The issue: In the current implementation, Core endpoints are need before a slice is created, however, Core CNFs' IP addresses are not available until CNFs are instantiated as part of slice allocation.
We will have the same issue for RAN endpoint discovery if RAN FNs are dynamically instantiated instead of pre-instantiated as currently done.
Suggestions: Pre-configure DC gateway/server and get the CNFs' IP addresses via gateway/server. Details need to be worked out.