Networking

Distributed Probabilistic Network Traffic Measurements

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Executive Summary

Measuring the per-flow traffic in large networks is very challenging due to the high performance requirements on the one hand, and due to the necessity to merge locally recorded data from multiple routers in order to obtain network-wide statistics on the other hand. The latter is nontrivial because traffic that traversed more than one measurement point must only be counted once, which requires duplicate-insensitive distributed counting mechanisms. Sampling-based traffic accounting as implemented in today's routers results in large approximation errors, and does not allow for merging information from multiple points in the network into network-wide total traffic statistics.

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