Adaptive Subscription to YANG Notification
draft-wang-netconf-adaptive-subscription-00

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Last updated 2020-03-03
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NETCONF Working Group                                            Z. Wang
Internet-Draft                                                     Q. Wu
Intended status: Standards Track                                 W. Song
Expires: September 4, 2020                                        Huawei
                                                                 L. Geng
                                                                  P. Liu
                                                            China Mobile
                                                           March 3, 2020

               Adaptive Subscription to YANG Notification
              draft-wang-netconf-adaptive-subscription-00

Abstract

   This document defines a YANG data model and associated mechanism
   enabling subscriber's adaptive subscriptions to a publisher's event
   streams.  Applying these elements allows a subscriber to
   automatically adjust the volume of telemetry traffic sent from
   publisher to the receivers.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on September 4, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://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

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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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Model Overview  . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Bulk Subscription YANG Module . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Updates to the IETF XML Registry  . . . . . . . . . . . .   7
     4.2.  Updates to the YANG Module Names Registry . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Adaptive Subscription Example  . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   YANG-Push subscriptions [RFC8641] allow client applications to
   subscribe to continuous datastore updates without needing to poll.
   It defines a mechanism (i.e.,update trigger) to determine when an
   update record needs to be generated.  Two type of subscriptions are
   introduced in [RFC8641], distinguished by how updates are triggered:
   periodic and on-change.

   o  Periodic subscription allows subscribed data to be streamed to the
      destination at a configured fixed periodic interval

   o  On-change subscription allows update to be triggered when whenever
      a change in the subscribed information is detected.  The periodic
      interval is set to zero value in the on-change subscription case.

   However in some cases (e.g., wireless channel contention and
   interference causes the WLAN throughput and per-packet delays to vary
   over time), both collectors and publishers are configured with
   multiple periodic intervals and the subscribed data set can be
   streamed out to the destination at adaptive sampling or export rate,
   e.g., when wireless signal strength drops below a certain threshold,
   more data should be collected at high frequency.

   This document defines a YANG data model and associated mechanism
   enabling subscriber's adaptive subscriptions to a publisher's event
   streams.  Applying these elements allows a subscriber to

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