Network Functions Virtualization (NFV) promotes a paradigm shift in the core network, by enabling the execution of network functions on a virtualized software plane instead of on dedicated hardware. Despite its benefits, NFV introduces new challenges, of which we highlight those related to the deployment of virtualized network services. Current NFV deployment solutions (i.e., those for composition, embedding, and scheduling) are usually limited to optimize hard-coded criteria, and cannot be customized to address specific demands defined by both network operators and NFV-as-a-Service customers. In this paper, we present a customizable NFV deployment framework that allows multiple criteria and multiple objectives to be applied to service composition, embedding, and scheduling. We evaluate the proposed framework integrated to deployment solutions specified in the literature. A case study is presented for the customized deployment of a traffic control and security service, and demonstrates the flexibility and effectiveness of the proposed framework.

网络功能虚拟化（NFV）通过在虚拟化软件平面而不是专用硬件上执行网络功能来促进核心网络的范式转变。尽管有好处，NFV还是带来了新的挑战，其中我们重点介绍了与虚拟化网络服务的部署有关的挑战。当前的NFV部署解决方案（即用于组合，嵌入和计划的解决方案）通常仅限于优化硬编码标准，并且无法进行定制以满足网络运营商和NFV即服务客户定义的特定需求。在本文中，我们提出了一个可定制的NFV部署框架，该框架允许将多个条件和多个目标应用于服务组合，嵌入和调度。我们评估与文献中指定的部署解决方案集成的提议框架。案例研究介绍了流量控制和安全服务的定制部署，并演示了所提议框架的灵活性和有效性。