Lab 43:
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.