Smart Filters for Push Updates
draft-clemm-netmod-push-smart-filters-01

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Last updated 2018-10-22
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Network Working Group                                           A. Clemm
Internet-Draft                     Huawei - Futurewei Technologies, Inc.
Intended status: Standards Track                                 E. Voit
Expires: April 25, 2019                                    Cisco Systems
                                                                  X. Liu
                                                          Volta Networks
                                                              I. Bryskin
                                                                 T. Zhou
                                                                G. Zheng
                                                                  Huawei
                                                             H. Birkholz
                                                          Fraunhofer SIT
                                                        October 22, 2018

                     Smart Filters for Push Updates
                draft-clemm-netmod-push-smart-filters-01

Abstract

   This document defines a YANG model for Smart Filters for push
   updates.  Smart Filters allow to filter push updates based on values
   of pushed datastore nodes and/or state, such as previous updates.
   Smart Filters provide an important building block for service
   assurance and network automation.

   This revision of the document is intended as a placeholder,
   containing the problem statement of draft-clemm-netconf-push-smart-
   filters-ps-00 that has recently expired.  The YANG model itself still
   needs to be defined.

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
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   This Internet-Draft will expire on April 25, 2019.

Clemm, et al.            Expires April 25, 2019                 [Page 1]
Internet-Draft                smart-filter                  October 2018

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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Key Words . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   3
   4.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Smart Filter Data Model . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   YANG-Push [yang-push] allows client applications to subscribe to
   continuous datastore updates without needing to poll.  YANG-Push
   subscriptions allow client applications to select which datastore
   nodes are of interest.  For this purpose, filters that act as node
   selectors are offered.  However, what is currently not supported are
   filters that filter updates based on values, such as sending updates
   only when the value falls within a certain range.  Also not supported
   are filters that would require additional state, such as sending
   updates only when the value exceeds a certain threshold for the first
   time but not again until the threshold is cleared.  We refer to such
   filters as "Smart Filters", with further subcategories of "smart
   stateless filters" and "smart stateful filters", respectively.

   Smart Filters involve more complex subscription and implementation
   semantics than the simple selection filters that are currently
   offered as part of YANG-Push.  They involve post processing of
   updates that goes beyond basic update generation for polling
   avoidance and place additional intelligence at the server.  Because
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