Realizing network slicing inside and between Autonomous Systems (ASs), that is, multi-domain, is challenging because there is no consensus or solutions that consider both policy and technological independence between domains. Many approaches found in the literature aimed to realize network slices that span across multiple ASs. However, they commonly rely on cross-connected technologies or domain-coupled such as Virtual Private Network (VPN) or Multi-Protocol Label Switching (MPLS). This work addresses the issue of multi-domain network slicing by leveraging technologies such as Software-defined Networking (SDN), Segment Routing (SR), and Network Functions Virtualization (NFV) in an innovative distributed framework, called Network And Slice ORchestrator (NASOR). Our work advances resource management and orchestration potentialities, providing a recursive network slice mechanism and adding dynamism in the network slice deployment between multiple domains through an open interface. As a result, NASOR functionally outperforms its peers. Experiments showcased the proposal’s applicability and scalability in multi-domain network slicing. Additionally, experiments suggest that an open interface enhances network slices’ customization degree and improves the network Quality of Service (QoS) in typical Internet applications, such as Voice over Internet Protocol (VoIP).

实现自治系统 (AS) 内部和之间的网络切片，即多域，具有挑战性，因为没有考虑域之间的策略和技术独立性的共识或解决方案。文献中发现的许多方法旨在实现跨越多个 AS 的网络切片。但是，它们通常依赖于交叉连接技术或域耦合技术，例如虚拟专用网 (VPN) 或多协议标签交换 (MPLS)。这项工作通过在称为 Network And Slice ORchestrator (NASOR) 的创新分布式框架中利用软件定义网络 (SDN)、分段路由 (SR) 和网络功能虚拟化 (NFV) 等技术来解决多域网络切片问题）。我们的工作提高了资源管理和编排潜力，提供递归网络切片机制，通过开放接口为多域之间的网络切片部署增添活力。因此，NASOR 在功能上优于同行。实验展示了该提议在多域网络切片中的适用性和可扩展性。此外，实验表明，开放接口提高了网络切片的定制化程度，提高了典型互联网应用中的网络服务质量（QoS），如互联网协议语音（VoIP）。