Service Function Chaining (SFC) has gained momentum as one of the building blocks of the 5G ecosystem. Indeed, SFC combined with other promising technologies such as Software Defined Networking (SDN) as well as Network Slicing form the basis for enabling the 5G network services and fulfilling their requirements. Many contributions have been made to support and enforce SFC, from chain composition to its deployment and life-cycle management. However, few research works study SFC orchestration, and even fewer consider the multi-domain context, which remains an open issue with many challenges that need to be tackled in order to provide end-to-end services. In this paper, we contribute to filling this gap by introducing a novel architecture for orchestrating and enforcing multi-domain SFCs. The proposed architecture leverages on the ETSI MANO standard, as well as SDN and the hierarchical SFC principles, and is agnostic to the packet forwarding technology used by each administrative domain. We also implement a Proof of Concept (PoC) that employs different SFC encapsulation types to evaluate the architecture, where the obtained results prove our architecture’s efficiency, we are also able to draw conclusions related to the encapsulation methods to implement. Finally, we discuss open research issues.

服务功能链（SFC）已成为5G生态系统的组成部分之一。实际上，SFC与诸如软件定义网络（SDN）以及网络切片之类的其他有前途的技术相结合，构成了启用5G网络服务并满足其要求的基础。从链组成到其部署和生命周期管理，为支持和执行SFC做出了许多贡献。但是，研究SFC流程的研究很少，而考虑多域环境的研究则更少，这仍然是一个开放的问题，要提供端到端服务，还需要解决许多挑战。在本文中，我们通过引入一种新颖的架构来协调和执行多域SFC，为填补这一空白做出了贡献。拟议的架构利用了ETSI MANO标准，以及SDN和分层SFC原理，并且与每个管理域使用的数据包转发技术无关。我们还实现了概念验证（PoC），该概念采用不同的SFC封装类型来评估体系结构，其中获得的结果证明了我们的体系结构的效率，我们还能够得出与要实现的封装方法有关的结论。最后，我们讨论开放研究问题。我们还能够得出与要实施的封装方法有关的结论。最后，我们讨论开放研究问题。我们还能够得出与要实施的封装方法有关的结论。最后，我们讨论开放研究问题。