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An imbalanced traffic model is presented and the performance of completely shared buffering and output queueing under imbalanced traffic is studied. It is found that shared buffering performs poorer than output queueing under this traffic condition. We then propme a buffer management policy, called Drop on Demand, which yields a greater switch throughput and lower packet loss probability than previously proposed policies for all input traffic rates. Inspired by the result, we study the optimal buffer management policy for a class of dynamic buffer allocation schemes with packet purging action. It is found that there exists an optimal stationary policy which can be obtained by solving a linear programming problem.

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