Enhanced Performance Delay and Liveness Monitoring in Segment Routing Networks
draft-gandhi-spring-sr-enhanced-plm-01

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Document Type Active Internet-Draft (individual)
Authors Rakesh Gandhi  , Clarence Filsfils  , Navin Vaghamshi  , Moses Nagarajah 
Last updated 2020-06-05 (latest revision 2020-03-05)
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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: December 7, 2020                                   N. Vaghamshi
                                                                Reliance
                                                            M. Nagarajah
                                                                 Telstra
                                                            June 5, 2020

 Enhanced Performance Delay and Liveness Monitoring in Segment Routing
                                Networks
                 draft-gandhi-spring-sr-enhanced-plm-01

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 defines procedure for Performance
   Delay and Liveness Monitoring (PDLM) in Segment Routing networks.
   The procedure uses the probe messages defined in RFC 5357 (Two-Way
   Active Measurement Protocol (TWAMP) Light) and RFC 8762 (Simple Two-
   Way Active Measurement Protocol (STAMP)) for SR Paths including SR
   Policies with both SR-MPLS and SRv6 data planes.

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gandhi, et al.          Expires December 7, 2020                [Page 1]
Internet-Draft  Performance and Liveness Monitoring in SR      June 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Reference Topology  . . . . . . . . . . . . . . . . . . .   5
     2.4.  Loopback Mode . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Probe Messages  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Example Provisioning Model  . . . . . . . . . . . . . . .   6
   4.  Performance Delay and Liveness Monitoring . . . . . . . . . .   6
     4.1.  Probe Message for SR-MPLS . . . . . . . . . . . . . . . .   7
     4.2.  Probe Message for SRv6  . . . . . . . . . . . . . . . . .   8
   5.  Enhanced Performance Delay and Liveness Monitoring  . . . . .   9
     5.1.  Loopback Mode Enabled with Network Programming  . . . . .   9
     5.2.  Probe Message with Network Programming for SR-MPLS  . . .  10
       5.2.1.  Node Capability for Timestamp Label . . . . . . . . .  11
       5.2.2.  Timestamp Label Allocation  . . . . . . . . . . . . .  11
     5.3.  Probe Message with Network Programming for SRv6 . . . . .  12
   6.  ECMP Handling . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Failure Notification  . . . . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Segment Routing (SR) leverages the source routing paradigm and
   greatly simplifies network operations for Software Defined Networks
   (SDNs).  SR is applicable to both Multiprotocol Label Switching (SR-
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