Service Assurance for Intent-based Networking Architecture
draft-claise-opsawg-service-assurance-architecture-02

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OPSAWG                                                         B. Claise
Internet-Draft                                               J. Quilbeuf
Intended status: Informational                       Cisco Systems, Inc.
Expires: September 10, 2020                                  Y. El Fathi
                                                Orange Business Services
                                                                D. Lopez
                                                          Telefonica I+D
                                                                D. Voyer
                                                             Bell Canada
                                                           March 9, 2020

       Service Assurance for Intent-based Networking Architecture
         draft-claise-opsawg-service-assurance-architecture-02

Abstract

   This document describes an architecture for Service Assurance for
   Intent-based Networking (SAIN).  This architecture aims at assuring
   that service instances are correctly running.  As services rely on
   multiple sub-services by the underlying network devices, getting the
   assurance of a healthy service is only possible with a holistic view
   of network devices.  This architecture not only helps to correlate
   the service degradation with the network root cause but also the
   impacted services when a network component fails or degrades.

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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   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 September 10, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Claise, et al.         Expires September 10, 2020               [Page 1]
Internet-DraService Assurance for Intent-based Networking Ar  March 2020

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Decomposing a Service Instance Configuration into an
           Assurance Graph . . . . . . . . . . . . . . . . . . . . .   9
     3.2.  Intent and Assurance Graph  . . . . . . . . . . . . . . .  10
     3.3.  Subservices . . . . . . . . . . . . . . . . . . . . . . .  11
     3.4.  Building the Expression Graph from the Assurance Graph  .  11
     3.5.  Building the Expression from a Subservice . . . . . . . .  12
     3.6.  Open Interfaces with YANG Modules . . . . . . . . . . . .  12
     3.7.  Handling Maintenance Windows  . . . . . . . . . . . . . .  13
     3.8.  Flexible Architecture . . . . . . . . . . . . . . . . . .  14
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   6.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Changes between revisions  . . . . . . . . . . . . .  17
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   SAIN Agent: Component that communicates with a device, a set of
   devices, or another agent to build an expression graph from a