It is well-known that the use of path diversity, i.e., the use of multiple end-to-end paths can improve the performance of applications such as multimedia streaming and Voice over IP. Leveraging path diversity requires applications to choose independent paths, i.e., paths that do not share Points of Congestion (PoCs). Although independent paths may not be available, performance can often be improved by selecting paths with the least amount of shared congestion. This paper proposes Shared CONgestion Estimator (SCONE), a tool that provides an estimate of shared congestion between two paths. SCONE sends probe flows along each of these paths and calculates the fraction of drops appearing in correlated bursts as the estimate of shared congestion.
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