Source specific multicast range distribution for L2 multicast networks
draft-ramki-igmp-ssm-ranges-00

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Last updated 2019-07-08
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Network Working Group                       R. Chokkanathapuram Sundaram
Internet-Draft                                                 S. Venaas
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: January 9, 2020                                    July 8, 2019

 Source specific multicast range distribution for L2 multicast networks
                     draft-ramki-igmp-ssm-ranges-00

Abstract

   In an IGMP snooping multicast network with version 3 (v3) enabled on
   the routers, when a v2 join/leave is received for a multicast group
   the router operates on V2 compatible mode.  For SSM ranges a (*,G)v2
   or v3 report should be ignored by the router/switch.  The IGMP
   snooping switches may not have knowledge about the user configured
   SSM range in the network to correctly discard/ignore the v2 join/
   leave.  Accepting (*,G) v2 or v3 will cause SSM operations to fail.
   This draft discusses distribution of SSM ranges in the L2 multicast
   network so that L2 snooping switches can learn about the configured
   SSM ranges and discard any (*,G) v2/v3 reports for the said ranges.

Status of This Memo

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Chokkanathapuram SundaramExpiresaJanuary 9, 2020                [Page 1]
Internet-DraSSM range distribution for L2 multicast networks.  July 2019

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  L2 network with a PIM router  . . . . . . . . . . . . . . . .   3
   3.  L2 multicast network with no PIM router . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   IGMP v2 join and leaves and IGMP v3 (*,G) group records should be
   discarded for Source specific multicast group ranges.  The default
   SSM range is 232/8 but changing the range is possible.  In a L2
   multicast network the Snooping switches are unaware of the user
   configured SSM ranges in the network.  Methods are needed to
   distribute user configured SSM ranges so that all snooping switches
   in the L2 domain knows about the same.  Thus the snooping switches
   can discard the Version 2 joins/leaves falling in the SSM range.  If
   the v2 joins/leaves for the SSM ranges are not discarded then the
   router/ querier start operating in v2 mode.  This will result in
   outages.  The same problem is applicable for MLD as well.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

1.2.  Terminology

   DR:  Designated Router

   SSM:  Source Specific Multicast

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2.  L2 network with a PIM router

   In a LAN if a PIM router is detected the LAN segment should use the
   PIM SSM range configured on the PIM router which is the DR on the
   LAN.  Snooping switches typically process PIM Hello packets already
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