NMDA protocol operation Backwards-Compatibility with Legacy Devices
draft-wu-netconf-nmda-compatibility-01

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NETCONF Working Group                                              Q. Wu
Internet-Draft                                                   C. Feng
Intended status: Standards Track                                  Huawei
Expires: September 10, 2019                                March 9, 2019

  NMDA protocol operation Backwards-Compatibility with Legacy Devices
                 draft-wu-netconf-nmda-compatibility-01

Abstract

   NMDA architectural framework eliminates the need to duplicate data
   structures to provide separate configuration and operational state
   sections and uses different datastores and new protocol operations to
   distinct configuration from operation state.  However when non-NMDA
   clients communicate with NMDA aware server, it is not clear whether
   the NMDA aware server can use existing operation to return the same
   results with <rpc-reply> as non-NMDA-aware server does.

   This document identifies some of the major challenges, and provides
   solutions that are able to mitigate those challenges and smooth the
   migration towards NMDA deployment.

Status of This Memo

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   This Internet-Draft will expire on September 10, 2019.

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   Copyright (c) 2019 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

Wu & Feng              Expires September 10, 2019               [Page 1]
Internet-Draft        NMDA Backwards-Compatibility            March 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problems  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  NMDA Client vs Non-NMDA Client  . . . . . . . . . . . . .   4
     2.2.  NETCONF Server Back-Compatibility . . . . . . . . . . . .   4
     2.3.  Feed System Configuration Back into Running Datastore . .   4
   3.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Client NMDA Support . . . . . . . . . . . . . . . . . . .   5
     3.2.  Default handling Behaviour  . . . . . . . . . . . . . . .   5
       3.2.1.  Default-Handling Basic Modes  . . . . . . . . . . . .   5
       3.2.2.  get/get-config Operation  . . . . . . . . . . . . . .   6
       3.2.3.  get-data Operation  . . . . . . . . . . . . . . . . .   7
     3.3.  Protocol Operation Clarification  . . . . . . . . . . . .   7
       3.3.1.  <get> . . . . . . . . . . . . . . . . . . . . . . . .   7
       3.3.2.  <get-config>  . . . . . . . . . . . . . . . . . . . .   7
       3.3.3.  <edit-config> . . . . . . . . . . . . . . . . . . . .   8
       3.3.4.  <get-data>  . . . . . . . . . . . . . . . . . . . . .   8
       3.3.5.  <edit-data> . . . . . . . . . . . . . . . . . . . . .   8
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   NMDA architectural framework introduces additional datastores for
   systems that support more advanced processing chains converting
   configuration to operational state.  It eliminates the need to
   duplicate data structures to provide separate configuration and
   operational state sections and uses different datastores and new
   protocol operations (e.g.,<get-data>,<edit-data> to distinct
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