YANG Versioning Solution Overview
draft-verdt-netmod-yang-solutions-02

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Network Working Group                                     R. Wilton, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Informational                          November 3, 2019
Expires: May 6, 2020

                   YANG Versioning Solution Overview
                  draft-verdt-netmod-yang-solutions-02

Abstract

   This document gives a brief overview of the different drafts that
   comprise a full solution to the YANG versioning requirements draft.
   The purpose of this draft is to help readers understand how the
   discrete parts of the YANG versioning solution fit together during
   working group development of the solution drafts.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 6, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Solution Drafts . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Updated YANG Module Revision Handling . . . . . . . . . .   3
     2.2.  Module semantic version number scheme . . . . . . . . . .   4
     2.3.  Versioned YANG packages . . . . . . . . . . . . . . . . .   4
     2.4.  Protocol operations for package version selection . . . .   5
     2.5.  YANG schema comparison tooling  . . . . . . . . . . . . .   5
   3.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [I-D.ietf-netmod-yang-versioning-reqs] documents the requirements for
   any solution to the YANG [RFC7950] versioning problem.  Chapter 5
   lists the formal requirements that a complete solution requires.

   The aim of this draft is to help readers understand how the different
   solution drafts fit together, and also which drafts contribute
   solutions to particular individual requirements.  The overall
   solution comprises five individual drafts:

   1.  [I-D.verdt-netmod-yang-module-versioning]

   2.  [I-D.verdt-netmod-yang-semver]

   3.  [I-D.rwilton-netmod-yang-packages]

   4.  [I-D.wilton-netmod-yang-ver-selection]

   5.  YANG schema comparison tooling (not yet published)

   Open issues, across all of the solution drafts are tracked at
   <https://github.com/netmod-wg/yang-ver-dt/issues>.

2.  Solution Drafts

   The complete solution to the YANG versioning requirements comprises
   five solution drafts, that are summarized below.

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2.1.  Updated YANG Module Revision Handling

   In summary, [I-D.verdt-netmod-yang-module-versioning] specifies
   minimal extensions and updates to the YANG language, YANG Library,
   and YANG author guidelines to provide more flexible YANG module
   revision handling.  The intent is that these changes and extensions
   could be folded into future revisions of the updated specifications.
   The draft provides a solution for all requirements except Req 2.2,
   Req 3.1 and Req 3.2.

   The extensions and changes in the draft can be summarized thus:

   o  It defines a YANG extension statement to indicate where non-
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