  Green Traffic Engineering encompasses network design and traffic routing
strategies that aim at reducing the power consumption of a backbone network. We
argue that turning off linecards is the most effective approach to reach this
goal. Thus, we investigate the problem of minimizing the number of active line
cards in a network while simultaneously allowing a multi-commodity flow being
routed and keeping the maximum link utilization below a certain threshold. In
addition to proving this problem to be NP-hard, we present an optimal ILP-based
algorithm as well as a heuristic based on 2-Segment Routing. Lastly, we
evaluate both approaches on real-world networks obtained from the Repetita
Framework and a globally operating Internet Service Provider. The results of
this evaluation indicate that our heuristic is not only close to optimal but
significantly faster than the optimal algorithm, making it viable in practice.
