Propuesta de marco para acelerar la adopción de SDN en proveedores de servicio

Abstract

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Escuela Politécnica Superior, Departamento de Tecnología Electrónica y de las Comunicaciones. Fecha de Lectura: 28-04-2023This PhD thesis focuses on the investigation, design and evaluation of a reference architecture for the adoption of SDN in service provider networks. For this purpose, a hierarchical orchestrator Software Defined Transport Network Controller (SDTN), responsible for the control and management of the endto- end transport network across multiple domains, has been included. The SDTN will be the single entry point to the network and will interact with the Operational Support and Business Support Systems through standard interfaces to provide the necessary transport network services. This architecture has been tested with various scenarios and typical services to test its usefulness for current and future requirements. This work includes an explanation of the network automation initiatives available in the literature and contains a description of the set of key concepts to properly explain software-defined networking and its direct relationship to network slicing. It also includes definitions of the standard protocols, service models, network models and device models used in this work. It includes a subsection of some relevant carrier tests. Based on the structure of the enhanced Telecom Operations Map (eTOM) framework defined by the TMForum, the proposed architecture for implementing and operating the service lifecycle (Service Management and Operation) is presented. The services evaluated were Layer 3 and Layer 2 Virtual Private Networks; in both cases, the implemented YANG models are presented, and the designed provisioning flows was executed and evaluated in concept tests carried out in Telef´onica Colombia and Spain. In an evaluation of future services, an analysis of the proposed architecture is included to allow the “Network Slices” management. To evaluate this, the results of a Network Slicing concept test performed in Telef´onica Spain are presented. The provisioning of each Slice included the announcement of more than 5000 BGP prefixes between network endpoints, service restoration and service deletion. Additionally, it proposes, designs and evaluates the flow for the correct entry of a new device to the operator’s network without human intervention. The Zero touch provision validates the complete installation of a network operating system (NOS) and an updated configuration on a device. The devices used were CASINI white boxes in combination with two well-known protocols such as DHCP and FTP. The main results of this work include the publication of papers in peerreviewed international journals, the presentation of papers at high impact international conferences and work published in standardization bodies such as Internet Engineering Task Force (IETF) or public technical documents such as the Telecom Infraproject specification