Seamless Bidirectional Forwarding Detection (BFD) Use Case
draft-ietf-bfd-seamless-use-case-04

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Last updated 2016-04-13 (latest revision 2016-03-21)
Replaces draft-aldrin-bfd-seamless-use-case
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Network Working Group                                          S. Aldrin
Internet-Draft                                               Google, Inc
Intended status: Informational                                 M. Bhatia
Expires: September 22, 2016                               Ionos Networks
                                                           S. Matsushima
                                                                Softbank
                                                               G. Mirsky
                                                                Ericsson
                                                                N. Kumar
                                                                   Cisco
                                                          March 21, 2016

       Seamless Bidirectional Forwarding Detection (BFD) Use Case
                  draft-ietf-bfd-seamless-use-case-04

Abstract

   This document provides various use cases for Bidirectional Forwarding
   Detection (BFD) and various requirements such that extensions could
   be developed to allow for simplified detection of forwarding
   failures.

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Copyright Notice

   Copyright (c) 2016 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Aldrin, et al.         Expires September 22, 2016               [Page 1]

Internet-Draft               S-BFD Use Case                   March 2016

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Introduction to Seamless BFD  . . . . . . . . . . . . . . . .   3
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Unidirectional Forwarding Path Validation . . . . . . . .   4
     3.2.  Validation of forwarding path prior to traffic switching    5
     3.3.  Centralized Traffic Engineering . . . . . . . . . . . . .   6
     3.4.  BFD in Centralized Segment Routing  . . . . . . . . . . .   6
     3.5.  Efficient BFD Operation Under Resource Constraints  . . .   7
     3.6.  BFD for Anycast Address . . . . . . . . . . . . . . . . .   7
     3.7.  BFD Fault Isolation . . . . . . . . . . . . . . . . . . .   7
     3.8.  Multiple BFD Sessions to Same Target  . . . . . . . . . .   8
     3.9.  MPLS BFD Session Per ECMP Path  . . . . . . . . . . . . .   8
   4.  Detailed Requirements . . . . . . . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Bidirectional Forwarding Detection (BFD) is a lightweight protocol,
   as defined in [RFC5880], used to detect forwarding failures.  Various
   protocols and applications rely on BFD for failure detection.  Even
   though the protocol is simple, there are certain use cases, where
   faster setting up of sessions and continuity check of the data
   forwarding paths is necessary.  This document identifies various use
   cases and requirements related to those, such that necessary
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