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Algorithms for Fault-Tolerant Placement of Stateful Virtualized Network Functions

Yang, B; Xu, Z; Chai, W; Weifa, L; Tuncer, D; Galis, A; Pavlou, G; (2018) Algorithms for Fault-Tolerant Placement of Stateful Virtualized Network Functions. In: 2018 IEEE International Conference on Communications (ICC). IEEE Green open access

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Abstract

Traditional network functions (NFs) such as firewalls are implemented in costly dedicated hardware. By decoupling NFs from physical devices, network function virtualization enables virtual network functions (VNF) to run in virtual machines (VMs). However, VNFs are vulnerable to various faults such as software and hardware failures. To enhance VNF fault tolerance, the deployment of backup VNFs in stand-by VM instances is necessary. In case of stateful VNFs, stand-by instances require constant state updates from active instances during its operation. This will guarantee a correct and seamless handover from failed instances to stand-by instances after failures. Nevertheless, such state updates to stand-by instances could consume significant network bandwidth resources and lead to potential admission failures for VNF requests. In this paper, we study the fault-tolerant VNF placement problem with the optimization objective of admitting as many requests as possible. In particular, the VNF placement of active/stand-by instances, the request routing paths to active instances, and state transfer paths to stand-by instances are jointly considered. We devise an efficient heuristic algorithm to solve this problem, and propose a bicriteria approximation algorithm with performance guarantees for a special case of the problem. Simulations with realistic settings show that our algorithms can significantly improve the request admission rate compared to conventional approaches.

Type: Proceedings paper
Title: Algorithms for Fault-Tolerant Placement of Stateful Virtualized Network Functions
Event: IEEE International Conference on Communications, 20-24 May 2018, Kansas City, USA
Location: Kansas City USA
Dates: 20 May 2018 - 24 May 2018
ISBN-13: 978-1-5386-3180-5
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ICC.2018.8422444
Publisher version: https://doi.org/10.1109/ICC.2018.8422444
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Fault tolerance , Fault tolerant systems , Delays , Bandwidth , Routing , Software , Approximation algorithms
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10043623
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