Micro-burst Decreasing in Layer3 Network for Low-Latency Traffic
draft-du-detnet-layer3-low-latency-02

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Network Working Group                                              Z. Du
Internet-Draft                                                    P. Liu
Intended status: Informational                              China Mobile
Expires: August 26, 2021                               February 22, 2021

    Micro-burst Decreasing in Layer3 Network for Low-Latency Traffic
                 draft-du-detnet-layer3-low-latency-02

Abstract

   This document introduces the problem of micro-bursts in layer3
   network, and proposed a method to decrease the micro-bursts in layer3
   network for low-latency traffic.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 26, 2021.

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   Copyright (c) 2021 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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   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Gaps for Large-scale Layer 3 Deterministic Network  . . . . .   3
   3.  Rethinking the Problem in IP Forwarding . . . . . . . . . . .   3
   4.  Method to Decrease Micro-bursts . . . . . . . . . . . . . . .   5
     4.1.  Working Flow of the Method  . . . . . . . . . . . . . . .   5
     4.2.  Process of Edge Node  . . . . . . . . . . . . . . . . . .   5
     4.3.  Process of Forwarding Node  . . . . . . . . . . . . . . .   6
   5.  Analysis of the Proposed Method . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The DetNet architecture in RFC 8655 [RFC8655] is supposed to work in
   campus-wide networks and private WANs, including the large-scale ISP
   network scenario, such as the 5G bearing network mentioned in RFC
   8578 [RFC8578].  It is essential for the large-scale ISP network to
   be able to provide the low-latency service.  The low-latency
   requirement exists in both L2 and L3 networks, and in both small and
   large networks.

   However, as talked in [I-D.qiang-detnet-large-scale-detnet],
   deploying deterministic services in a large-scale network brings a
   lot of new challenges.  A novel method called LDN (Large-scale
   Deterministic Network) is introduced in
   [I-D.qiang-detnet-large-scale-detnet], which explores the
   deterministic forwarding over a large-scale network.

   This document also explores the deterministic service in the large-
   scale layer 3 network, and proposed a method based on micro-burst
   decreasing, which can benefit the forwarding of low-latency traffic
   in a large-scale network.

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2.  Gaps for Large-scale Layer 3 Deterministic Network

   According to RFC 8655 [RFC8655], DetNet operates at the IP layer and
   delivers service over lower-layer technologies such as MPLS and IEEE
   802.1 Time-Sensitive Networking (TSN).  However, the TSN mechanisms