September 1999
Intermediate to advanced
416 pages
11h 5m
English
Content preview from Designing Wide Area Networks and Internetworks: A Practical GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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7. Determining the Levels of Hierarchy
Most internetworks today are constructed in a layered, hierarchical fashion. Traffic at the fringes of the internetwork is concentrated into successively denser aggregates as you proceed toward the center, gaining economies of scale at each step. This concentration enables the core of the network to take advantage of economies of scale on carrier circuits and services, even when the individual access connections are not big enough to benefit from them.
Hierarchy is primarily an abstraction, an aid to description. It helps us to understand the internetwork. In addition, hierarchy can result in a more manageable and more cost-effective network. There may be further benefit in propagating the hierarchical layering ...
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