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YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)
RFC 6020

Document type: RFC - Proposed Standard (October 2010; Errata)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 6020 (Proposed Standard)
Responsible AD: Dan Romascanu
Send notices to: netmod-chairs@tools.ietf.org, draft-ietf-netmod-yang@tools.ietf.org

Internet Engineering Task Force (IETF)                 M. Bjorklund, Ed.
Request for Comments: 6020                                Tail-f Systems
Category: Standards Track                                   October 2010
ISSN: 2070-1721

                  YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)

Abstract

   YANG is a data modeling language used to model configuration and
   state data manipulated by the Network Configuration Protocol
   (NETCONF), NETCONF remote procedure calls, and NETCONF notifications.

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 5741.

   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/rfc6020.

Copyright Notice

   Copyright (c) 2010 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Bjorklund                    Standards Track                    [Page 1]
RFC 6020                          YANG                      October 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   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.

Table of Contents

   1. Introduction ....................................................8
   2. Keywords ........................................................8
   3. Terminology .....................................................8
      3.1. Mandatory Nodes ...........................................10
   4. YANG Overview ..................................................11
      4.1. Functional Overview .......................................11
      4.2. Language Overview .........................................13
           4.2.1. Modules and Submodules .............................13
           4.2.2. Data Modeling Basics ...............................13
           4.2.3. State Data .........................................18
           4.2.4. Built-In Types .....................................18
           4.2.5. Derived Types (typedef) ............................19
           4.2.6. Reusable Node Groups (grouping) ....................20
           4.2.7. Choices ............................................21
           4.2.8. Extending Data Models (augment) ....................22
           4.2.9. RPC Definitions ....................................23
           4.2.10. Notification Definitions ..........................24
   5. Language Concepts ..............................................25
      5.1. Modules and Submodules ....................................25
           5.1.1. Import and Include by Revision .....................26
           5.1.2. Module Hierarchies .................................27
      5.2. File Layout ...............................................28
      5.3. XML Namespaces ............................................29
           5.3.1. YANG XML Namespace .................................29
      5.4. Resolving Grouping, Type, and Identity Names ..............29
      5.5. Nested Typedefs and Groupings .............................29
      5.6. Conformance ...............................................30
           5.6.1. Basic Behavior .....................................31
           5.6.2. Optional Features ..................................31

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