Performance Measurement Using TWAMP Light for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-10

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Document Type Active Internet-Draft (individual)
Authors Rakesh Gandhi  , Clarence Filsfils  , Daniel Voyer  , Mach Chen  , Bart Janssens 
Last updated 2020-08-06 (latest revision 2020-06-05)
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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Informational                       Cisco Systems, Inc.
Expires: February 7, 2021                                       D. Voyer
                                                             Bell Canada
                                                                 M. Chen
                                                                  Huawei
                                                             B. Janssens
                                                                    Colt
                                                          August 6, 2020

 Performance Measurement Using TWAMP Light for Segment Routing Networks
                   draft-gandhi-spring-twamp-srpm-10

Abstract

   Segment Routing (SR) leverages the source routing paradigm.  SR is
   applicable to both Multiprotocol Label Switching (SR-MPLS) and IPv6
   (SRv6) data planes.  This document describes procedure for sending
   and processing probe query and response messages for Performance
   Measurement (PM) in Segment Routing networks.  The procedure uses the
   messages defined in RFC 5357 (Two-Way Active Measurement Protocol
   (TWAMP) Light) for Delay Measurement, and uses the messages defined
   in this document for Loss Measurement.  The procedure described is
   applicable to SR-MPLS and SRv6 data planes and is used for both Links
   and end-to-end SR Paths including SR Policies.

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
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   This Internet-Draft will expire on February 7, 2021.

Gandhi, et al.          Expires February 7, 2021                [Page 1]
Internet-Draft       TWAMP Light for Segment Routing         August 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Reference Topology  . . . . . . . . . . . . . . . . . . .   4
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Example Provisioning Model  . . . . . . . . . . . . . . .   6
   4.  Probe Messages  . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Probe Query Message . . . . . . . . . . . . . . . . . . .   7
       4.1.1.  Delay Measurement Query Message . . . . . . . . . . .   7
       4.1.2.  Loss Measurement Query Message  . . . . . . . . . . .   8
       4.1.3.  Probe Query for Links . . . . . . . . . . . . . . . .   9
       4.1.4.  Probe Query for SR Policy . . . . . . . . . . . . . .   9
       4.1.5.  Control Code Field Extension for TWAMP Light Messages  11
       4.1.6.  Loss Measurement Query Message Extensions . . . . . .  12
     4.2.  Probe Response Message  . . . . . . . . . . . . . . . . .  15
       4.2.1.  One-way Measurement Mode  . . . . . . . . . . . . . .  16
       4.2.2.  Two-way Measurement Mode  . . . . . . . . . . . . . .  16
       4.2.3.  Loss Measurement Response Message Extensions  . . . .  18
     4.3.  Additional Probe Message Processing Rules . . . . . . . .  20
       4.3.1.  TTL and Hop Limit . . . . . . . . . . . . . . . . . .  21
       4.3.2.  Router Alert Option . . . . . . . . . . . . . . . . .  21
       4.3.3.  UDP Checksum  . . . . . . . . . . . . . . . . . . . .  21
   5.  Performance Measurement for P2MP SR Policies  . . . . . . . .  21
   6.  ECMP Support for SR Policies  . . . . . . . . . . . . . . . .  22
   7.  Performance Delay and Liveness Monitoring . . . . . . . . . .  23
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