New YANG Module Update Procedure
draft-clacla-netmod-yang-model-update-06

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Network Working Group                                          B. Claise
Internet-Draft                                                 J. Clarke
Updates: 7950 (if approved)                          Cisco Systems, Inc.
Intended status: Standards Track                              B. Lengyel
Expires: January 3, 2019                                        Ericsson
                                                              K. D'Souza
                                                                    AT&T
                                                            July 2, 2018

                    New YANG Module Update Procedure
                draft-clacla-netmod-yang-model-update-06

Abstract

   This document specifies a new YANG module update procedure in case of
   backward-incompatible changes, as an alternative proposal to the YANG
   1.1 specifications.  This document updates RFC 7950.

Status of This Memo

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

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   This Internet-Draft will expire on January 3, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Solution  . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Semantic Versioning . . . . . . . . . . . . . . . . . . .   3
       2.1.1.  Semantic Versioning, As Set by the YANG Module
               Designer  . . . . . . . . . . . . . . . . . . . . . .   3
       2.1.2.  The Derived Semantic Version  . . . . . . . . . . . .   5
       2.1.3.  Implementation Experience . . . . . . . . . . . . . .   5
     2.2.  Import by Semantic Version  . . . . . . . . . . . . . . .   6
     2.3.  Updates to YANG 1.1 Module Update Rules . . . . . . . . .   9
     2.4.  Updates to ietf-yang-library  . . . . . . . . . . . . . .   9
     2.5.  Deprecated and Obsolete Reasons . . . . . . . . . . . . .  10
   3.  Semantic Version Extension YANG Module  . . . . . . . . . . .  11
   4.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  15
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
     6.1.  YANG Module Registrations . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Appendix . . . . . . . . . . . . . . . . . . . . . .  16
     A.1.  Open Issues: Requirements to be Addressed . . . . . . . .  17
     A.2.  Open Issues . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   This document puts forth a solution to the problems described in
   [I-D.verdt-netmod-yang-versioning-reqs] by proposing changes to
   [RFC7950] to address the various requirements that
   [I-D.verdt-netmod-yang-versioning-reqs] specifies.  At this time, the
   solution herein addresses requirements 1.1, 1.2, 1.3, 2.1, 4.1, 4.2,
   4.3, 5.1, and 5.2.  Current gaps are documented in Appendix A.1
   below.

2.  The Solution

   The solution is composed of five parts:

   1.  A semantic versioning YANG extension, along with an optional
       additional check that validates the semantic versioning from a
       syntactic point of view, which can either assist in determining
       the correct semantic versioning value, or which can help in

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