UDP Options for Bounded Latency
draft-qiang-tsvwg-udp-options-bounded-latency-00

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

                    UDP Options for Bounded Latency
            draft-qiang-tsvwg-udp-options-bounded-latency-00

Abstract

   This document explores the use of UDP options for packet forwarding
   with bounded latency.

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 September 9, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Qiang & Eckert          Expires September 9, 2019               [Page 1]
Internet-Draft       UDP Options for Bounded Latency          March 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology & Abbreviations . . . . . . . . . . . . . . .   3
   2.  Overview of Bounded Latency Forwarding Schemes  . . . . . . .   3
     2.1.  Time Aware Shaping  . . . . . . . . . . . . . . . . . . .   3
     2.2.  Cyclic Queuing and Forwarding . . . . . . . . . . . . . .   4
     2.3.  Scalable Deterministic Forwarding (SDF) . . . . . . . . .   5
     2.4.  SR based Bounded Latency  . . . . . . . . . . . . . . . .   6
     2.5.  Other Bounded Latency Forwarding Schemes  . . . . . . . .   6
   3.  UDP Option Extension for Bounded Latency Forwarding . . . . .   6
     3.1.  Sending Cycle Option  . . . . . . . . . . . . . . . . . .   7
     3.2.  UDP Option for Other Purposes . . . . . . . . . . . . . .   7
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   More and more applications require for deterministic forwarding as
   summarized in [draft-ietf-detnet-use-cases].  Deterministic
   forwarding refers to the packet forwarding with bounded latency, as
   well as low packet loss.  In current DetNet's discussion, low packet
   loss is mainly achieved through PREOF (Packet Replication,
   Elimination, and Ordering Functions)
   [draft-ietf-detnet-architecture].  Supporting PREOF through UDP
   options is out of this document's scope.  This document only explores
   the use of UDP options for bounded latency forwarding purposes.

   A lot of bounded latency forwarding schemes have been proposed such
   as Time Aware Shaping [IEEE802.1Qbv], Cyclic Queuing and Forwarding
   [IEEE802.1Qch], Scalable Deterministic Forwarding
   [draft-qiang-detnet-large-scale-detnet], and SR based bounded latency
   [draft-chen-detnet-sr-based-bounded-latency].  These schemes require
   more or less specific information, whether configured through control
   plane or carried in data plane.  In MPLS data plane, there is enough
   space in MPLS Label to carry information for bounded latency
   forwarding.  However in an IP data plane, there is no enough space in
   the IP common header.  To that aim, UDP options
   [draft-ietf-tsvwg-udp-options] are an interesting channel to
   investigate.

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1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
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