Micro-burst Decreasing in Layer3 Network for Low-Latency Traffic
draft-du-detnet-layer3-low-latency-00

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Network Working Group                                              Z. Du
Internet-Draft                                                    P. Liu
Intended status: Standards Track                                 L. Geng
Expires: September 10, 2020                                 China Mobile
                                                           March 9, 2020

    Micro-burst Decreasing in Layer3 Network for Low-Latency Traffic
                 draft-du-detnet-layer3-low-latency-00

Abstract

   This document introduces 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.

   Internet-Drafts are working documents of the Internet Engineering
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   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.

   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
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Table of Contents

   1.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Mechanism to Decrease Micro-bursts  . . . . . . . . . . . . .   3
     2.1.  Process of Edge Node  . . . . . . . . . . . . . . . . . .   3
     2.2.  Process of Forwarding Node  . . . . . . . . . . . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Problem Statement

   Currently, the DetNet architecture in RFC 8655 [RFC8655] is supposed
   to work in campus-wide networks and private WANs, and hasn't covered
   the large-scale ISP network scenario.  However, the low-latency
   requirement exists in both L2 and L3 networks, and in both small and
   large networks.

   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 is introduced in
   [I-D.qiang-detnet-large-scale-detnet], which explores the
   deterministic forwarding over a large-scale 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
   are designed for L2 network originally, and cannot be directly used
   in the large-scale layer 3 network because of various reasons.  For
   example, some TSN mechanisms need synchronization of the network
   equipments, which is easier in a small network, but hard in a large
   network; some mechanisms need a per-flow state in the forwarding
   plane, which is un-scalable; and some TSN mechanisms need a constant
   and forecastable traffic characteristics, which is more complicated
   in a large network where much more flows exist and the traffic
   characteristics is more dynamic.

   The current forwarding mechanism in an IP router is based on
   statistical multiplexing, and cannot provide the deterministic

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   service because of various reasons.  Even be given a high priority, a