In-band Performance Measurement Using TWAMP for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-00

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Last updated 2019-02-09
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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended Status: Standards Track                     Cisco Systems, Inc.
Expires: August 13, 2019                                        D. Voyer
                                                             Bell Canada
                                                        February 9, 2019

               In-band Performance Measurement Using TWAMP
                       for Segment Routing Networks
                    draft-gandhi-spring-twamp-srpm-00

Abstract

   Segment Routing (SR) is applicable to both Multiprotocol Label
   Switching (SR-MPLS) and IPv6 (SRv6) data planes.  This document
   specifies procedures for sending and processing in-band probe query
   and response messages for Performance Measurement.  The procedure
   uses the mechanisms defined in RFC 5357 (Two-Way Active Measurement
   Protocol (TWAMP)) for Delay Measurement, and also uses the mechanisms
   for direct-mode loss measurement defined in this document.  The
   procedure specified is applicable to SR-MPLS and SRv6 data planes for
   both links and end-to-end measurement for SR Policies.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Gandhi, et al.          Expires August 13, 2019                 [Page 1]
Internet-Draft         TWAMP for Segment Routing        February 9, 2019

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
     2.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
     2.2.  Abbreviations  . . . . . . . . . . . . . . . . . . . . . .  3
     2.3.  Reference Topology . . . . . . . . . . . . . . . . . . . .  4
     2.4.  In-band Probe Messages . . . . . . . . . . . . . . . . . .  5
   3.  Probe Messages . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Probe Query Message  . . . . . . . . . . . . . . . . . . .  5
       3.1.1.  Delay Measurement Probe Query Message  . . . . . . . .  5
       3.1.2.  Loss Measurement Probe Query Message . . . . . . . . .  6
       3.1.3.  Probe Query for SR Links . . . . . . . . . . . . . . . 10
       3.1.4.  Probe Query for End-to-end Measurement for SR Policy . 11
         3.1.4.1.  Probe Query Message for SR-MPLS Policy . . . . . . 11
         3.1.4.2.  Probe Query Message for SRv6 Policy  . . . . . . . 11
     3.2.  Probe Response Message . . . . . . . . . . . . . . . . . . 12
       3.2.1.  One-way Measurement  . . . . . . . . . . . . . . . . . 12
       3.2.2.  Two-way Measurement  . . . . . . . . . . . . . . . . . 12
         3.2.2.1.  Probe Response Message for SR-MPLS Policy  . . . . 13
         3.2.2.2.  Probe Response Message for SRv6 Policy . . . . . . 13
   4.  Packet Loss Calculation  . . . . . . . . . . . . . . . . . . . 13
   5.  Performance Measurement for P2MP SR Policies . . . . . . . . . 14
   6.  ECMP Support . . . . . . . . . . . . . . . . . . . . . . . . . 14
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 15
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 15
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 18
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18

1.  Introduction
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