Cisco Systems CCNA 2 manual Troubleshooting Igrp

the networks advertised, timer values, and other routing protocol-specific information. The show ip route command displays the routing table and lists the next hop to all known networks, how the route was learned, the metric, and other route specific information. The show run command can be used to verify the running configuration. Have the students verify proper operation of IGRP on the lab topology.

7.3.8 Troubleshooting IGRP

Most of the IGRP configuration errors involve a bad network statement, discontiguous subnet, or incorrect autonomous system number. The following commands are used to troubleshoot IGRP:

•show ip protocols

•show ip route

•debug ip igrp events

•debug ip igrp transactions

•ping

•trace

Both the debug ip igrp events and debug ip igrp transactions commands can be used to verify that routing information is being passed between routers. The ping command can be used to test network connectivity. The trace command can be used to locate pinpoint delay or connectivity issues. Have the students take a break and place several IGRP problems on the lab topology. When the students return from the break, instruct them to troubleshoot the topology and correct any problems they find. Emphasize the fact that the show run command, which makes it easy to troubleshoot problems in a lab, may not be very effective in real situations. The show run command should be used to verify configuration changes.

90 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 7 Copyright ♥ 2004, Cisco Systems, Inc.