: Complete the Configuration with network Commands

To finish the configuration, you need to enable EIGRP on all the interfaces shown in the figure. To do that, for this lab, add EIGRP network commands to each router’s configuration.

By the end of this exercise, a real network with the combined initial config, plus your config, should result in:

• EIGRP neighbor relationships between the central site router (R1) and each of the three remote routers. That is, R1 will have three neighbors, while R2, R3, and R4 will have one neighbor (R1).
• Each router has learned routes to all subnets in the figure.

Configure Your Commands Per These Specific Rules

This section gives you specific requirements for this exercise just so that there is only one correct answer to the exercise. I chose the following rules just to give you a variety of practice. In your network commands, use wildcard mask parameters as follows:

R1 – Match the Network: On router R1, make each network command match all addresses in a single classful network (that is, in a single class A, B, or C network.) Use wildcard masks as needed, and use as many network commands as needed to enable EIGRP on all interfaces shown in the figure.

R2 –  Match the Subnet: On router R2, make each network command match all addresses in a single subnet. Use wildcard masks as needed, and use as many network commands as needed to enable EIGRP on all interfaces shown in the figure.

R3 –  Match the Interface Address: On router R3, make each network command match one specific IP address. Use wildcard masks as needed, and use as many network commands as needed to enable EIGRP on all interfaces shown in the figure.

R4 –  Match the Subnet: Same rules as for R2.

Note that this exercise is not like what real network engineers do in their jobs. For this exercise, I gave you different rules for the configuration of each router, so that you could exercise and learn different options. In real networks, you would probably use the same approach on each router.

Answers!

I will post an answer post in a few days. So, look for the link at the bottom of this page.