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.
Image Added
- 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.
Code Block |
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title | Network Service node (abstract) |
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linenumbers | true |
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collapse | true |
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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
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Code Block |
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title | Network Service template |
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linenumbers | true |
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collapse | true |
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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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- More info in the attached presentation - NSD modeling Rel2.pptx