Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane
draft-mirsky-spring-bfd-10

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Last updated 2020-04-26
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SPRING Working Group                                           G. Mirsky
Internet-Draft                                                 ZTE Corp.
Intended status: Standards Track                             J. Tantsura
Expires: October 28, 2020                                   Apstra, Inc.
                                                           I. Varlashkin
                                                                  Google
                                                                 M. Chen
                                                                  Huawei
                                                              J. Wenying
                                                                    CMCC
                                                          April 26, 2020

  Bidirectional Forwarding Detection (BFD) in Segment Routing Networks
                          Using MPLS Dataplane
                       draft-mirsky-spring-bfd-10

Abstract

   Segment Routing (SR) architecture leverages the paradigm of source
   routing.  It can be realized in the Multiprotocol Label Switching
   (MPLS) network without any change to the data plane.  A segment is
   encoded as an MPLS label, and an ordered list of segments is encoded
   as a stack of labels.  Bidirectional Forwarding Detection (BFD) is
   expected to monitor any existing path between systems.  This document
   defines how to use Label Switched Path Ping to bootstrap a BFD
   session, control an SR Policy in the reverse direction of the SR-MPLS
   tunnel, and applicability of BFD Demand mode in the SR-MPLS domain.
   Also, the document describes the use of BFD Echo with BFD Control
   packet payload.

Status of This Memo

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   This Internet-Draft will expire on October 28, 2020.

Mirsky, et al.          Expires October 28, 2020                [Page 1]
Internet-Draft             BFD in SPRING MPLS                 April 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   3
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  Bootstrapping BFD Session over Segment Routed Tunnel with
       MPLS Data Plane . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Use BFD Reverse Path TLV over Segment Routed MPLS Tunnel  . .   5
   4.  Use Non-FEC Path TLV  . . . . . . . . . . . . . . . . . . . .   5
   5.  BFD Reverse Path TLV over Segment Routed MPLS Tunnel with
       Dynamic Control Plane . . . . . . . . . . . . . . . . . . . .   7
   6.  Applicability of BFD Demand Mode in SR-MPLS Domain  . . . . .   7
   7.  Using BFD to Monitor Point-to-Multipoint SR Policy  . . . . .   7
   8.  Use of Echo BFD in SR-MPLS  . . . . . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Non-FEC Path TLV  . . . . . . . . . . . . . . . . . . . .   8
     9.2.  Return Code . . . . . . . . . . . . . . . . . . . . . . .   9
   10. Implementation Status . . . . . . . . . . . . . . . . . . . .  10
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  10
   12. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  11
   13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     14.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13
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