PIM flooding mechanism and source discovery
draft-ietf-pim-source-discovery-bsr-05

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Document Type Active Internet-Draft (pim WG)
Last updated 2016-10-31
Replaces draft-wijnands-pim-source-discovery-bsr
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Network Working Group                                       IJ. Wijnands
Internet-Draft                                                 S. Venaas
Intended status: Experimental                        Cisco Systems, Inc.
Expires: May 4, 2017                                             M. Brig
                                                Aegis BMD Program Office
                                                             A. Jonasson
                           Swedish Defence Material Administration (FMV)
                                                        October 31, 2016

              PIM flooding mechanism and source discovery
                 draft-ietf-pim-source-discovery-bsr-05

Abstract

   PIM Sparse-Mode uses a Rendezvous Point and shared trees to forward
   multicast packets from new sources.  Once last hop routers receive
   packets from a new source, they may join the Shortest Path Tree for
   the source for optimal forwarding.  This draft defines a new protcol
   that provides a way to support PIM Sparse Mode (SM) without the need
   for PIM registers, RPs or shared trees.  Multicast source information
   is flooded throughout the multicast domain using a new generic PIM
   flooding mechanism.  This allows last hop routers to learn about new
   sources without receiving initial data packets.

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on May 4, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Wijnands, et al.           Expires May 4, 2017                  [Page 1]
Internet-Draft PIM flooding mechanism and source discovery  October 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Testing and deployment experiences  . . . . . . . . . . . . .   3
   3.  A generic PIM flooding mechanism  . . . . . . . . . . . . . .   4
     3.1.  PFM message format  . . . . . . . . . . . . . . . . . . .   4
     3.2.  Processing PFM messages . . . . . . . . . . . . . . . . .   5
       3.2.1.  Initial checks  . . . . . . . . . . . . . . . . . . .   5
       3.2.2.  Processing and forwarding of PFM messages . . . . . .   6
   4.  Distributing Source to Group Mappings . . . . . . . . . . . .   6
     4.1.  Group Source Holdtime TLV . . . . . . . . . . . . . . . .   6
     4.2.  Originating PFM messages  . . . . . . . . . . . . . . . .   7
     4.3.  Processing GSH TLVs . . . . . . . . . . . . . . . . . . .   8
     4.4.  The first packets and bursty sources  . . . . . . . . . .   8
     4.5.  Resiliency to network partitioning  . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   6.  IANA considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   PIM Sparse-Mode uses a Rendezvous Point (RP) and shared trees to
   forward multicast packets to Last Hop Routers (LHR).  After the first
   packet is received by a LHR, the source of the multicast stream is
   learned and the Shortest Path Tree (SPT) can be joined.  This draft
   defines a new mechanism that provides a way to support PIM Sparse
   Mode (SM) without the need for PIM registers, RPs or shared trees.
   Multicast source information is flooded throughout the multicast
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