NST Selection

Interface details (data flow)

1) Select NST request comes from SO to OOF. The request will contain the service profile

2) OOF accepts the request & sends a synchronous response to SO

3) OOF Calls Policy to fetch the policies needed for NST selection

4) Policy returns the relevant policies to OOF

5) OOF calls AAI to fetch only the NSTs information. 

6) AAI returns all the NST's metadata in the response. 

GET  /aai/v19/service-design-and-creation/models/?role=NST&depth=2

From the metadata, we can get the model name and model version

7) For every NST, OOF will call SDC to download the corresponding CSAR artifact (The URL to download the CSAR will be formed by the metadata (model name & model version) info fetched from AAI)

GET /sdc/v1/catalog/services/{serviceModelName}/{serviceVersion}/artifacts/{artifactName}

service version is the model version (received from AAI)

artifact name is service-<model-name>-csar.csar

8) SDC returns the CSAR for the request NST model

9) OOF processes every CSAR to find the best suitable template and returns an asynchronous response to SO

In the CSAR Definitions/service-<model-name>-template-interface.yml template is the one which has to be compared with the service profile

Actions

• Update Existing API for NST selection
• Define Optimization policy models
• Add examples for consuming apis (AAI and SDC)
• OOF internal flows for NST selection

NSI Selection 

Interface details (data flow)

Prerequisite: NSMF gathers all the NSSMF capabilities from the corresponding NSSMFs

Step 1 - 5 is already captured in the previous flow

6a. NSI selection request. NSMF requests OOF for a suitable NSI/set of slice profiles

• Data: NST info with its constituent NSSTs, Service profile, NSSMF capabilities, Weightage

7. Get Optimization policies for NSI selection

• Policies for demand (NSI)
• Policies for Constraints (Threshold, etc.,)
• Policies for Optimization

8. Get the candidate NSIs from AAI

• Existing API in AAI
• Request: NST model info (model UUID)
• Response: List of NSI info
• Example:

9. Select suitable NSI or set of slice profiles based on optimization

• HAS run the optimization and selects the best solution
• Detailed flow with OSDF and conductor has to be worked out

6b. NSI selection Response

• Selected NSI/Set of Slice profiles

Actions

• Update to existing NSI selection API. API specifications have to be worked out (Step 6)
• Define Optimization policy models (Step 7)
• Add an example to consumed AAI API (Step 8)
• OOF internal flow for NSI selection and slice profile generation (Step 9)