Performance Measurement Using TWAMP for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-01

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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended Status: Standards Track                     Cisco Systems, Inc.
Expires: November 16, 2019                                      D. Voyer
                                                             Bell Canada
                                                                 M. Chen
                                                                  Huawei
                                                            May 15, 2019

                   Performance Measurement Using TWAMP
                       for Segment Routing Networks 
                    draft-gandhi-spring-twamp-srpm-01

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 synthetic probe query
   and response messages for Performance Measurement (PM).  The
   procedure uses the mechanisms defined in RFC 5357 (Two-Way Active
   Measurement Protocol (TWAMP)) for Delay Measurement, and also uses
   the mechanisms specified in this document for direct-mode Loss
   Measurement.  The procedure specified is applicable to SR-MPLS and
   SRv6 data planes for both links and end-to-end measurement for SR
   Policies.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

 

Gandhi, et al.         Expires November 16, 2019                [Page 1]
Internet-Draft         TWAMP for Segment Routing            May 15, 2019

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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.  Probe Messages . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Probe Query Message  . . . . . . . . . . . . . . . . . . .  5
       3.1.1.  Delay Measurement Probe Query Message  . . . . . . . .  6
         3.1.1.1.  Delay Measurement Message Checksum Complement  . .  6
         3.1.1.2.  Delay Measurement Authentication Mode  . . . . . .  7
       3.1.2.  Loss Measurement Probe Query Message . . . . . . . . .  7
         3.1.2.1.  Loss Measurement Message Checksum Complement . . . 10
         3.1.2.2.  Loss Measurement Authentication Mode . . . . . . . 10
       3.1.3.  Probe Query for SR Links . . . . . . . . . . . . . . . 10
       3.1.4.  Probe Query for End-to-end Measurement for SR Policy . 10
         3.1.4.1.  Probe Query Message for SR-MPLS Policy . . . . . . 10
         3.1.4.2.  Probe Query Message for SRv6 Policy  . . . . . . . 11
     3.2.  Probe Response Message . . . . . . . . . . . . . . . . . . 12
       3.2.1.  One-way Measurement Mode . . . . . . . . . . . . . . . 14
       3.2.2.  Two-way Measurement Mode . . . . . . . . . . . . . . . 15
         3.2.2.1.  Return Path TLV  . . . . . . . . . . . . . . . . . 15
         3.2.2.2.  Probe Response Message for SR-MPLS Policy  . . . . 16
         3.2.2.3.  Probe Response Message for SRv6 Policy . . . . . . 17
       3.2.3.  Loopback Measurement Mode  . . . . . . . . . . . . . . 17
   4.  Packet Loss Calculation  . . . . . . . . . . . . . . . . . . . 17
   5.  Performance Measurement for P2MP SR Policies . . . . . . . . . 18
   6.  ECMP Support for SR Policies . . . . . . . . . . . . . . . . . 18
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 19