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More is not always better: an analytical study of controller synchronizations in distributed SDN

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Title: More is not always better: an analytical study of controller synchronizations in distributed SDN
Authors: Zhang, Z
Ma, L
Leung, KK
Le, F
Item Type: Journal Article
Abstract: Distributed software-defined networks (SDN), consisting of multiple inter-connected network domains, each managed by one SDN controller, is an emerging networking architecture that offers balanced centralized control and distributed operations. In such networking paradigm, most existing works focus on designing sophisticated controller-synchronization strategies to improve joint controller-decision-making for inter-domain routing. However, there is still a lack of fundamental understanding of how the performance of distributed SDN is related to network attributes, thus impossible to justify the necessity of complicated strategies. In this regard, we analyse and quantify how the performance enhancement of distributed SDN architectures is influenced by inter-domain synchronization levels, in terms of the resulting number of abstracted routing clusters, and network structural properties. Based on a generic network model incorporating link preference for path constructions, we establish analytical lower bounds for quantifying the routing performance under any arbitrarily given network synchronization status. The significance of these performance bounds is that they can be used to quantify the contribution of controller synchronization levels in improving the network performance under different network parameters, which therefore serves as a fundamental guidance for future SDN performance analysis and protocol designs.
Issue Date: Aug-2021
Date of Acceptance: 10-Mar-2021
URI: http://hdl.handle.net/10044/1/88861
DOI: 10.1109/tnet.2021.3066580
ISSN: 1063-6692
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Start Page: 1580
End Page: 1590
Journal / Book Title: IEEE/ACM Transactions on Networking
Volume: 29
Issue: 4
Copyright Statement: © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor/Funder: IBM United Kingdom Ltd
Funder's Grant Number: PO 4603 458 249
Keywords: Science & Technology
Computer Science, Hardware & Architecture
Computer Science, Theory & Methods
Engineering, Electrical & Electronic
Computer Science
Analytical models
Logic gates
Computer architecture
Distributed SDN
SDN controller synchronization
performance evaluation
network analysis
Networking & Telecommunications
0805 Distributed Computing
0906 Electrical and Electronic Engineering
1005 Communications Technologies
Publication Status: Published
Online Publication Date: 2021-03-26
Appears in Collections:Computing
Electrical and Electronic Engineering
Faculty of Engineering