PIM Designated Router graceful shutdown
draft-mankamana-pim-graceful-dr-shutdown-00

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Last updated 2018-07-02
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Network Working Group                                  Mankamana. Mishra
Internet-Draft                                              Stig. Venaas
Intended status: Standards Track                           Cisco Systems
Expires: January 3, 2019                               Mahesh. Sivakumar
                                                        juniper networks
                                                     Zheng(Sandy). Zhang
                                                         ZTE Corporation
                                                     Mikael. Abrahamsson
                                                            July 2, 2018

                PIM Designated Router graceful shutdown
              draft-mankamana-pim-graceful-dr-shutdown-00

Abstract

   On a multi-access network, one of the PIM routers is elected as a
   Designated Router (DR).  On the last hop LAN, the PIM DR is
   responsible for tracking local multicast listeners and forwarding
   traffic to these listeners if the group is operating in PIM-SM.  In
   case of a network maintenance, where we want to bring down the
   current DR, there is currently no way to gracefully handover the PIM
   DR role to a new DR on the shared LAN.  In this document, we propose
   a modification to the PIM-SM protocol that allows PIM DR to
   gracefully shutdown or go down for maintenance.  We also provide a
   procedure for PIM DR to gracefully handover its role to a new PIM DR
   in the network.

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 January 3, 2019.

Mishra, et al.           Expires January 3, 2019                [Page 1]
Internet-Draft   PIM Designated Router graceful shutdown       July 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   4
     3.1.  Proposed Mechanism  . . . . . . . . . . . . . . . . . . .   4
     3.2.  Impact on the network . . . . . . . . . . . . . . . . . .   4
       3.2.1.  Every PIM router supports the new specification on
               the shared LAN  . . . . . . . . . . . . . . . . . . .   4
       3.2.2.  Hybrid shared LAN, some of PIM router does not
               support specification . . . . . . . . . . . . . . . .   5
   4.  PIM Hello option  . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   On a multi-access LAN such as an Ethernet, one of the PIM routers is
   elected as a DR.  The PIM DR represents the LAN segment/broadcast
   domain in the PIM topology tree and has two roles to play in the PIM-
   SM protocol.  For sources connected to the segment, the PIM DR is
   responsible for registering one or more active sources with the
   Rendezvous Point (RP) if the group is operating in PIM-SM.  In
   addition, on the last hop LAN, the PIM DR is responsible for tracking
   local multicast listeners and forwarding data traffic to these
   listeners if the group is operating in PIM-SM.
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