EIGRP Automatic Summarization

EIGRP Automatic Summarization

Lab Objective:

The objective of this lab exercise is for you to learn and understand how EIGRP performs automatic summarization at Classful network boundaries.

Lab Purpose:

Dealing with EIGRP automatic summarization is a fundamental skill. EIGRP is an advanced Distance Vector routing protocol. It is also a Cisco proprietary protocol that runs over IP protocol number 88. Because of the VLSM employed in the networks of today, automatic summarization is a default feature that should not be used. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to enable basic EIGRP routing.

Certification Level:

This lab is suitable for CCENT & CCNA certification exam preparation

Lab Difficulty:

This lab has a difficulty rating of 5/10

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 15 minutes

Lab Topology:

Please use the following topology to complete this lab exercise:

Task 1:

Configure the hostnames on routers R1 and R3, as illustrated in the topology. Since R1 S0/0 is the DCE end of the back-to-back Serial connection, configure R1 to send R3 clocking information at a rate of 256Kbps. Configure the IP addresses for R1 and R3 S0/0 interfaces as specified in the topology and ping between the routers to verify connectivity based on your configuration.

Task 2:

Configure the Loopback interfaces on R3 as illustrated in the topology.

Task 3:

Enable EIGRP using Autonomous System 172 on both R1 and R3 and configure EIGRP network statements for R1 and R3 S0/0 interfaces and for the Loopback interfaces on R3.

Task 4:

On R1, verify the EIGRP routes you are receiving from R3. You should notice that you only have one route, which is 10.0.0.0/8 for the three Loopback interfaces configured on R3.

Task 5:

Configure R3 so that it does not perform automatic summarization at Classful boundaries and clear the IP routing table on R3 and R1 using the clear ip route * command.

Task 6:

On R1, verify the EIGRP routes you are receiving from R3. You should now have three routes for the 10.x.x.x/24 Loopback interfaces configured on R3 and advertised by EIGRP. Ping these IP addresses to verify connectivity.