PIM DR Improvement
draft-ietf-pim-dr-improvement-00

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PIM WG                                                      Zheng. Zhang
Internet-Draft                                               Fangwei. Hu
Intended status: Standards Track                            BenChong. Xu
Expires: September 2, 2016                               ZTE Corporation
                                                           March 1, 2016

                           PIM DR Improvement
                  draft-ietf-pim-dr-improvement-00.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.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 2, 2016.

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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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

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

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.  Except
   the unicast routes changing 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  |
                  -------                             -------
                     |                                   |
                   Figure 1: An example of multicast network

   For example, there were two routers on one Ethernet.  RouterA was
   elected to DR.  When RouterA is down, the multicast packets are

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