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首页> 外文期刊>Journal of interconnection networks >Software-Defined Networking Switches for Fast Single-Link Failure Recovery
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Software-Defined Networking Switches for Fast Single-Link Failure Recovery

机译：软件定义的网络交换机，用于快速单链路故障恢复

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摘要

In this paper, we consider IP fast recovery from single-link failures in a given network topology. The basic idea is to replace some existing routers with a designated switch. When a link fails, the affected router will send all the affected traffic to the designated switch (through pre-configured IP tunnels), which will deliver the affected traffic to its destination without using the failed link. The goal of the approach is to achieve faster failure recovery than traditional routing protocols that employ reactive computing upon link failures. Software-Defined Networking (SDN) switches can serve as the designated switches because they can flexibly redirect affected traffic to other routes, instead of only to the shortest paths in the network. However, SDN switches are very expensive. Our objective is to minimize the number of SDN switches needed and to guarantee that the network can still recover from any single-link failure. For networks with uniform link costs, we show that using normal non-SDN switches with IP tunneling capability as designated switches can guarantee recovery from any single-link failure. For networks with general link costs, we find that not all single-link failures can be recovered by using non-SDN switches as designated switches; by using SDN switches only when necessary, we can reduce the total number of SDN switches needed compared to an existing work. We conduct extensive simulations to verify our proposed approaches.
机译：在本文中，我们考虑了从给定网络拓扑中的单链路故障中快速恢复IP。基本思想是用指定的交换机替换一些现有的路由器。当链接发生故障时，受影响的路由器会将所有受影响的流量（通过预配置的IP隧道）发送到指定的交换机，该交换机将受影响的流量传递到其目的地，而不使用失败的链接。该方法的目标是比在链路故障时采用反应式计算的传统路由协议更快地实现故障恢复。可以将软件定义网络（SDN）交换机用作指定的交换机，因为它们可以将受影响的流量灵活地重定向到其他路由，而不仅仅是重定向到网络中的最短路径。但是，SDN交换机非常昂贵。我们的目标是最大程度地减少所需的SDN交换机数量，并确保网络仍可从任何单链路故障中恢复。对于具有统一链路成本的网络，我们证明了使用具有IP隧道功能的普通非SDN交换机作为指定交换机可以保证从任何单链路故障中恢复。对于具有一般链路成本的网络，我们发现通过使用非SDN交换机作为指定的交换机，并非所有的单链路故障都可以恢复；通过仅在必要时使用SDN交换机，与现有工作相比，我们可以减少所需的SDN交换机总数。我们进行了广泛的仿真，以验证我们提出的方法。

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