arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1505.03421cs.NI
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Time4:SDN的时间

Time4: Time for SDN

Tal Mizrahi, Yoram Moses

摘要:

随着软件定义网络(SDN)的兴起,人们对动态和集中式流量工程的兴趣越来越大,其中从网络范围的角度动态地做出关于转发路径的决策。频繁的路径重新配置可以显著提高网络性能,但应谨慎处理,以最大限度地减少网络更新期间可能发生的中断。在本文中,我们介绍了Time4,一种使用精确时间来协调网络更新的方法。Time4是软件化环境中的一个强大工具,可用于各种网络更新场景。具体来说,我们描述了一组更新的情况下,称为流交换,其中Time4是最佳的更新方法,产生更少的数据包丢失比现有的更新方法。我们定义的无损流分配问题,并正式表明,在频繁的路径分配的环境中,需要同时在多个网络设备的变化是不可避免的。我们提出的设计,实施和评估的Time4启用OpenFlow原型。原型是公开的开源。我们的工作包括对OpenFlow协议的扩展,该协议已被开放网络基金会(ONF)采用,现在包含在OpenFlow 1.5中。我们的实验结果显示了Time4与其他网络更新方法相比的显着优势,并展示了没有Time4是不可行的SDN用例。

英文摘要:

With the rise of Software Defined Networks (SDN), there is growing interest in dynamic and centralized traffic engineering, where decisions about forwarding paths are taken dynamically from a network-wide perspective. Frequent path reconfiguration can significantly improve the network performance, but should be handled with care, so as to minimize disruptions that may occur during network updates. In this paper we introduce Time4, an approach that uses accurate time to coordinate network updates. Time4 is a powerful tool in softwarized environments, that can be used for various network update scenarios. Specifically, we characterize a set of update scenarios called flow swaps, for which Time4 is the optimal update approach, yielding less packet loss than existing update approaches. We define the lossless flow allocation problem, and formally show that in environments with frequent path allocation, scenarios that require simultaneous changes at multiple network devices are inevitable. We present the design, implementation, and evaluation of a Time4-enabled OpenFlow prototype. The prototype is publicly available as open source. Our work includes an extension to the OpenFlow protocol that has been adopted by the Open Networking Foundation (ONF), and is now included in OpenFlow 1.5. Our experimental results show the significant advantages of Time4 compared to other network update approaches, and demonstrate an SDN use case that is infeasible without Time4.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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