SRv6 In-situ Active Measurement
draft-song-spring-siam-00

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SPRING                                                           H. Song
Internet-Draft                                    Futurewei Technologies
Intended status: Standards Track                                  T. Pan
Expires: June 18, 2021                                              BUPT
                                                       December 15, 2020

                    SRv6 In-situ Active Measurement
                       draft-song-spring-siam-00

Abstract

   This draft describes an in-band active measurement method for SRv6.
   A probing packet contains an SRH with a flag bit set.  The IOAM
   header and data are encapsulated in UDP payload.  The probing packet
   originates from a segment source node and terminates at a configured
   segment endpoint node.  Each segment node on the path, when detecting
   the flag, parses the UDP header and the IOAM header, and adds data to
   the IOAM node data fields.  Multiple applications can be supported by
   the method.

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.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 18, 2021.

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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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  In-situ Active Measurement for SRv6 . . . . . . . . . . . . .   3
   3.  Network Operation . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Applications  . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Probing Packet Type Extension . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   To support SRv6 network operation, we need various means to collect
   data and measure the performance of SRv6 network.
   [I-D.ietf-6man-spring-srv6-oam] provides some mechanisms for SRv6
   OAM.  Some other general methods for performance measurement such as
   [RFC8762] can also be applied for SRv6.  However, these methods have
   limited data coverage and measurement capability.

   [I-D.ietf-ippm-ioam-data] supports extensible data collection for
   user traffic.  It is beneficial for SRv6 network monitor and
   measurement.  [I-D.ali-spring-ioam-srv6] proposes to encapsulate IOAM
   in SRH TLV.  However, IOAM's overhead may cause packet fragmentation
   and its processing may affect the packet forwarding throughput.
   Moreover, due to the extension header limitations asserted by
   [RFC8200], it is not easy to come up with a scheme to encapsulate the
   IOAM header and data in other locations in SRv6 user packets.

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   Fortunately, the forwarding behavior in SRv6 networks is determined
   by the SRH.  The IOAM header and data do not need to be added to user