Performance Measurement Using TWAMP Light for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-08

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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Informational                       Cisco Systems, Inc.
Expires: September 24, 2020                                     D. Voyer
                                                             Bell Canada
                                                                 M. Chen
                                                                  Huawei
                                                             B. Janssens
                                                                    Colt
                                                          March 23, 2020

 Performance Measurement Using TWAMP Light for Segment Routing Networks
                   draft-gandhi-spring-twamp-srpm-08

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 specifies 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 specified is
   applicable to SR-MPLS and SRv6 data planes and is used for both Links
   and end-to-end SR Policies.

Status of This Memo

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   This Internet-Draft will expire on September 24, 2020.

Gandhi, et al.         Expires September 24, 2020               [Page 1]
Internet-Draft       TWAMP Light for Segment Routing          March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Reference Topology  . . . . . . . . . . . . . . . . . . .   5
   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 End-to-end Measurement for SR Policy    9
       4.1.5.  Control Code Field for TWAMP Light Messages . . . . .  10
       4.1.6.  Loss Measurement Query Message Formats for TWAMP
               Light . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.2.  Probe Response Message  . . . . . . . . . . . . . . . . .  14
       4.2.1.  One-way Measurement Mode  . . . . . . . . . . . . . .  15
       4.2.2.  Two-way Measurement Mode  . . . . . . . . . . . . . .  15
       4.2.3.  Loopback Measurement Mode . . . . . . . . . . . . . .  17
       4.2.4.  Loss Measurement Response Message Formats for TWAMP
               Light . . . . . . . . . . . . . . . . . . . . . . . .  17
   5.  Performance Measurement for P2MP SR Policies  . . . . . . . .  19
   6.  ECMP Support for SR Policies  . . . . . . . . . . . . . . . .  20
   7.  Additional Message Processing Rules . . . . . . . . . . . . .  20
     7.1.  TTL and Hop Limit . . . . . . . . . . . . . . . . . . . .  21
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