Approaches on Supporting IOAM in IPv6
draft-song-ippm-ioam-ipv6-support-01

Document Type Active Internet-Draft (individual)
Authors Haoyu Song  , Zhenbin Li  , Shuping Peng  , Jim Guichard 
Last updated 2020-07-09
Replaces draft-song-ioam-ipv6-support
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IPPM                                                             H. Song
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                   Z. Li
Expires: January 10, 2021                                        S. Peng
                                                     Huawei Technologies
                                                             J. Guichard
                                                               Futurewei
                                                            July 9, 2020

                 Approaches on Supporting IOAM in IPv6
                  draft-song-ippm-ioam-ipv6-support-01

Abstract

   It has been proposed to encapsulate IOAM tracing option data fields
   in IPv6 HbH options header.  However, due to size of the trace data
   and the extension header location in the IPv6 packets, the proposal
   creates practical challenges for implementation, especially when
   other extension headers, such as routing header, also exist and
   require in-network processing.  We propose several alternative
   approaches to address this challenge, including separating the IOAM
   trace data to a different extension header, using the postcard-based
   telemetry (e.g., IOAM DEX) instead, and applying the segment IOAM
   trace export scheme, based on the network scenario and application
   requirements.  We discuss the pros and cons of each approach and hope
   to foster standard convergence and industry adoption.

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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Song, et al.            Expires January 10, 2021                [Page 1]
Internet-Draft              IOAM IPv6 Support                  July 2020

   This Internet-Draft will expire on January 10, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IOAM Data Separate and Postpose . . . . . . . . . . . . . . .   4
     2.1.  IOAM Trace Data Encapsulation . . . . . . . . . . . . . .   5
   3.  Segment IOAM Data Export  . . . . . . . . . . . . . . . . . .   5
     3.1.  Independent of SRv6 . . . . . . . . . . . . . . . . . . .   5
     3.2.  Export at SRv6 node . . . . . . . . . . . . . . . . . . .   6
   4.  Direct Export Option  . . . . . . . . . . . . . . . . . . . .   7
   5.  Comparison  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   In-situ OAM (IOAM) [I-D.ietf-ippm-ioam-data] defines two tracing
   options, pre-allocated tracing option and incremental tracing option,
   which record hop-by-hop data along a packet's forwarding path.  The
   draft [I-D.ietf-ippm-ioam-ipv6-options] proposes the method to
   encapsulate IOAM trace option data fields in IPv6.  Because the
   tracing options requires per hop processing, such options can only be
   encapsulated in IPv6 Hop-by-Hop (HbH) options header.  The draft
   [I-D.ioametal-ippm-6man-ioam-ipv6-deployment] further describes some
   deployment approaches.

   [RFC8200] mandates that the HbH options header, if exists, must be
   the first extension header following the IPv6 header.  However, the
   IOAM trace data can be large, which easily amount to tens to hundreds
   of bytes, making accessing other headers after it difficult.  There
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