Proceedings of the International Conference on Computer and Communication Engineering 2008
May 13-15, 2008 Kuala Lumpur, Malaysia
Performance Analysis and the Study of the behavior of MPLS Protocols Md. Arifur Rahman1, Ahmedul Haque Kabir1, K. A. M. Lutfullah1, M. Zahedul Hassan2, M. R. Amin1 1 Department of Electronics and Communication Engineering, East West University, Mohakhali, Dhaka-1212, Bangladesh; firstname.lastname@example.org, email@example.com 2 Information and Communication Technology Cell, Bangladesh Atomic Energy Commission, Ramna, Dhaka-1000, Bangladesh; firstname.lastname@example.org Abstract MultiProtocol label switching (MPLS) is the new means to take care of the fastest growing communication network to enhance the speed, scalability and service provisioning capabilities. In order to optimize the use of transmission resources, MPLS carries differentiated services across the Internet through a virtual path capability between packet (label) switches. MPLS also has the capabilities to engineer traffic tunnels by avoiding congestion and utilizing all available bandwidth with an efficient manner. The core value of MPLS is followed by the comparison of MPLS network with the existing network and MPLS signaling protocols: Constrained based Label Distribution Protocol (CR-LDP), Resource Reservation Protocol (RSVP) and Traffic Extension RSVP (RSVP-TE) maintaining the Quality of Service (QoS) parameters and their performance analysis as well. In such context, a full comprehensive simulation environment is created for a conventional network and MPLS applied over that traditional network to evaluate the comparative performance of network traffic behavior and the functionalities of MPLS signaling protocols as well. Finally, the results are evaluated and analyzed, and their behaviors are shown by means of graphical manner. Keywords: Label Switching, MPLS, LDP, CR-LDP, RSVP, RSVP-TE, QoS, Network Simulator (NS2). I. 1. INTRODUCTION The key functionalities of Traffic Engineering (TE) are resource reservation, fault-tolerance and optimum Resources utilization. MultiProtocol Label Switching (MPLS) technology allows traffic engineering and enhances the performance of the existing protocols over the traditional IPv4 network [1, 2]. The central II. 2. TRAFFIC MANAGEMENT In this simulation, the default specifications for G.711 (64) codec has been considered , where bidirectional Constant Bit Rate (CBR), User Datagram Protocol (UDP) are used as Voice over IP services and idea of MPLS is to attach a short fixed-length label to packets at the ingress router of the MPLS domain. Packet forwarding then depends on the tagged label, not on longest address match, as in traditional IP forwarding. A router placed on the edge of the MPLS domain, named Label Edge Router (LER) that is associated to a label on the basis of a Forwarding Equivalence Class (FEC). In the MPLS network, internal routers that perform swapping and label-based packet forwarding are called Label Switching Routers (LSRs) . Since MPLS by itself cannot provide service differentiation, combination of DiffServ with MPLS architectures seems to be a useful solution to provide QoS to multimedia traffic while effectively using network resources. The result of this integration is the DiffServ-aware Traffic Engineering (DS-TE). In order to enable DS-TE functionalities, DiffServ, MPLS and TE-related information have to be exchanged among routers through the control plane by means of a dynamic signaling protocol. Three signaling protocols are used in MPLS networks: (i).Label Distribution Protocol (LDP) , (ii).Constraint based Routing LDP (CR-LDP)  and (iii).Resource Reservation Protocol – Traffic Engineering (RSVP-TE) [1, 6]. The focus of the paper is on the comparative performance analysis between conventional and MPLS network. This paper is organized as follows. Section 2 describes the Traffic management. The simulation arrangements based on topology, traffic pattern and...
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