YANG Semantic Versioning for Modules
draft-verdt-netmod-yang-semver-00

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Network Working Group                                          B. Claise
Internet-Draft                                                 J. Clarke
Updates: 7950 (if approved)                                    R. Rahman
Intended status: Standards Track                          R. Wilton, Ed.
Expires: September 12, 2019                          Cisco Systems, Inc.
                                                              B. Lengyel
                                                                Ericsson
                                                               J. Sterne
                                                                   Nokia
                                                              K. D'Souza
                                                                    AT&T
                                                          March 11, 2019

                  YANG Semantic Versioning for Modules
                   draft-verdt-netmod-yang-semver-00

Abstract

   This document specifies a new YANG module update procedure using
   semantic version numbers, to allow for limited non-backwards-
   compatible changes, as an alternative proposal to module update rules
   in the YANG 1.1 specifications.  This document updates RFC 7950, RFC
   8407 and RFC 8525.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Claise, et al.         Expires September 12, 2019               [Page 1]
Internet-Draft           YANG Module Versioning               March 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Updates to YANG RFCs  . . . . . . . . . . . . . . . . . .   4
       1.1.1.  Updates to RFC7950  . . . . . . . . . . . . . . . . .   4
       1.1.2.  Updates to RFC8525  . . . . . . . . . . . . . . . . .   4
       1.1.3.  Updates to RFC8407  . . . . . . . . . . . . . . . . .   5
     1.2.  Complementary solutions for the other requirements  . . .   5
   2.  YANG Semantic Versioning  . . . . . . . . . . . . . . . . . .   6
     2.1.  Classification of changes between module revisions  . . .   6
     2.2.  YANG Semantic Versioning Scheme for Modules . . . . . . .   7
       2.2.1.  Examples for YANG semantic version numbers  . . . . .   8
     2.3.  YANG Semantic Version Update Rules  . . . . . . . . . . .  10
     2.4.  YANG Module Semver Extension  . . . . . . . . . . . . . .  11
   3.  Import by Semantic Version  . . . . . . . . . . . . . . . . .  13
     3.1.  Module import examples  . . . . . . . . . . . . . . . . .  15
   4.  Classifying changes in YANG modules . . . . . . . . . . . . .  16
     4.1.  Editorial changes . . . . . . . . . . . . . . . . . . . .  16
     4.2.  Backwards-compatible changes  . . . . . . . . . . . . . .  16
     4.3.  Non-backwards-compatible changes  . . . . . . . . . . . .  17
   5.  Updates to ietf-yang-library  . . . . . . . . . . . . . . . .  17
     5.1.  Advertising module version number . . . . . . . . . . . .  17
     5.2.  Resolving ambiguous module imports  . . . . . . . . . . .  17
     5.3.  Reporting how deprecated and obsolete nodes are handled .  18
   6.  YANG status description extension . . . . . . . . . . . . . .  19
   7.  Semantic versioning of YANG instance data . . . . . . . . . .  19
   8.  Guidelines  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     8.1.  Guidelines to YANG model authors  . . . . . . . . . . . .  20
       8.1.1.  Use of YANG semantic versioning . . . . . . . . . . .  20
       8.1.2.  Making non-backwards-compatible changes to a YANG
               module  . . . . . . . . . . . . . . . . . . . . . . .  21