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. Register the 3rd party 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.
   6. 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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• 21. 0 UUI/Portal create VPN Infra Service 
• 2.1 SO create service instance to AAI
• 2.2 SO decompose the service template.
• 2.3 SO call SDNC create VPN resource
• 2.4 SDNC call AAI to create VPN resource instance
• 2.5 SO call SDNC to activate VPN resource
• 2.6 SDNC call 3rd SOTN controller to create SOTN VPN instance if it is needed. For EPLine/EVPLine ,this operation is not needed here. For EPLAN/EVPLAN, it is needed to create a VPN with no UNIs in the 3rd SOTN controller.
• 2.7 SDNC call AAI to create SOTN VPN Instance, the instance will be related to VPN resource instance.
• 2.8 SDNC call 3rd SD-WAN controller to create SD-WAN VPN instance. This means all the sites deployed later will be attached to the same VPN.
• 2.9 SDNC call AAI to create SD-WAN VPN instance, the instance will be related to VPN resource instance.

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