Intermediate System to Intermediate System IS-IS Mohit Anchan TYIT-A Roll no- 03
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
IS-IS is an interior gateway protocol 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
An IS-IS network consists of: End Systems Intermediate Systems Areas Domains
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
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
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