Restconf and HTTP Transport for Event Notifications
draft-ietf-netconf-restconf-notif-00

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Last updated 2016-09-08
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NETCONF                                                          E. Voit
Internet-Draft                                                  A. Clemm
Intended status: Informational                               A. Tripathy
Expires: February 27, 2017                             E. Nilsen-Nygaard
                                                      A. Gonzalez Prieto
                                                           Cisco Systems
                                                         August 26, 2016

          Restconf and HTTP Transport for Event Notifications
                  draft-ietf-netconf-restconf-notif-00

Abstract

   This document defines Restconf, HTTP, and HTTP2 bindings for the
   transport Subscription requests and corresponding push updates.
   Being subscribed may be both Event Notifications and YANG Datastores.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 27, 2017.

Copyright Notice

   Copyright (c) 2016 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
   (http://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
   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.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Mechanisms for Subscription Establishment and Maintenance   4
     3.2.  Subscription Multiplexing . . . . . . . . . . . . . . . .   6
     3.3.  Push Data Stream and Transport Mapping  . . . . . . . . .   7
     3.4.  Stream Discovery  . . . . . . . . . . . . . . . . . . . .  12
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Proxy YANG Subscription when the Subscriber and
                Receiver are different . . . . . . . . . . . . . . .  15
   Appendix B.  End-to-End Deployment Guidance . . . . . . . . . . .  16
     B.1.  Call Home . . . . . . . . . . . . . . . . . . . . . . . .  16
     B.2.  TLS Heartbeat . . . . . . . . . . . . . . . . . . . . . .  16
   Appendix C.  Issues being worked and resolved . . . . . . . . . .  17
     C.1.  Unresolved Issues . . . . . . . . . . . . . . . . . . . .  17
     C.2.  Agreement in principal  . . . . . . . . . . . . . . . . .  17
     C.3.  Resolved Issues . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   Mechanisms to support Event subscription and push are defined in
   [rfc5277bis].  Enhancements to [rfc5277bis] which enable YANG
   Datastore subscription and push are defined in [yang-push].  This
   document provides a transport specification for these Restconf and
   HTTP.  This has been driven by Requirements for subscriptions to YANG
   datastores are defined in[RFC7923] .

   Beyond based transport bindings, there are benefits which can be
   realized when transporting updates directly HTTP/2[RFC7540] which can
   be realized via an implementation of this transport specification
   including:

   o  Subscription multiplexing over independent HTTP/2 streams

   o  Stream prioritization and stream dependencies

   o  Flow control on independent streams

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2.  Terminology
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