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Juniper Networks® Field Guide and Reference by Juniper Networks®, Cris Morris, Gary Drenan, Aviva Garrett

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IS-IS

The Intermediate System-to-Intermediate System (IS-IS) protocol is an IGP that uses link-state information to make routing decisions.This protocol originally was developed for routing International Organization for Standardization (ISO) Connectionless Network Protocol (CLNP) packets.

An IS-IS network is a single AS, also called a routing domain, that consists of end systems and intermediate systems. End systems are network entities that send and receive packets. Intermediate systems send and receive packets and relay (forward) packets. (Intermediate system is the Open System Interconnection [OSI] term for a router.) ISO packets are called network protocol data units (PDUs).

In IS-IS, a single AS can be divided into smaller groups called ...

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