UDP Path for In-band Performance Measurement for Segment Routing Networks
draft-gandhi-spring-udp-pm-01

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Last updated 2018-06-09
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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended Status: Standards Track                                 S. Soni
Expires: December 11, 2018                           Cisco Systems, Inc.
                                                                D. Voyer
                                                             Bell Canada
                                                              S. Salsano
                                        Universita di Roma "Tor Vergata"
                                                            P. L. Ventre
                                                                    CNIT
                                                            June 9, 2018

                          UDP Path for In-band 
          Performance Measurement for Segment Routing Networks
                     draft-gandhi-spring-udp-pm-01

Abstract

   Segment Routing (SR) is applicable to both Multiprotocol Label
   Switching (SR-MPLS) and IPv6 (SRv6) data planes.  This document
   specifies a procedure for using UDP path for sending and processing
   in-band probe query and response messages for Performance Measurement
   (PM).  The procedure uses the RFC 6374 defined mechanisms for Delay
   and Loss performance measurement.  The procedure specified is
   applicable to IPv4, IPv6, SR-MPLS, and SRv6 data planes for both
   links and end-to-end measurement for SR Policies.  This document also
   defines mechanisms for handling Equal Cost Multipaths (ECMPs) for SR
   Policies.  In addition, this document defines new Return Path Segment
   List TLV for two-way performance measurement.

Status of This Memo

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Gandhi, et al.         Expires December 11, 2018                [Page 1]
Internet-Draft    UDP Path for PM for Segment Routing       June 9, 2018

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  4
     2.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
     2.2.  Abbreviations  . . . . . . . . . . . . . . . . . . . . . .  4
     2.3.  Reference Topology . . . . . . . . . . . . . . . . . . . .  5
   3.  Probe Messages . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Probe Query Message  . . . . . . . . . . . . . . . . . . .  6
       3.1.1.  Delay Measurement Probe Query Message  . . . . . . . .  6
       3.1.2.  Loss Measurement Probe Query Message . . . . . . . . .  6
         3.1.2.1.  Loss Measurement Flags . . . . . . . . . . . . . .  7
       3.1.3.  In-band Probe Query for SR Links . . . . . . . . . . .  7
       3.1.4.  In-band Probe Query for End-to-end Measurement of SR
               Policy . . . . . . . . . . . . . . . . . . . . . . . .  8
         3.1.4.1.  In-band Probe Query Message for SR-MPLS Policy . .  8
         3.1.4.2.  In-band Probe Query Message for SRv6 Policy  . . .  8
     3.2.  Probe Response Message . . . . . . . . . . . . . . . . . .  8
       3.2.1.  One-way Measurement for SR Link and end-to-end SR 
               Policy . . . . . . . . . . . . . . . . . . . . . . . . 10
         3.2.1.1.  Probe Response Message to Controller . . . . . . . 10
       3.2.2.  Two-way Measurement for SR Links . . . . . . . . . . . 10
       3.2.3.  Two-way End-to-end Measurement of SR Policy  . . . . . 10
         3.2.3.1.  Return Path Segment List TLV . . . . . . . . . . . 10
         3.2.3.2.  In-band Probe Response Message for SR-MPLS
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