PIM DR Improvement
draft-ietf-pim-dr-improvement-03

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Last updated 2017-06-06
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PIM WG                                                      Zheng. Zhang
Internet-Draft                                               Fangwei. Hu
Intended status: Standards Track                            BenChong. Xu
Expires: December 8, 2017                                ZTE Corporation
                                                Mankamana. Prasad Mishra
                                                           Cisco Systems
                                                            June 6, 2017

                           PIM DR Improvement
                  draft-ietf-pim-dr-improvement-03.txt

Abstract

   PIM is widely deployed multicast protocol.  PIM protocol is defined
   in [RFC4601] and [RFC7761].  As deployment for PIM protocol growing
   day by day, user expect least traffic loss and fast convergence in
   case of any network failure.  This document provides extension to
   existing defined protocol which would improve stability of PIM
   protocol with respect to traffic loss and convergence time when the
   PIM DR 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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

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

Copyright Notice

   Copyright (c) 2017 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PIM hello message format  . . . . . . . . . . . . . . . . . .   3
     3.1.  DR Address Option format  . . . . . . . . . . . . . . . .   4
     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  . . . . . . . . . . . . . . . .   7
     4.4.  The treatment . . . . . . . . . . . . . . . . . . . . . .   8
     4.5.  Sender side . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Deployment suggestion . . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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.

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