Abstract—Using a uniquemonitoring experiment, we capture all packets crossing a (lightly utilized) operational access router from a Tier-1 provider, and use them to provide a detailed examination of router congestion and packet delays. The complete capture en- ables not just statistics as seen from outside the router, but also an accurate physical router model to be identifi ed. This enables a comprehensive examination of congestion and delay from three points of view: the understanding of origins, measurement, and re- porting. Our study defi nes new methodologies and metrics. In par- ticular, the traffi c reporting enables a rich description of the diver- sity of microcongestion behavior, without model assumptions, and at achievable computational cost. Index Terms—

congestion routing.pdf

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