For audiovisual network operators, end-users satisfaction is a major issue. This is the case for TDF who operates a nationwide network in France whose main purpose is to carry Digital Terrestrial Television streams. Such audiovisual content is forwarded through multicast real-time streams which require continuity of service. Therefore, the main goal of this work is to define a new architecture to prevent impact during network healing time. The proposed architecture aims to use a pair of redundant multicast trees, and ensure their seamless resiliency. This architecture called “Seamless Multicast” takes advantage of the network-end equipment’s ability to receive and combine two identical streams, complete or not. The main contribution of this paper is the development and evaluation of an algorithm for the computation of a pair of multicast trees and the associated hitless deployment scheme. Implementation requires an Software-Defined Networking architecture, in which performance knowledge and bandwidth management are centralized in a controller. A proof of concept controller has been used for validation of the architecture’s global behaviour using a virtualized environment in multiple scenarios.

对于视听网络运营商而言，最终用户的满意度是一个主要问题。TDF就是这种情况，TDF在法国经营着一个全国性的网络，其主要目的是传送数字地面电视流。这种视听内容通过需要服务连续性的多播实时流转发。因此，这项工作的主要目标是定义一种新的架构，以防止网络修复期间的影响。提议的架构旨在使用一对冗余多播树，并确保它们的无缝弹性。这种称为“无缝多播”的架构利用了网络端设备接收和组合两个完全相同或不完整的相同流的能力。本文的主要贡献是开发和评估了用于计算一对多播树的算法以及相关的无中断部署方案。实施需要软件定义的网络架构，其中性能知识和带宽管理集中在控制器中。概念验证控制器已用于在多个场景中使用虚拟化环境验证架构的全局行为。