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Resource model includes design time model (ResourceDesc) and run time model (ResourceInstance). Based on one ResourceDesc, zero or more ResourceInstance(s) can be instantiated.
“Resource” is a generalization of many objects, for example, VNF, PNF, entitlement, etc. In the above diagram, only VNF, PNF and ServiceVirtualLink (virtual link between NFs) are shown. More specifically,
- VnfDesc is derived from ResourceDesc, VnfInstance is derived from ResourceInstance. Based on one VnfDesc, zero or more VnfInstance(s) can be instantiated.
- PnfDesc is derived from ResourceDesc, PnfInstance is derived from ResourceInstance. One PnfDesc is used to describe one PnfInstance.
- SrvVlDesc is derived from ResourceDesc, SrvVlInstance is derived from ResourceInstance. Based on one SrvVlDesc, zero or more SrvVlInstance(s) can be instantiated.
VnfDesc can be composed of one or more VnfcDesc(s) and zero or more VnfVlDesc(s). Correspondingly, VnfInstance can be composed of zero or more VnfcInstance(s) and zero or more VlInstance(s). It should be noted that a VnfInstance comprises zero VnfcInstance is a special case that the VnfInstance object is created but not instantiated.
Based on one VnfVlDesc, zero or more VlInstance(s) can be instantiated. And Based on one VnfcDesc, zero or more VnfcInstance(s) can be instantiated.

VnfDesc General View Diagram

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NOTE: This diagram is a proposed model for the VnfDesc, mainly inspired by the model from ETSI IFA015. Not all elements in the VnfDesc are depicted.

VnfcDesc is composed of one or more DeploymentFlavor(s), one or more VnfcDesc(s), one or more VnfExtCpDesc(s) and zero or more VnfVlDesc(s).
DeploymentFlavor references VnfcDesc and VnfVlDesc.
VnfcDesc is composed of one VirtualComputeDesc, one or more VirtualStorageDesc(s), zero or more SwImageDesc(s) and one or more VnfcCpDesc(s).
A VirtualStorageDesc can reference a SwImageDesc.
A VnfExtCpDesc references to a VnfcCpDesc.
VnfcCpDesc can reference a VnfVlDesc.

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