Issues with ns-nbi about topology references

[aguoietf]

There are a few issues with the current ns-nbi model:

• unnecessary (single-node) topology layer NS.Topology.Isssue.v01.pptx

• Topology reference is per network slice; it should be per connectivity construct

• It is better for topology instance to reference ns-topo and not te-topo

  • (i.e. must network-type=network slice)

• It is not meaningful to just include references to a topology without using it

Proposal from the side meeting to resolve issues for topology references :

• remove the topology reference from the ns-nbi and move it to the ns-topo
• the ns-topo model will augment ns-nbi to support slice topology configuration (as an optional feature)