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In order to verify that summarization is configured correctly, you must look at the IP routing table. Router R3 was configured for summarization and the routing table on router R3 is presented in the figure above. Router R3 has both 172.16.1.0 and 172.16.2.0, the discontiguous subnets, in its routing table. Because of the summarization, only network 172.16.0.0 is

advertised out of the serial0/0/0 interface, though.

The summary route pointing to the Null0 interface prevents routing loops. This approach is based on the assumption that the router doing summarization has more information on the subnets covered by the summary route besides the summary route itself.

Summary

This topic summarizes the key points that were discussed in this lesson.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. RO UTE v 1.0—2-21

Summary

EIGRP operation can be verified by examining the EIGRP neighbor relationship information and IP routing table for the presence of EIGRP routes.

The neighbor command can be used to form the EIGRP neighbor relationship with only specific neighbors using unicast packets. EIGRP is, by default, enabled on all interfaces included with the network command. To prevent unnecessary traffic, interfaces without neighbors should be made passive.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. RO UTE v 1.0—2-22

Summary (Cont.)

Create and advertise a default route in an EIGRP autonomous system with the ip default-network network-number command. EIGRP performs automatic network-boundary summarization, but administrators can disable automatic summarization and perform manual route summarization on an interface-by-interface basis. Summarizing routes results in smaller routing tables.

For manual route summarization, the summary route is advertised only if a more specific entry of the summary route is present in the routing table.

Lesson 3

Lab 2-1 Debrief

Overview

In Lab 2-1, students configure and verify EIGRP operations. First a student configures basic EIGRP and advertises all the specific subnets used in the network. Next, the student defines EIGRP path selection so that the primary path is preferred and the second path remains as a backup.

Because EIGRP uses a lot of bandwidth and CPU resources, the student must optimize EIGRP operation. The student must also configure EIGRP operation in scalable way, in which

summarization is configured in order to improve convergence time and add stability.

Objectives

Upon completing this lesson, you will be able to explain how to configure and verify EIGRP operations. This ability includes being able to meet these objectives:

Complete the lab overview and verification Describe a sample solution and alternatives

Lab Overview and Verification

This topic describes lab topology, as well as the key checkpoints used to create a solution and start with the verification.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. ROUTE v1. 0—2-2

Lab Topology

The figure above presents the physical lab topology used for Lab 2-1: configure and verify EIGRP operations. The topology uses four pod routers, one backbone router, and one pod switch.

Based on the topology, students will identify the required parameters and configure a basic EIGRP routing protocol in order to establish Layer 3 reachability in the network, as well as influence EIGRP path selection, optimize EIGRP operation, and provide a scalable solution.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. ROUTE v1. 0—2-3

Lab Review: What Did You Accomplish?

Task 1: Configure Basic EIGRP

–What steps did you take to configure the EIGRP routing

protocol and advertise all of the specific IP subnets used in the network?

Task 2: Influence EIGRP Path Selection

–What must be changed so that the primary path is preferred

and the secondary path remains as a backup? Task 3: Optimize EIGRP Operation

–How do you prevent the formation of an adjacency, as well as

preserve interface bandwidth and CPU resources? Task 4: Scale EIGRP Operation

–How is summarization configured in order to improve

convergence time and add to stability?

In the first task, you configured basic EIGRP routing. All routers are configured for EIGRP routing protocol according to the implementation plan.

In the second task, you influenced the EIGRP path selection. You implemented redundancy in the network and the routers are able to select the primary path, while the backup path remains in the routing table. You must also change the metric in order to influence path selection in EIGRP routing protocol.

In the third task, you optimized the EIGRP operation. Routing update suppression prevented the formation of EIGRP adjacencies. At the same time, CPU resources were preserved without the use of filtering. The passive-interface command is the solution to optimize the EIGRP operation in this step.

In the fourth task, you configured scaling options of the EIGRP operation. Summarization was configured to summarize many subnets into one summary route, which was sent to the adjacent routers. Only one summary route is sent instead of many more-specific subnets.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. ROUTE v1. 0—2-4

Verification

Did you have enough information to create the implementation plan?

Do the EIGRP-enabled routers form the adjacencies?

Do you see all of the EIGRP-advertised networks in the IP routing table as EIGRP routes?

Do you see two routes in the IP routing table after manipulating the path where the correct one is preferred?

You cannot see the adjacency where the EIGRP routing protocol packets are suppressed, but the path to the destination still exists via another route; why is this?

Do you see a summary route to Null0 interface as well as many more-specific subnets?

A common approach to verifying the implementation process for configuring EIGRP operations is as follows:

In order to create the implementation plan, sufficient information must be gathered. After a successful EIGRP configuration, all neighboring routers running EIGRP form an adjacency.

Adjacent routers start exchanging routing protocol information and EIGRP routes populate the IP routing table.

When a redundant path exists, one of them becomes primary path. Path manipulation results in the desired path being the primary and redundant paths being the backups. You cannot see the adjacency where EIGRP routing protocol packets are suppressed, but the path to the destination still exists via another route.

The router performing the summarization includes a summary route to the Null0 interface, as well as routes to more-specific subnets. The remaining EIGRP neighbors only have a summary route.

© 2009 Cis co S y st em s, Inc. A ll right s reserved. ROUTE v1. 0—2-5

Checkpoints

Configure the EIGRP routing protocol

Advertise only specific subnets used in the network Manipulate the path by changing the metric

Ensure the backup path still exists in the IP routing table

Suppress the EIGRP routing protocol packet to preserve interface bandwidth and CPU resources without filtering

Enable manual summarization to hide more specific subnets and improve stability

During the configuration and verification phase, a network operator can deal with several checkpoints. After completing all the configuration tasks, the network operator may have successfully configured EIGRP operations, or may need to do additional verification and troubleshooting.

With different checkpoints, the network operator can verify for proper configuration. The following checkpoints are used for verification:

Configure the EIGRP routing protocol.

Advertise only specific subnets used in the network. Manipulate the path by changing the metric.

Ensure that the backup path still exists in the IP routing table.

Suppress the EIGRP routing protocol packet to preserve interface bandwidth and CPU resources without filtering.