This disquisition presents a energy consumption in a network which is a important physical factor against this everlasting increase in network traffic. Since current equipment in network consumes energy inefficiently due to poor energy load proportionality we have modeled a packet optical transport networks. By employing integer linear programming (ILP), we model and optimize the energy consumption of IP/WDM (IP/WDM) networks with traffic-grooming cross layer designs. Also our study shows the energy savings in IP/WDM network. In addition to that for energy proportionality of network equipment different network schemes are required.

1. Yoontae Kim, Chankyun Lee, June-Koo Kevin Rhee, Member, IEEE, and Sang youm Lee "IP-
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Cross-layer Design Optical Networks Minimal Energy Control Network.