The world has emerged as a global village. Internet has brought an amazing change in the era of modern communications. Demand for multimedia applications and an ever increasing amount of VoIP traffic have increased data rate and bandwidth requirements. It has become a big chal-lenge to provide best quality applications. Traffic engineers are working hard over Internet Protocol (IP) and Routing Protocols (RPs) in order to cope with this challenge. IP networks have offered these services efficiently until now, but there are several issues with IP routing that affect the Quality of Service (QoS). Multi-Protocol Label Switching (MPLS) has emerged as an agile technology which promises effective security together with high speed data delivery. MPLS networks use switching instead of conventional routing. MPLS doesn’t replace existing IP networks, but guarantees instead better QoS in existing IP networks as well as future routing technologies, providing thus a suitable environment for Traffic Engineering (TE). The Class of Service (CoS) architecture provided by MPLS can easily be coordinated with IP QoS mecha-nisms. Traffic can be switched based on resource utilization and network performance instead of using static routing techniques such as selecting a path with least cost, optimizing thus the MPLS network for heavy application at desired quality. / Världen har blivit en global by. Internet har inneburit en fantastisk förändring i en tid präglad av modern kommunikation. Efterfrågan på multimediaapplikationer och en allt större mängd VoIP-trafik har ökat datahastighet och krav på bandbredd. Det har blivit en stor utmaning att ge bästa kvalitet ansökningar. Trafiken tekniker arbetar hårt over Internet Protocol (IP) och routingprotokoll (RPS) för att klara av denna utmaning. IP-nät har erbjudit dessa tjänster på ett effektivt fram tills nu, men det finns flera problem med IP-routing som påverkar Quality of Service (QoS). Multi-Protocol Label Switching (MPLS) har utvecklats till en flexibel teknik som utlovar effektiv säkerhet tillsammans med hög hastighet leverans. MPLS-nätverk används byte istället för konventionella routing. MPLS ersätter inte de befintliga IP-nät, utan garantier i stället bättre QoS i befintliga IP-nät samt framtida routing-teknik, vilket har en lämplig miljö för trafikteknik (TE). Den klass som (COS) arkitektur som MPLS kan enkelt styras med IP QoS meka-nismer. Trafiken kan kopplas grundas på resursutnyttjande och nätverksprestanda istället för att använda statisk routing tekniker som att välja en väg med lägsta kostnad, vilket optimerar därmed MPLS nät för tunga ansökan till önskad kvalitet.

Multi-Protocol Label Switching (MPLS) is a technique that can be used to improve the performance of a computer communication network. By use of MPLS, data packets can be switched on the basis of labels rather than routed on the basis of destination address. MPLS supports different features like QoS, traffic engineering and VPNs etc. This thesis evaluates the working and performance of MPLS and its support for Quality of Service. QoS is required in the network when real time traffic is transported. In this thesis it is described, how QoS guarantees are assigned to the IP packets and how MPLS QoS environment differs from the traditional IP routing environment. MPLS QoS works as the IP QoS, but MPLS QoS enhances the capability of network as compared to the IP QoS based network. The thesis studies the use of MPLS in an integrated environment with DiffServ QoS model and also implements MPLS QoS in a Lab environment to compare MPLS QoS with IP QoS. Real time traffic faces longer delays in IP QoS based networks. MPLS QoS reduces the delays in real time traffic transmission. The study results and the practical implementations show that MPLS QoS provide much better results than simple IP QoS.

Currently, a viable solution to provide multicast provision over a multiprotocol label switch with traffic engineering (MPLS-TE) domain is unavailable because of the missing link able to couple multicast traffic distribution with an MPLS-TE enabled network. This is due to the limited or less research investigation that was done in this area. Most of the investigation methods tackle the problem individually such as deploying internet protocol (IP) multicast in a plain network or MPLS domain but without considering a combination of both technologies that is aware of differentiated services requirements. This thesis presents an alternative solution for the multicast differentiated services provision problem over a MPLS-TE enabled network. The approach is exposed and analyzed through a practical solution that was developed within a network simulation environment. The research presented in this thesis orchestrates the already available technologies offered by the multicast protocols suite and differentiated services (DiffServ) aware MPLS-TE that allows applying separately the constraint-based routing and admission control to different classes of services. The novelty and solution of this thesis relies on using MPLS constraint-based routing concepts (e.g.traffic trunks) in order to solve TE issues revealed during multicast traffic distribution.

In the introduction of this thesis the reasons for transition from older to a new technology called MultiProtocol Label Switching are mentioned – the modern technology enables simple network extension. The theoretical part contains basic principles of this techno- logy and their practical application for supplying private networks to the customers using provider’s network. In practical part packets are analyzed considering the theory. In addi- tion. All the technologies tested on a real network. Experience gained while working on this thesis are assessed during creating laboratory task for class Architecture of Networks intended for students of Bachelor’s study programme.

No description available.

This thesis proposes a multi-protocol label switching (MPLS)-based architecture to provide quality of service (QoS) for both internet service provider (ISP) networks and backbone Internet Protocol (IP) networks that are heterogeneous in nature. Heterogeneous networks are present due to the use of different link-layer mechanisms in the current Internet. Copper-based links, fiber-based links, and wireless links are some examples of different physical media that lead to different link-layer mechanisms. The proposed architecture uses generalized MPLS and other MPLS features to combat heterogeneity. The proposed architecture leverages the QoS capabilities of asynchronous transfer mode (ATM) and the scalability advantages of the IP differentiated services (DiffServ) architecture. This architecture is constructed in such a way that MPLS interacts with DiffServ in the backbone networks while performing ATM-like QoS enforcement in the periphery of the networks. The architecture supports traffic engineering through MPLS explicit paths. MPLS network management, bandwidth broker capabilities, and customizability is handled through domain specific MPLS management entities that use the Common Open Policy Service (COPS) protocol to interact with other MPLS entities like MPLS label switch routers and label edge routers. The thesis provides a description of MPLS and QoS, followed by a discussion of the motivation for a new architecture. The MPLS-based architecture is then discussed and compared against similar architectures. To integrate the ATM and DiffServ QoS attributes into this architecture, MPLS signaling protocols are used. There are two common MPLS signaling protocols. They are Resource Reservation Protocol with traffic engineering extensions (RSVP-TE) and Constraint-Routed Label Distribution Protocol (CR-LDP). Both these protocols offer comparative MPLS features for constraint routed label switch path construction, maintenance, and termination. RSVP-TE uses UDP and IP, while CR-LDP uses TCP. This architecture proposes a multi-level domain of operation where CR-LDP operates in internet service provider (ISP) networks and RSVP- TE operates in backbone networks along with DiffServ. Qualitative analysis for this choice of domain of operation of the signaling protocols is then presented. Quantitative analysis through simulation demonstrates the advantages of combining DiffServ and MPLS in the backbone. The simulation setup compares the network performance in handling mixed ill-behaved and well-behaved traffic in the same link, with different levels of DiffServ and MPLS integration in the network. The simulation results demonstrate the advantages of integrating the QoS features of DiffServ, ATM functionality, and MPLS into a single architecture. / Master of Science

Made available in DSpace on 2016-04-04T18:31:20Z (GMT). No. of bitstreams: 1 Alberto Lotito.pdf: 2153365 bytes, checksum: 3433c9bb5371bcce62f119c4593fe360 (MD5) Previous issue date: 2007-12-05 / This work intends to perform end-to-end traffic engineering through simulations in broadband multiprotocol networks and evaluate used parameters. We ve proposed and tested parameters used by the network administrator to dimension the action of an algorithm for Traffic Engineering. We dedicated special attention to IP networks interconnected to MPLS networks. Through simulations, we ve addressed questions of performance optimization, evaluating the network packet losses and compare the results with packet loss in the traditional OSPF network achieving improvements of up to 50%. This work contributes with improvements in traffic performance for real world networks, developing practical application since the traditional IP networks up to the present MPLS networks and also for mixed technologies. / Este trabalho tem como objetivos realizar simula??es de engenharia de tr?fego fim a fim em redes que trabalham com protocolos distintos e avaliar par?metros usados. Propusemos e testamos par?metros que servem para que o operador da rede dimensione a atua??o de um algoritmo para engenharia de tr?fego. Demos especial aten??o ?s redes que trabalham com IP interconectando-se a redes MPLS. Executando diversas simula??es, trabalhamos quest?es de melhoria de desempenho por meio de avalia??o da perda de pacotes nas redes testadas comparando-se os resultados com as tradicionais redes com protocolo OSPF e chegando a melhoria de at? 50% se comparado com este. Este trabalho contribui com melhorias em engenharia de tr?fego em redes do mundo real, desenvolvendo aplica??o pr?tica desde as tradicionais redes IP at? as atuais redes MPLS e tamb?m em redes de tecnologias mistas.

The MultiProtocol Label Switching (MPLS) framework is used in many networks to provide efficient load balancing which distributes the traffic for efficient Quality of Service (QoS) provisioning in the network. If the MPLS framework is combined with Differentiated Services (DiffServ) architecture, together they can provide aggregate-based service differentiation and QoS. The combined use of DiffServ and MPLS in a network is called DiffServ-aware Traffic Engineering (DS-TE). Such DiffServ-based MPLS networks demand development of efficient methods for QoS provisioning. In this thesis, an automated manager for management of these DiffServ-based MPLS networks is proposed. This manager, called Traffic Engineering Automated Manager (TEAM), is a centralized authority for adaptively managing a DiffServ/MPLS domain and it is responsible for dynamic bandwidth and route management. TEAM is designed to provide a novel and unique architecture capable of managing large scale MPLS/DiffServ domains without any human interference. TEAM constantly monitors the network state and reconfigures the network for efficient handling of network events. Under the umbrella of TEAM, new schemes for Label Switched Path (LSP) setup/teardown, traffic routing, and network measurement are proposed and evaluated through simulations. Also, extensions to include Generalized MPLS (GMPLS) networks and inter-domain management are proposed.

MPLS-Based Best-Effort Traffic Engineering Jerapong Rojanarowan 120 Pages Directed by Dr. Henry L. Owen The objective of this research is to develop a multipath traffic engineering framework for best-effort traffic in Multiprotocol Label Switching (MPLS) networks so as to deliver more equal shares of bandwidth to best-effort users as compared to the traditional shortest-path algorithm. The proposed framework is static and the input to the traffic engineering algorithm is restricted to network topology. Performance evaluation of this framework is conducted by simulation using ns-2 network simulator. In a multi-service capable network, some portion of the bandwidth is reserved for guaranteed services and the leftover portion is dedicated to best-effort service. This research examines the problem of traffic engineering for the remaining network bandwidth that is utilized by best-effort traffic where demands are not known a priori. This framework will result in making the limited available best-effort traffic bandwidth more equitably shared by the best-effort flows over a wide range of demands. Traditional traffic engineering research has not examined best-effort traffic.

Multi Protocol Label Switching (MPLS) är en routingteknik som blir allt vanligare i dagens nätverk. Vid implementation av MPLS i nätverk är det grundläggande att hårdvaran har tillräckligt hög prestanda för att hantera tekniken. Om så inte är fallet kan det leda till negativa konsekvenser såsom paketförluster eller i värsta fall att routern havererar. Syftet med arbetet var att ta reda på hur processorbelastningen på en router skiljer sig när MPLS var implementerat jämfört med traditionell IP-routing. Routingprotokollen BGP, OSPF och RIP användes tillsammans med de olika routingteknikerna för att se vilket av dessa som krävde minst processorkraft. För att ta reda på hur processorbelastningen påverkades skapades en experimentmiljö. Varje routingprotokoll konfigurerades tillsammans med MPLS respektive traditionell IP-routing, vilket gav oss sex olika scenarion. Trafik skickades sedan genom nätverket med hjälp av applikationen Ostinato för att belasta enheterna. Resultatet av testerna visade att processorbelastningen blev högre för MPLS än för traditionell IP-routing. Det gällde för samtliga routingprotokoll. Det routingprotokoll som tillsammans med MPLS lyckades hålla processorbealstningen lägst var BGP, medans OSPF orsakade högst processorbelastning. Skillnaden mellan routingprotokollen OSPF och RIP var marginell. / Multi Protocol Label Switching (MPLS) is a growing routing technology. It is getting more common in today’s modern networks. When implementing MPLS, it is essential that the hardware is capable of handling such technology. If not, this could lead to packet loss or even network outage. The purpose of this study was to examine differences between MPLS and traditional IP-routing in aspect of CPU utilization. Routing protocols BGP, OSPF and RIP were configured together with the technologies in order to see which of the mentioned routing protocols that was the most efficient in terms of CPU utilization. An environment was created for the experiment. Each routing protocol was configured together with MPLS and traditional IP-routing respectively, which lead to a total of six scenarios. Traffic was sent through the network with an application called Ostinato with the purpose of increasing the load of the devices. The results showed higher CPU utilization with MPLS compared to traditional IP-routing. This was the case with each routing protocol. BGP had the lowest CPU utilization of the routing protocols in conjunction with MPLS whilst OSPF had the highest. The result between OSPF and RIP was slightly different.