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Network Working Group                                       D. Dang, Ed.
Internet-Draft                                                    Huawei
Intended status: Informational                                   W. Wang
Expires: May 7, 2020                                       China Telecom
                                                                  W. LEE
                                                                   LG U+
                                                        November 4, 2019


               Multi-Path Concurrent Measurement for IPPM
              draft-dang-ippm-multiple-path-measurement-02

Abstract

   This test method can test multi-paths concurrently from one edge node
   to another edge node.  This document details Multi-Path Concurrent
   Measurement (MPCM).

Status of This Memo

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   This Internet-Draft will expire on May 7, 2020.

Copyright Notice

   Copyright (c) 2019 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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   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology & Abbreviations . . . . . . . . . . . . . . .   3
   2.  Overview of MPCM  . . . . . . . . . . . . . . . . . . . . . .   4
   3.  MPCM-Test Packet Format and Content . . . . . . . . . . . . .   4
   4.  Expansion based on various measurement methods  . . . . . . .   7
     4.1.  IOAM  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Data Export . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   As we know, the current network has been already being in load
   balancing mode, however it is partially congested.  In other words,
   from the same source node to the same destination node, some paths
   have been congested to cause a decline in service quality, but some
   paths carry less traffic and are lightly loaded.  To solve the
   problem of unbalanced network load[draft-liu-ican], the first is to
   have the ability to detect the quality of the load sharing paths.
   And then the traffic from the Scr node to the Dst node is required to
   be steered from the congested paths into the lightly loaded path/
   paths basing on the SLA's requirement.  So it's necessary to measure
   the multi-paths in load-balancing mode.

   In the traditional method, the paths are measured separately because
   they aren't maintained by the path group.  If the multiple load
   sharing paths are required to be selected based on the SLA
   information, the measured SLA information needs to be comparable.  If
   you want to ensure that the data obtained by the test is available
   and accurate, the multi-paths are required to maintain by the path
   group in order that the test start and end points must be same.

   For example, the low latency services require millisecond delays.  If
   the start time and the end time aren't same, the measured data may
   not be in one test cycle, and the accuracy of this data is relatively
   low and the data cannot be comparedFigure 1.






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            Path1
      +-+-+-+-+-+-+-+-+
      |               |
      +-+-+-+-+-+-+-+-+

                                   Path2
                             +-+-+-+-+-+-+-+-+
                             |               |
                             +-+-+-+-+-+-+-+-+

                    Path3
             +-+-+-+-+-+-+-+-+
             |               |
             +-+-+-+-+-+-+-+-+

 -----------------------------------------------------------------------
  0                                           t

              Figure 1: Measured Data in the Different Cycles

   The Multi-Path Concurrent Measurement (MPCM) is required, which can
   be used bi-directionally to concurrently measure multi-paths metrics
   between two network elements.  At the same time, this method also
   consider saving the number of test messages to reduces the load on
   the network.

1.1.  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.

1.2.  Terminology & Abbreviations

   o  Muti-paths

      *  There are multiple paths between two nodes in the network.
         These paths may be equal-cost multi-path (ECMP) mode or
         unequal-cost multiple (UCMP) mode.  In a real network, they
         might be one [draft-ietf-spring-segment-routing-policy] or
         [RFC7348] tunnel group.

   o  Concurrent

      *  In order to ensure comparability between multiple paths, the
         test start point and the test end point are required to be
         same.




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2.  Overview of MPCM

   The Multi-Path Concurrent Measurement (MPCM) is the way of
   measurement of multi-paths metrics.

   MPCM can be embedded into a variety of transports such as NSH,
   Segment Routing, VxLAN, native IPv6 (via extension header), or IPv4.

3.  MPCM-Test Packet Format and Content

   This section defines path header and associated data types required
   for MPCM.

   Firstly one path packet formatFigure 2 of multi-path can be defined.

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             Session ID                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Path ID            |         Path-E2E-Type         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Flags   |          Transaction ID                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                        Figure 2: MPCM Path header

   o  Session ID: A set of load sharing paths

   o  Path ID: One path of the session.

   o  Path-E2E-Type: A 16-bit identifier which Indicates whether the
      packet type is a send message or a request message.

   o  Flags: 8-bit field.  Identify the query or response type.
      Following flags are defined:

      *  Bit 0 Identify the query type

      *  Bit 1 Identify the response type

      *  Reserved

   o  Transaction ID: 16-bit identifier of one measurement transaction.
      The sender and receiver to identify measurement transactions based
      on Transaction ID.





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   When a measurement is for a set of paths, each query message is made
   for each path, but only one unified response message repliesFigure 3.

      Sender                                  Receiver
        |                                        |
        |        Query message of Path1          |
        | -------------------------------------->|
        |        Query message of Path2          |
        |--------------------------------------->|
        |                  ...                   |
        |                  ...                   |
        |        Query message of PathN          |
        |--------------------------------------->|
        |                                        |
        |                                        |
        |                                        |
        |                                        |
        |                                        |
        |  Response message of All multi-paths   |
        |<---------------------------------------|
        |                                        |
        |                                        |

                   Figure 3: Query and Response message

   The measurement response packet format of a path is as
   followsFigure 4.

      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                E2E PathN Option Header                        |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |             PathN Edge-to-Edge Option Data                    |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                          Figure 4: Query message

   The field of PathN Edge-to-Edge Option Data can refer to Edge-to-Edge
   Option Data of [draft-ietf-ippm-ioam-data-04].

   It suppose there are N paths between two points.The measurement
   response packet format of multi-paths is as followsFigure 4.






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      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                E2E Path1 Option Header                        |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |             Path1 Edge-to-Edge Option Data                    |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
      ~                             ...                               ~
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
      |                                                               |
      |                E2E PathN-1 Option Header                      |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |             PathN-1 Edge-to-Edge Option Data                  |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                  E2E PathN Option Header                      |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |               PathN Edge-to-Edge Option Data                  |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                        Figure 5: Response message

   o  Long-term measurement

      *  The receiver can wait until it receives all measurement
         requests of a set of path and then responds.

   o  Short-term measurement

      *  The Sender can query once t.

      *  The receiver can reply once t.

   The overall solution needs to consider two methods of long-period
   measurement and short-period measurement.








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4.  Expansion based on various measurement methods

   The measurement message format defined by this document can be
   extended based on various measurement methods.

4.1.  IOAM

   A new type may be added in IOAM-E2E-Type of IOAM Edge-to-Edge Option
   header[draft-ietf-ippm-ioam-data-04-section4.4] as follow.

   o  Bit 4: Multiple paths measurement.

   This bit is set by the headend node if Multi-Path Concurrent
   Measurement is activated.

   A common registry is maintained for IOAM-Types, see Section 6.

   For path-based quality measurements, there is no need to measure each
   message because the large-scale deployment consumes too much network
   resources.  Here, the way of periodic measurement is recommended.In a
   period, if there is a packet, the appropriate packet is selected to
   be inserted into the iOAM packet; if there is no packet, a
   measurement packet is directly generated[draft-dang-ippm-congestion].

5.  Data Export

   MPCM nodes collect information for packets traversing a domain that
   supports MPCM.  MPCM process the information further and export the
   information using e.g., IPFIX.  Raw data export of IOAM data using
   IPFIX is discussed in [draft-spiegel-ippm-ioam-rawexport-00].

6.  IANA Considerations

   This document requests the following IANA Actions.

   IOAM E2E Type Registry:

   Bit 4 Multiple ways measurement

7.  Security Considerations

   The Proof of Transit option (Section Section 4.3 In-situ OAM
   [draft-ietf-ippm-ioam-data-04-section4.4]) is used for verifying the
   path of data packets.







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8.  Acknowledgements

   TBD

9.  Normative References

   [draft-dang-ippm-congestion]
              "A One-Path Congestion Metric for IPPM",
              <https://tools.ietf.org/html/draft-dang-ippm-congestion-
              02>.

   [draft-ietf-ippm-ioam-data-04]
              "A Variety of Transports",
              <https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-
              data/>.

   [draft-ietf-ippm-ioam-data-04-section4.4]
              "IOAM Edge-to-Edge Option",
              <https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-
              data/>.

   [draft-ietf-spring-segment-routing-policy]
              "Segment Routing Policy Architecture",
              <https://tools.ietf.org/html/draft-ietf-spring-segment-
              routing-policy-02>.

   [draft-liu-ican]
              "Instant Congestion Assessment Network (iCAN) for Traffic
              Engineering", <https://tools.ietf.org/html/draft-dang-
              ippm-congestion-02>.

   [draft-spiegel-ippm-ioam-rawexport-00]
              "In-situ OAM raw data export with IPFIX",
              <https://tools.ietf.org/html/draft-spiegel-ippm-ioam-
              rawexport-00>.

   [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/info/rfc2119>.

   [RFC7348]  "Virtual eXtensible Local Area Network (VXLAN)",
              <https://datatracker.ietf.org/doc/rfc7348/>.








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Authors' Addresses

   Joanna Dang (editor)
   Huawei
   Beijing
   China

   Email: dangjuanna@huawei.com


   Jianglong
   China Telecom
   Beijing
   China

   Email: wangjl50@chinatelecom.cn


   Shinyoung
   LG U+
   Seoul
   Korea

   Email: leesy@lguplus.co.kr



























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