This chapter covers the following key topics:
• Troubleshooting of IS-IS adjacency problems
• Troubleshooting of IS-IS routing update problems
• 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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