IS IS Troubleshooting Overview

Introduction

This page is related to common ISIS issue and potential causes.

Adjacency Problems

No Adj

  • Potential issues:
    • Physical Link issues
    • ISIS interface configuration
    • Level Mismatch
    • Incorrect Subnet (I was not able to reproduce subnet issue, maybe other versions).
    • Duplicate system ID
  • Details of Level Mismatch
  • Details of Duplicate System ID

INIT State

  • Potential issues:
    • MTU mismatch
    • Authentication
    • Transmitted Hellos are not getting to the neighbor.

Neighbor Adj but using ES-IS Protocol type

  • Potential issues:
    • MTU mismatch
    • Authentication
    • Receiving Hellos are not getting to the neighbor, either corrupted of filtered.

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