An Experimental Feasibility Study on Applying SDN Technology to Disaster-resilient Wide Area Networks
An Experimental Feasibility Study on Applying SDN Technology to Disaster-resilient Wide Area Networks
复制标题
SDN技术应用于抗灾广域网的实验可行性研究
DOI：
10.1007/s12243-016-0502-2
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发表时间：
2016
影响因子：
1.9
通讯作者：
Kien Nguyen and Shigeki Yamada
中科院分区：
文献类型：
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作者：
Takahiro Komamizu;Toshiyuki Amagasa;and Hiroyuki Kitagawa;Kien Nguyen and Shigeki Yamada
当地震、海啸等意外灾害发生时，互联网可能会受到灾难性的影响。因此，有必要为互联网骨干网配备弹性技术，以应对挑战（例如，链路、设备故障、重新路由流量等）在灾难中。新兴的软件定义网络（SDN）技术在逻辑上将网络功能集中在控制器上并远程管理分布式SDN设备，显示出很大的潜力。本文提出了一个实验性的可行性研究应用SDN广域骨干的灾难恢复的目的。为了展示SDN技术在快速响应网络状况变化方面的效率，我们在假设灾难场景的真实的SDN设备和基于SDN的大规模广域网（WAN）上进行了三次评估。在第一次评估中，我们探索了在SDN设备上使用快速故障切换的主动恢复机制。在第二部分中，我们研究了控制器和SDN设备之间的通信延迟，这是软件定义骨干网中反应式恢复的最重要因素之一。在最后一个示例中，我们实验了灾难场景中TCP流的快速端到端反应式恢复行为。评估结果清楚地表明，基于SDN的广域网在技术上是可行的，并有效地从灾难中快速恢复。
The Internet may get catastrophic impacts when unexpected disasters such as earthquakes, tsunami, etc. happen. Therefore, it is necessary to equip resilient technologies for the Internet backbones in order to face challenges (e.g., link, device failures, rerouting traffic, etc.) in the disasters. The emerging software-defined networking (SDN) technology, which logically centralizes network function on a controller and remotely manages distributed SDN devices, shows a lot of potential. This paper presents an experimental feasibility study on applying SDN to wide area backbones for the disaster-resilient purpose. To show the efficiency of SDN technology in responding fast to the network situation changes, we conduct three evaluations on real SDN devices and large-scale SDN-based wide area networks (WANs) assuming disaster scenarios. In the first evaluation, we explore the proactive recovery mechanism using thefast failoveron SDN devices. In the second one, we investigate the communication latency between controllers and SDN devices, which is one of the most important factors in the reactive recovery in the software-defined backbone. In the last one, we experiment the fast end-to-end reactive recovery behavior of a TCP flow in a disaster scenario. The evaluation results clearly indicate that the SDN-based WAN is technically feasible and effective for fast recovery from disasters.