|
|
|
| A subtree-based approach to failure detection and protection for multicast in SDN |
| Vignesh Renganathan Raja, Chung-Horng Lung, Abhishek Pandey, Guo-ming Wei, Anand Srinivasan |
| Department of Systems and Computer Engineering, Carleton University, Ottawa, Ontario K1S 5B6, Canada; School of Computer Science, Carleton University, Ottawa, Ontario K1S 5B6, Canada; Eion Inc., Ottawa, Ontario K2K 2E3, Canada |
|
|
|
Abstract Software-defined networking (SDN) has received tremendous attention from both industry and academia. The centralized control plane in SDN has a global view of the network and can be used to provide more effective solutions for complex problems, such as traffic engineering. This study is motivated by recent advancement in SDN and increasing popularity of multicasting applications. We propose a technique to increase the resiliency of multicasting in SDN based on the subtree protection mechanism. Multicasting is a group communication technology, which uses the network infrastructure efficiently by sending the data only once from one or multiple sources to a group of receivers that share a common path. Multicasting applications, e.g., live video streaming and video conferencing, become popular, but they are delay-sensitive applications. Failures in an ongoing multicast session can cause packet losses and delay, which can significantly affect quality of service (QoS). In this study, we adapt a subtree-based technique to protect a multicast tree constructed for OpenFlow switches in SDN. The proposed algorithm can detect link or node failures from a multicast tree and then determines which part of the multicast tree requires changes in the flow table to recover from the failure. With a centralized controller in SDN, the backup paths can be created much more effectively in comparison to the signaling approach used in traditional multiprotocol label switching (MPLS) networks for backup paths, which makes the subtree-based protection mechanism feasible. We also implement a prototype of the algorithm in the POX controller and measure its performance by emulating failures in different tree topologies in Mininet.
|
|
Received: 04 April 2016
Published: 05 July 2016
|
|
|
软件定义网络组播中一种基于Subtree来进行失败检测和保护的方法
目的：在软件定义网络（SDN）中，组播应用（比如实时视频流和视频会议）是非常流行的应用。但是这些应用大多对时延要求很高。一个正在进行的组播会话的失败会导致数据包的丢失和延迟，从而严重影响服务质量（QoS）。本文研究软件定义网络组播应用中失败检测和保护的方法。
创新点：本文提出了一种基于Subtree来对软件定义网络中OpenFlow交换机的组播树进行失败检测和保护的方法。本方法能够在组播树中检测链路或者节点的失败，并且决定流表中组播树中的哪个部分需要改变来从失败中恢复。
方法：利用软件定义网络中的控制平面来进行快速组播失败恢复。在发生失败的情况下，控制器在相应的发生链路或者节点失败的交换机上安装流表。
结论：本方法能够有效地在组播树中检测链路或者节点的失败。利用软件定义网络中的中心控制器，能够快速建立备份链路，从而提高系统的服务质量。
关键词：
软件定义网络,
流表,
组播
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
