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Summary
This input includes following proposals
- Simplified NsVirtualLink Toscal Model.
- Corresponding Group, Policy and node types.
- Possible implementation data models of virtual links
Simplified Network Service Virtual Link model.
Below is the simplified model for the TOSCA which proposes to merge the properties in virtual link descriptor, virtual link deployment flavour and virtual link profiles in to one node type NsVirtualLink.

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Following elements are modeled as Data Types

Code Block

title	tosca.datatypes.nfv.ConnectivityType
linenumbers	true
collapse	true

  tosca.datatypes.nfv.ConnectivityType:
    derived_from: tosca.datatypes.Root
    description: virtual link connectivity type
    properties:
      protocol:
        type: list
        required: true
        default: 
		  - ipv4
 		entry_schema:
          constraint: 
            -valid_values: [ethernet, mpls, odu2, ipv4, ipv6, pseudo-wire]
		
      flowPattern:
        type: string
        required: false
        default: line
        constraint: 
          -valid_values: [line, tree, mesh]

Code Block

title	tosca.datatypes.nfv.Qos
linenumbers	true
collapse	true

tosca.datatypes.nfv.Qos:
  derived_from: tosca.datatypes.Root
  description: virtual link quality of service parameters
  properties:
    latency:
      type: float
      description: maximum latency in ms
      required: true
      constraints:
        greater_or_equal: 0
        
    packetDelayVariation:
      type: float
      description: maximum jitter in ms
      required: true

    packetLossRatio:
      type: float
      description: maximum packet loss ratio
      required: false
      constraints:
        greater_or_equal: 0

    priority:
      type: integer
      description: Specifies the priority level in case of congestion on the underlying physical link
      required: false

    bitrateRequired:
      type: tosca.datatypes.nfv.Bitrate
      description: required bitrate
      required: true

    minBitrate:
      type: tosca.datatypes.nfv.Bitrate
      description: min bitrate supported
      required: true

    maxBitrate:
      type: tosca.datatypes.nfv.Bitrate
      description: max bitrate supported
      required: true

Code Block

title	tosca.datatypes.

...

nfv.Bitrate
linenumbers	true
collapse	true

tosca.datatypes.nfv.Bitrate:
  derived_from: tosca.datatypes.Root
  description: link bit rate
  properties:
    root:
      type: float
      description: throughput of the link
      required: true
      constraints:
        greater_or_equal: 0
        
    leaf:
      type: float
      description: throughput of the leaf connection
      required: false
      constraints:
        greater_or_equal: 0

Code Block

title	tosca.datatypes.nfv.ServiceAvailability
linenumbers	true
collapse	true

tosca.datatypes.nfv.ServiceAvailability:
  derived_from: tosca.datatypes.Root
  description: service availability 
  properties:
    Level:
      type: float
      description: service availability levels
      required: true
      constraints:
        - valid_values: [ Level1, Level2, Level3 ]

Groups and policy for Affinity/ Anti-affinity

Code Block

title	tosca.grouptypes and tosca.policytypes
linenumbers	true
collapse	true

group_types:
  tosca.grouptypes.nfv.VlPlacementGroup:
    derived_from: tosca.grouptypes.Root
    members: [tosca.nodes.nfv.NsVirtualLink]

	
policy:
  tosca.policytypes.nfv.vlPlacementPolicy:
    derived_from: tosca.policytypes.Root:
    properties:
      policy:
        type: string
        description: type of the rule - "affinity" or "anti-affinity".
        required: true
        constraints:
          -valid_values: [affinity, anti-affinity]
		
      scope:
        type: string
        description: scope of the rule is an NFVI-node, an NFVI-PoP, etc.
        required: true
        constraints:
          -valid_values: [nfvi-node, nfvi-pop]

    targets: [tosca.grouptypes.nfv.VlPlacementGroup]

Virtual Link Data Modelling

Virtual links need to be realized on the physical infrastructure based on the topology.
This means the same virtual ink can be realized with more than one way.
Followign is a simplified example of two types realizations. So even the wan link can also be realized a specific implementation of the virtual link.

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Proposal
- Network Service template would specifiy an abstract NsVirtualLink
- Each implemention can be specified as a separate service template using the substitution mapping.
- Orchestractor would select the suitable subistituable service template based on the underlying infrastructure.
  
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Ns Virtual Iink Node type

Code Block

title	tosca.nodes.nfv.NsVirtualLink
linenumbers	true
collapse	true

node_types:
  tosca.nodes.nfv.NsVirtualLink:
    derived_from: tosca.nodes.Root
    description: node definition of Virtual Links
    properties:
      id:
        type: string
        required: true
		
      provider:
        type: string
        required: false
		
      version:
        type: string
        required: true
		
      bitrate:
        type: tosca.datatypes.nfv.Bitrate
        description: required bitrate
		
      connectivity_type:
        type: tosca.datatypes.nfv.ConnectivityType
        description: virtual link connectivty type
        required: true
	
      qos:
        type: tosca.datatypes.nfv.Qos
        description: virtual link quality of service
        required: false
	
      service_availability:
        type: tosca.datatypes.nfv.ServiceAvailability
        description: virtual link service availability levels
        required: false	
		

    attributes:
      bitrate:
        type: tosca.datatypes.nfv.Bitrate
        description: current bitrate
	  	
    capabilities:
      VirtualLinkable:
        type: tosca.capabilities.nfv.VirtualLinkable

Service template with a implemenation of virtual link

Code Block

title	service template
linenumbers	true
collapse	true

description: virtual link with deployment flavor - small support

topology_template:

  input: 
      id:
        type: string
        required: true
        constraints:
          - valid_values: [ "small" ]
		  
      bitrate:
        type: tosca.datatypes.nfv.Bitrate
        description: required bitrate
		
      connectivity_type:
        type: tosca.datatypes.nfv.ConnectivityType
        description: virtual link connectivty type
        required: true
	
      qos:
        type: tosca.datatypes.nfv.Qos
        description: virtual link quality of service
        required: false
	
      service_availability:
        type: tosca.datatypes.nfv.ServiceAvailability
        description: virtual link service availability levels
        required: false	
		
    
  substitution_mappings:
    node_type: tosca.nodes.nfv.NsVirutalLink
    properties:
      id: [id]
    capabilities:
      VirtualLinkable: [subnet, VirtualLinkable]
      ...

  node_templates:
  
    network1:
	  type: tosca.nodes.nfv.network
      properties:
         ...
	
				
    subnet:
	  type: tosca.nodes.nfv.subnet
      properties:
         ...
  output:
    bitrate:
      type: tosca.datatypes.nfv.Bitrate
      description: current bitrate

More Information in the attached file

View file

name	NS_VirtualLink.pptx
height	250

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