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Today's Internet users and applications are placing increased demands on Internet Service Providers (ISPs) to deliver fine-grained, flexible route control. To assist network operators in addressing this challenge, the authors present the Intelligent Route Service Control Point (IRSCP), a route control architecture that allows a network operator to flexibly control routing between the traffic ingresses and egresses within an ISP's network, without modifying the ISP's existing routers. In essence, IRSCP subsumes the control plane of an ISP's network by replacing the distributed BGP decision process of each router in the network with a more flexible, logically centralized, application-controlled route computation. IRSCP supplements the traditional BGP decision process with an explicitly ranked decision process that allows route control applications to provide a per-destination, per-router explicit ranking of traffic egresses.
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