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Due to recent large-scale deployments of delay and loss-sensitive applications, there are increasingly stringent demands on the monitoring of service level agreement metrics. Although many end-to-end monitoring methods have been proposed, they are all based on active probing and thus inject measurement traffic into the network. This paper proposes a new scheme for monitoring service level agreement metrics, in particular, delay distribution. The scheme is passive and therefore will not cause perturbation to real traffic. Using realistic delay and traffic demands, the paper shows that the scheme achieves high accuracy and can detect burst events that will be missed by probing based methods.
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