IS IS Route Selection

Introduction

This page describes the process ISIS takes to pick the best path if multiple route of the same prefix length exist.

Route Selection

  • ISIS Route Selection is based on the following process:
  1. L1 over L2 - select Level 1 routes over Level 2 routes.
  2. Internal over External - if levels are equal, select internal over external.
  3. Lowest Metric - if types are the same select route with lowest metric.
  4. Load Share - if metric is the same for multiple routes, load-share.

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