Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane
draft-mirsky-spring-bfd-06

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SPRING Working Group                                           G. Mirsky
Internet-Draft                                                 ZTE Corp.
Intended status: Standards Track                             J. Tantsura
Expires: February 24, 2019                                Nuage Networks
                                                           I. Varlashkin
                                                                  Google
                                                                 M. Chen
                                                                  Huawei
                                                         August 23, 2018

  Bidirectional Forwarding Detection (BFD) in Segment Routing Networks
                          Using MPLS Dataplane
                       draft-mirsky-spring-bfd-06

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 path in reverse direction of the SR-MPLS tunnel and
   applicability of BFD Demand mode in the SR-MPLS domain.

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Mirsky, et al.          Expires February 24, 2019               [Page 1]
Internet-Draft             BFD in SPRING MPLS                August 2018

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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 . . . . . . . . . . . . . . . . . . . . . . .   3
   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.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Non-FEC Path TLV  . . . . . . . . . . . . . . . . . . . .   7
     7.2.  Return Code . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   [RFC5880], [RFC5881], and [RFC5883] defined the operation of
   Bidirectional Forwarding Detection (BFD) protocol between the two
   systems over IP networks.  [RFC5884] and [RFC7726] set rules for
   using BFD Asynchronous mode over point-to-point (p2p) Multiprotocol
   Label Switching (MPLS) Label Switched Path (LSP).  These latter
   standards implicitly assume that the egress BFD peer, which is the
   egress Label Edge Router (LER), will use the shortest path route

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