Bidirectional Forwarding Detection (BFD) Multipoint Active Tails
RFC 8563

Document Type RFC - Proposed Standard (April 2019; No errata)
Last updated 2019-04-02
Replaces draft-spallagatti-bfd-multipoint-active-tail
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Reshad Rahman
Shepherd write-up Show (last changed 2018-03-05)
IESG IESG state RFC 8563 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Martin Vigoureux
Send notices to Reshad Rahman <rrahman@cisco.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                           D. Katz
Request for Comments: 8563                              Juniper Networks
Category: Standards Track                                        D. Ward
ISSN: 2070-1721                                            Cisco Systems
                                                      S. Pallagatti, Ed.
                                                                  VMware
                                                          G. Mirsky, Ed.
                                                               ZTE Corp.
                                                              April 2019

    Bidirectional Forwarding Detection (BFD) Multipoint Active Tails

Abstract

   This document describes active tail extensions to the Bidirectional
   Forwarding Detection (BFD) protocol for multipoint networks.

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
   https://www.rfc-editor.org/info/rfc8563.

Copyright Notice

   Copyright (c) 2019 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
   (https://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.

Katz, et al.                 Standards Track                    [Page 1]
RFC 8563               BFD Multipoint Active Tails            April 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Acronyms  . . . . . . . . . . . . . . . . . .   3
   3.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Operational Scenarios . . . . . . . . . . . . . . . . . . . .   5
     5.1.  No Head Notification  . . . . . . . . . . . . . . . . . .   5
     5.2.  Head Notification . . . . . . . . . . . . . . . . . . . .   5
       5.2.1.  Head Notification without Polling . . . . . . . . . .   5
       5.2.2.  Head Notification and Tail Solicitation with
               Multipoint Polling  . . . . . . . . . . . . . . . . .   6
       5.2.3.  Head Notification with Composite Polling  . . . . . .   6
   6.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Multipoint Client Session . . . . . . . . . . . . . . . .   8
     6.2.  Multipoint Client Session Failure . . . . . . . . . . . .   8
     6.3.  State Variables . . . . . . . . . . . . . . . . . . . . .   8
       6.3.1.  New State Variables . . . . . . . . . . . . . . . . .   8
       6.3.2.  New State Variable Value  . . . . . . . . . . . . . .   9
       6.3.3.  State Variable Initialization and Maintenance . . . .  10
     6.4.  Controlling Multipoint BFD Options  . . . . . . . . . . .  11
     6.5.  State Machine . . . . . . . . . . . . . . . . . . . . . .  11
     6.6.  Session Establishment . . . . . . . . . . . . . . . . . .  12
     6.7.  Discriminators and Packet Demultiplexing  . . . . . . . .  12
     6.8.  Controlling Tail Packet Transmission  . . . . . . . . . .  12
     6.9.  Soliciting the Tails  . . . . . . . . . . . . . . . . . .  13
     6.10. Verifying Connectivity to Specific Tails  . . . . . . . .  13
     6.11. Detection Times . . . . . . . . . . . . . . . . . . . . .  14
     6.12. MultipointClient Down/AdminDown Sessions  . . . . . . . .  15
     6.13. Base BFD for Multipoint Networks Specification Text
           Replacement . . . . . . . . . . . . . . . . . . . . . . .  15
       6.13.1.  Reception of BFD Control Packets . . . . . . . . . .  15
       6.13.2.  Demultiplexing BFD Control Packets . . . . . . . . .  16
       6.13.3.  Transmitting BFD Control Packets . . . . . . . . . .  16
   7.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .  17
   8.  Operational Considerations  . . . . . . . . . . . . . . . . .  18
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  18
   11. Normative References  . . . . . . . . . . . . . . . . . . . .  19
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