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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Chapter 3. Integrated IS-IS Routing Protocol Concepts

A span of interconnected routers operated and managed by the same administrative group is referred to as an autonomous system of routers or a routing domain. Such a system of routers allows forwarding of data traffic from one location to the other. The current IS-IS specification, ISO 10589, refers to network nodes as intermediate systems, but this book uses the equivalent terminology of routers more frequently because it is more popular in current networking literature.

Individual routing domains are interconnected to form larger networks, such as the Internet, allowing transfer of data from one routing domain to the other over a large geographic span. Routers use routing protocols to learn ...

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