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In this chapter, the authors perform a careful sensitivity analysis of a power model for the Internet core: their results show that, no matter how carefully the data upon which the power-consumption model relies is chosen and cross-verified, the uncertainty of the overall results remains disappointingly high. The authors believe that part of the solution lies in a community-wide effort, to which they offer some initial guidance that could, if not solve the issue, at least greatly improve the current situation.

Research on energy-efficiency of communication networks has already gained the attention of a broad research community. Specifically, we consider efforts towards improving environmental sustainability by making networks energyaware. An important step in this direction is establishing a comprehensive methodology for measuring and reporting the energy consumption of the network. In this work, we compare and contrast various energy-related metrics used in the recent literature, by means of a taxonomy definition, as well as through relevant case studies. We believe this to be a first necessary step towards the definition of a common framework for the performance evaluation of energy-aware networks.