A reliable Wide Area Network (WAN) has become a necessity for enterprises to transmit critical data between multiple branches and to increase their revenues. Many solutions and different network structures have been proposed over years such as leased lines, Frame Relay or Multi-Protocol Label Switching Virtual Private Networks (MPLS VPN). Each solution is intended to be better than its predecessors in terms of reliability and Quality of Service (QoS). Software-Defined Wide Area Networking (SD-WAN) is an emerging paradigm that introduces the advantages of Software Defined Networking (SDN) into enterprise networking. SD-WAN can support differentiated services over public WAN by dynamically changing the flow forwarding rules over an overlay network built on different underlay physical connections. Thanks to these capabilities, it is possible to overcome high cost of guaranteed QoS services such as MPLS. In this thesis, we present a theoretical model which is able to compute the performance of an SD-WAN solution in terms of architecture, service availability and protection. Starting from a basic enterprise network scenario, we investigated the entire set of parameters that come into play when developing an SD-WAN solution. By changing those parameters, we evaluated the achievable performance in terms of delay and packet loss of different emulated enterprise services. Moreover, we implemented a real testbed scenario using a commercial SD-WAN solution by connecting two sites of an enterprise with low-cost Public Internet connections provided by different Internet Service Provider. Experimental results show the capability of commercial solution to react to network impairments, steering traffic among the two connection.
Una rete Wide Area Network (WAN) è diventata una necessità per le aziende per trasmettere dati critici tra le loro sedi e per incrementare i loro ricavi. Molte soluzioni e strutture di reti differenti sono state presentate nel corso degli anni come linee dedicate, Frame Relay o Multi-Protocol Label Switching Private Network (MPLS VPN). Ogni soluzione è intesa a migliorare la precedente in termini di affidabilità e Quality of Service (QoS). Software-Defined Wide Area Networking (SD-WAN) è un paradigma emergente che introduce i vantaggi del Software Defined Networking(SDN) nelle reti aziendali. SD-WAN può supportare servizi differenziati sulla WAN pubblica cambiando dinamicamente le regole di inoltro del flusso su una rete overlay costruita sopra connessioni fisiche differenti. Grazie a queste funzionalità, è possibile superare gli alti costi dei servizi privati come MPLS. In questa tesi, presentiamo un modello teorico che è in grado di calcolare le performance di una soluzione SD-WAN in termini di architettura, disponibilità del servizio e protezione. Partendo da uno scenario aziendale di base, abbiamo esaminato l’intero insieme di parametri che entrano in gioco quando si sviluppa una soluzione SD-WAN. Cambiando questi parametri, valutiamo le performance raggiungibili in termini di ritardo e perdita pacchetti di differenti servizi aziendali simulati. Inoltre, abbiamo implementato un testbed in uno scenario reale usando una soluzione commerciale, connettendo due siti di un’azienda con connessioni internet a basso costo fornite da operatori differenti. I risultati sperimentali mostrano la capacità della soluzione commerciale a reagire ai problemi di rete, instradando il traffico tra le due connessioni.
SD-WAN modeling and performance evaluation in a full-scale testbed
TAGLIAVINI, LUIGI
2018/2019
Abstract
A reliable Wide Area Network (WAN) has become a necessity for enterprises to transmit critical data between multiple branches and to increase their revenues. Many solutions and different network structures have been proposed over years such as leased lines, Frame Relay or Multi-Protocol Label Switching Virtual Private Networks (MPLS VPN). Each solution is intended to be better than its predecessors in terms of reliability and Quality of Service (QoS). Software-Defined Wide Area Networking (SD-WAN) is an emerging paradigm that introduces the advantages of Software Defined Networking (SDN) into enterprise networking. SD-WAN can support differentiated services over public WAN by dynamically changing the flow forwarding rules over an overlay network built on different underlay physical connections. Thanks to these capabilities, it is possible to overcome high cost of guaranteed QoS services such as MPLS. In this thesis, we present a theoretical model which is able to compute the performance of an SD-WAN solution in terms of architecture, service availability and protection. Starting from a basic enterprise network scenario, we investigated the entire set of parameters that come into play when developing an SD-WAN solution. By changing those parameters, we evaluated the achievable performance in terms of delay and packet loss of different emulated enterprise services. Moreover, we implemented a real testbed scenario using a commercial SD-WAN solution by connecting two sites of an enterprise with low-cost Public Internet connections provided by different Internet Service Provider. Experimental results show the capability of commercial solution to react to network impairments, steering traffic among the two connection.| File | Dimensione | Formato | |
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2020_06_Tagliavini.pdf
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Descrizione: Testo della tesi
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https://hdl.handle.net/10589/154434