    Network Working Group                                    J. Chesterfield
    Request for Comments: 5519                       University of Cambridge
    Obsoletes: 2933, 3019                                   B. Haberman, Ed.
    Category: Standards Track                                        JHU/APL
                                                                  April 2009

                    Multicast Group Membership Discovery MIB

    Status of This Memo

       This document specifies an Internet standards track protocol for the
       Internet community, and requests discussion and suggestions for
       improvements.  Please refer to the current edition of the "Internet
       Official Protocol Standards" (STD 1) for the standardization state
       and status of this protocol.  Distribution of this memo is unlimited.

    Copyright Notice

       Copyright (c) 2009 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 in effect on the date of
       publication of this document (http://trustee.ietf.org/license-info).
       Please review these documents carefully, as they describe your rights
       and restrictions with respect to this document.

    Abstract

       This memo defines a portion of the Management Information Base (MIB)
       for use with network management protocols in the Internet community.
       In particular, it describes objects used for managing the Internet
       Group Management Protocol (IGMP) and the Multicast Listener Discovery
       (MLD) protocol.

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    Table of Contents

       1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
       2.  The Internet-Standard Management Framework . . . . . . . . . .  2
       3.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
       4.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
       5.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
       6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 38
       7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 39
       8.  Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 39
       9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 40
       10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 40
         10.1.  Normative References  . . . . . . . . . . . . . . . . . . 40
         10.2.  Informative References  . . . . . . . . . . . . . . . . . 41

    1.  Introduction

       This memo defines a portion of the Management Information Base (MIB)
       for use with network management protocols in the Internet community.
       In particular, it describes objects used for managing the Internet
       Group Management Protocol (IGMP) version 1 [RFC1112], version 2
       [RFC2236], or version 3 [RFC3376] and the Multicast Listener
       Discovery (MLD) protocol version 1 [RFC2710] or version 2 [RFC3810].
       Both protocols provide multicast membership discovery capability.
       IGMP pertains to IP version 4 clients, and MLD to IP version 6
       clients.  This version of the MIB obsoletes both RFC 2933 [RFC2933]
       and RFC 3019 [RFC3019], incorporating a generic interface for both
       IGMP and MLD implementations and incorporating changes to enable
       "source filtering" in multicast clients.  The MIB encompasses both
       router and host nodes with relevant management objects defined for
       each.

    2.  The Internet-Standard Management Framework

       For a detailed overview of the documents that describe the current
       Internet-Standard Management Framework, please refer to section 7 of
       RFC 3410 [RFC3410].

       Managed objects are accessed via a virtual information store, termed
       the Management Information Base or MIB.  MIB objects are generally
       accessed through the Simple Network Management Protocol (SNMP).
       Objects in the MIB are defined using the mechanisms defined in the
       Structure of Management Information (SMI).  This memo specifies a MIB
       module that is compliant to the SMIv2, which is described in STD 58,
       RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
       [RFC2580].

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    3.  Conventions

       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].

    4.  Overview

       This Multicast Group Membership Discovery (MGMD) MIB module contains
       eight tables:

       1.  the MGMD Host Interface Table, which contains one row for each
           interface on which IGMP or MLD is enabled on a host,

       2.  the MGMD Router Interface Table, which contains one row for each
           interface on which MGMD is enabled on a router,

       3.  the MGMD Host Cache Table, which contains one row for each IP
           multicast group for which there are members on a particular
           interface on a host,

       4.  the MGMD Router Cache Table, which contains one row for each IP
           multicast group for which there are members on a particular
           interface on a router,

       5.  the reverse MGMD Host Table, which contains one row for each
           interface for which there are active multicast groups on a host,

       6.  the reverse MGMD Router Table, which contains one row for each
           interface for which there are active multicast groups on a
           router,

       7.  the MGMD HostSrcList Table, which contains one row for each entry
           in the source filter record for an interface and multicast group
           pair on a host, and

       8.  the MGMD RouterSrcList Table, which contains one row for each
           entry in the source filter record for an interface and multicast
           group pair on a router.

       All tables are intended for EITHER router OR host functionality as
       indicated by the name and corresponding description, although it is
       anticipated that there will be scenarios where both terms might apply
       to a device, e.g., a router that joins a multicast group also as a
       host for measurement purposes.  The source list tables provide an
       extension to the cache tables to indicate the source-specific

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       includes or excludes associated with each IP multicast group on each
       specific interface.  This functionality is only supported in IGMPv3-
       and MLDv2-capable nodes.

       Incorporated within the MGMD MIB tables are objects for the
       management of IGMP and MLD proxy devices as described in RFC 4605
       [RFC4605].  Proxy devices can be used in simple topologies where it
       is not necessary to run a full multicast routing protocol.  A proxy
       device can make forwarding decisions based on IGMP or MLD group
       membership activity.

       The MIB references InterfaceIndex and InterfaceIndexOrZero objects as
       defined in RFC 2863 [RFC2863], the MIB that describes generic objects
       for network interface sub-layers.

       Extensive references to the InetAddress and InetAddressType objects
       are made as defined in RFC 4001 [RFC4001].

    5.  Definitions

    MGMD-STD-MIB DEFINITIONS ::= BEGIN

    IMPORTS
        MODULE-IDENTITY, OBJECT-TYPE, mib-2, Counter32, Gauge32,
        Unsigned32, TimeTicks            FROM SNMPv2-SMI
        InetAddress, InetAddressType     FROM INET-ADDRESS-MIB
        RowStatus                        FROM SNMPv2-TC
        MODULE-COMPLIANCE, OBJECT-GROUP  FROM SNMPv2-CONF
        InterfaceIndexOrZero,
        InterfaceIndex                   FROM IF-MIB;

    mgmdStdMIB MODULE-IDENTITY
        LAST-UPDATED "200903300000Z" -- March 30, 2009
        ORGANIZATION "INTERNET ENGINEERING TASK FORCE MULTICAST and
        ANYCAST GROUP MEMBERSHIP Working
            Group.
            www:   http://www.ietf.org/html.charters/magma-charter.html
            EMail: magma@ietf.org"
        CONTACT-INFO
            "Julian Chesterfield
            University of Cambridge,
            Computer Laboratory,
            15 JJ Thompson Avenue,
            Cambridge,
            CB3 0FD
            UK

            EMail: julian.chesterfield@cl.cam.ac.uk"

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        DESCRIPTION
            "The MIB module for MGMD management.
            A new version of MGMD combining RFC 2933 and RFC 3019.
            Includes IGMPv3 and MLDv2 source filtering changes.

            Copyright (c) 2009 IETF Trust and the persons
            identified as authors of the code.  All rights reserved.

            Redistribution and use in source and binary forms, with or
            without modification, are permitted provided that the
            following conditions are met:

            - Redistributions of source code must retain the above copyright
              notice, this list of conditions and the following disclaimer.

            - Redistributions in binary form must reproduce the above
              copyright notice, this list of conditions and the following
              disclaimer in the documentation and/or other materials
              provided with the distribution.

            - Neither the name of Internet Society, IETF or IETF Trust,
              nor the names of specific contributors, may be used to endorse
              or promote products derived from this software without
              specific prior written permission.

            THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
            CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
            INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
            MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
            DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
            CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
            SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
            NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
            LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
            HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
            CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
            OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
            EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

            This version of this MIB module is part of RFC 5519;
            see the RFC itself for full legal notices."

        REVISION "200903300000Z" -- March 30, 2009
        DESCRIPTION
            "This MIB obsoletes both RFC 2933 and RFC 3019."

        ::= { mib-2 185 }

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    mgmdMIBObjects     OBJECT IDENTIFIER ::= { mgmdStdMIB 1 }

    --
    --  The MGMD Host Interface Table
    --

    mgmdHostInterfaceTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdHostInterfaceEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the interfaces on which
                 IGMP or MLD is enabled."

        ::= { mgmdMIBObjects 1 }

    mgmdHostInterfaceEntry OBJECT-TYPE
        SYNTAX     MgmdHostInterfaceEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) representing an interface on
                which IGMP or MLD is enabled."
        INDEX      { mgmdHostInterfaceIfIndex,
                     mgmdHostInterfaceQuerierType }

        ::= { mgmdHostInterfaceTable 1 }

    MgmdHostInterfaceEntry ::= SEQUENCE {
        mgmdHostInterfaceIfIndex               InterfaceIndex,
        mgmdHostInterfaceQuerierType           InetAddressType,
        mgmdHostInterfaceQuerier               InetAddress,
        mgmdHostInterfaceStatus                RowStatus,
        mgmdHostInterfaceVersion               Unsigned32,
        mgmdHostInterfaceVersion1QuerierTimer  TimeTicks,
        mgmdHostInterfaceVersion2QuerierTimer  TimeTicks,
        mgmdHostInterfaceVersion3Robustness    Unsigned32
    }

    mgmdHostInterfaceIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The ifIndex value of the interface for which IGMP or MLD is
                 enabled.  The table is indexed by the ifIndex value and the
                 InetAddressType to allow for interfaces that may be
                 configured in both IPv4 and IPv6 modes."

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        ::= { mgmdHostInterfaceEntry 1 }

    mgmdHostInterfaceQuerierType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of this interface.  This entry along with
                 the ifIndex value acts as an index to the mgmdHostInterface
                 table.  A physical interface may be configured in multiple
                 modes concurrently, e.g., in IPv4 and IPv6 modes connected
                 to the same interface; however, the traffic is considered
                 to be logically separate."

        ::= { mgmdHostInterfaceEntry 2 }

    mgmdHostInterfaceQuerier OBJECT-TYPE
        SYNTAX     InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The address of the IGMP or MLD Querier on the IP subnet to
                 which this interface is attached.  The InetAddressType,
                 e.g., IPv4 or IPv6, is identified by the
                 mgmdHostInterfaceQuerierType variable in the
                 mgmdHostInterface table."

        ::= { mgmdHostInterfaceEntry 3 }

    mgmdHostInterfaceStatus OBJECT-TYPE
        SYNTAX     RowStatus
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The activation of a row enables the host side of IGMP or
                MLD on the interface.  The destruction of a row disables
                the host side of IGMP or MLD on the interface."

        ::= { mgmdHostInterfaceEntry 4 }

    mgmdHostInterfaceVersion OBJECT-TYPE
        SYNTAX     Unsigned32 (1..3)
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The maximum version of MGMD that the host can run on
                this interface.  A value of 1 is only applicable for IPv4,
                and indicates that the host only supports IGMPv1 on the

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                interface.  A value of 2 indicates that the host also
                supports IGMPv2 (for IPv4) or MLDv1 (for IPv6).  A value of
                3 indicates that the host also supports IGMPv3 (for IPv4)
                or MLDv2 (for IPv6)."
        DEFVAL     { 3 }

        ::= { mgmdHostInterfaceEntry 5 }

    mgmdHostInterfaceVersion1QuerierTimer OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time remaining until the host assumes that there are
                no IGMPv1 routers present on the interface.  While this is
                non-zero, the host will reply to all queries with version 1
                membership reports.  This variable applies to IGMPv2 or 3
                hosts that are forced to run in v1 for compatibility with
                v1 routers present on the interface.  This object may only
                be present when the corresponding value of
                mgmdHostInterfaceQuerierType is ipv4."
        REFERENCE "RFC 2236, Section 4 and RFC 3376, Section 7.2.1"
        DEFVAL     { 0 }

        ::= { mgmdHostInterfaceEntry 6 }

    mgmdHostInterfaceVersion2QuerierTimer OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time remaining until the host assumes that there are
                no MGMDv2 routers present on the interface.  While this is
                non-zero, the host will reply to all queries with version 1
                or 2 membership reports.  This variable applies to MGMDv3
                hosts that are forced to run in v2 for compatibility with
                v2 hosts or routers present on the interface."
        REFERENCE "RFC 3376, Section 7.2.1 and RFC 3810, Section 8.2.1"
        DEFVAL     { 0 }

        ::= { mgmdHostInterfaceEntry 7 }

    mgmdHostInterfaceVersion3Robustness OBJECT-TYPE
        SYNTAX     Unsigned32
        MAX-ACCESS read-create
        STATUS     current

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        DESCRIPTION
                "The robustness variable utilised by an MGMDv3 host in
                sending state-change reports for multicast routers.  To
                ensure the state-change report is not missed, the host
                retransmits the state-change report
                [mgmdHostInterfaceVersion3Robustness - 1] times.  The
                variable must be a non-zero value."
        REFERENCE "RFC 3376, Section 8.1 and RFC 3810, Section 9.14.1"
        DEFVAL     { 2 }

        ::= { mgmdHostInterfaceEntry 8 }

    --
    --  The MGMD Router Interface Table
    --

    mgmdRouterInterfaceTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdRouterInterfaceEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the interfaces on which
                IGMP or MLD is enabled."

        ::= { mgmdMIBObjects 2 }

    mgmdRouterInterfaceEntry OBJECT-TYPE
        SYNTAX     MgmdRouterInterfaceEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) representing an interface on
                which IGMP or MLD is enabled."
        INDEX      { mgmdRouterInterfaceIfIndex,
                     mgmdRouterInterfaceQuerierType }

        ::= { mgmdRouterInterfaceTable 1 }

    MgmdRouterInterfaceEntry ::= SEQUENCE {
        mgmdRouterInterfaceIfIndex                 InterfaceIndex,
        mgmdRouterInterfaceQuerierType             InetAddressType,
        mgmdRouterInterfaceQuerier                 InetAddress,
        mgmdRouterInterfaceQueryInterval           Unsigned32,
        mgmdRouterInterfaceStatus                  RowStatus,
        mgmdRouterInterfaceVersion                 Unsigned32,
        mgmdRouterInterfaceQueryMaxResponseTime    Unsigned32,
        mgmdRouterInterfaceQuerierUpTime           TimeTicks,
        mgmdRouterInterfaceQuerierExpiryTime       TimeTicks,

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        mgmdRouterInterfaceWrongVersionQueries     Counter32,
        mgmdRouterInterfaceJoins                   Counter32,
        mgmdRouterInterfaceProxyIfIndex            InterfaceIndexOrZero,
        mgmdRouterInterfaceGroups                  Gauge32,
        mgmdRouterInterfaceRobustness              Unsigned32,
        mgmdRouterInterfaceLastMemberQueryInterval Unsigned32,
        mgmdRouterInterfaceLastMemberQueryCount    Unsigned32,
        mgmdRouterInterfaceStartupQueryCount       Unsigned32,
        mgmdRouterInterfaceStartupQueryInterval    Unsigned32
    }

    mgmdRouterInterfaceIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The ifIndex value of the interface for which IGMP or MLD
                is enabled.  The table is indexed by the ifIndex value and
                the InetAddressType to allow for interfaces that may be
                configured in both IPv4 and IPv6 modes."

        ::= { mgmdRouterInterfaceEntry 1 }

    mgmdRouterInterfaceQuerierType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of this interface.  This entry along with
                the ifIndex value acts as the index to the
                mgmdRouterInterface table.  A physical interface may be
                configured in multiple modes concurrently, e.g., in IPv4
                and IPv6 modes connected to the same interface; however,
                the traffic is considered to be logically separate."

        ::= { mgmdRouterInterfaceEntry 2 }

    mgmdRouterInterfaceQuerier OBJECT-TYPE
        SYNTAX     InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The address of the IGMP or MLD Querier on the IP subnet to
                which this interface is attached.  The InetAddressType,
                e.g., IPv4 or IPv6, is identified by the
                mgmdRouterInterfaceQuerierType variable in the
                mgmdRouterInterface table."

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        ::= { mgmdRouterInterfaceEntry 3 }

    mgmdRouterInterfaceQueryInterval OBJECT-TYPE
        SYNTAX     Unsigned32 (1..31744)
        UNITS      "seconds"
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The frequency at which IGMP or MLD Host-Query packets are
                transmitted on this interface."
        DEFVAL     { 125 }

        ::= { mgmdRouterInterfaceEntry 4 }

    mgmdRouterInterfaceStatus OBJECT-TYPE
        SYNTAX     RowStatus
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The activation of a row enables the router side of IGMP or
                MLD on the interface.  The destruction of a row disables
                the router side of IGMP or MLD on the interface."

        ::= { mgmdRouterInterfaceEntry 5 }

    mgmdRouterInterfaceVersion OBJECT-TYPE
        SYNTAX     Unsigned32 (1..3)
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The version of MGMD that is running on this interface.
                Value 1 applies to IGMPv1 routers only.  Value 2 applies
                to IGMPv2 and MLDv1 routers, and value 3 applies to IGMPv3
                and MLDv2 routers.

                This object can be used to configure a router capable of
                running either version.  For IGMP and MLD to function
                correctly, all routers on a LAN must be configured to run
                the same version on that LAN."
        DEFVAL     { 3 }

        ::= { mgmdRouterInterfaceEntry 6 }

    mgmdRouterInterfaceQueryMaxResponseTime OBJECT-TYPE
        SYNTAX     Unsigned32  (0..31744)
        UNITS      "tenths of seconds"
        MAX-ACCESS read-create
        STATUS     current

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        DESCRIPTION
                "The maximum query response interval advertised in MGMDv2
                or IGMPv3 queries on this interface."
        REFERENCE "RFC 3810, Section 9.3"
        DEFVAL     { 100 }

        ::= { mgmdRouterInterfaceEntry 7 }

    mgmdRouterInterfaceQuerierUpTime OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time since mgmdRouterInterfaceQuerier was last
                changed."

        ::= { mgmdRouterInterfaceEntry 8 }

    mgmdRouterInterfaceQuerierExpiryTime OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The amount of time remaining before the Other Querier
                Present Timer expires.  If the local system is the querier,
                the value of this object is zero."

        ::= { mgmdRouterInterfaceEntry 9 }

    mgmdRouterInterfaceWrongVersionQueries OBJECT-TYPE
        SYNTAX     Counter32
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The number of general queries received whose IGMP or MLD
                version does not match the equivalent
                mgmdRouterInterfaceVersion, over the lifetime of the row
                entry.  Both IGMP and MLD require that all routers on a LAN
                be configured to run the same version.  Thus, if any general
                queries are received with the wrong version, this indicates
                a configuration error."

        ::= { mgmdRouterInterfaceEntry 10 }

    mgmdRouterInterfaceJoins OBJECT-TYPE
        SYNTAX     Counter32

        MAX-ACCESS read-only

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        STATUS     current
        DESCRIPTION
                "The number of times a group membership has been added on
                this interface, that is, the number of times an entry for
                this interface has been added to the Cache Table.  This
                object can give an indication of the amount of activity
                between samples over time."

        ::= { mgmdRouterInterfaceEntry 11 }

    mgmdRouterInterfaceProxyIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndexOrZero
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "Some devices implement a form of IGMP or MLD proxying
                whereby memberships learned on the interface represented by
                this row cause Host Membership Reports to be sent on the
                interface whose ifIndex value is given by this object.
                Such a device would implement the mgmdV2RouterBaseMIBGroup
                only on its router interfaces (those interfaces with
                non-zero mgmdRouterInterfaceProxyIfIndex).  Typically, the
                value of this object is 0, indicating that no proxying is
                being done."
        DEFVAL     { 0 }

        ::= { mgmdRouterInterfaceEntry 12 }

    mgmdRouterInterfaceGroups OBJECT-TYPE
        SYNTAX     Gauge32
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The current number of entries for this interface in the
                mgmdRouterCacheTable."

        ::= { mgmdRouterInterfaceEntry 13 }

    mgmdRouterInterfaceRobustness OBJECT-TYPE
        SYNTAX     Unsigned32 (1..255)
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The Robustness Variable allows tuning for the expected
                packet loss on a subnet.  If a subnet is expected to be
                lossy, the Robustness Variable may be increased.  IGMP and
                MLD are robust to (Robustness Variable-1) packet losses."
        DEFVAL     { 2 }

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        ::= { mgmdRouterInterfaceEntry 14 }

    mgmdRouterInterfaceLastMemberQueryInterval OBJECT-TYPE
        SYNTAX     Unsigned32  (0..31744)
        UNITS      "tenths of seconds"
        MAX-ACCESS read-create
        STATUS     current
        DESCRIPTION
                "The Last Member Query Interval is the Max Query Response
                Interval inserted into group-specific queries sent in
                response to leave group messages, and is also the amount
                of time between group-specific query messages.  This value
                may be tuned to modify the leave latency of the network.  A
                reduced value results in reduced time to detect the loss of
                the last member of a group.  The value of this object is
                irrelevant if mgmdRouterInterfaceVersion is 1."
        DEFVAL     { 10 }

        ::= { mgmdRouterInterfaceEntry 15 }

    mgmdRouterInterfaceLastMemberQueryCount OBJECT-TYPE
        SYNTAX     Unsigned32 (1..255)
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "Represents the number of group-specific and group-and-
                source-specific queries sent by the router before it assumes
                there are no local members."

        ::= { mgmdRouterInterfaceEntry 16 }

    mgmdRouterInterfaceStartupQueryCount OBJECT-TYPE
        SYNTAX     Unsigned32 (1..255)
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "Represents the number of Queries sent out on startup,
                separated by the Startup Query Interval."

        ::= { mgmdRouterInterfaceEntry 17 }

    mgmdRouterInterfaceStartupQueryInterval OBJECT-TYPE
        SYNTAX     Unsigned32 (0..31744)
        UNITS      "seconds"
        MAX-ACCESS read-only
        STATUS     current

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        DESCRIPTION
                "This variable represents the interval between General
                Queries sent by a Querier on startup."

        ::= { mgmdRouterInterfaceEntry 18 }

    --
    --  The MGMD Host Cache Table
    --

    mgmdHostCacheTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdHostCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the IP multicast groups for
                 which the host is a member on a particular interface."

        ::= { mgmdMIBObjects 3 }

    mgmdHostCacheEntry OBJECT-TYPE
        SYNTAX     MgmdHostCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the mgmdHostCacheTable."
        INDEX      { mgmdHostCacheAddressType, mgmdHostCacheAddress,
                     mgmdHostCacheIfIndex }

        ::= { mgmdHostCacheTable 1 }

    MgmdHostCacheEntry ::= SEQUENCE {
        mgmdHostCacheAddressType        InetAddressType,
        mgmdHostCacheAddress            InetAddress ,
        mgmdHostCacheIfIndex            InterfaceIndex,
        mgmdHostCacheUpTime             TimeTicks,
        mgmdHostCacheLastReporter       InetAddress,
        mgmdHostCacheSourceFilterMode   INTEGER
    }

    mgmdHostCacheAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the mgmdHostCacheTable entry.  This
                value applies to both the mgmdHostCacheAddress and the
                mgmdHostCacheLastReporter entries."

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        ::= { mgmdHostCacheEntry 1 }

    mgmdHostCacheAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information.  The InetAddressType, e.g., IPv4 or
                IPv6, is identified by the mgmdHostCacheAddressType variable
                in the mgmdHostCache table."

        ::= { mgmdHostCacheEntry 2 }

    mgmdHostCacheIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information
                for an IP multicast group address."

        ::= { mgmdHostCacheEntry 3 }

    mgmdHostCacheUpTime OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time elapsed since this entry was created."

        ::= { mgmdHostCacheEntry 4 }

    mgmdHostCacheLastReporter OBJECT-TYPE
        SYNTAX     InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The IP address of the source of the last membership report
                received for this IP multicast group address on this
                interface.  If no membership report has been received, this
                object has a value of 0.  The InetAddressType, e.g., IPv4 or
                IPv6, is identified by the mgmdHostCacheAddressType variable
                in the mgmdHostCache table."

        ::= { mgmdHostCacheEntry 5 }

    mgmdHostCacheSourceFilterMode OBJECT-TYPE

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        SYNTAX     INTEGER {include (1),
                            exclude (2) }
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The state in which the interface is currently set.  The
                value indicates the relevance of the corresponding source
                list entries in the mgmdHostSecListTable for MGMDv3
                interfaces."

        ::= { mgmdHostCacheEntry 6 }

    --
    --  The MGMD Router Cache Table
    --

    mgmdRouterCacheTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdRouterCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the IP multicast groups for
                which there are members on a particular router interface."

        ::= { mgmdMIBObjects 4 }

    mgmdRouterCacheEntry OBJECT-TYPE
        SYNTAX     MgmdRouterCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the mgmdRouterCacheTable."

        INDEX      { mgmdRouterCacheAddressType, mgmdRouterCacheAddress,
                     mgmdRouterCacheIfIndex }

        ::= { mgmdRouterCacheTable 1 }

    MgmdRouterCacheEntry ::= SEQUENCE {
        mgmdRouterCacheAddressType        InetAddressType,
        mgmdRouterCacheAddress            InetAddress,
        mgmdRouterCacheIfIndex            InterfaceIndex,
        mgmdRouterCacheLastReporter       InetAddress,
        mgmdRouterCacheUpTime             TimeTicks,
        mgmdRouterCacheExpiryTime         TimeTicks,
        mgmdRouterCacheExcludeModeExpiryTimer
                                          TimeTicks,
        mgmdRouterCacheVersion1HostTimer  TimeTicks,

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        mgmdRouterCacheVersion2HostTimer  TimeTicks,
        mgmdRouterCacheSourceFilterMode   INTEGER
    }

    mgmdRouterCacheAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the mgmdRouterCacheTable entry.  This
                value applies to both the mgmdRouterCacheAddress and the
                mgmdRouterCacheLastReporter entries."

        ::= { mgmdRouterCacheEntry 1 }

    mgmdRouterCacheAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information.  The InetAddressType, e.g., IPv4 or
                IPv6, is identified by the mgmdRouterCacheAddressType
                variable in the mgmdRouterCache table."

        ::= { mgmdRouterCacheEntry 2 }

    mgmdRouterCacheIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information
                for an IP multicast group address."

        ::= { mgmdRouterCacheEntry 3 }

    mgmdRouterCacheLastReporter OBJECT-TYPE
        SYNTAX     InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The IP address of the source of the last membership report
                received for this IP multicast group address on this
                interface.  If no membership report has been received, this
                object has the value 0.  The InetAddressType, e.g., IPv4 or
                IPv6, is identified by the mgmdRouterCacheAddressType
                variable in the mgmdRouterCache table."

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        ::= { mgmdRouterCacheEntry 4 }

    mgmdRouterCacheUpTime OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time elapsed since this entry was created."

        ::= { mgmdRouterCacheEntry 5 }

    mgmdRouterCacheExpiryTime OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "This value represents the time remaining before the Group
                Membership Interval state expires.  The value must always be
                greater than or equal to 1."

        ::= { mgmdRouterCacheEntry 6 }

    mgmdRouterCacheExcludeModeExpiryTimer OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "This value is applicable only to MGMDv3-compatible nodes
                and represents the time remaining before the interface
                EXCLUDE state expires and the interface state transitions
                to INCLUDE mode.  This value can never be greater than
                mgmdRouterCacheExpiryTime."

        ::= { mgmdRouterCacheEntry 7 }

    mgmdRouterCacheVersion1HostTimer OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time remaining until the local router will assume that
                there are no longer any MGMD version 1 members on the IP
                subnet attached to this interface.  This entry only applies
                to IGMPv1 hosts, and is not implemented for MLD.  Upon
                hearing any MGMDv1 Membership Report (IGMPv1 only), this
                value is reset to the group membership timer.  While this

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    RFC 5519                        MGMD MIB                      April 2009

                time remaining is non-zero, the local router ignores any
                MGMDv2 Leave messages (IGMPv2 only) for this group that it
                receives on this interface."

        ::= { mgmdRouterCacheEntry 8 }

    mgmdRouterCacheVersion2HostTimer OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The time remaining until the local router will assume that
                there are no longer any MGMD version 2 members on the IP
                subnet attached to this interface.  This entry applies to
                both IGMP and MLD hosts.  Upon hearing any MGMDv2 Membership
                Report, this value is reset to the group membership timer.
                Assuming no MGMDv1 hosts have been detected, the local
                router does not ignore any MGMDv2 Leave messages for this
                group that it receives on this interface."

        ::= { mgmdRouterCacheEntry 9 }

    mgmdRouterCacheSourceFilterMode OBJECT-TYPE
        SYNTAX     INTEGER {include (1),
                            exclude (2) }
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The current cache state, applicable to MGMDv3-compatible
                nodes.  The value indicates whether the state is INCLUDE or
                EXCLUDE."

        ::= { mgmdRouterCacheEntry 10 }

    --
    --  The MGMD Inverse Host interface/cache lookup Table
    --

    mgmdInverseHostCacheTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdInverseHostCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the interfaces that are
                members of a particular group.  This is an inverse lookup
                table for entries in the mgmdHostCacheTable."

        ::= { mgmdMIBObjects 5 }

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    mgmdInverseHostCacheEntry OBJECT-TYPE
        SYNTAX     MgmdInverseHostCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the
                mgmdInverseHostCacheTable."
        INDEX      { mgmdInverseHostCacheIfIndex,
                     mgmdInverseHostCacheAddressType,
                     mgmdInverseHostCacheAddress}

        ::= { mgmdInverseHostCacheTable 1 }

    MgmdInverseHostCacheEntry ::= SEQUENCE {
        mgmdInverseHostCacheIfIndex            InterfaceIndex,
        mgmdInverseHostCacheAddressType        InetAddressType,
        mgmdInverseHostCacheAddress            InetAddress
    }

    mgmdInverseHostCacheIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information."

        ::= { mgmdInverseHostCacheEntry 1 }

    mgmdInverseHostCacheAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the mgmdInverseHostCacheTable entry."

        ::= { mgmdInverseHostCacheEntry 2 }

    mgmdInverseHostCacheAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information about an interface.  The
                InetAddressType, e.g., IPv4 or IPv6, is identified by the
                mgmdInverseHostCacheAddressType variable in the
                mgmdInverseHostCache table."

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        ::= { mgmdInverseHostCacheEntry 3 }

    --
    --  The MGMD Inverse Router interface/cache lookup Table
    --

    mgmdInverseRouterCacheTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdInverseRouterCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the interfaces that
                are members of a particular group.  This is an inverse
                lookup table for entries in the mgmdRouterCacheTable."

        ::= { mgmdMIBObjects 6 }

    mgmdInverseRouterCacheEntry OBJECT-TYPE
        SYNTAX     MgmdInverseRouterCacheEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the
                mgmdInverseRouterCacheTable."
        INDEX      { mgmdInverseRouterCacheIfIndex,
                     mgmdInverseRouterCacheAddressType,
                     mgmdInverseRouterCacheAddress }

        ::= { mgmdInverseRouterCacheTable 1 }

    MgmdInverseRouterCacheEntry ::= SEQUENCE {
        mgmdInverseRouterCacheIfIndex            InterfaceIndex,
        mgmdInverseRouterCacheAddressType        InetAddressType,
        mgmdInverseRouterCacheAddress            InetAddress
    }

    mgmdInverseRouterCacheIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information
                for an IP multicast group address."

        ::= { mgmdInverseRouterCacheEntry 1 }

    mgmdInverseRouterCacheAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }

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        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the mgmdInverseRouterCacheTable entry."

        ::= { mgmdInverseRouterCacheEntry 2 }

    mgmdInverseRouterCacheAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information.  The InetAddressType, e.g., IPv4 or
                IPv6, is identified by the mgmdInverseRouterCacheAddressType
                variable in the mgmdInverseRouterCache table."

        ::= { mgmdInverseRouterCacheEntry 3 }

    --
    --  The MGMD Host Source list Table
    --

    mgmdHostSrcListTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdHostSrcListEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the Source List entries
                 corresponding to each interface and multicast group pair
                 on a host."

        ::= { mgmdMIBObjects 7 }

    mgmdHostSrcListEntry OBJECT-TYPE
        SYNTAX     MgmdHostSrcListEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the mgmdHostSrcListTable."
        INDEX      { mgmdHostSrcListAddressType, mgmdHostSrcListAddress,
                     mgmdHostSrcListIfIndex, mgmdHostSrcListHostAddress }

        ::= { mgmdHostSrcListTable 1 }

    MgmdHostSrcListEntry ::= SEQUENCE {
        mgmdHostSrcListAddressType      InetAddressType,
        mgmdHostSrcListAddress          InetAddress,

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        mgmdHostSrcListIfIndex          InterfaceIndex,
        mgmdHostSrcListHostAddress      InetAddress,
        mgmdHostSrcListExpire           TimeTicks
    }

    mgmdHostSrcListAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the InetAddress variables in this
                table.  This value applies to the mgmdHostSrcListHostAddress
                and mgmdHostSrcListAddress entries."

        ::= { mgmdHostSrcListEntry 1 }

    mgmdHostSrcListAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information."

        ::= { mgmdHostSrcListEntry 2 }

    mgmdHostSrcListIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information
                for an IP multicast group address."

        ::= { mgmdHostSrcListEntry 3 }

    mgmdHostSrcListHostAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The host address to which this entry corresponds.  The
                mgmdHostCacheSourceFilterMode value for this group address
                and interface indicates whether this host address is
                included or excluded."

        ::= { mgmdHostSrcListEntry 4 }

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    mgmdHostSrcListExpire OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current
        DESCRIPTION
                "This value indicates the relevance of the SrcList entry,
                whereby a non-zero value indicates this is an INCLUDE state
                value, and a zero value indicates this to be an EXCLUDE
                state value."

        ::= { mgmdHostSrcListEntry 5 }

    --
    --  The MGMD Router Source list Table
    --

    mgmdRouterSrcListTable OBJECT-TYPE
        SYNTAX     SEQUENCE OF MgmdRouterSrcListEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The (conceptual) table listing the Source List entries
                corresponding to each interface and multicast group pair on
                a Router."

        ::= { mgmdMIBObjects 8 }

    mgmdRouterSrcListEntry OBJECT-TYPE
        SYNTAX     MgmdRouterSrcListEntry
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "An entry (conceptual row) in the mgmdRouterSrcListTable."
        INDEX      { mgmdRouterSrcListAddressType,
                     mgmdRouterSrcListAddress,
                     mgmdRouterSrcListIfIndex,
                     mgmdRouterSrcListHostAddress }

        ::= { mgmdRouterSrcListTable 1 }

    MgmdRouterSrcListEntry ::= SEQUENCE {
        mgmdRouterSrcListAddressType    InetAddressType,
        mgmdRouterSrcListAddress        InetAddress,
        mgmdRouterSrcListIfIndex        InterfaceIndex,
        mgmdRouterSrcListHostAddress    InetAddress,
        mgmdRouterSrcListExpire         TimeTicks
    }

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    mgmdRouterSrcListAddressType OBJECT-TYPE
        SYNTAX     InetAddressType { ipv4(1), ipv6(2) }
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The address type of the InetAddress variables in this
                table.  This value applies to the
                mgmdRouterSrcListHostAddress and mgmdRouterSrcListAddress
                entries."

        ::= { mgmdRouterSrcListEntry 1 }

    mgmdRouterSrcListAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The IP multicast group address for which this entry
                contains information."

        ::= { mgmdRouterSrcListEntry 2 }

    mgmdRouterSrcListIfIndex OBJECT-TYPE
        SYNTAX     InterfaceIndex
        MAX-ACCESS not-accessible
        STATUS     current
        DESCRIPTION
                "The interface for which this entry contains information
                for an IP multicast group address."

        ::= { mgmdRouterSrcListEntry 3 }

    mgmdRouterSrcListHostAddress OBJECT-TYPE
        SYNTAX      InetAddress (SIZE(4|16))
        MAX-ACCESS  not-accessible
        STATUS     current
        DESCRIPTION
                "The host address to which this entry corresponds.  The
                mgmdRouterCacheSourceFilterMode value for this group address
                and interface indicates whether this host address is
                included or excluded."

        ::= { mgmdRouterSrcListEntry 4 }

    mgmdRouterSrcListExpire OBJECT-TYPE
        SYNTAX     TimeTicks
        MAX-ACCESS read-only
        STATUS     current

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        DESCRIPTION
                "This value indicates the relevance of the SrcList entry,
                whereby a non-zero value indicates this is an INCLUDE state
                value, and a zero value indicates this to be an EXCLUDE
                state value."

        ::= { mgmdRouterSrcListEntry 5 }

    -- conformance information

    mgmdMIBConformance OBJECT IDENTIFIER ::= { mgmdStdMIB 2 }
    mgmdMIBCompliance  OBJECT IDENTIFIER ::= { mgmdMIBConformance 1 }
    mgmdMIBGroups      OBJECT IDENTIFIER ::= { mgmdMIBConformance 2 }

    -- Protocol Version Conformance

    -- Read Compliance statement for IGMPv1 Hosts
    -- IGMPv1 only supports the IPv4 Address Family

    mgmdIgmpV1HostReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-only compliance statement for hosts running IGMPv1
                [RFC1112] and implementing the MGMD MIB.  IGMPv1 hosts must
                support the IPv4 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdHostBaseMIBGroup }

        OBJECT mgmdHostInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

        OBJECT mgmdHostInterfaceVersion
        SYNTAX Unsigned32 (1)
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required.  Only version 1 needs to be
                 supported."

        GROUP mgmdHostExtendedMIBGroup
        DESCRIPTION
                "Supporting this group can be especially useful in
                 an environment with a router that does not support the
                 MGMD MIB."

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    RFC 5519                        MGMD MIB                      April 2009

        ::= { mgmdMIBCompliance 1 }

    -- Read Compliance statement for IGMPv1 Routers
    -- IGMPv1 only supports the IPv4 Address Family

    mgmdIgmpV1RouterReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-only compliance statement for routers running
                IGMPv1 [RFC1112] and implementing the MGMD MIB.  IGMPv1
                routers only support the IPv4 address type.

                Non-accessible index objects that only need IPv4
                support are:

                OBJECT mgmdRouterCacheAddressType
                SYNTAX InetAddressType { ipv4(1) }

                OBJECT mgmdRouterCacheAddress
                SYNTAX InetAddress (SIZE(4))

                OBJECT mgmdRouterInterfaceQuerierType
                SYNTAX InetAddressType { ipv4(1) }

                OBJECT mgmdInverseRouterCacheAddressType
                SYNTAX InetAddressType { ipv4(1) }
                "

        MODULE  -- this module
        MANDATORY-GROUPS { mgmdRouterBaseMIBGroup }

        OBJECT mgmdRouterCacheLastReporter
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "IGMPv1 routers only support IPv4 addresses."

        OBJECT mgmdRouterInterfaceQuerier
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "IGMPv1 routers only support IPv4 addresses."

        OBJECT mgmdInverseRouterCacheAddress
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "IGMPv1 routers only support IPv4 addresses."

        OBJECT mgmdRouterInterfaceVersion
        SYNTAX Unsigned32 (1)

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    RFC 5519                        MGMD MIB                      April 2009

        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required.  Only version 1 needs to
                 be supported."

        OBJECT mgmdRouterInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

        OBJECT mgmdRouterInterfaceQueryInterval
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        ::= { mgmdMIBCompliance 2 }

    -- Write Compliance statement for IGMPv1 Routers
    -- IGMPv1 only supports the IPv4 Address Family

    mgmdIgmpV1RouterWriteMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-create compliance statement for routers running
                IGMPv1 [RFC1112] and implementing the MGMD MIB.  IGMPv1
                routers only support the IPv4 address type.

                Non-accessible index objects that only need IPv4
                support are:

                OBJECT mgmdRouterCacheAddressType
                SYNTAX InetAddressType { ipv4(1) }

                OBJECT mgmdRouterCacheAddress
                SYNTAX InetAddress (SIZE(4))

                OBJECT mgmdRouterInterfaceQuerierType
                SYNTAX InetAddressType { ipv4(1) }

                OBJECT mgmdInverseRouterCacheAddressType
                SYNTAX InetAddressType { ipv4(1) }
                "
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdRouterBaseMIBGroup }

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    RFC 5519                        MGMD MIB                      April 2009

        OBJECT mgmdRouterCacheLastReporter
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "Only IPv4 addresses needed for IGMPv1 router support."

        OBJECT mgmdRouterInterfaceQuerier
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "Only IPv4 addresses needed for IGMPv1 router support."

        OBJECT mgmdInverseRouterCacheAddress
        SYNTAX InetAddress (SIZE(4))
        DESCRIPTION
                "Only IPv4 addresses needed for IGMPv1 router support."

        OBJECT mgmdRouterInterfaceVersion
        SYNTAX Unsigned32 (1)
        DESCRIPTION
                "Write access is not required.  Only version 1 needs to
                 be supported."

        ::= { mgmdMIBCompliance 3 }

    -- Read Compliance statement for IGMPv2 and MLDv1 Hosts
    -- IGMPv2 only supports the IPv4 Address Family
    -- MLDv1 only supports the IPv6 Address Family

    mgmdIgmpV2MldV1HostReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-only compliance statement for hosts running IGMPv2
                [RFC2236] or MLDv1 [RFC2710] and implementing the MGMD
                MIB.  IGMPv2 hosts only support the IPv4 address type and
                MLDv1 hosts only support the IPv6 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdHostBaseMIBGroup,
                           mgmdV2HostMIBGroup
                         }

        OBJECT mgmdHostInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

        OBJECT mgmdHostInterfaceVersion
        SYNTAX Unsigned32 (1..2)

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    RFC 5519                        MGMD MIB                      April 2009

        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required.  Only versions 1 and 2 need
                 to be supported."

        GROUP   mgmdHostExtendedMIBGroup
        DESCRIPTION
                "Supporting this group can be especially useful in an
                 environment with a router that does not support the
                 MGMD MIB."

        ::= { mgmdMIBCompliance 4 }

    -- Write Compliance statement for IGMPv2 and MLDv1 Hosts
    -- IGMPv2 only supports the IPv4 Address Family
    -- MLDv1 only supports the IPv6 Address Family

    mgmdIgmpV2MldV1HostWriteMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-create compliance statement for hosts running
                IGMPv2 [RFC2236] or MLDv1 [RFC2710] and implementing
                the MGMD MIB.  IGMPv2 hosts only support the IPv4 address
                type and MLDv1 hosts only support the IPv6 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdHostBaseMIBGroup,
                           mgmdV2HostMIBGroup }
        OBJECT mgmdHostInterfaceVersion
        SYNTAX Unsigned32 (1..2)
        DESCRIPTION
                "Only versions 1 and 2 need to be supported."

        ::= { mgmdMIBCompliance 5 }

    -- Read Compliance statement for IGMPv2 and MLDv1 Routers
    -- IGMPv2 only supports the IPv4 Address Family
    -- MLDv1 only supports the IPv6 Address Family

    mgmdIgmpV2MldV1RouterReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-only compliance statement for routers running
                IGMPv2 [RFC2236] or MLDv1 [RFC2710] and implementing
                the MGMD MIB.  IGMPv2 routers only support the IPv4
                address type and MLDv1 routers only support the IPv6
                address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdRouterBaseMIBGroup,

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    RFC 5519                        MGMD MIB                      April 2009

                           mgmdV2RouterBaseMIBGroup
                         }

        OBJECT mgmdRouterInterfaceLastMemberQueryInterval
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceRobustness
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceQueryMaxResponseTime
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceVersion
        SYNTAX Unsigned32 (1..2)
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required.  Only versions 1 and 2
                 need to be supported."

        OBJECT mgmdRouterInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

        OBJECT mgmdRouterInterfaceQueryInterval
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        GROUP   mgmdV2ProxyMIBGroup
        DESCRIPTION
                "Write access is not required."

        ::= { mgmdMIBCompliance 6 }

    -- Write Compliance statement for IGMPv2, IGMPv3, MLDv1, and MLDv2
    --   Routers
    -- IGMPv2 and IGMPv3 only support the IPv4 Address Family
    -- MLDv1 and MLDv2 only support the IPv6 Address Family

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    RFC 5519                        MGMD MIB                      April 2009

    mgmdIgmpV2V3MldV1V2RouterWriteMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "A read-create compliance statement for routers running
                IGMPv2 [RFC2236], IGMPv3 [RFC3376], MLDv1 [RFC2710], or
                MLDv2 [RFC3810] and implementing the MGMD MIB.  IGMPv2 and
                IGMPv3 routers only support the IPv4 address type, while
                MLDv1 and MLDv2 routers only support the IPv6 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdRouterBaseMIBGroup,
                           mgmdV2RouterBaseMIBGroup
                         }

        GROUP   mgmdV2ProxyMIBGroup
        DESCRIPTION
                "Read-create access is required."

        ::= { mgmdMIBCompliance 7 }

    -- Read Compliance statement for IGMPv2, IGMPv3, MLDv1, and MLDv2 Hosts
    -- IGMPv2 and IGMPv3 only support the IPv4 Address Family
    -- MLDv1 and MLDv2 only support the IPv6 Address Family

    mgmdIgmpV3MldV2HostReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "The compliance statement for hosts running IGMPv3
                [RFC3376] or MLDv2 [RFC3810] and implementing the
                MGMD MIB.  IGMPv3 hosts only support the IPv4 address
                type and MLDv2 hosts only support the IPv6 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdHostBaseMIBGroup,
                           mgmdV2HostMIBGroup,
                           mgmdV3HostMIBGroup
                         }

        OBJECT mgmdHostInterfaceVersion
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdHostInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

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    RFC 5519                        MGMD MIB                      April 2009

        OBJECT  mgmdHostInterfaceVersion3Robustness
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        GROUP   mgmdHostExtendedMIBGroup
        DESCRIPTION
                "Supporting this group can be especially useful in
                 an environment with a router that does not support the
                 MGMD MIB."

        ::= { mgmdMIBCompliance 8 }

    -- Write Compliance statement for IGMPv2, IGMPv3, MLDv1, and MLDv2 Hosts
    -- IGMPv2 and IGMPv3 only support the IPv4 Address Family
    -- MLDv1 and MLDv2 only support the IPv6 Address Family

    mgmdIgmpV3MldV2HostWriteMIBCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
                "The compliance statement for hosts running IGMPv3
                [RFC3376] or MLDv2 [RFC3810] and implementing the
                MGMD MIB.  IGMPv3 hosts only support the IPv4 address
                type and MLDv2 hosts only support the IPv6 address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdHostBaseMIBGroup,
                           mgmdV2HostMIBGroup,

                           mgmdV3HostMIBGroup
                         }

        GROUP   mgmdHostExtendedMIBGroup
        DESCRIPTION
                "Supporting this group can be especially useful in
                 an environment with a router that does not support the
                 MGMD MIB."

        ::= { mgmdMIBCompliance 9 }

    -- Read Compliance statement for IGMPv2, IGMPv3, MLDv1, and MLDv2
    --   Routers
    -- IGMPv2 and IGMPv3 only support the IPv4 Address Family
    -- MLDv1 and MLDv2 only support the IPv6 Address Family

    mgmdIgmpV3MldV2RouterReadMIBCompliance MODULE-COMPLIANCE
        STATUS  current

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    RFC 5519                        MGMD MIB                      April 2009

        DESCRIPTION
                "A read-only compliance statement for routers running
                IGMPv3 [RFC3376] or MLDv2 [RFC3810] and implementing
                the MGMD MIB.  IGMPv3 routers only support the IPv4
                address type and MLDv2 routers only support the IPv6
                address type."
        MODULE  -- this module
        MANDATORY-GROUPS { mgmdRouterBaseMIBGroup,
                           mgmdV2RouterBaseMIBGroup,
                           mgmdV3RouterMIBGroup
                         }

        OBJECT mgmdRouterInterfaceLastMemberQueryInterval
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceRobustness
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceQueryMaxResponseTime
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceVersion
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        OBJECT mgmdRouterInterfaceStatus
        SYNTAX RowStatus {active(1)}
        MIN-ACCESS read-only
        DESCRIPTION
                "Read-write or read-create access is not required and only
                 the value 'active(1)' needs to be supported."

        OBJECT mgmdRouterInterfaceQueryInterval
        MIN-ACCESS read-only
        DESCRIPTION
                "Write access is not required."

        GROUP   mgmdV2ProxyMIBGroup
        DESCRIPTION
                "Write access is not required."

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    RFC 5519                        MGMD MIB                      April 2009

        ::= { mgmdMIBCompliance 10 }

    -- units of conformance

    mgmdHostBaseMIBGroup OBJECT-GROUP
        OBJECTS { mgmdHostInterfaceStatus,
                  mgmdHostInterfaceVersion
                }
        STATUS  current
        DESCRIPTION
                "The basic collection of objects providing management of
                MGMD version 1, 2, or 3 for hosts."

        ::= { mgmdMIBGroups 1 }

    mgmdRouterBaseMIBGroup OBJECT-GROUP
        OBJECTS { mgmdRouterInterfaceStatus,
                  mgmdRouterInterfaceQueryInterval,
                  mgmdRouterCacheUpTime, mgmdRouterCacheExpiryTime,
                  mgmdRouterInterfaceVersion,
                  mgmdRouterInterfaceJoins, mgmdRouterInterfaceGroups,
                  mgmdRouterCacheLastReporter,
                  mgmdRouterInterfaceQuerierUpTime,
                  mgmdRouterInterfaceQuerierExpiryTime,
                  mgmdRouterInterfaceQuerier,
                  mgmdInverseRouterCacheAddress
                }
        STATUS  current
        DESCRIPTION
                "The basic collection of objects providing management of
                MGMD version 1, 2, or 3 for routers."

        ::= { mgmdMIBGroups 2 }

    mgmdV2HostMIBGroup OBJECT-GROUP
        OBJECTS { mgmdHostInterfaceVersion1QuerierTimer
                }
        STATUS  current
        DESCRIPTION
                "A collection of additional read-only objects for management
                of IGMP version 2 in hosts for MGMD version 2 compliance."

        ::= { mgmdMIBGroups 3 }

    mgmdHostExtendedMIBGroup OBJECT-GROUP
        OBJECTS { mgmdHostCacheLastReporter, mgmdHostCacheUpTime,
                  mgmdHostInterfaceQuerier, mgmdInverseHostCacheAddress }
        STATUS  current

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        DESCRIPTION
                "A collection of optional objects for MGMD hosts."

        ::= { mgmdMIBGroups 4 }

    mgmdV2RouterBaseMIBGroup OBJECT-GROUP
        OBJECTS { mgmdRouterInterfaceWrongVersionQueries,
                  mgmdRouterInterfaceLastMemberQueryCount,
                  mgmdRouterInterfaceStartupQueryCount,
                  mgmdRouterInterfaceStartupQueryInterval,
                  mgmdRouterCacheVersion1HostTimer,
                  mgmdRouterInterfaceQueryMaxResponseTime,
                  mgmdRouterInterfaceRobustness,
                  mgmdRouterInterfaceLastMemberQueryInterval
                }
        STATUS  current
        DESCRIPTION
                "A collection of additional read-only objects for
                management of MGMD version 2 in routers."

        ::= { mgmdMIBGroups 5 }

    mgmdV2ProxyMIBGroup OBJECT-GROUP
        OBJECTS { mgmdRouterInterfaceProxyIfIndex }
        STATUS  current
        DESCRIPTION
                "A collection of additional read-create objects for
                management of MGMD proxy devices."

        ::= { mgmdMIBGroups 6 }

    mgmdV3HostMIBGroup OBJECT-GROUP
        OBJECTS { mgmdHostInterfaceVersion2QuerierTimer,
                  mgmdHostCacheSourceFilterMode,
                  mgmdHostInterfaceVersion3Robustness,
                  mgmdHostSrcListExpire
                }
        STATUS  current
        DESCRIPTION
                "A collection of additional objects for
                management of MGMD version 3 in hosts."

        ::= { mgmdMIBGroups 7 }

    mgmdV3RouterMIBGroup OBJECT-GROUP
        OBJECTS { mgmdRouterCacheSourceFilterMode,
                  mgmdRouterCacheVersion2HostTimer,
                  mgmdRouterCacheExcludeModeExpiryTimer,

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    RFC 5519                        MGMD MIB                      April 2009

                  mgmdRouterSrcListExpire
                }
        STATUS  current
        DESCRIPTION
                "A collection of additional read-only objects for
                management of MGMD version 3 in routers."

        ::= { mgmdMIBGroups 8 }

    END

    6.  Security Considerations

       There are a number of management objects defined in this MIB module
       with a MAX-ACCESS clause of read-write and/or read-create.  Such
       objects may be considered sensitive or vulnerable in some network
       environments.  The support for SET operations in a non-secure
       environment without proper protection can have a negative effect on
       network operations.  These are the tables and objects and their
       sensitivity/vulnerability:

       o  The mgmdRouterInterfaceTable provides read-create access to 2
          values: the mgmdRouterInterfaceStatus and the
          mgmdRouterInterfaceQueryInterval.  The mgmdRouterInterfaceStatus
          presents a remote user with the ability to enable or disable
          multicast support on a given router interface, and therefore
          presents a significant denial-of-service vulnerability.  The
          mgmdRouterInterfaceQueryInterval controls the frequency with which
          host-query packets are sent, providing less of a vulnerability,
          but still requiring secure access control.

       o  The mgmdRouterCacheTable also provides access to read-create
          objects.  The mgmdRouterInterfaceVersion controls the protocol
          conformance of an interface, and is therefore a potential denial-
          of-service vulnerability.  The
          mgmdRouterInterfaceQueryMaxResponseTime, the
          mgmdRouterInterfaceRobustness, and the
          mgmdRouterInterfaceLastMemberQueryInterval are all tuning
          parameters to control the characteristic of the host-query
          packets.  Compromise of these objects can potentially be
          disruptive to local multicast communication.

       o  The mgmdHostInterfaceTable provides a read-create object, the
          mgmdHostInterfaceVersion3Robustness, which controls the robustness
          of the interface to packet loss.  Disabling robustness in the face
          of packet loss could cause denial of service to hosts; however, in
          general this presents a low risk.

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    RFC 5519                        MGMD MIB                      April 2009

       SNMP versions prior to SNMPv3 did not include adequate security.
       Even if the network itself is secure (for example by using IPsec),
       even then, there is no control as to who on the secure network is
       allowed to access and GET/SET (read/change/create/delete) the objects
       in this MIB module.

       It is RECOMMENDED that implementers consider the security features as
       provided by the SNMPv3 framework (see [RFC3410], section 8),
       including full support for the SNMPv3 cryptographic mechanisms (for
       authentication and privacy).

       Further, deployment of SNMP versions prior to SNMPv3 is NOT
       RECOMMENDED.  Instead, it is RECOMMENDED to deploy SNMPv3 and to
       enable cryptographic security.  It is then a customer/operator
       responsibility to ensure that the SNMP entity giving access to an
       instance of this MIB module is properly configured to give access to
       the objects only to those principals (users) that have legitimate
       rights to indeed GET or SET (change/create/delete) them.

    7.  IANA Considerations

       This MIB introduces a new term to refer to two existing multicast
       protocols: Multicast Group Membership Discovery.  It encompasses both
       the IPv4 Multicast discovery protocol, IGMP, and the IPv6 Multicast
       discovery protocol, MLD, as defined in RFCs 2933 [RFC2933] and 3019
       [RFC3019], respectively.

            The MIB module in this document uses the following IANA-assigned
            OBJECT IDENTIFIER value recorded in the SMI Numbers registry:

            Descriptor        OBJECT IDENTIFIER value
            ----------        -----------------------
            mgmdStdMIB        { mib-2 185 }

    8.  Contributors

       The authors of RFC 2933 [RFC2933] and RFC 3019 [RFC3019] from which
       this document is derived are:

          Keith McCloghrie

          Dino Farinacci

          Dave Thaler

          Brian Haberman

          Randy Worzella

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    RFC 5519                        MGMD MIB                      April 2009

    9.  Acknowledgements

       Special thanks to James Lingard, Bill Fenner, and Dave Thaler for
       detailed comments on the MIB.

       Bert Wijnen deserves special recognition for his exhaustive reviews
       and constructive feedback on SNMP and SMI issues related to this MIB.

    10.  References

    10.1.  Normative References

       [RFC1112]  Deering, S., "Host extensions for IP multicasting", STD 5,
                  RFC 1112, August 1989.

       [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
                  Requirement Levels", BCP 14, RFC 2119, March 1997.

       [RFC2236]  Fenner, W., "Internet Group Management Protocol, Version
                  2", RFC 2236, November 1997.

       [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
                  Schoenwaelder, Ed., "Structure of Management Information
                  Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

       [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
                  Schoenwaelder, Ed., "Textual Conventions for SMIv2",
                  STD 58, RFC 2579, April 1999.

       [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
                  "Conformance Statements for SMIv2", STD 58, RFC 2580,
                  April 1999.

       [RFC2710]  Deering, S., Fenner, W., and B. Haberman, "Multicast
                  Listener Discovery (MLD) for IPv6", RFC 2710,
                  October 1999.

       [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
                  MIB", RFC 2863, June 2000.

       [RFC3376]  Cain, B., Deering, S., Kouvelas, I., Fenner, B., and A.
                  Thyagarajan, "Internet Group Management Protocol, Version
                  3", RFC 3376, October 2002.

       [RFC3810]  Vida, R. and L. Costa, "Multicast Listener Discovery
                  Version 2 (MLDv2) for IPv6", RFC 3810, June 2004.

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    RFC 5519                        MGMD MIB                      April 2009

       [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
                  Schoenwaelder, "Textual Conventions for Internet Network
                  Addresses", RFC 4001, February 2005.

    10.2.  Informative References

       [RFC2933]  McCloghrie, K., Farinacci, D., and D. Thaler, "Internet
                  Group Management Protocol MIB", RFC 2933, October 2000.

       [RFC3019]  Haberman, B. and R. Worzella, "IP Version 6 Management
                  Information Base for The Multicast Listener Discovery
                  Protocol", RFC 3019, January 2001.

       [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
                  "Introduction and Applicability Statements for Internet-
                  Standard Management Framework", RFC 3410, December 2002.

       [RFC4605]  Fenner, B., He, H., Haberman, B., and H. Sandick,
                  "Internet Group Management Protocol (IGMP) / Multicast
                  Listener Discovery (MLD)-Based Multicast Forwarding
                  ("IGMP/MLD Proxying")", RFC 4605, August 2006.

    Authors' Addresses

       Julian Chesterfield
       University of Cambridge
       15 JJ Thompson Avenue
       Cambridge CB3 0FD
       UK

       EMail: julian.chesterfield@cl.cam.ac.uk

       Brian Haberman (editor)
       Johns Hopkins University / Applied Physics Laboratory
       11100 Johns Hopkins Road
       Laurel, MD  20723
       USA

       EMail: brian@innovationslab.net

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