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1. Association between NST and NSST shall be fixed at design time. In other words, an NST shall be composed of a set of NSSTs at design time.
2. As a result of (1), the AllocateNSSI API shall contain NSST info. This shall be re-visited beyond Guilin.
3. If the NSSMF is not capable of NSSI selection, ONAP acting as NSMF shall perform NSSI selection also and then pass the NSSI info in the AllocateNSSI API. This situation shall arise only when connecting to an external NSSMF, as all NSSMFs within ONAP shall support NSSI selection.

2. Common NSSMF

3. Core Slicing

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