Abstract
The energy consumption of information and communications technology
networks is increasing rapidly as a result of the Internet expansion in reach
and capacity. In this paper, we investigate energy-efficient physical topologies
for backbone IP over wavelength-division multiplexing (WDM) networks. We develop
a mixed integer linear programming model to optimize the physical topology
of IP over WDM networks with the objective of minimizing the network total
power consumption. We consider the National Science Foundation network topology
and compare its energy consumption with the energy consumption of optimized
physical topologies under different IP over WDM approaches and nodal degree
constraints. We study the physical topology optimization under a symmetric
full-mesh connectivity traffic matrix and an asymmetric traffic demand, where
data centers create a hot node scenario in the network. We also investigate
the power savings obtained by deploying topologies that eliminate the need
for IP routers, including a full-mesh topology and a star topology. Simulation
results show that the full-mesh and star topologies result in significant
power savings of 95% and 92%, respectively. Furthermore, the optimization
of the physical topology is investigated considering the presence of renewable
energy sources in the network. The results show that optimizing the physical
topology increases the utilization of the renewable energy sources.
© 2012 IEEE
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