Coping with link failures in centralized control plane architectures

2010 Second International Conference on COMmunication Systems and NETworks (COMSNETS 2010) Pub Date : 2010-01-05 DOI:10.1109/COMSNETS.2010.5431977

Maulik Desai, T. Nandagopal

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引用次数: 42

Abstract

Recently proposed SoftRouter and 4D network architectures recommend having the least amount of intelligence in the switches. They advocate transferring control plane functionalities to general-purpose servers that could govern these switches remotely. A link failure in such architectures could result into switches losing contact with the controller or even generating routing loops. These scenarios could generate a large amount of unnecessary traffic in the network. We study the implications of a failed link in such architectures. We develop an algorithm that would inform only the relevant switches to refrain from sending messages in the direction of the failed link, and yet have the minimum amount of intelligence on the switches. We implement our algorithm on a network formed by OpenFlow switches and evaluate its performance. Our experiments verify that the performance of our algorithm is dependent on the total number of flow-table entries in a switch. We also verify that by implementing our algorithm all the necessary switches are informed of the failed link significantly sooner than the controller identifies the failed link and sends out an update.

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集中控制平面架构中链路故障的处理

最近提出的SoftRouter和4D网络架构建议在交换机中使用最少的智能。他们主张将控制平面的功能转移到可以远程管理这些交换机的通用服务器上。这种架构中的链路故障可能导致交换机与控制器失去联系，甚至产生路由环路。这些场景可能会在网络中产生大量不必要的流量。我们研究了这种体系结构中失效链接的含义。我们开发了一种算法，该算法仅通知相关交换机避免向故障链路的方向发送消息，并且在交换机上具有最小的智能。我们在OpenFlow交换机组成的网络上实现了我们的算法，并评估了它的性能。我们的实验验证了算法的性能依赖于交换机中流表条目的总数。我们还验证，通过实现我们的算法，所有必要的交换机都能在控制器识别出故障链路并发出更新之前获知故障链路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2010 Second International Conference on COMmunication Systems and NETworks (COMSNETS 2010)

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