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The authors describe a prototype tool that analyzes combined aspects of reliability and performance for a variety of networks. The network-wide analysis systematically generates failure scenarios (called network states), maps their effects from the physical to the network to the traffic layer, calculates the probability of each state, and evaluates a metric on it, until the expected value of the metric or a point on its distribution is estimated to sufficient accuracy. They describe an application of this multi-layer probabilistic methodology to dealing with partial link failures in an ISP backbone network.
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