Building NS modular bring a lot of benefits.

  • Simplifies NS building ; simple small networks built and then composed to make it complex.
  • Reduces maintenance overheads.
  • Allows reuse ; use the existing the network service.
  • Individual NS can be from different companies.
  • Can have hierarchy.


The proposal is to define the TOSCA node model for the NS  (abstract and substituted service template) which facilitates the modularity , composition and nesting of NS. 

  • NS can include VNF, PNF and other nested NS along with the SAP if any.




  • Nested NS is represented as an abstract node which can have its implementation as another service template or it can be referenced from an existing NS.

Network Service node (abstract) 
  

node_types:
  tosca.nodes.nfv.NS.NS1:
    derived_from: tosca.nodes.Root
    version: 1.0.0
    description: specific network service node.
    properties:
      id: 
        type: string
        description: network service descriptor identifier (NSD).
        required: true
      designer:
        type: string
        description: identifies the designer of NSD.
        required: true
      version:
        type: string
        description: identifies the version of NSD.
        required: true
      name:
        type: string
        description: name of the NSD.
        required: true
      invariantId:
        type: string
        description: version independent network service descriptor identifier (NSD).
        required: true
	   ...
    interfaces:
      Basic:
        type: tosca.interfaces.nfv.ns.lifecycle.Basic
        ...

    requirements: 
      - virtualLinkable1: tosca.capabilities.nfv.VirtualLinkable
      - virtualLinkable2: tosca.capabilities.nfv.VirtualLinkable
Network Service template 
  
description: World Famous Network Service

topology_template:
  substitution_mappings:
    node_type: tosca.nodes.nfv.NS.NS1
    properties:
      id: 316aa140-c99a-4a08-b8f5-8e2cb73c83e8
      designer: Nokia
      version: "1.0.0"
      name: "World Famous"
      invariantId: 416aa140-c99a-4a08-b8f5-8e2cb73c8fef

    requirements:
      - virtualLinkable1: [ vnf1,   virtualLinkable2 ]
      - virtualLinkable2: [ SAP1,   virtualLinkable2 ]
 
    capabilities:
      ...
    interfaces:
      ...

  node_templates:
  
    vnf1:
      type: tosca.nodes.nfv.VNF.VNF1
      properties:
         ...

      requirements:
        - virtualLinkable1: VL1 #virtualLinkable2 is exposed through substitution mapping

        
                
    ns2:
      type: tosca.nodes.nfv.NS.NS2
      properties:
         ...

      requirements:
        - virtualLinkable1: VL1

    pnf:
      type: tosca.nodes.nfv.PNF.PNF1
      properties:
         ...

      requirements:
        - virtualLinkable1: VL1
    
    VL1:
      type: tosca.nodes.nfv.VL
      properties:
       ...

    SAP1:
      type: tosca.nodes.nfv.SAP
      properties:
        layer_protocol: ipv4
        sap_address_assignment: true
      requirements:
        - virtualLinkable1: VL1 #virtualLinkable2 is exposed through substitution mapping
      ...


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2 Comments

  1. Anatoly Katzman

    Nagesha Subramanya, hi

    I think it would be less confusing to have this page in this folder, it was specially created for all discussions related to the Service DM

  2. Hui Deng

    Hi  Nagesha Subramanya

    could you kindly help to move this page into input folder? thanks a lot