1 research outputs found
A Survey of Energy Efficiency in SDN Software Based Methods and Optimization Models
Software Defined Networking (SDN) paradigm has the benefits of programmable
network elements by separating the control and the forwarding planes,
efficiency through optimized routing and flexibility in network management. As
the energy costs contribute largely to the overall costs in networks, energy
efficiency has become a significant design requirement for modern networking
mechanisms. However, designing energy efficient solutions is non-trivial since
they need to tackle the trade-off between energy efficiency and network
performance. In this article, we address the energy efficiency capabilities
that can be utilized in the emerging SDN. We provide a comprehensive and novel
classification of software-based energy efficient solutions into subcategories
of traffic aware, end system aware and rule placement. We propose general
optimization models for each subcategory, and present the objective function,
the parameters and constraints to be considered in each model. Detailed
information on the characteristics of state-of-the-art methods, their
advantages, drawbacks are provided. Hardware-based solutions used to enhance
the efficiency of switches are also described. Furthermore, we discuss the open
issues and future research directions in the area of energy efficiency in SDN.Comment: 17 double column pages, 3 figures, 6 table