Chapter 11. Troubleshooting IS-IS

This chapter covers the following key topics:

Troubleshooting of IS-IS adjacency problems

Troubleshooting of IS-IS routing update problems

IS-IS errors

CLNS ping and traceroute

Case study: ISDN configuration problem

Chapter 10, “Understanding Intermediate System-to-Intermediate System (IS-IS),” provides an overview of the IS-IS routing protocol, covering IS-IS protocol concepts and basic con-figuration on Cisco routers. In line with the overall theme of this book, this chapter covers troubleshooting of IS-IS routing problems. Cisco routers and IOS Software provide the framework for the ensuing discussions, which focus on only IP-related issues. Two main categories of IS-IS routing problems exist:

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