The YANG 1.1 Data Modeling Language
RFC 7950
| Document | Type | RFC - Proposed Standard (August 2016; Errata) | |
|---|---|---|---|
| Author | Martin Björklund | ||
| Last updated | 2020-01-21 | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Jürgen Schönwälder | ||
| Shepherd write-up | Show (last changed 2016-04-28) | ||
| IESG | IESG state | RFC 7950 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Benoît Claise | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) M. Bjorklund, Ed.
Request for Comments: 7950 Tail-f Systems
Category: Standards Track August 2016
ISSN: 2070-1721
The YANG 1.1 Data Modeling Language
Abstract
YANG is a data modeling language used to model configuration data,
state data, Remote Procedure Calls, and notifications for network
management protocols. This document describes the syntax and
semantics of version 1.1 of the YANG language. YANG version 1.1 is a
maintenance release of the YANG language, addressing ambiguities and
defects in the original specification. There are a small number of
backward incompatibilities from YANG version 1. This document also
specifies the YANG mappings to the Network Configuration Protocol
(NETCONF).
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7950.
Bjorklund Standards Track [Page 1]
RFC 7950 YANG 1.1 August 2016
Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
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material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Bjorklund Standards Track [Page 2]
RFC 7950 YANG 1.1 August 2016
Table of Contents
1. Introduction ....................................................9
1.1. Summary of Changes from RFC 6020 ..........................10
2. Key Words ......................................................12
3. Terminology ....................................................12
3.1. A Note on Examples ........................................16
4. YANG Overview ..................................................16
4.1. Functional Overview .......................................16
4.2. Language Overview .........................................18
4.2.1. Modules and Submodules .............................18
4.2.2. Data Modeling Basics ...............................19
4.2.3. Configuration and State Data .......................23
4.2.4. Built-In Types .....................................24
4.2.5. Derived Types (typedef) ............................25
4.2.6. Reusable Node Groups (grouping) ....................25
4.2.7. Choices ............................................27
4.2.8. Extending Data Models (augment) ....................28
4.2.9. Operation Definitions ..............................29
4.2.10. Notification Definitions ..........................31
5. Language Concepts ..............................................32
5.1. Modules and Submodules ....................................32
5.1.1. Import and Include by Revision .....................33
5.1.2. Module Hierarchies .................................34
5.2. File Layout ...............................................36
5.3. XML Namespaces ............................................36
5.3.1. YANG XML Namespace .................................36
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