Autonomous System

Lab 1.5.2 Unequal-Cost Load Balancing with IGRP

Objective

In this lab, the student will observe unequal-cost load balancing on an IGRP network by using advanced debug commands.

Scenario

Vista has two paths to network 10.0.0.0, but they have unequal IGRP metrics. Configure unequalcost load balancing and use advanced debug features to verify the work.

Step 1

Build and configure the network according to the diagram. If continuing from the previous lab, remove the RIP process (and networks advertised by RIP) with the single command no router rip. Configure IGRP with an autonomous system number of 36, and enable updates on all active interfaces with network commands similar to the following:

SanJose2(config)#router igrp 36 SanJose2(config-router)#network 192.168.2.0 SanJose2(config-router)#network 10.0.0.0

1-3

CCNP 1: Advanced Routing v 3.0 - Lab 1.5.2

Copyright  2003, Cisco Systems, Inc.

Use ping to verify the configuration and test connectivity between all interfaces. Also, because the metric for IGRP includes bandwidth in its calculation, manually configure the bandwidth of serial interfaces in order to ensure accuracy. For the purposes of this lab, Vista alternative paths to network 10.0.0.0 are not of unequal-cost until the appropriate bandwidths are set. Use the following commands to further configure Vista for the correct bandwidth and process switching:

Vista(config)#interface s0/0 Vista(config-if)#bandwidth 128 Vista(config-if)#no ip route-cache Vista(config-if)#interface s0/1 Vista(config-if)#bandwidth 384 Vista(config-if)#no ip route-cache

Use the show interface command output to verify the correct bandwidth settings and the show ip interface command to ensure that fast switching is disabled. 1. Can you set the bandwidth of Ethernet interfaces manually?

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Note: The bandwidth command can be entered in interface configuration mode, but it only effects...