Congestion-aware single link failure recovery in hybrid SDN networks

2015 IEEE Conference on Computer Communications (INFOCOM) Pub Date : 2015-08-24 DOI:10.1109/INFOCOM.2015.7218482

C. Chu, Kang Xi, Min Luo, H. J. Chao

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引用次数: 98

Abstract

As service providers have started deploying SDN in their networks, traditional IP routers are gradually upgraded to SDN enabled switches. In other words, the network will have traditional IP routers and SDN switches coexisting, and it is called a hybrid SDN network. With such a network, we take advantage of SDN and propose an approach to guarantee traffic reachability in the presence of any single link failure. By redirecting traffic on the failed link to SDN switches through pre-configured IP tunnels, the proposed approach is able to react to the failures very fast. With the help of coordination among SDN switches, we are also able to explore multiple backup paths for the failure recovery. This allows the proposed approach to avoid potential congestion in the post-recovery network by choosing proper backup paths. Simulation results show that our proposed scheme requires only a very few number of SDN switches in the hybrid SDN network to achieve fast recovery and guarantee 100% reachability from any single link failure. It also shows that the proposed approach is able to better load-balance the post-recovery network comparing to IP Fast Reroute and shortest path re-calculation.

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混合SDN网络中感知拥塞的单链路故障恢复

随着运营商开始在网络中部署SDN，传统的IP路由器逐渐升级为支持SDN的交换机。也就是说，该网络将由传统的IP路由器和SDN交换机并存，称为混合型SDN网络。在这样的网络中，我们利用SDN的优势，提出了一种在任何一条链路出现故障的情况下保证流量可达的方法。通过预先配置的IP隧道将故障链路上的流量重定向到SDN交换机，所提出的方法能够非常快速地对故障做出反应。通过SDN交换机之间的协调，我们还可以探索故障恢复的多条备份路径。通过选择合适的备份路径，所提出的方法可以避免恢复后网络中潜在的拥塞。仿真结果表明，我们提出的方案在混合SDN网络中只需要很少数量的SDN交换机，就可以实现快速恢复，并保证在任何单个链路故障时100%可达。与IP快速路由和最短路径重计算相比，该方法能够更好地实现恢复后网络的负载均衡。

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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2015 IEEE Conference on Computer Communications (INFOCOM)

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