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1. Service registration per service provider instances
   • Registration
     Service instances are registered to the registry by proxy or themselves. The visible scope should be indicated as a parameter when register. If a service is only internal visible, the service information is only pulled by the internal gateway (aka router & load balancer) and used by other components inside the system, the interal services can't be accessed by external systems or front end(web client). If a service is visible to external system, the service information is pulled by the external gateway and can be accessed by external systems and front end (web client) with auth.
              
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   • Discovery ? & Service Consuming
     • For internal service consumers(Components inside ONAP system, such as A&AI, SO, Controller, etc.)
       • Client side discovery and load balancing
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       • Server side discovery and load balancing
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     • For external service clients(OSS, BSS, Web client, etc.), access the service via external gateway
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2. Service registration per service
   The service may have its own load balancer built inside, for example, Kubernetes can create a load balancer for a service. In such case, only need to register the service LB node to MSB, and the service request from the consumer is routed to the service LB node.
   
   • Registration
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   • Discovery ? Service Discovery  & Service Consuming
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     Note: Only show the client side discovery in this diagram for simplicity, it's also possible to use server side discovery by the internal gateway.
     
     
3. MSB Hierarchy 
   
   • Registration
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   • Discovery ? & Service Consuming
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4. Centralized Authentication&Authorization via MSB plugin
   
   
   
   
   
   

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