On-line path computation and function placement in SDNs

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Abstract

We consider service requests that arrive in an online fashion in Software-Defined Networks (SDNs) with network function virtualization (NFV). Each request is a flow with a high-level specification of routing and processing (by network functions) requirements. Each network function can be performed by a specified subset of servers in the system. The algorithm needs to decide whether to reject the request, or accept it and with a specific routing and processing assignment, under given capacity constraints (solving the path computation and function placement problems). Each served request is assumed to “pay” a prespecified benefit and the goal is to maximize the total benefit accrued. In this paper we first formalize the problem, and propose a new service model that allows us to cope with requests with unknown duration without preemption. The new service model augments the traditional accept/reject schemes with a new possible response of “stand by.” We also present a new expressive model to describe requests abstractly using a “plan” represented by a directed graph. Our algorithmic result is an online algorithm for path computation and function placement that guarantees, in each time step, throughput of at least a logarithmic fraction of a (very permissive) upper bound on the maximal possible benefit.

Original languageEnglish
Title of host publicationStabilization, Safety, and Security of Distributed Systems - 18th International Symposium, SSS 2016, Proceedings
EditorsFranck Petit, Borzoo Bonakdarpour
PublisherSpringer Verlag
Pages131-147
Number of pages17
ISBN (Print)9783319492582
DOIs
StatePublished - 2016
Event18th International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2016 - Lyon, France
Duration: 7 Nov 201610 Nov 2016

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume10083 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference18th International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2016
Country/TerritoryFrance
CityLyon
Period7/11/1610/11/16

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