O'Reilly logo

IS-IS: Deployment in IP Networks by Alvaro Retana, Russ White

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Domains and Hierarchical Network Design

One for the first questions you need to ask is “Where should I put the L1/L2 borders in a network?” In other words, how do IS-IS domains overlay onto a network's hierarchical structure? Of course, before answering this question, we need to ask yet another—what sort of hierarchy is the network built on? Figure 4-1 illustrates the two most common types.

Figure 4-1. Two models of hierarchical networks

Traditionally, hierarchical network designs have three layers of intermediate systems: the core, distribution, and access layers. Each of these layers serves a specific purpose in the network, splitting network ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required