Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router (DR) Improvement
draft-ietf-pim-dr-improvement-11

Document Type Active Internet-Draft (pim WG)
Authors Zheng Zhang  , fangwei hu  , BenChong Xu  , Mankamana Mishra 
Last updated 2021-02-17
Replaces draft-zhang-pim-dr-improvement
Stream Internent Engineering Task Force (IETF)
Intended RFC status Proposed Standard
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Stream WG state WG Document
Revised I-D Needed - Issue raised by AD
On Agenda pim at IETF-110
Document shepherd Stig Venaas
Shepherd write-up Show (last changed 2019-10-27)
IESG IESG state AD is watching
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Consensus Boilerplate Yes
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Responsible AD Alvaro Retana
Send notices to Stig Venaas <stig@venaas.com>, aretana.ietf@gmail.com
PIM WG                                                          Z. Zhang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                                   F. Hu
Expires: August 21, 2021                                      Individual
                                                                   B. Xu
                                                         ZTE Corporation
                                                               M. Mishra
                                                           Cisco Systems
                                                       February 17, 2021

Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router
                            (DR) Improvement
                    draft-ietf-pim-dr-improvement-11

Abstract

   Protocol Independent Multicast - Sparse Mode (PIM-SM) is a widely
   deployed multicast protocol.  As deployment for the PIM protocol is
   growing day by day, a user expects lower packet loss and faster
   convergence regardless of the cause of the network failure.  This
   document defines an extension to the existing protocol, which
   improves the PIM's stability with respect to packet loss and
   convergence time when the PIM Designated Router (DR) role changes.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://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 August 21, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zhang, et al.            Expires August 21, 2021                [Page 1]
Internet-Draft             PIM DR Improvement              February 2021

   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
   carefully, as they describe your rights and restrictions with respect
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   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
     1.1.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   4
     3.1.  Election Algorithm  . . . . . . . . . . . . . . . . . . .   5
     3.2.  Sending Hello Messages  . . . . . . . . . . . . . . . . .   7
     3.3.  Receiving Hello Messages  . . . . . . . . . . . . . . . .   8
     3.4.  Working with the DRLB function  . . . . . . . . . . . . .   8
   4.  PIM Hello message format  . . . . . . . . . . . . . . . . . .   8
     4.1.  DR Address Option format  . . . . . . . . . . . . . . . .   9
     4.2.  BDR Address Option format . . . . . . . . . . . . . . . .   9
     4.3.  Error handling  . . . . . . . . . . . . . . . . . . . . .  10
   5.  Backwards Compatibility . . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   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, with PIM-SM ([RFC7761]), is used widely in
   Modern services.  Some events, such as changes in unicast routes, or
   a change in the PIM-SM DR, may cause the loss of multicast packets.

   The PIM DR has two responsibilities in the PIM-SM protocol.  For any
   active sources on a LAN, the PIM DR is responsible for registering
   with the Rendezvous Point (RP).  Also, the PIM DR is responsible for
   tracking local multicast listeners and forwarding data to these
   listeners.

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