IS IS Router Roles

Introduction

IS-IS has three roles for routers: Level 1, Level 2 and Level 1-2. Each role has different properties.

Router Roles

  • By default Cisco routers running ISIS will be Level-1-2.

Level 1

  • L1 routers only have neighbors in the same area.
  • Has LSDB with level 1 information only.

Level 2

  • Has LSDB with level 1 information only.

Level 1-2

  • Has LSDB with level 1 information and LSDB with level 2 information.

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