Multiple Upstream Interfaces Support for IGMP/MLD Proxy
draft-asaeda-pim-mldproxy-multif-00

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PIM Working Group                                              H. Asaeda
Internet-Draft                                                      NICT
Intended status: Standards Track                                 S. Jeon
Expires: April 18, 2013                    Institute de Telecomunicacoes
                                                        October 15, 2012

        Multiple Upstream Interfaces Support for IGMP/MLD Proxy
                  draft-asaeda-pim-mldproxy-multif-00

Abstract

   This document describes the way of supporting multiple upstream
   interfaces for an IGMP/MLD proxy device.  The proposed extension
   enables that an IGMP/MLD proxy device receives multicast packets
   through multiple upstream interfaces, so that it is useful for
   multihoming support.

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   This Internet-Draft will expire on April 18, 2013.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Upstream Interface Selection  . . . . . . . . . . . . . . . . . 4
     3.1.  Basic Operation . . . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Supported Address Prefix  . . . . . . . . . . . . . . . . . 5
     3.3.  Interface Priority  . . . . . . . . . . . . . . . . . . . . 6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   6.  Normative References  . . . . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 7

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1.  Introduction

   The Internet Group Management Protocol (IGMP) [1][2][3][4] for IPv4
   and the Multicast Listener Discovery Protocol (MLD) [5][6][4] for
   IPv6 are the standard protocols for hosts to initiate joining or
   leaving of multicast sessions.  The IGMP/MLD proxy [7] maintains
   multicast membership information by IGMP/MLD protocols on the
   downstream interfaces and forwards IGMP/MLD report via the upstream
   interface to the upstream multicast routers.

   According to the specification of [7], a proxy device performing
   IGMP/MLD-based forwarding (as known as IGMP/MLD proxy) has *a single*
   upstream interface and one or more downstream interfaces.  It
   performs the router portion of the IGMP or MLD protocol on its
   downstream interfaces, and the host portion of IGMP/MLD on its
   upstream interface.  The proxy device must not perform the router
   portion of IGMP/MLD on its upstream interface.

   On the other hand, there are requirements that an IGMP/MLD proxy
   device allows to use multiple upstream interfaces.  For example, a
   proxy device having more than two interfaces may want to access to
   different networks, such as Internet and Intranet.  Or, a proxy
   device having wired link (e.g., ethernet) and high-speed wireless
   link (e.g., WiMAX or LTE) may want to have the capability to connect
   to the Internet through both links.  These proxy devices shall
   receive multicast packets from the different upstream interfaces and
   forward to the downstream interface(s).

   This document describes the way of supporting the scenario in which
   an IGMP/MLD proxy device enables to configure "multiple upstream
   interfaces" and receives multicast packets through these interfaces.
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