BFD for Multipoint Networks
draft-ietf-bfd-multipoint-07

Document Type Active Internet-Draft (bfd WG)
Last updated 2015-08-19
Stream IETF
Intended RFC status Proposed Standard
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Internet Engineering Task Force                                  D. Katz
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                                 D. Ward
Expires: February 19, 2016                                 Cisco Systems
                                                      S. Pallagatti, Ed.
                                                        Juniper Networks
                                                         August 18, 2015

                      BFD for Multipoint Networks
                      draft-ietf-bfd-multipoint-07

Abstract

   This document describes extensions to the Bidirectional Forwarding
   Detection (BFD) protocol for its use in multipoint and multicast
   networks.  Comments on this draft should be directed to rtg-
   bfd@ietf.org.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 19, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Katz, et al.            Expires February 19, 2016               [Page 1]
Internet-Draft         BFD for Multipoint Networks           August 2015

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Multipoint BFD Control Packets  . . . . . . . . . . . . .   4
     4.2.  Session Model . . . . . . . . . . . . . . . . . . . . . .   4
     4.3.  Session Failure Semantics . . . . . . . . . . . . . . . .   5
     4.4.  State Variables . . . . . . . . . . . . . . . . . . . . .   5
       4.4.1.  New State Variables . . . . . . . . . . . . . . . . .   5
       4.4.2.  State Variable Initialization and Maintenance . . . .   6
     4.5.  State Machine . . . . . . . . . . . . . . . . . . . . . .   6
     4.6.  Session Establishment . . . . . . . . . . . . . . . . . .   7
     4.7.  Discriminators and Packet Demultiplexing  . . . . . . . .   7
     4.8.  Packet consumption on tails . . . . . . . . . . . . . . .   8
     4.9.  Bringing Up and Shutting Down Multipoint BFD Service  . .   8
     4.10. Timer Manipulation  . . . . . . . . . . . . . . . . . . .   8
     4.11. Detection Times . . . . . . . . . . . . . . . . . . . . .   9
     4.12. State Maintenance for Down/AdminDown Sessions . . . . . .   9
       4.12.1.  MultipointHead Sessions  . . . . . . . . . . . . . .   9
       4.12.2.  MultipointTail Sessions  . . . . . . . . . . . . . .   9
     4.13. Base Specification Text Replacement . . . . . . . . . . .  10
       4.13.1.  Reception of BFD Control Packets . . . . . . . . . .  10
       4.13.2.  Demultiplexing BFD Control Packets . . . . . . . . .  12
       4.13.3.  Transmitting BFD Control Packets . . . . . . . . . .  13
   5.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .  16
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  17
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
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