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### A Sample Service using the Sample VNF ###
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topology_template:
  node_templates:
    vnf_1:
      type: com.vendorxxx.SampleVNF
      properties:
        num_of_instances_inside: 13
      requirements:  # infrastructure requirements, to be satisfied by the orchestrator
        - compute_1:
            capabilities: onap.capabilities.Compute
        - storage_1:
            capabilities: onap.capabilities.Storage

Points to emphasize:

1. Scaling expressed through policies
2. Affinity/anti-affinity expressed through policies
3. VDU node type to model a virtual container (VM, Docker container):
   1. States quantified requirements for infrastructure: 
      1. Generic requirements: computational power, storage volumes, 
      2. Requirements for specific hardware: Intel’s, AMD, etc.
   2. Includes a software image used to initialize the container - as a TOSCA artifact
   3. In order to specify hardware/infrastructure requirements for a resource, the designer creates a VDU node in the topology template and then creates a relationship between the resource node and the VDU node using the tosca.capabilities.Container capability-requirement pair; multiple resources may share a VDU
   4. The requirements for hardware/infrastructure specified by the VDU nodes across the model will be satisfied on instantiation by the orchestrator.
4. The VNFD element of the Information Model is modelled through a combination of the following TOSCA constructs:
   1. A TOSCA node type – the “interface” part of the definition: derived from the onap.nodes.VNF node type (and, consequently, from the basic onap.nodes.Resource); exposes the important properties, capabilities, requirements
   2. A TOSCA topology template – the “implementation” part of the definition: the internal topology of component resources and policies
   3. A TOSCA substitution mapping construct that wires the interface to the implementation: interface properties are mapped to the implementation topology inputs, interface capabilities and requirements – to those of the component resource nodes
5. An occurrence of the VNF in a higher-level topology (a service or a “higher” VNF) is modelled as a TOSCA node template of the VNFD “interface” node type, with its properties populated and requirements and capabilities involved into relationships with the neighbor nodes.

See also: Scaling