Use Case Authors:

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• Service onboarding
• Service configuration
• Service termination 
• Self service addaption (Bandwidth on demand  to be added)
• Auto-scaling based on  fault and performance (stretch goal)
• fault detection and auto-healing (stretch goal)
• data correlation and analytics (stretch goal)

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1. Topology Notification flow
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   1.0 3rd SDN controller notify the single domain topology to SDNC.
   1.1 . Register the 3rd SOTN Controller to ESR.
   2. ESR trigger a 3rd Controller registered event to Dmaap.
   3. SDNC subscribe the event and this event notified .
   4. SDNC synchronize the topology from 3rd SOTN controller.
   5. SDNC analyse the data from 3rd SDN controller.  Get the nodes, links, terminal points of the topology.
   16. 2 SDNC call A&AI to create the nodes, links terminal points to save the topology.
         Note: For multi 3rd SDN controllers, there will be several topologies notified.  The links across the domain topology should be discovered or created by ONAP. 
   
   
2. Vpn Infra Service Deploy Flow
   
   

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