ETSI GS NFV-SOL 006 V3.5.1 (2021-07)

Network Functions Virtualisation (NFV) Release 3; Protocols and Data Models; NFV descriptors based on YANG Specification

RGS/NFV-SOL006ed351

General Information

• Status: Not Published
• Technical Committee: NFV SOL - Solutions
• Current Stage: 12 - Completion
• Due Date: 28-Jul-2021
• Completion Date: 06-Jul-2021

Standards Content (Sample)

ETSI GS NFV-SOL 006 V3.5.1 (2021-07)






GROUP SPECIFICATION
Network Functions Virtualisation (NFV) Release 3;
Protocols and Data Models;
NFV descriptors based on YANG Specification
Disclaimer
The present document has been produced and approved by the Network Functions Virtualisation (NFV) ETSI Industry
Specification Group (ISG) and represents the views of those members who participated in this ISG.
It does not necessarily represent the views of the entire ETSI membership.
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2 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)

Reference
RGS/NFV-SOL006ed351
Keywords
data, model, NFV, YANG

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3 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 6
3.3 Abbreviations . 6
4 Overview of YANG model . 6
4.1 General . 6
4.2 Conventions . 6
5 General concept of using YANG to model NFV descriptors . 7
5.1 Introduction . 7
5.2 Augmentation rules in YANG . 7
6 NFV YANG module definitions . 7
6.1 Introduction . 7
6.2 VNFD YANG Module definitions . 8
6.3 NSD YANG module definitions . 8
6.4 PNFD YANG module definitions . 8
6.5 Descriptors YANG module definitions . 8
6.6 Other YANG sub-module definitions. 8
6.7 Common YANG module definitions . 8
Annex A (informative): YANG modelling example for NFV . 9
A.1 Introduction . 9
A.2 Multi-DF example . 9
A.2.1 General . 9
A.2.2 Firewall Router Deployment Flavour Example . 9
A.2.3 Router Firewall DPI NS Deployment Flavour Example . 10
A.3 Extending VnfInfoModifiableAttributes . 11
A.4 Extending VnfLcmOperationsConfiguration . 11
Annex B (informative): Change History . 13
History . 15


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4 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
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Foreword
This Group Specification (GS) has been produced by ETSI Industry Specification Group (ISG) Network Functions
Virtualisation (NFV).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI

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5 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)
1 Scope
The present document specifies the YANG models for representing Network Functions Virtualisation (NFV)
descriptors, fulfilling the requirements specified in ETSI GS NFV-IFA 011 [1] and ETSI GS NFV-IFA 014 [2]
applicable to a Virtualised Network Function Descriptor (VNFD), a Physical Network Functions Descriptor (PNFD)
and a Network Service Descriptor (NSD).
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI GS NFV-IFA 011: "Network Functions Virtualisation (NFV) Release 3; Management and
Orchestration; VNF Descriptor and Packaging Specification".
[2] ETSI GS NFV-IFA 014: "Network Functions Virtualisation (NFV) Release 3; Management and
Orchestration; Network Service Templates Specification".
[3] IETF RFC 7950: "The YANG 1.1 Data Modeling Language".
NOTE: Available at https://tools.ietf.org/html/rfc7950.
[4] IETF RFC 7951: "JSON Encoding of Data Modeled with YANG".
NOTE: Available at https://tools.ietf.org/html/rfc7951.
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] IETF RFC 6241: "Network Configuration Protocol (NETCONF)".
NOTE: Available at https://tools.ietf.org/html/rfc6241.
[i.2] IETF RFC 8040: "RESTCONF Protocol".
NOTE: Available at https://tools.ietf.org/html/rfc8040.
[i.3] IETF RFC 8340: "YANG Tree Diagrams".
NOTE: Available at https://tools.ietf.org/html/rfc8340.
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6 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)
[i.4] ETSI GS NFV-SOL 001: "Network Functions Virtualisation (NFV); Protocols and Data Models;
NFV descriptors based on TOSCA specification".
[i.5] ETSI GS NFV 003: "Network Functions Virtualisation (NFV); Terminology for Main Concepts in
NFV".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI GS NFV 003 [i.5] apply.
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI GS NFV 003 [i.5] and the following apply:
ASA Adaptive Security Appliance
CSR Cloud Service Router
DPI Deep Packet Inspection
HTML HyperText Markup Language
HTTP HyperText Transfer Protocol
JSON JavaScript Object Notation
REST Representational State Transfer
RPC Remote Procedure Call
URL Uniform Resource Locator
4 Overview of YANG model
4.1 General
The YANG data modelling language is defined in IETF RFC 7950 [3]. The YANG language is used to model
configuration and state data. IETF RFC 7950 [3] states that the data model represented by YANG is meant to be
manipulated by the Network Configuration Protocol (NETCONF) [i.1]. Since IETF RFC 7950 [3] was written
HTTP REST based protocols such as IETF RFC 8040 [i.2] (RESTCONF) have been specified and adopted for use with
YANG based models.
4.2 Conventions
There are some common YANG practices that dictate the naming convention in the model. First of all, YANG does not
use camel case in its naming. Instead it uses kebab-case, also known as lisp-case or cobol-case naming convention.
Therefore an attribute in the information model like defaultLocalizationLanguage would be represented as default-
localization-language in the YANG model.
The second thing about the YANG language is that it is hierarchical in nature. The top level container therefore
represents the parent for all the child nodes underneath it. Therefore, there is no need to repeat the name of the parent in
the child node. A child node vnfd-element-group-id in the parent container vnfd-element-group would simply be
renamed as id. Multiple entries of a certain attribute will be represented as list or leaf-list. To identify an entry in such a
list requires a key. A key in general is named as "id". Therefore all such identifiers have been renamed as "id" in the
model.
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7 ETSI GS NFV-SOL 006 V3.5.1 (2021-07)
5 General concept of using YANG to model NFV
descriptors
5.1 Introduction
A NFV descriptor (VNFD, PNFD or NSD) is modelled using the YANG models defined in the present specification
and then shall be encoded in the Extensible Markup Language (XML) as specified in IETF RC 7950 [3] or as JSON text
using the procedures specified in IETF RFC 7951 [4].
One of the goals of the present document is to ensure that it is straight forward to translate between a TOSCA Service
Template which adheres to ETSI GS NFV-SOL 001 [i.4] and a JSON or XML text document which adheres to the
YANG models specified in the present document.
YANG [3] is a data modelling language used to model configuration data, state data, RPCs, and notifications for
network management protocols. It is used by protocols such as NETCONF [i.1] and RESTCONF [i.2] to communicate
such configuration, state, RPC or notification data. NFV descriptors described in ETSI GS NFV-IFA 011 [1] and ETSI
GS NFV-IFA 014 [2], are therefore defined in the present document in the form of a YANG model.
The model follows the information model in ETSI GS NFV-IFA 011 [1] and ETSI GS NFV-IFA 014 [2] in its design.
5.2 Augmentation rules in YANG
IETF RFC 7950 [3], section 7.17 defines the "augment"
...