Seamless Bidirectional Forwarding Detection (BFD) Use Case
draft-ietf-bfd-seamless-use-case-03

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Document Type Active Internet-Draft (bfd WG)
Last updated 2016-02-23 (latest revision 2015-07-31)
Replaces draft-aldrin-bfd-seamless-use-case
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Stream WG state Submitted to IESG for Publication (wg milestone: Dec 2014 - Submit the BFD Seaml... )
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Network Working Group                                          S. Aldrin
Internet-Draft                                               Google, Inc
Intended status: Informational                                 M. Bhatia
Expires: February 1, 2016                                 Ionos Networks
                                                           S. Matsushima
                                                                Softbank
                                                               G. Mirsky
                                                                Ericsson
                                                                N. Kumar
                                                                   Cisco
                                                           July 31, 2015

       Seamless Bidirectional Forwarding Detection (BFD) Use Case
                  draft-ietf-bfd-seamless-use-case-03

Abstract

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

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   Copyright (c) 2015 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Aldrin, et al.          Expires February 1, 2016                [Page 1]

Internet-Draft               S-BFD Use Case                    July 2015

   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   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 . . . . . . . . . . . . .   5
     3.4.  BFD in Centralized Segment Routing  . . . . . . . . . . .   6
     3.5.  BFD Efficient Operation Under Resource Constraints  . . .   6
     3.6.  BFD for Anycast Address . . . . . . . . . . . . . . . . .   7
     3.7.  BFD Fault Isolation . . . . . . . . . . . . . . . . . . .   7
     3.8.  Multiple BFD Sessions to Same Target  . . . . . . . . . .   7
     3.9.  MPLS BFD Session Per ECMP Path  . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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 and lightweight, there are certain use
   cases, where faster setting up of sessions and continuity check of
   the data forwarding paths is necessary.  This document identifies use
   cases such that necessary enhancements could be made to BFD protocol
   to meet those requirements.

   BFD was designed to be a lightweight "Hello" protocol to detect data
   plane failures.  With dynamic provisioning of forwarding paths on a
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