with the highest number of links is in general an energy-efficient choice. Motivated by these works, we are currently targeting the reduction of power consumption in the ISP by assuming that the operator manages a set of contents. Our idea is to exploit the characteristic of the content (type,popularity,etc.) to decide where to store it inside the ISP network to save energy Indeed, there is a tradeoff (in terms of power consumption) between storing multiple version of a given content versus transportion repeatedly this content over the network