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• Multi-Cloud Policy Framework
  • Assist OOF in target cloud region selection for VNF placement (aka homing) through intent

    • Cloud Agnostic Intent (Policy) Execution Workflow  - Steps 1- 6

  • Dynamically modify the cloud specific VNF deployment template based on cloud-specific realization of the specified intent (e.g. Infra HA for VMs within a VNF could have different realizations across different clouds)

    • Cloud Agnostic Intent (Policy) Execution Workflow  - Step 7

• Intent Support

  • Single realization option per Cloud Region for the specified Intent

• Impact Projects:
  • Multi-Cloud (Highest), OOF, SO (Minimal)
• End-to-end use case demonstration:
  • vCPE (higher priority – no additional implementation dependency), vDNS
• Types of intent supported (through OOF Policy)
  • "Infrastructure High Availability for VNF" 
  • "Infrastructure Resource Isolation for VNF": "Burstable QoS" 
  • "Infrastructure Resource Isolation for VNF": "Guaranteed QoS"

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Step 4. OOF → SO - Return the target <cloud owner, cloud region> for the Service Instance + deployment-intent per vnfc (code changes in OOF for R3)

OOF ↔ SO API extension (VNFC deployment-intent) -- identical in content to SO <-> MC Policy API- aligned to the OOF/SO API defined by SO Casablanca HPA Design to minimize the terminology set. Since 

Step 5. SO → MC - Deploy VNF template in the target <cloud owner, cloud region> for the Service Instance (code changes in Multi-Cloud for R3)

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• Parse Template (e.g. OpenStack Heat Template)
  
  • For each VNFC, instance type in the template
    Fetch Cloud-Agnostic Workload Deployment Policy (Intent) based on VNFC (e.g. vGW)Value/Content: <Policy JSON> 
    
    • Parse Policy JSON coming in the SO ↔ MC directives API
    • Modify template (if needed) according to Intent 
      • Intent examples of interest for R3 
        
        • "Infrastructure High Availability (HA) for VNF" 
        • "Infrastructure Resource Isolation for VNF"   
          • "Burstable QoS"
        • "Infrastructure Resource Isolation for VNF"   
          • "Guaranteed QoS"

• Policy (Intent) Realization

  • Determining the flavor (OpenStack-based VIMs) # same logic applies for instance type in Azure
    • Each VNFC uniquely maps to a Flavor - for e.g. VNFC "vgw" maps to "vgw-base", "vDNS" maps to "vDNS-base"
    • Beyond Casablanca
      • VNFC intent to realization mapping happens through A&AI. 
  • "Infrastructure High Availability (HA) for VNF"
    • OpenStack-based Cloud realization 
      • For R3, Host-based anti-affinity using server groups //Beyond R3, Support other anti-affinity models at availability zone level etc. 
      • Implementation Notes: 
        • Instance "count" in heat template specifies VNFC scale out factor 
        • While dynamic injection of server group into heat template is ideal, a simple starting point could be just switching to an alternate heat template which is identical to the deployment template and additionally has server group
    • Azure realization 
      • Availability Set?

  • "Infrastructure Resource Isolation for VNF" – { "qosProperty": { {"Burstable QoS": "TRUE", "Burstable QoS Oversubscription Percentage": "25"} } }

    • OpenStack-based VMware VIO Cloud realization

      • This can be achieved through min guarantee -- Max or limit (upper bound) & Min or Reservation (guarantee) are part of OpenStack flavor metadata

        • https://docs.openstack.org/horizon/latest/admin/manage-flavors.html

        • https://blogs.vmware.com/openstack/resources-guarantee-openstack-and-vmware-integrated-openstack/

  • • • Example 
        • VNFC "vgw" with "Guaranteed QoS" 
          • vCPU (Min/Max) - 16, Mem (Min/Max) - 32GB 
          • Maps to "vgw-Guaranteed-QoS" flavor for OpenStack-based VIMs
          • Same VNFC with "Burstable QoS", 25% over-subscription 
            • vCPU (Min) - 16, Mem (Min) - 32GB 
            • vCPU (Max) - 20, Mem (Max) - 40GB  
            • Maps to "vgw-Burstable-QoS-25-percent-oversubscription" flavor for OpenStack-based VIMs
        • VNFC "vDNS" with "Guaranteed QoS" & "Infrastructure High Availability"
          • Maps to "vDNS-Guaranteed-QoS" flavor and "vDNS-infrastructure-high-availability" heat template
      • Only certain pre-defined over-subscription values are allowed to simplify implementation
      • Implementation Notes:
        • While dynamic injection of limit/reservation into flavor is ideal, a simple starting would be to be to switch to a pre-defined flavor in the environment file
          • For aforementioned example
            • Original flavor - "flavor-xyz-no-oversubscription"
            • Modified flavor based on Policy - "flavor-xyz-25-percent-oversubscription" 
  • Implementation Notes:
    
    • From an implementation stand point, MC would be exposing a Workload Deployment Policy (Intent) API
      • Input : deployment-intent, cloud owner, cloud region, deployment template, deployment environment file, ...
      • Output : Success or Failure with reason, modified deployment template, modified deployment environment file, ...

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