On Network Service Modeling in Softwarized Networks

The Software Defined Network (SDN) and Network Function Virtualization (NFV) architectures are composed of different functional blocks such as NFV Orchestrator, Virtualized Infrastructure Manager (VIM) and SDN controllers. These components are modeled as independent software with specific access, configuration, and management. They are connected mainly across of the Application Programming Interfaces (APIs) that each component provides. A critical challenge is an integration between these diverse components towards effectively deploy resource requirements, configuration parameters, management policies and performance metrics of network services. This integration is possible by definition of standard service modeling language. This work presents an overview of network service modeling on SDN/NFV domain, including the description and integration of modeling languages and template TOSCA, YANG and HOT. Besides, the paper compares two orchestration frameworks in term of service modeling. This paper serves as an initial point in the research about service modeling.