Smart filters for Push Updates - Problem Statement
draft-clemm-netconf-push-smart-filters-ps-00

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Network Working Group                                           A. Clemm
Internet-Draft                              Futurewei Technologies, Inc.
Intended status: Informational                                   E. Voit
Expires: April 21, 2018                                    Cisco Systems
                                                                  X. Liu
                                                                   Jabil
                                                              I. Bryskin
                                                                 T. Zhou
                                                                G. Zheng
                                                                  Huawei
                                                             H. Birkholz
                                                          Fraunhofer SIT
                                                        October 18, 2017

           Smart filters for Push Updates - Problem Statement
              draft-clemm-netconf-push-smart-filters-ps-00

Abstract

   This document defines a problem statement for Smart Filters for Push
   Updates.  Smart Filters for Push Updates (referred to simply as
   "Smart Filters" in the context of this document) allows to filter
   push updates based on values of pushed objects and/or state, such as
   previous updates.  Smart Filters provide an important building block
   for service assurance and network automation.

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Clemm, et al.            Expires April 21, 2018                 [Page 1]
Internet-Draft                                              October 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Key Words . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   3
   4.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

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 datanodes 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
   of this, smart filter functionality was not included in the YANG-Push
   specification, although it was recognized that YANG-Push could be

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