Exploring the Impact of Critical Programmability on Controller Placement for Software-Defined Wide Area Networks

Songshi Dou, Li Qi, Chao Yao, Zehua Guo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Control latency is a critical concern for deploying Software-Defined Networking (SDN) into Wide Area Networks (WANs). A Software-Defined WAN (SD-WAN) can be divided into multiple domains controlled by multiple controllers with a logically centralized view. The control latency is related to the placement of controllers and mappings between switches and controllers. Existing solutions usually consider the propagation delay between switches and controllers as the evaluation metric and fail to consider many important factors of dynamic network states. In this paper, we propose ProgrammabilityExplorer (PE) to optimize the control latency in SD-WAN. Inspired by the selection of critical flows, which have a critical impact on network performance, PE considers the programmability of critical flows at switches and uses this metric to decide the placement of controllers and mappings between switches and controllers. Simulation results show that PE can reduce the control latency by up to 62.3%, 27.5%, 58.3%, and 61.7% under GÉANT, Abilene, Sprintlink, and Tiscali topologies respectively, compared with baseline algorithms.

Original languageEnglish
Pages (from-to)2575-2588
Number of pages14
JournalIEEE/ACM Transactions on Networking
Volume31
Issue number6
DOIs
Publication statusPublished - 1 Dec 2023

Keywords

  • Software-defined networking
  • control latency
  • controller placement
  • critical programmability
  • switch-controller mapping
  • wide area networks

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