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This paper presents the vision of the Control Exchange Point (CXP)architectural model. The model is motivated by the inflexibility andossification of today's inter-domain routing system, which renders criticalQoS-constrained end-to-end (e2e) network services difficult or simplyimpossible to provide. CXPs operate on slices of ISP networks and are built onbasic Software Defined Networking (SDN) principles, such as the cleandecoupling of the routing control plane from the data plane and the consequentlogical centralization of control. The main goal of the architectural model isto provide e2e services with QoS constraints across domains. This is achievedthrough defining a new type of business relationship between ISPs, whichadvertise partial paths (so-called pathlets) with specific properties, and theorchestrating role of the CXPs, which dynamically stitch them together andprovision e2e QoS. Revenue from value-added services flows from the clients ofthe CXP to the ISPs participating in the service. The novelty of the approachis the combination of SDN programmability and dynamic path stitching techniquesfor inter-domain routing, which extends the value proposition of SDN overmultiple domains. We first describe the challenges related to e2e serviceprovision with the current inter-domain routing and peering model, and thencontinue with the benefits of our approach. Subsequently, we describe the CXPmodel in detail and report on an initial feasibility analysis.

Control Exchange Points: Providing QoS-enabled End-to-End Services via SDN-based Inter-domain Routing Orchestration