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As we saw, the OpenDaylight platform (ODL) provides a flexible common platform underpinning a wide variety of applications and Use Cases. Some of the most common use cases are mentioned here.
ONAP
The SDN Controller (SDNC) and the Application Controller (APPC) components of ONAP are based on OpenDaylight.
Leveraging the common code base provided by Common Controller Software Development Kit (CCSDK), ONAP hasprovides two application level configuration and lifecycle management controller modules called ONAP SDN-C and ONAP App-C . These controllers manage the state of a single Resource (Network or Application). Both provide similar services (application level configuration using NetConf, Chef, Ansible, RestConf, etc.) and life cycle management functions (e.g. stop, resume, health check, etc.). The ONAP SDN-C has been used mainly for Layer1-3 network elements and the ONAP App-C is being used for Layer4-7 network functions. The ONAP SDN-C and the ONAP App-C components are extended from OpenDaylight controller framework.
The ONAP SDN-C leverages the model driven architecture in OpenDaylight. As illustrated , the ONAP SDN-C leverages the OpenDaylight framework composed of API handlers, operational and configuration trees, and network adapters for network device configurations. Within this framework, the ONAP Service Logic Interpreter (SLI) newly introduced provides an extensible scripting language to express service logic through the Directed Graph builder based on Node-Red . The service logic is written how network service parameters (e.g. L3VPN) given from the northbound API are mapped onto network device configuration parameters consumed by external SDN controllers attaching to the ONAP SDN-C.
External SDN controller
External SDN controller interfaces with the southbound interface of the ONAP SDN-C and is used to manage the Layer1-3 network devices in each network domain. Over the interface, the network configuration parameters extracted from the service logic are passed to the external SDN controllers. An OpenDaylight as an external SDN controller supports parameters for L3VPN, L2VPN, PCEP, NETCONF and more. The external OpenDyalight controller deploy the given configurations into the network devices.
Network Virtualization for Cloud and NFV
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