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The goal of this page is to summarize and prioritize the criteria, when a registration attempt is considered a Re-Registration.
All registration cases, which do not match with re-registration criteria will be considered "initial registrations".

Re-Registration criteria

The following criteria need to be applied (in the order given here), when evaluation, if a registration attempt is a Re-Registration:

1. If a registration attempt is executed for a PNF Instance, which has an existing entry in the ONAP/AAI, and when that PNF instance is associated with an active (orchestration-status==active) service instance
   → Re-Registration

Service/Resource instance state machine

SO project defined the State Machines, related to the service and resource (PNF/VNF) instances life-cycle.
The state machines are defined here. For PNFs, the state machine (simplified is stated as follows):

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At this moment (ONAP/Casablanca release), the orchestration states are not managed by teh the PNF PnP building block (states were state machine was not defined before).
Setting proper states within the PNF PnP BB according to this StateMachine State Machine will probably be added at the beginning of ONAP/El Alto release.

Re-Registration criteria

The following criteria need to be applied (in the order given here), when evaluation, if a registration attempt is a Re-Registration:

1. If a registration attempt is executed for a PNF Instance, which has an existing entry in the ONAP/AAI, and when that PNF instance is associated with an active (orchestration-status==active) service instance
   → Re-Registration