EIGRP Redistribution and Route Control

Lab 21: Default Routing, Filtering, and Unequal -Cost Load Sharing in IGRP Networks ”Part I

Practical Scenario

Most IGRP networks have evolved into EIGRP networks, but some still remain . When working with IGRP networks, it is key to be able to control routing updates and propagate default information.

The following lab gives you practice in controlling routing updates, filtering, and default routing.

Lab Exercise

The Sea Shepherd Conservation Society (SSCS), or Sea Shepherd International, is a powerful group of environmentalists committed to defending a segment of the world's population that has no voice. The SSCS has an organized navy that goes by the code name Neptune. The navy has several ships that operate out of various ports across the globe and patrol ecological hot spots enforcing United Nations sanctions. The Neptune Navel Intelligence Network links the various departments of the navy to allow the SSCS quick access to important data. Your task is to configure an IGRP network by using the following parameters as design guidelines:

• Configure an IP network, as depicted in Figure 10-6, using IGRP as the routing protocol and 65,001 as the Autonomous System ID.

  Figure 10-6. Neptune Naval Intelligence Network

  

• Configure a default network to 204.30.121.0/24 from the sea_shepherd router, and propagate it throughout the IGRP domain.

• The ocean_warrior router has a private subnet of 172.16.128.0/24. Prevent only the mirage router from seeing this subnet.

• Configure the ocean_warrior router to use all possible paths to the default network.

• Optional: Configure IGRP so that broadcasts are less intensive on the LAN segment between the ocean_warrior, sirenian, and mirage routers.

Lab Objectives

• Configure the Neptune Naval Intelligence Network as depicted in Figure 10-6. Configure IP as denoted in the diagram. The LAN topology type is not important in this lab.

• Use HDLC as the data-link protocol on the WAN.

• Configure a default network and propagate it throughout the IGRP domain.

• Configure unequal-cost load balancing to the default network from the ocean_warrior router.

• Filter subnet 172.16.128.0/24 of the ocean_warrior router from reaching the mirage router. You might need to configure multiple access lists to accomplish this.

• Optional: Configure IGRP unicast updates on the LAN segment between the ocean_warrior, sirenian, and mirage routers.

Equipment Needed

• Four Cisco routers. Three will be connected through V.35 back-to-back cables or in a similar manner.

• Three LAN segments, provided through hubs or switches.

• You might want to test the configuration by adding a workstation with the IP address of 204.30.121.31 on the subnet of the sea_shepherd router.

Physical Layout and Prestaging

• Connect the hubs and serial cables to the routers, as shown in Figure 10-6.

• Optional: Configure an IP workstation with the address of 204.30.121.3 to test the network.