摘要:近些年，全球范围内的互联网高能耗问题引发了持续关注，节能已成为未来互联网研究的热门议题之一.面向主干网，提出一种网络级绿色节能机制：一方面，在全局视图中使用最小剩余容量优先的绿色路由算法规划全局路由路径，这样使得网络中开启的捆绑链路数目最小，从而实现第一步节能；另一方面，在局部视图中使用绿色降序最佳适应算法将流量负载汇聚到捆绑链路中的最小物理链路集合，这样可以尽可能多地关闭物理链路，从而实现进一步节能.提出的机制在节能的同时兼顾用户QoS需求的满足，在提供QoS保证的前提下最大化节能收益.为了全面评估该机制，选取3个典型主干网拓扑：CERNET2，GéANT和INTERNET2，分别在高负载、中负载和低负载的情形下，与其他3种节能机制从网络功耗和网络性能（平均路由跳数、物理链路关闭数目、路由成功率和运行时间）方面做详尽的对比分析.仿真结果表明：该机制节能效果显著，且有令人满意的性能表现.



Abstract:Recently, the world-wide huge energy consumption of Internet has incurred a sustained attention, and energy saving has turned into one of the hot issues in the upcoming future networks in the past few years. A network-level green energy-saving mechanism over the backbone networks is proposed in this study: for one thing, in the global view, a smallest remaining capacity first (SRCF) based green routing algorithm is used to plan the global routing paths in the networks, which makes the number of the bundled links powered minimum and thus realizes the first step of energy saving; for the other, in the local view, a green-best fit deceasing (G-BFD) algorithm is used to gather traffic loads flowing through a bundled link to the smallest set of physical links, which enables the physical links powered off as much as possible and thus implements the further energy saving. In addition to saving energy, the proposed mechanism pays attention to guaranteeing the user's requirements on quality of service (QoS), that is, the mechanism maximizes the benefits of energy saving under the premise of providing QoS guarantee. In order to evaluate the proposed mechanism in the study comprehensively, the topologies of three typical backbone networks, namely CERNET2, GéANT, and INTERNET2, are chosen. Under the different traffic status of high load, medium load, and low load, the proposed mechanism is compared with the other three energy-saving mechanisms with regard to network power consumption and network performance (as for average routing hops, the number of physical links powered off, routing success rate, and running time) and further the differences among them are analyzed fully. The results of simulation indicate that the proposed mechanism has a remarkable energy saving effect and a satisfactory performance.



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