EIGRP troubleshooting and configuration in packet tracer

How to configure EIGRP in packet tracer in easy steps and EIGRP troubleshooting

Configuring the EIGRP protocol is fairly easy, we just have to enter a couple of commands to enable EIGRP protocol on Cisco routers however in big networks, configuring is not always easy as we have to configure more routers based on network requirements.

In this lab, we will configure a basic network with the EIGRP protocol using 3 routers.


After configuring the routing, we should successfully see the routes learned with this dynamic routing protocol.

Below is the output of the show ip route command, we can see that only directly connected networks are showing up in the routing table. Now, we will configure EIGRP routing on all three routers.

Before configuring the routing, we have to make sure that IP connectivity is properly established between the devices otherwise, routers will not learn the routes.

We will use the following two commands to configure basic EIGRP routing.

Router Eigrp 1 – 1 is the autonomous number which should be the same for all the routers.

Network (Network ID) – Advertising the directly connected networks

Below are the commands used to configure router 1

Router(config)#router eigrp 1



We can also use wildcard bits while using the network command, we can use wildcards to advertise complex subnetted networks. The above configuration was possible with only one network command using the wildcard.

In the same way, we will configure other routers as well.

We can see in the below image, that as soon as we used the network command, adjacency formed between router 1 and router 0.

After configuring the EIGRP protocol on all routers, we can see the EIGRP routes in the routing table so EIGRP is now working as required within the network.

Remove the advertised network

To remove the advertised network, we can use the following command

Router(config-router)#no network

Disable EIGRP

To disable EIGRP, we can use the following command.

No router EIGRP (process-id)

EIGRP troubleshooting

Even after the proper configuration, you can try the following steps to troubleshoot the routing issues.

  • Check if the neighbor router is on the same subnet otherwise neighbor relationship will not form.
  • Check if you have advertised the correct network.
  • Check if the autonomous number is the same and correct the configuration if you find any discrepancy.
  • Check if you have advertised all networks that are connected to the router.

Still, if you are not able to troubleshoot EIGRP then you can use debug commands to dig deep and find out the issue.

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