Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router (DR) Improvement
draft-ietf-pim-dr-improvement-10

Document Type Active Internet-Draft (pim WG)
Authors Zheng Zhang  , fangwei hu  , BenChong Xu  , Mankamana Mishra 
Last updated 2020-10-16 (latest revision 2020-09-30)
Replaces draft-zhang-pim-dr-improvement
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PIM WG                                                          Z. Zhang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                                   F. Hu
Expires: April 3, 2021                                        Individual
                                                                   B. Xu
                                                         ZTE Corporation
                                                               M. Mishra
                                                           Cisco Systems
                                                      September 30, 2020

Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router
                            (DR) Improvement
                    draft-ietf-pim-dr-improvement-10

Abstract

   Protocol Independent Multicast - Sparse Mode (PIM-SM) is a widely
   deployed multicast protocol.  As deployment for the PIM protocol is
   growing day by day, a user expects lower packet loss and faster
   convergence regardless of the cause of the network failure.  This
   document defines an extension to the existing protocol, which
   improves the PIM protocol's stability with respect to packet loss and
   convergence time when the PIM Designated Router (DR) role changes.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on April 3, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zhang, et al.             Expires April 3, 2021                 [Page 1]
Internet-Draft             PIM DR Improvement             September 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   4
     3.1.  Election Algorithm  . . . . . . . . . . . . . . . . . . .   5
     3.2.  Sending Hello Messages  . . . . . . . . . . . . . . . . .   5
     3.3.  Receiving Hello Messages  . . . . . . . . . . . . . . . .   6
     3.4.  Working with the DRLB function  . . . . . . . . . . . . .   6
   4.  PIM Hello message format  . . . . . . . . . . . . . . . . . .   7
     4.1.  DR Address Option format  . . . . . . . . . . . . . . . .   7
     4.2.  BDR Address Option format . . . . . . . . . . . . . . . .   7
     4.3.  Error handling  . . . . . . . . . . . . . . . . . . . . .   7
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Multicast technology, with PIM-SM ([RFC7761]), is used widely in
   modern services like IPTV and Net-Meeting.  Some events, such as
   changes in unicast routes, or a change in the PIM-SM DR, may cause
   the loss of multicast packets.

   The PIM DR has two responsibilities in the PIM-SM protocol.  For any
   active sources on a LAN, the PIM DR is responsible for registering
   with the Rendezvous Point (RP) if the group is operating in PIM-SM.
   Also, the PIM DR is responsible for tracking local multicast
   listeners and forwarding data to these listeners if the group is
   operating in PIM-SM.
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