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Power Awareness in Network Design and Routing



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Power Awareness in Network Design and Routing Joseph Chabarek Joel Sommers Paul Barford Cristian Estan David Tsiang Steve Wright University of Wisconsin Madison jpchaba jsommers pb estan swright cs wisc edu Cisco Systems tsiang cisco com Abstract Exponential bandwidth scaling has been a fundamental driver of the growth and popularity of the Internet However increases in bandwidth have been accompanied by increases in power consumption and despite sustained system design efforts to address power demand significant technological challenges remain that threaten to slow future bandwidth growth In this paper we describe the power and associated heat management challenges in today s routers We advocate a broad approach to addressing this problem that includes making powerawareness a primary objective in the design and configuration of networks and in the design and implementation of network protocols We support our arguments by providing a case study of power demands of two standard router platforms that enables us to create a generic model for router power consumption We apply this model in a set of target network configurations and use mixed integer optimization techniques to investigate power consumption performance and robustness in static network design and in dynamic routing Our results indicate the potential for significant power savings in operational networks by including power awareness I I NTRODUCTION In the last decade the Internet transformed from a computer network used primarily by academics into a worldwide communication medium with significant impact on the global economy The role of the Internet will perhaps be even more important in the future prompting Ray Ozzie Microsoft s CTO to recently state that We re in a new era an era in which the Internet is at the center 1 The tremendous growth in the number of end users and their network connection speeds has resulted in a consistent exponential increase in the bandwidth demand To keep pace Internet Service



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