PIM DR Improvement
draft-ietf-pim-dr-improvement-08

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Last updated 2019-08-15
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PIM WG                                                      Zheng. Zhang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                             Fangwei. Hu
Expires: February 16, 2020                                    Individual
                                                            Benchong. Xu
                                                         ZTE Corporation
                                                       Mankamana. Mishra
                                                           Cisco Systems
                                                         August 15, 2019

                           PIM DR Improvement
                  draft-ietf-pim-dr-improvement-08.txt

Abstract

   Protocol Independent Multicast - Sparse Mode (PIM-SM) is widely
   deployed multicast protocol.  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 role changes.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on February 16, 2020.

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

Zhang, et al.           Expires February 16, 2020               [Page 1]
Internet-Draft             PIM DR Improvement                August 2019

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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.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  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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