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Title: Joint optimization of primary and backup controller placement and availability link upgrade in SDN networks
Authors: Santos, Dorabella 
Gomes, Teresa Martinez dos Santos 
Keywords: SDN; availability; controller placement; spine; integer linear programming; bi-objective
Issue Date: Nov-2021
Publisher: Elsevier
Project: UIDB/00308/2020 
Serial title, monograph or event: Optical Switching and Networking
Volume: 42
Abstract: In Software-Defined Networking (SDN), the control and data planes are decoupled, leading to a more programmable and efficient network management. In this paper, the controller placement problem in SDN is addressed, jointly with the problem of exploring a high-availability tree subgraph, in order to support delay and availability requirements between the switches and the controllers. We consider that each switch connects to a primary and to a backup controller. We formulate the joint optimization model as an integer linear programming model (ILP), and propose a heuristic method when the exact model becomes impractical. Furthermore, we compare two ILP formulations, and we also compare the controller redundancy solutions with those considering path redundancy alone.
ISSN: 1573-4277
DOI: 10.1016/j.osn.2021.100634
Rights: embargoedAccess
Appears in Collections:I&D INESCC - Artigos em Revistas Internacionais
FCTUC Eng.Electrotécnica - Artigos em Revistas Internacionais

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