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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 48. Open System Interconnection Routing Protocols

Objectives

  • Understand the background and role of ES-IS, IS-IS, and IDRP.

  • Describe the general operation of ES-IS.

  • Explain the IS-IS routing architecture.

  • Examine the use of IS-IS for CLNS routing and IP routing.

  • Describe the IS-IS packet types and formats.

  • Look at some of the additional features supported by IS-IS.

  • Describe the general operation of IDRP.

Intermediate System–to–Intermediate System (IS-IS) is based on work originally done at Digital Equipment Corporation (Digital) for DECnet/OSI (DECnet Phase V). IS-IS originally was developed to route in ISO Connectionless Network Protocol (CLNP) networks. A version has since been created that supports both CLNP and IP networks; this version usually ...

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