Performance Measurement for Segment Routing Networks with MPLS Data Plane
draft-gandhi-mpls-rfc6374-sr-01

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MPLS Working Group                                        R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended Status: Standards Track                     Cisco Systems, Inc.
Expires: June 6, 2020                                           D. Voyer
                                                             Bell Canada
                                                              S. Salsano
                                        Universita di Roma "Tor Vergata"
                                                                 M. Chen
                                                                  Huawei
                                                        December 4, 2019

                      Performance Measurement for
              Segment Routing Networks with MPLS Data Plane
                    draft-gandhi-mpls-rfc6374-sr-01

Abstract

   Segment Routing (SR) leverages the source routing paradigm.  RFC 6374
   specifies protocol mechanisms to enable the efficient and accurate
   measurement of packet loss, one-way and two-way delay, as well as
   related metrics such as delay variation in MPLS networks using probe
   messages.  This document utilizes these mechanisms for Performance
   Delay and Loss Measurements in Segment Routing (SR) networks with
   MPLS data plane (SR-MPLS), for both SR links and end-to-end SR
   Policies.  In addition, this document defines Return Path TLV for
   two-way performance measurement and Block Number TLV for loss
   measurement.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   material or to cite them other than as "work in progress."

Copyright Notice

 

Gandhi, et al.            Expires June 6, 2020                  [Page 1]
Internet-Draft            RFC 6374 for SR-MPLS          December 4, 2019

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

   This document is subject to BCP 78 and the IETF Trust's Legal
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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.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Probe Query and Response Packets . . . . . . . . . . . . . . .  6
     4.1.  Probe Packet Header for SR-MPLS Policies . . . . . . . . .  6
     4.2.  Probe Packet Header for SR-MPLS Links  . . . . . . . . . .  7
     4.3.  Probe Response Message for SR-MPLS Links and Policies  . .  7
       4.3.1.  One-way Measurement Mode . . . . . . . . . . . . . . .  7
       4.3.2.  Two-way Measurement Mode . . . . . . . . . . . . . . .  7
       4.3.3.  Loopback Measurement Mode  . . . . . . . . . . . . . .  8
     4.4.  Return Path TLV  . . . . . . . . . . . . . . . . . . . . .  8
   5.  Performance Delay Measurement  . . . . . . . . . . . . . . . .  9
     5.1.  Delay Measurement Message Format . . . . . . . . . . . . .  9
     5.2.  Timestamps . . . . . . . . . . . . . . . . . . . . . . . . 10
   6.  Performance Loss Measurement . . . . . . . . . . . . . . . . . 10
     6.1.  Loss Measurement Message Format  . . . . . . . . . . . . . 11
     6.2.  Block Number TLV . . . . . . . . . . . . . . . . . . . . . 11
   7.  Performance Measurement for P2MP SR Policies . . . . . . . . . 11
   8.  ECMP for SR-MPLS Policies  . . . . . . . . . . . . . . . . . . 12
   9.  SR Link Extended TE Metrics Advertisements . . . . . . . . . . 13
   10.  Security Considerations . . . . . . . . . . . . . . . . . . . 13
   11.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13