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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2016 Vol.17 No.7 P.647-660
An OpenFlow-based performance-oriented multipath forwarding scheme in datacenters
Abstract: Although dense interconnection datacenter networks (DCNs) (e.g., FatTree) provide multiple paths and high bisection bandwidth for each server pair, the widely used single-path Transmission Control Protocol (TCP) and equal-cost multipath (ECMP) transport protocols cannot achieve high resource utilization due to poor resource excavation and allocation. In this paper, we present LESSOR, a performance-oriented multipath forwarding scheme to improve DCNs’ resource utilization. By adopting an OpenFlow-based centralized control mechanism, LESSOR computes near-optimal transmission path and bandwidth provision for each flow according to the global network view while maintaining nearly real-time network view with the performance-oriented flow observing mechanism. Deployments and comprehensive simulations show that LESSOR can efficiently improve the network throughput, which is higher than ECMP by 4.9%‐38.3% under different loads. LESSOR also provides 2%‐27.7% improvement of throughput compared with Hedera. Besides, LESSOR decreases the average flow completion time significantly.
Key words: Datacenter network, Traffic engineering, OpenFlow, Multipath transmission
创新点：LESSOR根据控制器的闲忙状态（控制器CPU利用率）动态地调整网络状态的轮询时间（算法1），从而维护更为精细的网络视图；通过使用OpenFlow集中控制手段，LESSOR为短流预安装基于主机粒度负载均衡的路径流表，减小了短流的完成时间并降低了控制器的负载；对于长流，LESSOR根据全局网络视图为每一条流计算近似最优的传输路径和带宽供给（算法2），从而实现更好的负载均衡特性和网络的资源利用率。
方法：我们在Mininet仿真平台上使用数据中心网络拓扑（FatTree和VL2）和真实数据中心网络流量对LESSOR进行仿真验证，同时在真实网络环境下部署了LESSOR原型系统进行了进一步的测试。实验表明LESSOR能有效提高网络吞吐量，在不同水平的网络负载下较现有的ECMP方案提高了4.9%-38.3%，较现有典型的Hedera方案也提高了2%-27.7%。同时，实验结果表明LESSOR能有效减小平均流完成时间。
结论：本文提出的方案能有效提高网络吞吐量（图4）；与Hedera方案相比，本文的方案能有效降低控制器负担，并能充分利用控制器的资源获取更为精细的网络视图（图8）和更高的网络吞吐量（图6）。
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DOI:
10.1631/FITEE.1601059
CLC number:
TP393
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On-line Access:
2016-07-05
Received:
2016-03-07
Revision Accepted:
2016-06-23
Crosschecked:
2016-06-28