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Multi-controller Traffic Engineering in Software Defined Networks

机译:软件定义网络中的多控制器流量工程

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Distributed controller architectures in software defined networks raise the issue of switch-controller mapping. In a mapping approach where a switch distributes flow setup requests (traffic) to multiple controllers, a solution that finds the optimal switch-controller mapping and traffic distribution among the controllers for long term performance and responds effectively to network events such as short term traffic variation and controller failure is necessary. We develop a Multi-Controller Traffic Engineering (MCTE) scheme that: i) finds the long term switch-controller mapping and traffic distribution that minimizes flow setup time, ii) manages traffic distribution during short term variation, and iii) pre-computes backup controllers and traffic distribution upon controller failure. We formulate optimization problems for MCTE components and develop heuristic algorithms to obtain solutions in reasonable time. Numerical simulations show that the proposed algorithms achieve flow setup time within 2% of the lower bound and effectively manage traffic upon traffic variations and controller failures.
机译:软件定义网络中的分布式控制器体系结构提出了开关控制器映射的问题。在交换机将流量建立请求(流量)分配到多个控制器的映射方法中,一种解决方案可在控制器之间找到最佳的交换机-控制器映射和流量分配,以实现长期性能,并有效响应网络事件(例如短期流量变化)并且控制器故障是必要的。我们开发了一种多控制器流量工程(MCTE)方案,该方案是:i)找到长期的交换机-控制器映射和流量分配,以最大程度地减少流量建立时间; ii)在短期变化期间管理流量分配,并且iii)预计算备份控制器故障和控制器故障时的流量分配。我们为MCTE组件制定优化问题,并开发启发式算法以在合理的时间内获得解决方案。数值模拟表明,所提出的算法可在下限的2%之内实现流量建立时间,并在流量变化和控制器故障时有效地管理流量。

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