rfc3019.txt

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Network Working Group                                        B. Haberman
Request for Comments: 3019                               Nortel Networks
Category: Standards Track                                    R. Worzella
                                                                     IBM
                                                            January 2001


             IP Version 6 Management Information Base for
               The Multicast Listener Discovery Protocol

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) The Internet Society (2001).  All Rights Reserved.


Abstract

   This document defines a portion of the Management Information Base
   (MIB) for use with network management protocols in Internet Protocol
   Version 6 internets.  Specifically, this document is the MIB module
   that defines managed objects for implementations of the Multicast
   Listener Discovery Protocol [RFC2710].

Terminology

   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 [RFC2119].

1. The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

   An overall architecture, described in RFC 2571 [RFC2571].

   Mechanisms for describing and naming objects and events for the
   purpose of management.  The first version of this Structure of
   Management Information (SMI) is called SMIv1 and described in STD 16,




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   RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC 1215
   [RFC1215].  The second version, called SMIv2, is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

   Message protocols for transferring management information.  The first
   version of the SNMP message protocol is called SNMPv1 and described
   in STD 15, RFC 1157 [RFC1157].  A second version of the SNMP message
   protocol, which is not an Internet standards track protocol, is
   called SNMPv2c and described in RFC 1901 [RFC1901] and RFC 1906
   [RFC1906].  The third version of the message protocol is called
   SNMPv3 and described in RFC 1906 [RFC1906], RFC 2572 [RFC2572] and
   RFC 2574 [RFC2574].

   Protocol operations for accessing management information.  The first
   set of protocol operations and associated PDU formats is described in
   STD 15, RFC 1157 [RFC1157].  A second set of protocol operations and
   associated PDU formats is described in RFC 1905 [RFC1905].

   A set of fundamental applications described in RFC 2573 [RFC2573] and
   the view-based access control mechanism described in RFC 2575
   [RFC2575].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [RFC2570].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the mechanisms defined in the SMI.

   This memo specifies a MIB module that is compliant to the SMIv2.  A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations.  The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64).  Some machine-readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process.  However, this loss of
   machine-readable information is not considered to change the
   semantics of the MIB.

2. Overview

   This MIB module contains two tables:

      1. The MLD Interface Table, which contains one row for each
         interface on which MLD is enabled.





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      2. The MLD Cache Table which contains one row for each IPv6
         Multicast group for which there are members on a particular
         interface.

   Both tables are intended to be implemented by hosts and routers. Some
   objects in each table apply to routers only.

3. Definitions

   IPV6-MLD-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE, Counter32, Gauge32,
       Unsigned32, TimeTicks, mib-2     FROM SNMPv2-SMI
       RowStatus, TruthValue            FROM SNMPv2-TC
       InetAddressIPv6             FROM INET-ADDRESS-MIB
       InterfaceIndex, InterfaceIndexOrZero
                                            FROM IF-MIB
       MODULE-COMPLIANCE, OBJECT-GROUP  FROM SNMPv2-CONF;


   mldMIB MODULE-IDENTITY
       LAST-UPDATED "200101250000Z" -- 25 Jan 2001
       ORGANIZATION "IETF IPNGWG Working Group."
       CONTACT-INFO
               " Brian Haberman
                 Nortel Networks
                 4309 Emperor Blvd.
                 Durham, NC  27703
                 USA

                 Phone: [phone]
                 e-mail: [e-mail]"
       DESCRIPTION
               "The MIB module for MLD Management."
       REVISION "200101250000Z" -- 25 Jan 2001
       DESCRIPTION
               "Initial version, published as RFC 3019."
       ::= { mib-2 91 }


   mldMIBObjects     OBJECT IDENTIFIER ::= { mldMIB 1 }
   --
   --  The MLD Interface Table
   --

   mldInterfaceTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF MldInterfaceEntry



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       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
                "The (conceptual) table listing the interfaces on which
                MLD is enabled."
       ::= { mldMIBObjects 1 }

   mldInterfaceEntry OBJECT-TYPE
       SYNTAX     MldInterfaceEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
               "An entry (conceptual row) representing an interface on
               which MLD is enabled."
       INDEX      { mldInterfaceIfIndex }
       ::= { mldInterfaceTable 1 }

   MldInterfaceEntry ::= SEQUENCE {
       mldInterfaceIfIndex               InterfaceIndex,
       mldInterfaceQueryInterval         Unsigned32,
       mldInterfaceStatus                RowStatus,
       mldInterfaceVersion               Unsigned32,
       mldInterfaceQuerier               InetAddressIPv6,
       mldInterfaceQueryMaxResponseDelay Unsigned32,
       mldInterfaceJoins                 Counter32,
       mldInterfaceGroups                Gauge32,
       mldInterfaceRobustness            Unsigned32,
       mldInterfaceLastListenQueryIntvl  Unsigned32,
       mldInterfaceProxyIfIndex          InterfaceIndexOrZero,
       mldInterfaceQuerierUpTime         TimeTicks,
       mldInterfaceQuerierExpiryTime     TimeTicks
   }

   mldInterfaceIfIndex OBJECT-TYPE

       SYNTAX     InterfaceIndex
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
               "The internetwork-layer interface value of the interface
               for which MLD is enabled."
       ::= { mldInterfaceEntry 1 }

   mldInterfaceQueryInterval OBJECT-TYPE
       SYNTAX     Unsigned32
       UNITS      "seconds"
       MAX-ACCESS read-create
       STATUS     current



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       DESCRIPTION
               "The frequency at which MLD Host-Query packets are
               transmitted on this interface."
       DEFVAL     { 125 }
       ::= { mldInterfaceEntry 2 }

   mldInterfaceStatus OBJECT-TYPE
       SYNTAX     RowStatus
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
                "The activation of a row enables MLD on the interface.
                The destruction of a row disables MLD on the interface."
       ::= { mldInterfaceEntry 3 }

   mldInterfaceVersion OBJECT-TYPE
       SYNTAX     Unsigned32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
                "The version of MLD which is running on this interface.
                This object is a place holder to allow for new versions
                of MLD to be introduced.  Version 1 of MLD is defined
                in RFC 2710."
       DEFVAL     { 1 }
       ::= { mldInterfaceEntry 4 }

   mldInterfaceQuerier OBJECT-TYPE
       SYNTAX     InetAddressIPv6 (SIZE (16))
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
                "The address of the MLD Querier on the IPv6 subnet to
                which this interface is attached."
       ::= { mldInterfaceEntry 5 }

   mldInterfaceQueryMaxResponseDelay OBJECT-TYPE
       SYNTAX     Unsigned32
       UNITS      "seconds"
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
               "The maximum query response time advertised in MLD
               queries on this interface."
       DEFVAL     { 10 }
       ::= { mldInterfaceEntry 6 }

   mldInterfaceJoins OBJECT-TYPE



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       SYNTAX     Counter32
       MAX-ACCESS read-only
       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 gives an indication of the amount of MLD activity
               over time."
       ::= { mldInterfaceEntry 7 }

   mldInterfaceGroups OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The current number of entries for this interface in the
               Cache Table."
       ::= { mldInterfaceEntry 8 }

   mldInterfaceRobustness OBJECT-TYPE
       SYNTAX     Unsigned32
       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.  MLD is
               robust to (Robustness Variable-1) packet losses.  The
               discussion of the Robustness Variable is in Section 7.1
               of RFC 2710."
       DEFVAL     { 2 }
       ::= { mldInterfaceEntry 9 }

   mldInterfaceLastListenQueryIntvl OBJECT-TYPE
       SYNTAX     Unsigned32
       UNITS      "seconds"
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
                "The Last Member Query Interval is the Max Response
                Delay 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."
       DEFVAL     { 1 }



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       ::= { mldInterfaceEntry 10 }

   mldInterfaceProxyIfIndex OBJECT-TYPE
       SYNTAX     InterfaceIndexOrZero
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
                "Some devices implement a form of MLD proxying whereby
                memberships learned on the interface represented by this
                row, cause MLD Multicast Listener Reports to be sent on
                the internetwork-layer interface identified by this
                object.  Such a device would implement mldRouterMIBGroup
                only on its router interfaces (those interfaces with
                non-zero mldInterfaceProxyIfIndex).  Typically, the
                value of this object is 0, indicating that no proxying
                is being done."
       DEFVAL     { 0 }
       ::= { mldInterfaceEntry 11 }

   mldInterfaceQuerierUpTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The time since mldInterfaceQuerier was last changed."
       ::= { mldInterfaceEntry 12 }

   mldInterfaceQuerierExpiryTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The time remaining before the Other Querier Present
               Timer expires.  If the local system is the querier,
               the value of this object is zero."
       ::= { mldInterfaceEntry 13 }


   --
   --  The MLD Cache Table
   --

   mldCacheTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF MldCacheEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
                "The (conceptual) table listing the IPv6 multicast



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                groups for which there are members on a particular
                interface."
       ::= { mldMIBObjects 2 }

   mldCacheEntry OBJECT-TYPE
       SYNTAX     MldCacheEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
               "An entry (conceptual row) in the mldCacheTable."
       INDEX      { mldCacheAddress, mldCacheIfIndex }
       ::= { mldCacheTable 1 }

   MldCacheEntry ::= SEQUENCE {
       mldCacheAddress         InetAddressIPv6,
       mldCacheIfIndex            InterfaceIndex,
       mldCacheSelf               TruthValue,
       mldCacheLastReporter   InetAddressIPv6,
       mldCacheUpTime             TimeTicks,
       mldCacheExpiryTime         TimeTicks,
       mldCacheStatus             RowStatus
   }

   mldCacheAddress OBJECT-TYPE