Multi-Technology Optical Resource Virtualization. The optical resource virtualization is an internal service of the COSIGN DCN Control Plane, which constitute the basic building block to enable all the functions and services that needs to operate the COSIGN DCN physical infrastructure. The objective of this first level of virtualization is to provide a complete set of functions to manipulate and monitor the multi-technology optical resources through a more abstract interface. This approach allows the internal components of the SDN controller to deal with the multi-technology DCN in an efficient and uniform way, managing virtual optical resources characterized by a common set of parameters instead of the physical resource variety. The relationship between physical and virtual resources may follow the 1:N model. A physical node or link is split in multiple virtual nodes or links, each of them with a disjoint subset of the original capabilities that characterized the corresponding physical resource. Another approach is to aggregate and abstract more physical devices in a single virtual resource. However, it should be noted that single optical resources are managed only at the DC provider level, i.e. internally at the SDN controller or through management APIs, but they are not exposed as single, configurable entities to the DC provider’s customers. This approach creates a sort of screen between the DCN infrastructure and the DC customers, preventing any data plane misconfigurations and guaranteeing the required level of isolation. Indeed, the final objective of the COSIGN control plane is to use the COSIGN optical data plane, enriched by multiple network technologies, to compose converged virtual optical network slices. These slices are the orchestrated entities that can be exposed to the different tenants, depending on the specific use case. At the resource virtualization level, the different optical technologies of the COSIGN data plane are abstracted with their key features and attributes defined in the information model and exposed to the control plane through an abstraction layer. The key challenge is the definition of an information model (i.e. resource characteristics and allowed operations) powerful enough to exploit all the unique features offered by the optical data plane, while maintaining an acceptable and manageable level of complexity. The granularities of different technologies will be abstracted in order to compose a virtual slice with end-to-end granularity matching to accommodate the service...
Multi-Technology Optical Resource Virtualization. The optical resource virtualization is an internal service of the COSIGN DCN Control Plane, which constitute the basic building block to enable all the functions and services that needs to operate the COSIGN DCN physical infrastructure. The objective of this first level of virtualization is to provide a complete set of functions to manipulate and monitor the multi-technology optical resources through a more abstract interface. This approach allows the internal components of the SDN controller to deal with the multi-technology DCN in an efficient and uniform way, managing virtual optical resources characterized by a common set of parameters instead of the physical resource variety. The relationship between physical and virtual resources may follow the 1:N model. A physical node or link is split in multiple virtual nodes or links, each of them with a disjoint subset of the original capabilities that characterized the corresponding physical resource. Another approach is to aggregate and abstract more physical devices in a single virtual resource. However, it should be noted that single optical resources are managed only at the DC provider level,
