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.. Copyright 2017 (China Mobile)
.. This file is licensed under the CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE
.. Full license text at https://creativecommons.org/licenses/by/4.0/legalcode
===========================================================================
ONAP Network Service Descriptor Information Model Specification (Amsterdam)
===========================================================================
Scope
-----
The scope of the present document is to describe the Network Service Descriptor (NSD) Information Model.
Terms, Definitions and Abbreviations
------------------------------------
For the purposes of the present document, the following abbreviations apply:
+------------+--------------------------------------------+
|Abbreviation| Definition |
+------------+--------------------------------------------+
| CM | Conditional Mandatory |
+------------+--------------------------------------------+
| CO | Conditional Optional |
+------------+--------------------------------------------+
| CP | Connection Point |
+------------+--------------------------------------------+
| CPD | Connection Point Description |
+------------+--------------------------------------------+
| DSL | Domain Specific Language |
+------------+--------------------------------------------+
| NCT | Network Connectivity Topology |
+------------+--------------------------------------------+
| NF | Network Function |
+------------+--------------------------------------------+
| NFVO | NFV Orchestrator |
+------------+--------------------------------------------+
| NSD | Network Service Descriptor |
+------------+--------------------------------------------+
| UML | Unified Modeling Language |
+------------+--------------------------------------------+
| VL | Virtual Link |
+------------+--------------------------------------------+
| VNF | Virtual Network Function |
+------------+--------------------------------------------+
NSD Information Model Overview
------------------------------
Network Service (NS) is a set of functions with unspecified connectivity between them or according to one or more forwarding graphs.
The Network Service Descriptor (NSD) is a deployment template which consists of information used by the NFV Orchestrator (NFVO) for life cycle management of an NS.
As illustrated in the following figure, the description of a NS used to deploy an NS instance includes or references the description of its constituent objects:
* Zero, one or more Virtualized Network Function Nodes Descriptors;
* Zero, one or more Physical Network connect PNFs to VLs;
* Zero, one or more nested NSD;
* Zero, one or more Virtual Link Description used by the NFVO to deploy Virtual Links (VL) ; and
* Zero, one or more VNF Forwarding Graph Descriptions.
Functional Requirements
-----------------------
The following table specifies requirements to the templates for NSD instances in R1.
+-----------------+-----------------------------------------------------------------+
| Numbering | Requirement Description |
+-----------------+-----------------------------------------------------------------+
| NST_NSD001 | The NSD shall reference the VNF Node description of constituent |
| | VNFs. |
+-----------------+-----------------------------------------------------------------+
| NST_NSD002 | The NSD shall include the VLDs applicable to the VLs used by the|
| | NS to interconnect its constituent NFs. |
+-----------------+-----------------------------------------------------------------+
| NST_NSD003 | The NSD shall include a globally unique identifier for identify-|
| | ing each descriptor instance. |
+-----------------+-----------------------------------------------------------------+
| NST_NSD004 | The NSD shall include an identifier to select the controller co-|
| | mpatible with the NSD. |
+-----------------+-----------------------------------------------------------------+
| NST_NSD005 | The NSD shall support the capability to include or reference NS |
| | life cycle management scripts describing how to react upon spec-|
| | ific life cycle events, fault detection, performance threshold |
| | crossing detection and other events. |
+-----------------+-----------------------------------------------------------------+
| NST_NSD006 | The NSD shall support the capability to provide monitoring para-|
| | meters to be tracked during the lifetime of a NS instance. |
+-----------------+-----------------------------------------------------------------+
The following table specifies requirements to the templates for VLD instances.
+-----------------+-----------------------------------------------------------------+
| Numbering | Requirement Description |
+-----------------+-----------------------------------------------------------------+
| NST_VLD001 | A VLD shall enable specifying the type of connectivity provided |
| | by the link between VNFs. |
| | In the R1, the VL should support ELAN type at least. |
+-----------------+-----------------------------------------------------------------+
NSD Information Model Definitions
---------------------------------
NSD
^^^
The NSD information element is a template whose instances are used by the VF-C for the lifecycle management of NSs. Note that NSD is actually defined as a special type of service descriptor, whose serviceType is set to "Network". In the same time, NSD can be included into an End-to-End service descriptor, as a resource or in other words, nested service.
+---------------+-----------+-------------+----------+--------------------------------------------+
| Attribute | Qualifier | Cardinality | Content | Description |
+---------------+-----------+-------------+----------+--------------------------------------------+
| id | M | 1 |Identifier| Identifier of this NSD information element.|
| | | | | It globally uniquely identifies an instance|
| | | | | of the NSD. |
+---------------+-----------+-------------+----------+--------------------------------------------+
| name | M | 1 | String | The name of the NSD. |
+---------------+-----------+-------------+----------+--------------------------------------------+
| serviceType | M | 1 | String | Identifies the type of the SD, which is set|
| | | | | to "Network" for NSD. |
+---------------+-----------+-------------+----------+--------------------------------------------+
| vnfd | M | 0..N | VNF id | Consituent VNF node information of this NSD|
+---------------+-----------+-------------+----------+--------------------------------------------+
|virtualLinkDesc| M | 0..N | VLD | Speficies the constituent VLDs. |
+---------------+-----------+-------------+----------+--------------------------------------------+
VL Description
^^^^^^^^^^^^^^
The VL information element provides general information enabling the instantiation of virtual links.
+------------------+-----------+-------------+----------+--------------------------------------------+
| Attribute | Qualifier | Cardinality | Content | Description |
+------------------+-----------+-------------+----------+--------------------------------------------+
| id | M | 1 |Identifier| Identifier of this VirtualLinkDesc informa-|
| | | | | tion element. It globally uniquely identif-|
| | | | | ies a VL Description. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| name | M | 1 | String | Specifies the name of the VL Description. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| description | M | 0..1 | String | Specifies human-readable information on the|
| | | | | purpose of the VL (e.g. control plane traf-|
| | | | | fic). |
+------------------+-----------+-------------+----------+--------------------------------------------+
| isExternalNetwork| M | 1 | Boolean | Whether the VL is external network. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| shared | O | 0..1 | Boolean | Whether the VL is shared. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| network_type | O | 0..1 | String | Network type of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| segmentation_id | O | 0..1 | String | Network segmentation id of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| physical_network | O | 0..1 | String | Physical network of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| mtu | O | 0..1 | Integer | Network MTU of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| cidr | O | 0..1 | String | Subnetwork cidr of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| ip_version | O | 0..1 | String | Subnetwork IP protocol version of the VL. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| enable_dhcp | O | 0..1 | Boolean | Whether or not th subnetwork enables DHCP. |
+------------------+-----------+-------------+----------+--------------------------------------------+
| gateway_ip | O | 0..1 | String | Subnetwork gateway IP address. |
+------------------+-----------+-------------+----------+--------------------------------------------+
VNF Node Description Information
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+-----------------+-----------+-------------+----------+--------------------------------------------+
| Attribute | Qualifier | Cardinality | Content | Description |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| id | M | 1 |Identifier| Identifier of this VNF Descriptjion. |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| name | M | 1 | String | Specifies the name of the VNF Description. |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| description | M | 0..1 | String | Specifies human-readable information on the|
| | | | | purpose of the VNF. |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| vnfminfo | M | 0..1 | String | Identifies VNFM(s) compatible with the VNF |
| | | | | described in the VNF Description. |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| vnfExtCpd | M | 0..N | vnfExtCpd| VNF External Connection Points. |
+-----------------+-----------+-------------+----------+--------------------------------------------+
vnfExtCpd
^^^^^^^^^
+-----------------+-----------+-------------+----------+--------------------------------------------+
| Attribute | Qualifier | Cardinality | Content | Description |
+-----------------+-----------+-------------+----------+--------------------------------------------+
| cpdid | M | 1..N |Identifier| Reference to the correspondent internal CPD|
+-----------------+-----------+-------------+----------+--------------------------------------------+
| vldid | M | 1..N |Identifier| Reference to the external VLD(s).(TBD) |
+-----------------+-----------+-------------+----------+--------------------------------------------+
|
