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Intermediate System

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  1. Intermediate System to Intermediate System IS-IS Mohit Anchan TYIT-A Roll no- 03

  2. What is Intermediate System to Intermediate system (IS-IS)? • Routing Protocol • moves information efficiently within a computer network • determines the best route for datagrams through a packet-switched network • It was defined in ISO/IEC 10589:2002 as an international standard within the OSI reference design

  3. cont…. • IS-IS is an interior gateway protocol • It is also a link-state routing protocol • It uses Dijkstra's algorithm for computing the best path through the network

  4. IS-IS Network An IS-IS network consists of: • End Systems • Intermediate Systems • Areas • Domains

  5. Types of IS-IS Addresses There are two types of IS-IS addresses: • Network Service Access Point (NSAP) • It is the logical point between the network and transport layers • NSAP address fields are Initial Domain Part (IDP) and the Domain-Specific Part (DSP) • Network Entity Title (NET) • NET addresses identify network layer entities or processes instead of services

  6. Protocol Structure • Intra-domain routing protocol discriminator • PDU type (Protocol Data Unit) • Length indicator • ID length • Version/protocol ID • Version • R - Reserved bits • Maximum area addresses

  7. Thank You.