PIM DR Improvement
draft-ietf-pim-dr-improvement-02

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Last updated 2016-12-05
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PIM WG                                                      Zheng. Zhang
Internet-Draft                                               Fangwei. Hu
Intended status: Standards Track                            BenChong. Xu
Expires: June 8, 2017                                    ZTE Corporation
                                                        December 5, 2016

                           PIM DR Improvement
                  draft-ietf-pim-dr-improvement-02.txt

Abstract

   PIM is worldly deployed multicast protocol.  This document will
   improve the stability of PIM protocol, decrease the lost of multicast
   packets when the PIM DR (Designed Router) is down.

Status of This Memo

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

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   This Internet-Draft will expire on June 8, 2017.

Copyright Notice

   Copyright (c) 2016 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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Zhang, et al.             Expires June 8, 2017                  [Page 1]
Internet-Draft             PIM DR Improvement              December 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PIM hello message format  . . . . . . . . . . . . . . . . . .   3
     3.1.  DR Address Option format  . . . . . . . . . . . . . . . .   3
     3.2.  BDR Address Option format . . . . . . . . . . . . . . . .   4
   4.  The Protocol Treatment  . . . . . . . . . . . . . . . . . . .   4
     4.1.  Election Algorithm  . . . . . . . . . . . . . . . . . . .   5
     4.2.  Sending Hello Messages  . . . . . . . . . . . . . . . . .   6
     4.3.  Receiving Hello Messages  . . . . . . . . . . . . . . . .   6
     4.4.  The treatment . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Deployment suggestion . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Multicast technology is used widely.  Many modern technology use PIM
   technology, such as IPTV, Net-Meeting, and so on.  There are many
   events that will influence the quality of multicast services.  The
   change of unicast routes will cause the lost of multicast packets.
   The change of DR cause the lost of multicast packets too.

   When a DR on a share-media LAN is down, other routers will elect a
   new DR until the expiration of Hello-Holdtime.  The default value of
   Hello-Holdtime is 105 seconds.  Although the value of Hello-Holdtime
   can be changed by manual, when the DR is down, there are still many
   multicast packets will be lost.  The quality of IPTV and Net-Meeting
   will be influenced.

                   \                                     /
                    \                                   /
                  -------                             -------
                  |  A  |                             |  B  |
                  -------                             -------
                     | DR                                |
                     |                                   |
                  -------                             -------
                  | SW  |-----------------------------| SW  |
                  -------                             -------
                     |                                   |
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