Achieving Memory-saving Network UpdateJiyang Liu, Liang Zhu, Weiqiang Sun* and Weisheng Hu
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
- *Corresponding Author:
- Weiqiang Sun
State Key Laboratory of Advanced
Optical Communication Systems and Networks
Shanghai Jiao Tong University
Shanghai 200240, China
Tel: +86 21 5474 0000
E-mail: [email protected]
Received Date: December 17, 2015;Accepted: December 22, 2015; Published Date: January 09, 2016
Citation: Liu J, Zhu L, Sun W, Hu W (2016) Achieving Memory-saving Networkss Update. J Inform Tech Softw Eng 6:167. doi:10.4172/2165-7866.1000167
Copyright: ©2016 Liu J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Software defined networking (SDN) offers opportunities to develop high-level abstractions for implementing network update, but current SDN controller platform lacks effect mechanisms for updating network configuration on the fly. There exist two main challenges for implementing network update: 1) network is a distributed system and 2) network controller can only update one network node at a time. Naïvely updating individual nodes may lead to incorrect network behaviors. Elegant solution based on two-phase update can guarantee that traffic will be processed consistently during network update, which means each packet can be routed based either on initial network configuration or target network configuration, but never a mixture of the two. Implementing consistent network update is expensive based on previous approach, and we present mechanisms for memory-saving two-phase network update. Our design addresses one major problem: how to delete the initial configuration effectively from network nodes when controller enforces the target configuration. We propose a hierarchical network metadata structure to accelerate the procedure of removing the initial configuration. Finally, we describe the results of some experiments demonstrating the effectiveness of configuration deletion and the effect of memory-saving for the network.