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Modeling Control Traffic in Distributed Software Defined Networks
KTH, School of Electrical Engineering (EES).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Software defined networks (SDNs) have evolved as novel network architecture in modern networking. However, to allow SDN scale for several thousand switches, the control architecture needs to be distributed, with control traffic between switches and controllers, as well as among the controllers. The aim of this master thesis is to develop a mathematical model of the control traffic in this emerging distributed SDN. The work includes the evaluation of the increase in control traffic with the size of the network and the effect of the network topology on the scaling of the control traffic, and the investigation of the benefits of optimizing the number of controllers.

Mathematical model of inter-controller traffic and switch to controller traffic has been developed based on previous measurement works on SDN control protocols. This model has been applied to two basic network topologies and the results have been compared. Our model depicts that a random network which exhibit small world property has much lower traffic than regular topologies, and that by optimizing the cluster size the control traffic can be reduced from several Exabits/s to a few Pbits/s.

Abstract [sv]

Software Defined Nätverk (SDNs) har utvecklats som nya nätverksarkitektur i modern nätverksutveckling . Men för att möjliggöra att SDN skalas för flera tusen switchar, måste kontrollarkitekturen vara distribuerad, med kontroll trafik mellan switchar och kontrollerna, liksom bland kontrollerna. Syftet med detta examensarbete är att utveckla en matematisk modell av styrtrafiken i denna nya distribuerade SDN. Arbetet omfattar utvärdering av den ökade kontroll trafik med nätverk storleken och nätverkstopologins effekt på skalningen av styrtrafiken, och undersökningen av fördelarna med att optimera kontrollernas antal.

Matematisk modell av inter-kontroller trafiken och switch till kontroller trafiken har utvecklats baserat på tidigare mätning på SDN kontrollprotokoll. Denna modell har tillämpats på två grundläggande nätverkstopologier och resultaten har jämförts. Vår modell visar att en slumpmässig nätverkstopologi som uppvisar ”small world” egenskaper har mycket lägre trafik än regelmässiga topologier, och att genom att optimera kluster storleken kan styrtrafiken minskas från flera Exabits/s till några Pbits/s.

Place, publisher, year, edition, pages
2016. , 61 p.
Series
EES Examensarbete / Master Thesis, TRITA EE 2016:107
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-194200OAI: oai:DiVA.org:kth-194200DiVA: diva2:1038710
Examiners
Available from: 2016-10-19 Created: 2016-10-19 Last updated: 2016-11-15Bibliographically approved

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