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Nydesign av kommunalt corenät
University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Redesign of a municipal core network (English)
Abstract [sv]

Detta examensarbete behandlar ett antal problem som Uddevalla kommun har i sitt corenät. Nätverket är idag uppbyggt på enbart lager2-länkar och routingen är fördelad på ett antal för ändamålet dedikerade multilayerswitchar. Dessa switchar, vars enda uppgift är att routa, är konfigurerade med enbart statiska routes. Att fördela routingen på detta sätt innebär ineffektiva trafikflöden, vilket belastar länkar och nätverksenheter onödigt mycket. Då kommunen skall byta ut och uppgradera sitt corenät, arbetas det fram ett designförslag som löser dessa problem.

Framtagandet av designförslag för det nya corenätet har genomförts genom att i laborationsmiljö göra mätningar som jämför dagens distribuerade routinglösning med en lösning där routingen flyttas så nära källan som möjligt. Utifrån resultaten av dessa mätningar har ett designförslag arbetats fram för att optimera både routing och trafikflöden.

Det designförslag som tagits fram bygger på Ciscos hierarkiska modell, vilket är en modell som beskriver hur ett skalbart och redundant nätverk bör byggas. I denna modell delas nätverket in i de tre lagren; core, distribution och access. I förslaget effektiviseras routingen genom att den flyttas till distributionslagret. Detta medför även ett mer optimerat trafikflöde i nätverket. Vidare föreslås att routingprotokollet OSPF implementeras med fyra areor

Abstract [en]

This thesis is covering a couple of problems within the municipality of Uddevalla and their core network. Today the network consists entirely of layer-2 links and routing which is divided between three multilayer switches. These switches main purpose is routing. They are configured with all static routs. To divide the routing in such a way means suboptimal routing, which in turn encumbers all links and network devices unnecessary. Since it is time to upgrade and replace all key components within the core network, this project resulted in a solution witch solves these problems.

The design of the new core has been evolving through numerous tests in a lab environment, comparing two different types of routing. On one hand, todays model where the routing is distributed on a couple of different switches, and on the other, a routing solution where the routing is taking place as close to the source as possible. Through the results of these tests, a new design has been proposed to both optimizing the routing and the traffic flows within the network.

The new net design is built upon the Cisco hierarchy (hierarchical) model. It is a model which describes how a scalable and redundant network should be built. In this model, the network is divided into three logical layers; core, distribution and access. In this proposal, the routing is more effective due to the fact that is has been moved to the distribution layer. This change will also optimize the flow of traffic within the network. On top of it all, the dynamic routing protocol OSPF, which is divided in four different areas, is suggested to be implemented

Place, publisher, year, edition, pages
2014. , p. 12
Keywords [en]
Routing, core, network, OSPF, Cisco, router, switch
Keywords [sv]
Routing, core, nätverk, routingprotokoll, OSPF, Cisco, router, switch
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:hv:diva-6296Local ID: EXM301OAI: oai:DiVA.org:hv-6296DiVA, id: diva2:721791
Subject / course
Computer science
Educational program
Nätverksteknik med IT-säkerhet
Supervisors
Examiners
Available from: 2014-06-05 Created: 2014-06-05 Last updated: 2018-01-11Bibliographically approved

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