Deterministic Networking Problem Statement
RFC 8557

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Internet Engineering Task Force (IETF)                           N. Finn
Request for Comments: 8557                   Huawei Technologies Co. Ltd
Category: Informational                                       P. Thubert
ISSN: 2070-1721                                                    Cisco
                                                                May 2019

               Deterministic Networking Problem Statement

Abstract

   This paper documents the needs in various industries to establish
   multi-hop paths for characterized flows with deterministic
   properties.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8557.

Copyright Notice

   Copyright (c) 2019 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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Finn & Thubert                Informational                     [Page 1]
RFC 8557       Deterministic Networking Problem Statement       May 2019

Table of Contents

   1. Introduction ....................................................2
   2. On Deterministic Networking .....................................4
   3. Problem Statement ...............................................6
      3.1. Supported Topologies .......................................6
      3.2. Flow Characterization ......................................6
      3.3. Centralized Path Computation and Installation ..............7
      3.4. Distributed Path Setup .....................................8
      3.5. Duplicated Data Format .....................................8
   4. Security Considerations .........................................9
   5. IANA Considerations .............................................9
   6. Informative References .........................................10
   Acknowledgments ...................................................11
   Authors' Addresses ................................................11

1.  Introduction

   "Deterministic Networking Use Cases" [RFC8578] illustrates that
   beyond the classical case of Industrial Automation and Control
   Systems (IACSs) there are in fact multiple industries with strong,
   and relatively similar, needs for deterministic network services with
   latency guarantees and ultra-low packet loss.

   The generalization of the needs for more deterministic networks has
   led to the IEEE 802.1 Audio Video Bridging (AVB) Task Group becoming
   the Time-Sensitive Networking (TSN) [IEEE-802.1TSNTG] Task Group
   (TG), with a much-expanded constituency from the industrial and
   vehicular markets.

   Along with this expansion, the networks considered here are becoming
   larger and structured, requiring deterministic forwarding beyond the
   LAN boundaries.  For instance, an IACS segregates the network along
   the broad lines of the Purdue Enterprise Reference Architecture
   (PERA) [ISA95], typically using deterministic LANs for Purdue level 2
   control systems, whereas public infrastructures such as electricity
   automation require deterministic properties over the wide area.
   Implementers have come to realize that the convergence of IT and
   Operation Technology (OT) networks requires Layer 3, as well as
   Layer 2, capabilities.

   While the initial user base has focused almost entirely on Ethernet
   physical media and Ethernet-based bridging protocols from several
   Standards Development Organizations (SDOs), the need for Layer 3, as
   expressed above, must not be confined to Ethernet and Ethernet-like
   media.  While such media must be encompassed by any useful
   Deterministic Networking (DetNet) architecture, cooperation between
   the IETF and other SDOs must not be limited to the IEEE or the

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RFC 8557       Deterministic Networking Problem Statement       May 2019