Internet backbones continue to grow at explosive rates, fueled by the bandwidth demands of new applications and by the advent of faster access technologies. To accommodate such growth while preserving the robustness of the network, most IP backbone operators have chosen a simple approach to traffic engineering: overprovisioning. This paper studies traffic demands in an IP backbone, identifies the routes used by these demands, and evaluates traffic granularity levels that are attractive for improving the poor load balancing that our study reveals.
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