Seamless Bidirectional Forwarding Detection (S-BFD)
RFC 7880

Document Type RFC - Proposed Standard (July 2016; Errata)
Updates RFC 5880
Last updated 2018-12-20
Replaces draft-akiya-bfd-seamless-base
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Dec 2015 - Submit the BFD Seaml... )
Document shepherd Jeffrey Haas
Shepherd write-up Show (last changed 2015-07-30)
IESG IESG state RFC 7880 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to aretana@cisco.com
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                      C. Pignataro
Request for Comments: 7880                                       D. Ward
Updates: 5880                                                      Cisco
Category: Standards Track                                       N. Akiya
ISSN: 2070-1721                                      Big Switch Networks
                                                               M. Bhatia
                                                          Ionos Networks
                                                           S. Pallagatti
                                                               July 2016

          Seamless Bidirectional Forwarding Detection (S-BFD)

Abstract

   This document defines Seamless Bidirectional Forwarding Detection
   (S-BFD), a simplified mechanism for using BFD with a large proportion
   of negotiation aspects eliminated, thus providing benefits such as
   quick provisioning, as well as improved control and flexibility for
   network nodes initiating path monitoring.

   This document updates RFC 5880.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7880.

Pignataro, et al.            Standards Track                    [Page 1]
RFC 7880                    Seamless BFD Base                  July 2016

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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Pignataro, et al.            Standards Track                    [Page 2]
RFC 7880                    Seamless BFD Base                  July 2016

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................4
   3. Seamless BFD Overview ...........................................6
   4. S-BFD Discriminators ............................................7
      4.1. S-BFD Discriminator Uniqueness .............................7
      4.2. Discriminator Pools ........................................7
   5. Reflector BFD Session ...........................................8
   6. State Variables .................................................9
      6.1. New State Variables ........................................9
      6.2. State Variable Initialization and Maintenance ..............9
   7. S-BFD Procedures ...............................................10
      7.1. Demultiplexing of S-BFD Control Packet ....................10
      7.2. Responder Procedures ......................................11
           7.2.1. Responder Demultiplexing ...........................11
           7.2.2. Transmission of S-BFD Control Packet by
                  SBFDReflector ......................................11
           7.2.3. Additional SBFDReflector Behaviors .................12
      7.3. Initiator Procedures ......................................13
           7.3.1. SBFDInitiator State Machine ........................14
           7.3.2. Transmission of S-BFD Control Packet by
                  SBFDInitiator ......................................15
           7.3.3. Additional SBFDInitiator Behaviors .................15
      7.4. Diagnostic Values .........................................16
      7.5. The Poll Sequence .........................................16
   8. Operational Considerations .....................................16
      8.1. Scaling Aspect ............................................17
      8.2. Congestion Considerations .................................17
   9. Co-existence with Classical BFD Sessions .......................17
   10. S-BFD Echo Function ...........................................18
   11. Security Considerations .......................................19
   12. References ....................................................20
      12.1. Normative References .....................................20
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