PIM Null register packing
draft-ietf-pim-null-register-packing-05

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Network Working Group                                          V. Kamath
Internet-Draft                                                    VMware
Intended status: Standards Track            R. Chokkanathapuram Sundaram
Expires: August 29, 2020                                      R. Banthia
                                                     Cisco Systems, Inc.
                                                       February 26, 2020

                       PIM Null register packing
                draft-ietf-pim-null-register-packing-05

Abstract

   In PIM-SM networks PIM registers are sent from the first hop router
   to the RP (Rendezvous Point) to signal the presence of Multicast
   source in the network.  There are periodic PIM Null registers sent
   from first hop router to the RP to keep the state alive at the RP as
   long as the source is active.  The PIM Null register packet carries
   information about a single Multicast source and group.  This document
   defines a standard to send multiple Multicast source and group
   information in a single pim Null register packet and the
   interoperability between the PIM routers which do not understand the
   packet format with multiple Multicast source and group details.

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
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   This Internet-Draft will expire on August 29, 2020.

Copyright Notice

   Copyright (c) 2020 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

Kamath, et al.           Expires August 29, 2020                [Page 1]
Internet-Draft          PIM Null register packing          February 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  PIM Register Stop format with capability option . . . . . . .   3
   3.  New PIM Null register message . . . . . . . . . . . . . . . .   4
   4.  New PIM Register Stop message format  . . . . . . . . . . . .   4
   5.  Protocol operation  . . . . . . . . . . . . . . . . . . . . .   5
   6.  PIM Anycast RP considerations . . . . . . . . . . . . . . . .   6
   7.  PIM RP router version downgrade . . . . . . . . . . . . . . .   6
   8.  Fragmentation consideration . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   PIM Null registers are sent by First hop routers periodically for
   Multicast streams to keep the states active on the RP as long as the
   Multicast source is alive.  As the number of multicast sources
   increases, the number of PIM Null register packets that are sent
   increases at a given time.  This results in more PIM packet
   processing at RP and FHR.  The control plane policing (COPP),
   monitors the packets that gets processed by the control plane.  Due
   to the high rate at which Null registers are received at the RP, this
   can lead to COPP drops of Multicast PIM Null register packets.  This
   draft proposes a method to efficiently pack multiple PIM Null
   registers and register stop into a single message as these packets
   anyway don't contain data.  The draft also proposes interoperability
   with the routers that do not understand the new packet format.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",