Routing as a Service

Typically routing is either scalable but inflexible, such as current Internet routing, or flexible but unscalable, such as source routing with with per-flow route discovery. In this paper we argue that to achieve both flexibility and scalability, customized routing should be offered as a service by thirdparty providers. The logical separation of routing from forwarding allows different route selection mechanisms to coexist and to evolve over time as routing requirements change. 1