Enhanced Performance and Liveness Monitoring in Segment Routing Networks
draft-gandhi-spring-sr-enhanced-plm-00

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SPRING Working Group                                      R. Gandhi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: September 6, 2020                                  N. Vaghamshi
                                                                Reliance
                                                            M. Nagarajah
                                                                 Telstra
                                                           March 5, 2020

Enhanced Performance and Liveness Monitoring in Segment Routing Networks
                 draft-gandhi-spring-sr-enhanced-plm-00

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 Enhanced
   Performance and Liveness Monitoring (PLM) in Segment Routing
   networks.  The procedure uses the probe messages defined in RFC 5357
   (Two-Way Active Measurement Protocol (TWAMP) Light) as well as STAMP
   and is applicable to both SR-MPLS and SRv6 data planes.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of

Gandhi, et al.          Expires September 6, 2020               [Page 1]
Internet-Draft  Performance and Liveness Monitoring in SR     March 2020

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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
   3.  Liveness Monitoring . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Loopback Mode for SR-MPLS . . . . . . . . . . . . . . . .   5
     3.2.  Loopback Mode for SRv6  . . . . . . . . . . . . . . . . .   6
   4.  Enhanced Performance and Liveness Monitoring  . . . . . . . .   7
     4.1.  Loopback Mode Enabled with Network Programming for SR-
           MPLS  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  Node Capability for Timestamp Label . . . . . . . . .   9
     4.2.  Loopback Mode Enabled with Network Programming for SRv6 .   9
   5.  ECMP Handling . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

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-
   MPLS) and IPv6 (SRv6) data planes [RFC8402].  SR takes advantage of
   the Equal-Cost Multipaths (ECMPs) between source and transit nodes,
   between transit nodes and between transit and destination nodes.  SR
   Policies as defined in [I-D.ietf-spring-segment-routing-policy] are
   used to steer traffic through a specific, user-defined paths using a
   stack of Segments.  Built-in Liveness Monitoring for detecting faults
   as well as Performance Delay and Loss Monitoring are essential
   requirements to provide Service Level Agreements (SLAs) in SR
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