IPv6 Options for Congestion Measurement
draft-shi-ippm-congestion-measurement-ipv6-options-00

IP Performance Measurement                                   H. Shi, Ed.
Internet-Draft                                                   T. Zhou
Intended status: Standards Track                                  Huawei
Expires: 5 September 2024                                         Y. Liu
                                                                  M. Han
                                                            China Unicom
                                                            4 March 2024

                IPv6 Options for Congestion Measurement
         draft-shi-ippm-congestion-measurement-ipv6-options-00

Abstract

   The Congestion Measurement enables precise congestion control, aids
   in effective load balancing, and simplifies network debugging by
   accurately reflecting the degree of congestion across network paths.
   This document outlines how Congestion Measurement Data-Fields are
   encapsulated in IPv6.

Status of This Memo

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   This Internet-Draft will expire on 5 September 2024.

Copyright Notice

   Copyright (c) 2024 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Congestion Measurement Option . . . . . . . . . . . . . . . .   2
     2.1.  Congestion Measurement Hop-by-hop Options Header (HBH)  .   3
     2.2.  Congestion Measurement Destination Options Header
           (DOH) . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   [I-D.draft-shi-ippm-congestion-measurement-data] defines data fields
   of Congestion Measurement which enables sender to obtain the degree
   of congestion across the path.  This document defines the IPv6
   encapsulation of the Congestion Measurement Data-Fields.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Congestion Measurement Option

   One IPv6 header option, Congestion Measurement Option is defined to
   carry the Congestion Measurement Data-Fields.

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    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   |Opt Type = TBD1|  Opt Data Len |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   .                                                               .
   .        Congestion Measurement Data-Fields (Variable)          .
   .                                                               .
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                  Figure 1: Congestion Measurement Option

   where:

   *  Opt Type: Type value is TBD1, an 8-bit unsigned integer.
      Identifier of the type of this Congestion Measurement Option.

   *  Opt Data Len: An 8-bit unsigned integer.  Length of the Option
      Data field of this option, that is, length of the Congestion
      Measurement Data-Fields.

   *  Congestion Measurement Data-Fields: Option-Type-specific data.  It
      carries the data fields for Congestion Measurement as specified in
      [I-D.draft-shi-ippm-congestion-measurement-data].

2.1.  Congestion Measurement Hop-by-hop Options Header (HBH)

   The Congestion Measurement option can be carried in the IPv6 Hop-by-
   Hop Options Header.  In this case, each node along the path can
   inspect the Congestion Info Data field if they are configured the
   support this option.  If the U bit of Congestion Measurement Data-
   Fields is set, intermediate nodes will modify the Congestion Info
   Data field accordingly.In theory, the presence of the Hop-by-Hop
   Option should not affect the traffic throughput both on nodes that do
   not recognize this Option and on the nodes that support it.  However,
   in a real implementation, a packet with a Hop-by-hop Option may be
   skipped or processed in the slow path.  Proposals to mitigate the
   problem are out of the scope for this document.

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2.2.  Congestion Measurement Destination Options Header (DOH)

   The Congestion Measurement option can be carried in the IPv6
   Destination Options Header.  In this case, it is usually processed by
   the destination node.  Note that, if there is also a Routing Header
   (RH), any visited destination in the route list can process it.  If
   the U bit of Congestion Measurement Data-Fields is set, intermediate
   nodes will modify the Congestion Info Data field accordingly.

3.  Security Considerations

   TBD.

4.  IANA Considerations

   IANA is requested to assign an IPv6 Header Option as follows:

           +=======+===============================+===========+
           | Value | Description                   | Reference |
           +=======+===============================+===========+
           | TBD1  | Congestion Measurement Option | Section 2 |
           +-------+-------------------------------+-----------+

                                  Table 1

5.  References

5.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/rfc/rfc2119>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.

5.2.  Informative References

   [I-D.draft-shi-ippm-congestion-measurement-data]
              Shi, H., Zhou, T., and Z. Li, "Data Fields for Congestion
              Measurement", Work in Progress, Internet-Draft, draft-shi-
              ippm-congestion-measurement-data-00, 3 March 2024,
              <https://datatracker.ietf.org/doc/html/draft-shi-ippm-
              congestion-measurement-data-00>.

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Authors' Addresses

   Hang Shi (editor)
   Huawei
   Beijing
   China
   Email: shihang9@huawei.com

   Tianran Zhou
   Huawei
   Beijing
   China
   Email: zhoutianran@huawei.com

   Ying Liu
   China Unicom
   Beijing
   China
   Email: liuy619@chinaunicom.cn

   Mengyao Han
   China Unicom
   Beijing
   China
   Email: hanmy12@chinaunicom.cn

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