Bidirectional Forwarding Detection (BFD) for Multi-point Networks and Protocol Independent Multicast - Sparse Mode (PIM-SM) Use Case
draft-mirsky-pim-bfd-p2mp-use-case-00

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Last updated 2018-02-15
Replaced by draft-ietf-pim-bfd-p2mp-use-case
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PIM Working Group                                              G. Mirsky
Internet-Draft                                                 ZTE Corp.
Updates: 7761 (if approved)                                    J. Xiaoli
Intended status: Standards Track                         ZTE Corporation
Expires: August 19, 2018                               February 15, 2018

 Bidirectional Forwarding Detection (BFD) for Multi-point Networks and
     Protocol Independent Multicast - Sparse Mode (PIM-SM) Use Case
                 draft-mirsky-pim-bfd-p2mp-use-case-00

Abstract

   This document discusses use of Bidirectional Forwarding Detection
   (BFD) for multi-point networks to provide nodes that participate in
   Protocol Independent Multicast - Sparse Mode (PIM-SM) over shared-
   media segment with sub-second convergence of the Designated Router
   and defines the extension to bootstrap point-to-multipoint BFD
   session.  Optional extension to PIM-SM Hello, as defined in RFC 7761,
   also defined in this document.

Status of This Memo

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   This Internet-Draft will expire on August 19, 2018.

Copyright Notice

   Copyright (c) 2018 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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Mirsky & Xiaoli          Expires August 19, 2018                [Page 1]
Internet-Draft           BFD P2MP Use in PIM-SM            February 2018

   to this document.  Code Components extracted from this document must
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability of p2mp BFD . . . . . . . . . . . . . . . . . .   3
     3.1.  Multipoint BFD Encapsulation  . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC7761] is the current specification of the Protocol Independent
   Multicast - Sparse Mode (PIM-SM) for IPv4 and IPv6 networks.
   Confirming implementation of PIM-SM elects a Designated Router (DR)
   on each PIM-SM interface.  When a group of PIM-SM nodes are connected
   to shared-media segment, e.g.  Ethernet, the one elected as DR is to
   act on behalf of directly connected hosts in context of the PIM-SM
   protocol.  Failure of the DR impacts quality of the multicast
   services it provides to directly connected hosts because the default
   failure detection interval for PIM-SM routers is 105 seconds.
   Introduction of Backup DR (BDR), proposed in
   [I-D.ietf-pim-dr-improvement] improves convergence time in the PIM-SM
   over shared-media segment but still depends on long failure detection
   interval.

   Bidirectional Forwarding Detection (BFD) [RFC5880] had been
   originally defined to detect failure of point-to-point (p2p) paths -
   single-hop [RFC5881], multihop [RFC5883].  [I-D.ietf-bfd-multipoint]
   extends [RFC5880] for multipoint and multicast networks, which
   precisely characterizes deployment scenarios for PIM-SM over LAN
   segment.  This document demonstrates how point-to-multipoint (p2mp)
   BFD can enable faster detection of PIM-SM DR and BDR failure and thus
   minimize multicast service disruption.  The document also defines the
   extension to PIM-SM [RFC7761] to bootstrap a PIM-SM router to join in
   p2mp BFD session over shared-media link.
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