White Papers

Understanding OPNFV

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Page 64 of 144

Understanding OPNFV 64 such as improvements to Nova, Vitrage, Congress, Neutron, TOSCA-Parser, Heat-Translator, and the introduction of DragonFlow and Tricircle into OpenStack as optional services. VIM Options Beyond OpenStack In addition to OpenStack, the Danube release has experimental support for a VIM based on Kubernetes, an open source container orchestration project. In the words of the official site: Kubernetes is an open source system for automating deployment, scaling, and management of containerized applications. It groups containers that make up an application into logical units for easy management and discovery. Kubernetes builds upon 15 years of experience of running production workloads at Google, combined with best-of-breed ideas and practices from the community. Kubernetes enables containerized VNFs to be used in NFV deployments. The use of Kubernetes in the Danube release does not include any SDN controller integration, nor is it integrated with any other NFV-centric project. However, we expect Kubernetes integration to deepen over subsequent releases. OPNFV OpenRetriever is one such project that aims to provide Kubernetes integration and testing for the Euphrates release. Software Defined Networking (SDN) Controller The SDN controller is a control plane that is responsible for programming physical and virtual networking elements. Before SDN, switches or routers were configured using routing protocols that did not allow fine grained control. SDN controllers have a northbound interface that connects with MANO and VIM components, and a southbound interface to physical and virtual networking switches and routers. While northbound interfaces have not been standardized, a variety of standards exist for the southbound interface, such as OpenFlow, OpFlex, Netconf, P4, ovsdb, and so on. SDN controllers are responsible for setting up overlay networks. An overlay network is a virtual network built on top of a physical network that connects virtual machines. These overlay networks can go through a router or a gateway to communicate with the external world. SDN controllers offer numerous benefits: ● The entire control plane is centralized for ease-of-management, though it can still be

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