PIM Backup Designated Router Procedure
draft-mankamana-pim-bdr-01

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Network Working Group                                  Mankamana. Mishra
Internet-Draft                                             Cisco Systems
Intended status: Informational                          October 22, 2018
Expires: April 25, 2019

                 PIM Backup Designated Router Procedure
                       draft-mankamana-pim-bdr-01

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
   this document, we propose a mechanism to elect backup DR on a shared
   LAN.  A backup DR on LAN would be useful for faster convergence.
   This draft introduces the concept of a Backup Designated Router (BDR)
   and the procedure to implement it.

Status of This Memo

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   This Internet-Draft will expire on April 25, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability and deviation from draft PIM DR Improvement . .   4
   4.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   4
     4.1.  PIM Backup DR (BDR) election procedure  . . . . . . . . .   4
     4.2.  Existing PIM DR failure . . . . . . . . . . . . . . . . .   4
     4.3.  Existing PIM BDR failure  . . . . . . . . . . . . . . . .   4
     4.4.  New PIM Router addition in network  . . . . . . . . . . .   4
       4.4.1.  New PIM router eligible to be PIM DR on shared LAN  .   4
       4.4.2.  New PIM router eligible to be PIM BDR on shared LAN .   5
       4.4.3.  New PIM router is not eligible to be PIM DR or BDR on
               shared LAN  . . . . . . . . . . . . . . . . . . . . .   5
     4.5.  Initial case, All new PIM router coming up in shared LAN    5
     4.6.  Benefit . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Manageability Considerations  . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   6
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   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 has two roles in the PIM-SM protocol.
   On the first hop network, the PIM DR is responsible for registering
   an active source with the Rendezvous Point (RP) if the group is
   operating in PIM-SM.  On the last hop LAN, the PIM DR is responsible
   for tracking local multicast listeners and forwarding to these
   listeners if the group is operating in PIM-SM.

   Consider the following last hop LAN in Figure 1:

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                            ( core networks )
                              |     |     |
                              |     |     |
                             R1    R2     R3
                              |     |     |
                           --(last hop LAN)--
                                    |
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