Large-Scale Deterministic IP Network
draft-qiang-detnet-large-scale-detnet-04

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Network Working Group                                      L. Qiang, Ed.
Internet-Draft                                                   X. Geng
Intended status: Informational                                    B. Liu
Expires: September 9, 2019                                T. Eckert, Ed.
                                                                  Huawei
                                                                 L. Geng
                                                            China Mobile
                                                           March 8, 2019

                  Large-Scale Deterministic IP Network
                draft-qiang-detnet-large-scale-detnet-04

Abstract

   This document presents the overall framework and key method for
   Large-scale Deterministic Network (LDN).  LDN can provide bounded
   latency and delay variation (jitter) without requiring precise time
   synchronization among nodes, or per-flow state in transit nodes.

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   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 9, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology & Abbreviations . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Summary . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Background  . . . . . . . . . . . . . . . . . . . . . . .   4
       2.2.1.  Deterministic End-to-End Latency  . . . . . . . . . .   4
       2.2.2.  Hop-by-Hop Delay  . . . . . . . . . . . . . . . . . .   4
       2.2.3.  Cyclic Forwarding . . . . . . . . . . . . . . . . . .   5
       2.2.4.  Co-Existence with Non-Deterministic Traffic . . . . .   6
     2.3.  System Components . . . . . . . . . . . . . . . . . . . .   6
   3.  LDN Forwarding Mechanism  . . . . . . . . . . . . . . . . . .   7
     3.1.  Cyclic Queues . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Cycle Mapping . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Performance Analysis  . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Queueing Delay  . . . . . . . . . . . . . . . . . . . . .  11
     4.2.  Jitter  . . . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   This document explores the DetNet forwarding over large-scale
   network.  In contrast to TSN that deployed in LAN, DetNet is expected
   to be deployed in larger scale network that has the following
   features:

   o  a large number of network devices

   o  the distance between two network devices is long

   o  a lot of deterministic flows on the network

   These above features will bring the following challenges to DetNet
   forwarding:

   o  difficult to achieve precise time synchronization among all nodes

   o  long link propagation delay may introduce bigger jitter

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   o  per-flow state is un-scalable

   Motivated by these challenges, this document presents a Large-scale
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