NSD features that shall be supported for the ASD

• The NSD shall still support to define min/max number of instances within the vnf_profile
  • This will be used in order to support flexible deployment of ASD instances
• The existing SOL005 support for Instantiate NS with zero occurrence of some VNF instances and Update NS in order to add VNF instances later can be used for this
• The external virtual link requirement mapping towards NS Virtual Links is required
  • The simplification will be to define a fixed set of Virtual Link requirements in the ASD_in_NSD node type definition
  • If a fixed set is not seen as sufficient it would also be possible in TOSCA to just define one Virtual Link requirement with occurrence [1, UNBOUNDED]
  • Instead of references to cpdIds an implicit reference based on the cpdIds list order will be used, first cpdId using first Virtual Link etc.
• The NSD shall support NSD specific NS additional params
  • It could be relevant to define a number of pre-defined NS additional params, e.g. for target cluster name/id

NSD features not used for ASD packages

• The ASD does not have support for multiple deployment flavors, thus the flavor_id would not be needed in the VNF node template
  • It is already optional so no changes to the NSD template structure
  • It can be constrained/defaulted to “simple” in the ASD_in_NSD
• The ASD does not have support for instantiation levels and scaling, thus the instantiation_level would not be needed in vnf_profile in the VNF node template
  • It is already optional so no changes to the NSD template structure
• NSD level deployment flavor, scaling and instantiation level would not be used
• NSD Service Access Points and externally exposed Virtual Link requirements would not be needed.
  • The NS Virtual Links created based on the ASD virtual link requirements would connect to transport network VPNs that can provide connectivity both within an NS Virtual Link (for distributed NS deployment) and between NS Virtual Links in different NS:es connected to the same VPN
  • Dedicated transport network VPNs for certain NS instances/NS Virtual Links can still be created/managed on Service Orchestration level
• No requirements on Forwarding Graph support
• Support for hierarchical NSDs under discussion in the ongoing Cloud RAN orchestration study
  • Hierarchical NSDs could be a solution for deploying only the NS Virtual Links/network resources that are needed for the deployed FUUs
  • But the preferred solution is instead to include logic in the ORAN NFVO-light to only deploy NS virtual Links with their network resources if at least one FUU that requires the NS Virtual Link is deployed in the NS
• Will require changes in the SOL005 NS Update operation if an NS Virtual Link shall be added later
• No PNF support, the scope for the NSD is only to manage virtualized deployments
• Sharing of VNF instances between NS instances
  • This is recommended to be handled on SO level by sharing of resources in a common NS instance

Note 1: The details of the node type definition for asd and asdInNsd can be found in the following wiki page: TOSCA node types of ASD

Note 2: The details of ASD service template example can be found in the following wiki page: Application Service Descriptor (ASD) Resource Data Model

Note 3: The details of the NSD template example is following:

tosca_definitions_version: tosca_simple_yaml_1_3
imports: nsd_types.yaml

node_types:
  tosca.example_NS:
    derived_from: tosca.nodes.nfv.NS
    properties:
      descriptor_id:
        type: string
        constraints: [ equal: b1bb0ce7-ebca-4fa7-95ed-4840d70a1177 ]
        default: b1bb0ce7-ebca-4fa7-95ed-4840d70a1177
      designer:
        type: string
        constraints: [ equal: MyCompany ]
        default: MyCompany
      name:
        type: string
        constraints: [ equal: ExampleService ]
        default: ExampleService
      version:
        type: string
        constraints: [ equal: '1.0' ]
        default: '1.0'
      invariant_id:
        type: string
        constraints: [ equal: 1111-2222-aaaa-bbbb ]
        default: 1111-2222-aaaa-bbbb
      flavour_id:
        type: string
        constraints: [ equal: simple ]
        default: simple
      interfaces:
        Nslcm:
          type: tosca.interfaces.nfv.Nslcm
          operations:
            instantiate:
              inputs:
                additional_parameters:
                  type: MyCompany.datatypes.nfv.NsInstantiateAdditionalParameters



topology_template:

  node_templates:
    my_service:
      type: tosca.example_NS
      properties:
        descriptor_id: b1bb0ce7-ebca-4fa7-95ed-4840d70a1177 
        designer: MyCompany
        name: ExampleService
        version: '1.0'
        invariant_id: 1111-2222-aaaa-bbbb
        flavour_id: simple
      interfaces:
        Nslcm:
          operations:
            instantiate:
              implementation: instantiate.workflow.yaml
            terminate:
              implementation: terminate.workflow.yaml


    asd_1:
      type: tosca.nodes.asdInNsd
      properties:
        descriptor_id: fdsa-1234-edxc-2ws3
      requirements:
        - virtual_links: NsVirtualLink_1
        - virtual_links: NsVirtualLink_2

    asd_2:
      type: tosca.nodes.asdInNsd
      properties:
        descriptor_id: cabx-2w3w-e4er-2w3e
      requirements:
        - virtual_links: NsVirtualLink_1
        - virtual_links: NsVirtualLink_2
        - dependency: asd_1


    NsVirtualLink_1:
      type: tosca.nodes.nfv.NsVirtualLink
      properties:
        connectivity_type:
          layer_protocols: [ipv4]
          flow_pattern: mesh
        vl_profile:
          max_bitrate_requirements:
             root: 1000
          min_bitrate_requirements:
             root: 1000

    NsVirtualLink_2:
      type: tosca.nodes.nfv.NsVirtualLink
      properties:
        connectivity_type:
          layer_protocols: [ipv4]
          flow_pattern: mesh
        vl_profile:
          max_bitrate_requirements:
             root: 5000
          min_bitrate_requirements:
             root: 10000

  policies:
   - ...