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

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Processing Resources

You might recall from Chapter 6, “The Shortest Path First Algorithm,” that the amount of routing information carried in the network has direct bearing on the load placed on the route processors in routers during routing churns. Until recently, the computational toll of the SPF Algorithm posed a significant challenge to IP routers.

Fortunately, the architecture of modern routers provides a clean separation between the data forwarding plane and the control plane. Therefore, route processors in most modern routers are hardly involved in heavy-duty packet forwarding. In such routers, the route processor dedicates most of its processing recources to control plane activities, including route computation. Also, the faster CPUs used ...

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