دانلود رایگان مقاله طراحی توپولوژی مجازی صرفه جویی در انرژی در IP در شبکه های مش WDM

Abstract

Energy efficiency has been well recognized as an important objective in design of IP over WDM mesh networks. While previous works always focus on energy minimization through green routing and resource provisioning, the comprehensive performances of the two-layer network cannot be guaranteed. This would be not good for realization of energy-efficient networking methods. In this paper, we first study the problem of getting a good tradeoff between the three-part network comprehensive performances: energy efficiency, resource efficiency and cross-layer survivability efficiency for IP over WDM mesh networks under the static traffic demand. We present the virtual-link energy model for two-layer networks. The energy model is computed from the power consumption value of commercial network devices. Based on the energy-aware two-layer auxiliary graph, we propose a new Energy-Efficient Virtual Topology Design (E2VTD) scheme. The novelty of our proposed E2VTD scheme is mainly twofold as following: the first is the energy-efficient virtual link direct mapping and rerouting and the second is the cross-layer survivability improvement for energy-efficient virtual topology. We use extensive simulations to demonstrate the efficiency of our proposed E2VTD scheme. It is shown that the network comprehensive performances are significantly improved for two-layer networks. Compared with the previous algorithms, network energy consumption is reduced by about 39.8%, network resource is reduced by about 28.2%, and cross-layer topology survivability can be enhanced by about 35.7% in average.

6. Conclusion

In this paper, we have investigated the problem of energyefficient topology design for IP over WDM mesh networks. In particular, we propose a novel scheme, namely, E2VTD, for getting a good tradeoff between energy efficiency, resource efficiency and cross-layer survivability efficiency. Our proposed scheme includes two main algorithms. The VLDMR algorithm first initializes the energy-efficient virtual topology by establishing direct virtual links for multi-granularity connections, then reroutes the connections on low-utilization virtual links to further diminish network energy. The ECSI algorithm improves cross-layer survivability of virtual topology by remapping virtual links onto physical links. Simulation results demonstrate the good performance of the E2VTD scheme. Compared with the previous algorithms, network energy consumption is reduced by about 39.8%, network resource is reduced by about 28.2%, and cross-layer topology survivability can be enhanced by about 35.7% in average.