PIM DR Improvement
draft-ietf-pim-dr-improvement-07

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Last updated 2019-01-17
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PIM WG                                                      Zheng. Zhang
Internet-Draft                                               Fangwei. Hu
Intended status: Standards Track                            Benchong. Xu
Expires: July 21, 2019                                   ZTE Corporation
                                                       Mankamana. Mishra
                                                           Cisco Systems
                                                        January 17, 2019

                           PIM DR Improvement
                  draft-ietf-pim-dr-improvement-07.txt

Abstract

   Protocol Independent Multicast - Sparse Mode (PIM-SM) is widely
   deployed multicast protocol.  PIM protocol is defined in [RFC7761].
   As deployment for PIM protocol is growing day by day, user expects
   lower traffic loss and faster convergence in case of any network
   failure.  This document provides an extension to the existing
   protocol which would improve the stability of the 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.

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   This Internet-Draft will expire on July 21, 2019.

Copyright Notice

   Copyright (c) 2019 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Zhang, et al.             Expires July 21, 2019                 [Page 1]
Internet-Draft             PIM DR Improvement               January 2019

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PIM hello message format  . . . . . . . . . . . . . . . . . .   4
     3.1.  DR Address Option format  . . . . . . . . . . . . . . . .   4
     3.2.  BDR Address Option format . . . . . . . . . . . . . . . .   4
   4.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   5
     4.1.  Deployment Choice . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Election Algorithm  . . . . . . . . . . . . . . . . . . .   6
     4.3.  Sending Hello Messages  . . . . . . . . . . . . . . . . .   7
     4.4.  Receiving Hello Messages  . . . . . . . . . . . . . . . .   8
     4.5.  The treatment . . . . . . . . . . . . . . . . . . . . . .   9
     4.6.  Sender side . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Deployment suggestion . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     10.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Multicast technology is used widely.  Many modern technologies, such
   as IPTV, Net-Meeting, use PIM-SM to facilitate multicast service.
   There are many events that will influence the quality of multicast
   services.  Like the change of unicast routes, the change of the PIM-
   SM DR may cause the loss of multicast packets too.

   After a DR on a shared-media LAN goes down, other routers will elect
   a new DR after the expiration of Hello-Holdtime.  The default value
   of Hello-Holdtime is 105 seconds.  Although the minimum Hello
   interval can be adjusted to 1 second, the Hello-Holdtime is 3.5 times
   Hello interval.  Thus, the detection of DR Down event cannot be
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