The centralized control capability of Software Defined Networking (SDN) presents a unique opportunity for enabling Quality of Service (QoS) routing. For delay sensitive traffic flows, a QoS mechanism efficiently computes path latency and minimizes a controller's response time. At the core of the challenges is how to handle short term network state fluctuations in terms of congestion and latency while guaranteeing the end-to-end latency performance of networking services. The disclosed technology provides a systematic framework that considers active link latency measurements, efficient statistic estimate of network states, and fast adaptive path computation. The disclosed technology can be implemented, for example, as an SDN controller application, and can find optimal end-to-end paths with minimum latency and significantly reduce the control overhead.USF inventors have designed a mechanism that leverages both the global control and centralized view of the SDN to optimize the E2E latency, including latencies associated both with path search and selection, and controller-switch communication. The framework is implemented as an SDN controller application and then experimented extensively on the Global Environment for Network Innovations (GENI), a real-world distributed network testbed. The framework was proven to outperform state-of-the-art in terms of average relative error of individual links, E2E delay and controller overhead, and estimate the actual latency accurately.
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