The centralized control capability of Software-Defined Networking (SDN) provides an excellent opportunity to enhance the Quality of Service (QoS) routing in networking environments. The end-to-end QoS-aware traffic forwarding must consider the computation latency associated with optimal path selection while reducing the controller's response time. In this paper, we propose SDN-enabled systematic mechanisms that features a queueing scheme, active link delay measurements, efficient statistic estimate of network states, and optimal path computation and selection. We implement our framework as a modular application in the Floodlight SDN controller software and conduct comprehensive experimental studies on the Global Environment for Network Innovations (GENI) testbed. Our performance evaluation demonstrates that the proposed prototype can optimize the control's latency, switching latency, and therefore find optimal end-to-end paths with the minimum delay with the reduced control overhead.
Authors: Mohamed Rahouti (Department of Computer & Information Science, Fordham University), Kaiqi Xiong (University of South Florida), Yufeng Xin (RENCI, University of North Carolina at Chapel Hill),
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