NSD Requirements:
1, VFC project requirement
2, NSD vs ServiceD differences:
Service Descriptor in SDC R3: Service composites many resources in the SDC, including SDC AID resources(vf, extVL, AllottedResource) and R2+ resources.
NSD in VFC: NSD composites VNFD, PNFD, and NSVirtualLink, nested NSD, etc, ETSI NFV resources.
NSD requires to do some limitation in NFV resources composition, not all the SDC resources and substitution_mappings to NS TOSCA node
NSD related work pages:
ONAP R2+ Design-Time Service DM Input.
Network Service Descriptor Model - Based on R2
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