Welcome back to the 11th part of our CCNA prep video series. In this installment, we will begin configuring EIGRP. EIGRP is an advanced distance vector routing protocol and is the first of the two routing protocols we will be considering in this video series, the second being OSPF. We will also look at basic verification commands for our EIGRP configuration.

Further reading

Video Transcript:

Welcome back to the CCNA Routing and Switching Prep video series. We are currently looking at IP routing.

In this video, we will configure the Enhanced Interior Gateway Routing Protocol (EIGRP). Since this video series focuses on configuration objectives, as much as possible, I will keep our discussion at a high level. There are many articles online that give theoretical depth to these topics and you can refer to them later.

Let’s modify our current topology a bit. I’d add a direct connection between the office router and branch router. I will also configure a loopback interface on the branch router. This will serve as the LAN of that branch network.

For our example, we will assume all the routers are under the same administrative control i.e. Autonomous system. For EIGRP, all devices in the same AS must use the same AS number.

router eigrp

As with most other routing protocols, we use the “network” command to specify what interfaces we want to be part of our EIGRP network.

Instead of listing the interface network addresses one after the other, you can just use 0.0.0.0 0.0.0.0 if you want all the router interfaces to be part of the EIGRP network. EIGRP has very fast convergence time so as soon as we have configured the network statements, you see the neighbor relationships come up.

Let’s configure the last router.

There are a couple of commands that are useful to verify our EIGRP configuration. First we can check the routing table. I will like to point out the fact that by default, EIGRP summarizes routes at the classful network boundaries. That’s why this 10.10.12.0/24 network is showing as /8. We can change it on all our routers using the “no auto-summary” command (no auto for short) under the EIGRP routing process. Keep in mind that this restarts your neighbor relationships.

Another useful command is the “show ip protocol” command.

We also have EIGRP specific commands such as “show ip eigrp neighbor” and “show ip eigrp topology”.

We will stop here for now but in the next video, we will talk more about EIGRP concepts including feasible distance, metric composition, and router ID.