VPN creation in IP/MPLS Network in Kosova Besnik Shatri,Agim Abdullahu, Skënder Rugova,Arianit Maraj Department of Telecommunication University of Prishtina Faculty of Electrical and Computer Engineering “Bregu i Diellit, p.n”, PRISHTINA-KOSOVA besnik_shatri@yahoo.com ,agim.abdullahu@ptkonline.com , skender.rugova@ptkonline.com,arianit.maraj@ptkonline.com Abstract This paper treats a MPLS VPN implementation in a network, which was initially configured for fulfilling the demands for mainly voice and ADSL services. At the beginning, the architecture of TK (Telecom of Kosova) NGN network with its corresponding elements and functionality is described. Then, based on business customers’ demands, the reconfiguration of MPLS VPN in a full mesh LSP form is presented. The standardized methodology used for creation of new services was of great support for fast provision of those services. This experience has demonstrated all the advantages of a network based MPLS VPN approach in a full mesh LSP network. At the end, the example of the full mesh LSP network topology configuration is presented. Currently, the established network is used to offer VPN services to a bank located in 4 different towns in Kosova, and later for the other customers with the similar demands. Key words: MPLS, ADSL, VPN, NGN, LSP, QoS 1. Introduction Telecom of Kosova (TK) is an incumbent fix telecommunications service provider. In its efforts to keep the leading position in Kosova’s competitive telecommunication market, TK is implementing its technological development strategy and migration to full IP NGN network. The standard-based open architecture network is paving the way for the integration of Voice and Multimedia on a single network infrastructure, providing increased functionality, customization and reduced unit costs. The all IP network will enable TK to have a strong focus on customer needs and the development of new services supported by a broadband access network and an IP core. In the first phase of exploitation, NGN network’s duty was to enable the migration of existing PSTN customers in a modern system, which offers a better QoS, better provisioning and service monitoring and customer support. It also enables the creation of potential for new voice customers in TK. In this phase the network topology is also adjusted for providing ADSL services. In this context three VPN networks have been created in a star topology. This concept of the network that is applicable for voice, ADSL and network monitoring demands, has not been proven as optimal for offering VPN services for business customers. In order to fulfill the new customers’ needs and based on TK staff experience in network operation, a full mesh LSP network is configured in a very short time. This configuration is shown to be a very suitable solution for offering these services in an effective way, fully satisfying very strict time to market demands. The applied configuration enables an easy change of service performances and quick access of new customers with fully respecting security and QoS. 2. MPLS The use of MPLS is more efficient way of traffic engineering/transporting compared to standard routing in IP networks [1]. The main characteristic of MPLS is packet forwarding by label exchanging or label switching. Label is an identifier that tells routers how to do packet forwarding from the source to the destination. Packets follow a predetermined path - LSP (Label switch path) in a MPLS tunnel. Signaling protocols RSVP-TE and LDP can be used for Seventh International Conference on Networking 978-0-7695-3106-9/08 $25.00 © 2008 IEEE DOI 10.1109/ICN.2008.122 318 Seventh International Conference on Networking 978-0-7695-3106-9/08 $25.00 © 2008 IEEE DOI 10.1109/ICN.2008.122 318