path: root/doc/rfc/rfc2108.txt

Network Working Group                                        K. de Graaf
Request for Comments: 2108                              3Com Corporation
Obsoletes: 1516                                             D. Romascanu
Category: Standards Track                   Madge Networks (Israel) Ltd.
                                                             D. McMaster
                                                   Coloma Communications
                                                           K. McCloghrie
                                                      Cisco Systems Inc.
                                                           February 1997


                     Definitions of Managed Objects
                    for IEEE 802.3 Repeater Devices
                              using SMIv2

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.

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 defines objects for managing IEEE 802.3 10 and 100
   Mb/second baseband repeaters based on IEEE Std 802.3 Section 30, "10
   & 100 Mb/s Management," October 26, 1995.

Table of Contents

   1.  The SNMP Network Management Framework....................  2
   1.1.  Object Definitions.....................................  2
   2.  Overview.................................................  2
   2.1.  Relationship to RFC 1516...............................  2
   2.2.  Repeater Management....................................  3
   2.3.  Structure of the MIB...................................  4
   2.3.1.  Basic Definitions....................................  4
   2.3.2.  Monitor Definitions..................................  4
   2.3.3.  Address Tracking Definitions.........................  4
   2.3.4.  Top N Definitions....................................  4
   2.4.  Relationship to Other MIBs.............................  4
   2.4.1.  Relationship to MIB-II...............................  4
   2.4.1.1.  Relationship to the 'system' group.................  5
   2.4.1.2.  Relationship to the 'interfaces' group.............  5
   3. Definitions...............................................  6



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   4.  Topology Mapping......................................... 75
   5.  Acknowledgements......................................... 79
   6.  References............................................... 80
   7.  Security Considerations.................................. 81
   8.  Authors' Addresses....................................... 81

1.  The SNMP Network Management Framework

   The SNMP Network Management Framework presently consists of three
   major components.  They are:

   o    the SMI, described in RFC 1902 [6] - the mechanisms used
        for describing and naming objects for the purpose of
        management.

   o    the MIB-II, STD 17, RFC 1213 [5] - the core set of
        managed objects for the Internet suite of protocols.

   o    the protocol, STD 15, RFC 1157 [10] and/or RFC 1905
        [9] - the protocol used for accessing managed information.

   Textual conventions are defined in RFC 1903 [7], and conformance
   statements are defined in RFC 1904 [8].

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

1.1.  Object Definitions

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the subset of Abstract Syntax Notation one (ASN.1)
   defined in the SMI.  In particular, each object type is named by an
   OBJECT IDENTIFIER, an administratively assigned name.  The object
   type together with an object instance serves to uniquely identify a
   specific instantiation of the object.  For human convenience, we
   often use a textual string, termed the descriptor, to refer to the
   object type.

2.  Overview

2.1.  Relationship to RFC 1516

   This MIB is intended as a superset of that defined by RFC 1516 [11],
   which will go to historic status.  This MIB includes all of the
   objects contained in that MIB, plus several new ones which provide





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   for significant additional capabilities.  Implementors are encouraged
   to support all applicable conformance groups in order to make the
   best use of the new functionality provided by this MIB.  The new
   objects provide support for:

   o    multiple repeaters

   o    100BASE-T management

   o    port TopN capability

   o    address search and topology mapping

   Certain objects have been deprecated; in particular, those scalar
   objects used for managing a single repeater are now of minimal use
   since they are duplicated in the new multiple- repeater definitions.
   Additional objects have been deprecated based on implementation
   experience with RFC 1516.

2.2.  Repeater Management

   Instances of the object types defined in this memo represent
   attributes of an IEEE 802.3 (Ethernet-like) repeater, as defined by
   Section 9, "Repeater Unit for 10 Mb/s Baseband Networks" in the IEEE
   802.3/ISO 8802-3 CSMA/CD standard [1], and Section 27, "Repeater for
   100 Mb/s Baseband Networks" in the IEEE Standard 802.3u-1995 [2].

   These Repeater MIB objects may be used to manage non-standard
   repeater-like devices, but defining objects to describe
   implementation-specific properties of non-standard repeater- like
   devices is outside the scope of this memo.


   The definitions presented here are based on Section 30.4, "Layer
   Management for 10 and 100 Mb/s Baseband Repeaters" and Annex 30A,
   "GDMO Specificataions for 802.3 managed objects" of [3].

   Implementors of these MIB objects should note that [3] explicitly
   describes when, where, and how various repeater attributes are
   measured.  The IEEE document also describes the effects of repeater
   actions that may be invoked by manipulating instances of the MIB
   objects defined here.

   The counters in this document are defined to be the same as those
   counters in [3], with the intention that the same instrumentation can
   be used to implement both the IEEE and IETF management standards.





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2.3.  Structure of the MIB

   Objects in this MIB are arranged into packages, each of which
   contains a set of related objects within a broad functional category.
   Objects within a package are generally defined under the same OID
   subtree.  These packages are intended for organizational convenience
   ONLY, and have no relation to the conformance groups defined later in
   the document.

2.3.1.  Basic Definitions

   The basic definitions include objects which are applicable to all
   repeaters: status, parameter and control objects for each repeater
   within the managed system, for the port groups within the system, and
   for the individual ports themselves.

2.3.2.  Monitor Definitions

   The monitor definitions include monitoring statistics for each
   repeater within the system and for individual ports.

2.3.3.  Address Tracking Definitions

   This collection includes objects for tracking the MAC addresses of
   the DTEs attached to the ports within the system and for mapping the
   topology of a network.

   Note:  These definitions are based on a technology which has been
   patented by Hewlett-Packard Company.  HP has granted rights to this
   technology to implementors of this MIB.  See [12] and [13] for
   details.

2.3.4.  Top N Definitions

   These objects may be used for tracking the ports with the most
   activity within the system or within particular repeaters.

2.4.  Relationship to Other MIBs

2.4.1.  Relationship to MIB-II

   It is assumed that a repeater implementing this MIB will also
   implement (at least) the 'system' group defined in MIB-II [5].








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2.4.1.1.  Relationship to the 'system' group

   In MIB-II, the 'system' group is defined as being mandatory for all
   systems such that each managed entity contains one instance of each
   object in the 'system' group.  Thus, those objects apply to the
   entity even if the entity's sole functionality is management of
   repeaters.

2.4.1.2.  Relationship to the 'interfaces' group

   In MIB-II, the 'interfaces' group is defined as being mandatory for
   all systems and contains information on an entity's interfaces, where
   each interface is thought of as being attached to a 'subnetwork'.
   (Note that this term is not to be confused with 'subnet' which refers
   to an addressing partitioning scheme used in the Internet suite of
   protocols.)

   This Repeater MIB uses the notion of ports on a repeater.  The
   concept of a MIB-II interface has NO specific relationship to a
   repeater's port.  Therefore, the 'interfaces' group applies only to
   the one (or more) network interfaces on which the entity managing the
   repeater sends and receives management protocol operations, and does
   not apply to the repeater's ports.

   This is consistent with the physical-layer nature of a repeater.  A
   repeater is a bitwise store-and-forward device.  It recognizes
   activity and bits, but does not process incoming data based on any
   packet-related information (such as checksum or addresses).  A
   repeater has no MAC address, no MAC implementation, and does not pass
   packets up to higher-level protocol entities for processing.

   (When a network management entity is observing a repeater, it may
   appear as though the repeater is passing packets to a higher-level
   protocol entity.  However, this is only a means of implementing
   management, and this passing of management information is not part of
   the repeater functionality.)















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3. Definitions

   SNMP-REPEATER-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       Counter32, Counter64, Integer32, Gauge32, TimeTicks,
       OBJECT-TYPE, MODULE-IDENTITY, NOTIFICATION-TYPE, mib-2
           FROM SNMPv2-SMI
       TimeStamp, DisplayString, MacAddress, TEXTUAL-CONVENTION,
       RowStatus, TestAndIncr
           FROM SNMPv2-TC
       OBJECT-GROUP, MODULE-COMPLIANCE
           FROM SNMPv2-CONF
       OwnerString
           FROM IF-MIB;


   snmpRptrMod MODULE-IDENTITY
       LAST-UPDATED    "9609140000Z"
       ORGANIZATION    "IETF HUB MIB Working Group"
       CONTACT-INFO
           "WG E-mail: hubmib@hprnd.rose.hp.com

                Chair: Dan Romascanu
               Postal: Madge Networks (Israel) Ltd.
                       Atidim Technology Park, Bldg. 3
                       Tel Aviv 61131, Israel
                  Tel: 972-3-6458414, 6458458
                  Fax: 972-3-6487146
               E-mail: dromasca@madge.com

               Editor: Kathryn de Graaf
               Postal: 3Com Corporation
                       118 Turnpike Rd.
                       Southborough, MA 01772 USA
                  Tel: (508)229-1627
                  Fax: (508)490-5882
               E-mail: kdegraaf@isd.3com.com"
       DESCRIPTION
           "Management information for 802.3 repeaters.

           The following references are used throughout
           this MIB module:

           [IEEE 802.3 Std]
               refers to IEEE 802.3/ISO 8802-3 Information
               processing systems - Local area networks -
               Part 3: Carrier sense multiple access with



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               collision detection (CSMA/CD) access method
               and physical layer specifications (1993).

           [IEEE 802.3 Mgt]
               refers to IEEE 802.3u-1995, '10 Mb/s &
               100 Mb/s Management, Section 30,'
               Supplement to ANSI/IEEE 802.3.

           The following terms are used throughout this
           MIB module.  For complete formal definitions,
           the IEEE 802.3 standards should be consulted
           wherever possible:

           System - A managed entity compliant with this
           MIB, and incorporating at least one managed
           802.3 repeater.

           Chassis - An enclosure for one managed repeater,
           part of a managed repeater, or several managed
           repeaters.  It typically contains an integral
           power supply and a variable number of available
           module slots.

           Repeater-unit - The portion of the repeater set
           that is inboard of the physical media interfaces.
           The physical media interfaces (MAUs, AUIs) may be
           physically separated from the repeater-unit, or
           they may be integrated into the same physical
           package.

           Trivial repeater-unit - An isolated port that can
           gather statistics.

           Group - A recommended, but optional, entity
           defined by the IEEE 802.3 management standard,
           in order to support a modular numbering scheme.
           The classical example allows an implementor to
           represent field-replaceable units as groups of
           ports, with the port numbering matching the
           modular hardware implementation.

           System interconnect segment - An internal
           segment allowing interconnection of ports
           belonging to different physical entities
           into the same logical manageable repeater.
           Examples of implementation might be
           backplane busses in modular hubs, or
           chaining cables in stacks of hubs.



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           Stack - A scalable system that may include
           managed repeaters, in which modularity is
           achieved by interconnecting a number of
           different chassis.

           Module - A building block in a modular
           chassis.  It typically maps into one 'slot';
           however, the range of configurations may be
           very large, with several modules entering
           one slot, or one module covering several
           slots.
           "
       REVISION "9309010000Z"
       DESCRIPTION
           "Published as RFC 1516"
       REVISION "9210010000Z"
       DESCRIPTION
           "Published as RFC 1368"
       ::= { snmpDot3RptrMgt 5 }



   snmpDot3RptrMgt OBJECT IDENTIFIER ::= { mib-2 22 }


   OptMacAddr ::= TEXTUAL-CONVENTION
       DISPLAY-HINT    "1x:"
       STATUS          current
       DESCRIPTION
           "Either a 6 octet address in the `canonical'
           order defined by IEEE 802.1a, i.e., as if it
           were transmitted least significant bit first
           if a value is available or a zero length string."
       REFERENCE
           "See MacAddress in SNMPv2-TC. The only difference
           is that a zero length string is allowed as a value
           for OptMacAddr and not for MacAddress."
       SYNTAX OCTET STRING (SIZE (0 | 6))



   -- Basic information at the repeater, group, and port level.

   rptrBasicPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 1 }
     rptrRptrInfo
           OBJECT IDENTIFIER ::= { rptrBasicPackage 1 }
     rptrGroupInfo



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           OBJECT IDENTIFIER ::= { rptrBasicPackage 2 }
     rptrPortInfo
           OBJECT IDENTIFIER ::= { rptrBasicPackage 3 }
     rptrAllRptrInfo
           OBJECT IDENTIFIER ::= { rptrBasicPackage 4 }

   -- Monitoring information at the repeater, group, and port level.
   rptrMonitorPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 2 }
     rptrMonitorRptrInfo
           OBJECT IDENTIFIER ::= { rptrMonitorPackage 1 }
     rptrMonitorGroupInfo
           OBJECT IDENTIFIER ::= { rptrMonitorPackage 2 }
     rptrMonitorPortInfo
           OBJECT IDENTIFIER ::= { rptrMonitorPackage 3 }
     rptrMonitorAllRptrInfo
           OBJECT IDENTIFIER ::= { rptrMonitorPackage 4 }

   -- Address tracking information at the repeater, group,
   -- and port level.
   rptrAddrTrackPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 3 }
     rptrAddrTrackRptrInfo
           OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 1 }
     rptrAddrTrackGroupInfo
           -- this subtree is currently unused
           OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 2 }
     rptrAddrTrackPortInfo
           OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 3 }

   -- TopN information.
   rptrTopNPackage
           OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 4 }
     rptrTopNRptrInfo
           -- this subtree is currently unused
           OBJECT IDENTIFIER ::= { rptrTopNPackage 1 }
     rptrTopNGroupInfo
           -- this subtree is currently unused
           OBJECT IDENTIFIER ::= { rptrTopNPackage 2 }
     rptrTopNPortInfo
           OBJECT IDENTIFIER ::= { rptrTopNPackage 3 }


   -- Old version of basic information at the repeater level.
   --
   -- In a system containing a single managed repeater,
   -- configuration, status, and control objects for the overall
   -- repeater.



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   --
   -- The objects contained under the rptrRptrInfo subtree are
   -- intended for backwards compatibility with implementations of
   -- RFC 1516 [11].  In newer implementations (both single- and
   -- multiple-repeater implementations) the rptrInfoTable should
   -- be implemented.  It is the preferred source of this information,
   -- as it contains the values for all repeaters managed by the
   -- agent.  In all cases, the objects in the rptrRptrInfo subtree
   -- are duplicates of the corresponding objects in the first entry
   -- of the rptrInfoTable.

   rptrGroupCapacity OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The rptrGroupCapacity is the number of groups
               that can be contained within the repeater.  Within
               each managed repeater, the groups are uniquely
               numbered in the range from 1 to rptrGroupCapacity.

               Some groups may not be present in the repeater, in
               which case the actual number of groups present
               will be less than rptrGroupCapacity.  The number
               of groups present will never be greater than
               rptrGroupCapacity.

               Note:  In practice, this will generally be the
               number of field-replaceable units (i.e., modules,
               cards, or boards) that can fit in the physical
               repeater enclosure, and the group numbers will
               correspond to numbers marked on the physical
               enclosure."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.3,
               aRepeaterGroupCapacity."
       ::= { rptrRptrInfo 1 }

   rptrOperStatus OBJECT-TYPE
       SYNTAX      INTEGER {
                     other(1),            -- undefined or unknown
                     ok(2),               -- no known failures
                     rptrFailure(3),      -- repeater-related failure
                     groupFailure(4),     -- group-related failure
                     portFailure(5),      -- port-related failure
                     generalFailure(6)    -- failure, unspecified type



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                   }
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The rptrOperStatus object indicates the
               operational state of the repeater.  The
               rptrHealthText object may be consulted for more
               specific information about the state of the
               repeater's health.

               In the case of multiple kinds of failures (e.g.,
               repeater failure and port failure), the value of
               this attribute shall reflect the highest priority
               failure in the following order, listed highest
               priority first:

                   rptrFailure(3)
                   groupFailure(4)
                   portFailure(5)
                   generalFailure(6)."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.5, aRepeaterHealthState."
       ::= { rptrRptrInfo 2 }

   rptrHealthText OBJECT-TYPE
       SYNTAX      DisplayString (SIZE (0..255))
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The health text object is a text string that
               provides information relevant to the operational
               state of the repeater.  Agents may use this string
               to provide detailed information on current
               failures, including how they were detected, and/or
               instructions for problem resolution.  The contents
               are agent-specific."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.6, aRepeaterHealthText."
       ::= { rptrRptrInfo 3 }

   rptrReset OBJECT-TYPE
       SYNTAX      INTEGER {
                     noReset(1),
                     reset(2)



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                   }
       MAX-ACCESS  read-write
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               Setting this object to reset(2) causes a
               transition to the START state of Fig 9-2 in
               section 9 [IEEE 802.3 Std] for a 10Mb/s repeater,
               and the START state of Fig 27-2 in section 27
               of that standard for a 100Mb/s repeater.

               Setting this object to noReset(1) has no effect.
               The agent will always return the value noReset(1)
               when this object is read.

               After receiving a request to set this variable to
               reset(2), the agent is allowed to delay the reset
               for a short period.  For example, the implementor
               may choose to delay the reset long enough to allow
               the SNMP response to be transmitted.  In any
               event, the SNMP response must be transmitted.

               This action does not reset the management counters
               defined in this document nor does it affect the
               portAdminStatus parameters.  Included in this
               action is the execution of a disruptive Self-Test
               with the following characteristics:  a) The nature
               of the tests is not specified.  b) The test resets
               the repeater but without affecting management
               information about the repeater.  c) The test does
               not inject packets onto any segment.  d) Packets
               received during the test may or may not be
               transferred.  e) The test does not interfere with
               management functions.

               After performing this self-test, the agent will
               update the repeater health information (including
               rptrOperStatus and rptrHealthText), and send a
               rptrHealth trap."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.2.1, acResetRepeater."
       ::= { rptrRptrInfo 4 }

   rptrNonDisruptTest OBJECT-TYPE
       SYNTAX      INTEGER {
                     noSelfTest(1),
                     selfTest(2)



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                   }
       MAX-ACCESS  read-write
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               Setting this object to selfTest(2) causes the
               repeater to perform a agent-specific, non-
               disruptive self-test that has the following
               characteristics:  a) The nature of the tests is
               not specified.  b) The test does not change the
               state of the repeater or management information
               about the repeater.  c) The test does not inject
               packets onto any segment.  d) The test does not
               prevent the relay of any packets.  e) The test
               does not interfere with management functions.

               After performing this test, the agent will update
               the repeater health information (including
               rptrOperStatus and rptrHealthText) and send a
               rptrHealth trap.

               Note that this definition allows returning an
               'okay' result after doing a trivial test.

               Setting this object to noSelfTest(1) has no
               effect.  The agent will always return the value
               noSelfTest(1) when this object is read."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.2.2,
               acExecuteNonDisruptiveSelfTest."
       ::= { rptrRptrInfo 5 }

   rptrTotalPartitionedPorts OBJECT-TYPE
       SYNTAX      Gauge32
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               This object returns the total number of ports in
               the repeater whose current state meets all three
               of the following criteria:  rptrPortOperStatus
               does not have the value notPresent(3),
               rptrPortAdminStatus is enabled(1), and
               rptrPortAutoPartitionState is autoPartitioned(2)."
       ::= { rptrRptrInfo 6 }




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   -- Basic information at the group level.
   --
   -- Configuration and status objects for each
   -- managed group in the system, independent
   -- of whether there is one or more managed
   -- repeater-units in the system.

   rptrGroupTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrGroupEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "Table of descriptive and status information about
               the groups of ports."
       ::= { rptrGroupInfo 1 }

   rptrGroupEntry OBJECT-TYPE
       SYNTAX      RptrGroupEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "An entry in the table, containing information
               about a single group of ports."
       INDEX    { rptrGroupIndex }
       ::= { rptrGroupTable 1 }

   RptrGroupEntry ::=
       SEQUENCE {
           rptrGroupIndex
               Integer32,
           rptrGroupDescr
               DisplayString,
           rptrGroupObjectID
               OBJECT IDENTIFIER,
           rptrGroupOperStatus
               INTEGER,
           rptrGroupLastOperStatusChange
               TimeTicks,
           rptrGroupPortCapacity
               Integer32
       }

   rptrGroupIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the group within the



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               system for which this entry contains
               information."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.2.1.1, aGroupID."
       ::= { rptrGroupEntry 1 }

   rptrGroupDescr OBJECT-TYPE
       SYNTAX      DisplayString (SIZE (0..255))
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               A textual description of the group.  This value
               should include the full name and version
               identification of the group's hardware type and
               indicate how the group is differentiated from
               other types of groups in the repeater.  Plug-in
               Module, Rev A' or 'Barney Rubble 10BASE-T 4-port
               SIMM socket Version 2.1' are examples of valid
               group descriptions.

               It is mandatory that this only contain printable
               ASCII characters."
       ::= { rptrGroupEntry 2 }

   rptrGroupObjectID OBJECT-TYPE
       SYNTAX      OBJECT IDENTIFIER
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The vendor's authoritative identification of the
               group.  This value may be allocated within the SMI
               enterprises subtree (1.3.6.1.4.1) and provides a
               straight-forward and unambiguous means for
               determining what kind of group is being managed.

               For example, this object could take the value
               1.3.6.1.4.1.4242.1.2.14 if vendor 'Flintstones,
               Inc.' was assigned the subtree 1.3.6.1.4.1.4242,
               and had assigned the identifier
               1.3.6.1.4.1.4242.1.2.14 to its 'Wilma Flintstone
               6-Port FOIRL Plug-in Module.'"
       ::= { rptrGroupEntry 3 }

   rptrGroupOperStatus OBJECT-TYPE
       SYNTAX      INTEGER {
                     other(1),



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                     operational(2),
                     malfunctioning(3),
                     notPresent(4),
                     underTest(5),
                     resetInProgress(6)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "An object that indicates the operational status
               of the group.

               A status of notPresent(4) indicates that the group
               is temporarily or permanently physically and/or
               logically not a part of the repeater.  It is an
               implementation-specific matter as to whether the
               agent effectively removes notPresent entries from
               the table.

               A status of operational(2) indicates that the
               group is functioning, and a status of
               malfunctioning(3) indicates that the group is
               malfunctioning in some way."
       ::= { rptrGroupEntry 4 }

   rptrGroupLastOperStatusChange OBJECT-TYPE
       SYNTAX      TimeTicks
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               An object that contains the value of sysUpTime at
               the time when the last of the following occurred:
                 1) the agent cold- or warm-started;
                 2) the row for the group was created (such
                    as when the group was added to the system); or
                 3) the value of rptrGroupOperStatus for the
                    group changed.

               A value of zero indicates that the group's
               operational status has not changed since the agent
               last restarted."
       ::= { rptrGroupEntry 5 }

   rptrGroupPortCapacity OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only



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       STATUS      current
       DESCRIPTION
               "The rptrGroupPortCapacity is the number of ports
               that can be contained within the group.  Valid
               range is 1-2147483647.  Within each group, the
               ports are uniquely numbered in the range from 1 to
               rptrGroupPortCapacity.

               Some ports may not be present in the system, in
               which case the actual number of ports present
               will be less than the value of rptrGroupPortCapacity.
               The number of ports present in the group will never
               be greater than the value of rptrGroupPortCapacity.

               Note:  In practice, this will generally be the
               number of ports on a module, card, or board, and
               the port numbers will correspond to numbers marked
               on the physical embodiment."
       REFERENCE
               "IEEE 802.3 Mgt, 30.4.2.1.2, aGroupPortCapacity."
       ::= { rptrGroupEntry 6 }


   -- Basic information at the port level.
   --
   -- Configuration and status objects for
   -- each managed repeater port in the system,
   -- independent of whether there is one or more
   -- managed repeater-units in the system.

   rptrPortTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "Table of descriptive and status information about
               the repeater ports in the system.  The number of
               entries is independent of the number of repeaters
               in the managed system."
       ::= { rptrPortInfo 1 }

   rptrPortEntry OBJECT-TYPE
       SYNTAX      RptrPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "An entry in the table, containing information
               about a single port."



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       INDEX    { rptrPortGroupIndex, rptrPortIndex }
       ::= { rptrPortTable 1 }

   RptrPortEntry ::=
       SEQUENCE {
           rptrPortGroupIndex
               Integer32,
           rptrPortIndex
               Integer32,
           rptrPortAdminStatus
               INTEGER,
           rptrPortAutoPartitionState
               INTEGER,
           rptrPortOperStatus
               INTEGER,
           rptrPortRptrId
               Integer32
       }

   rptrPortGroupIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrPortEntry 1 }

   rptrPortIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information.  This
               identifies the port independently from the repeater
               it may be attached to.  The numbering scheme for
               ports is implementation specific; however, this
               value can never be greater than
               rptrGroupPortCapacity for the associated group."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.1, aPortID."
       ::= { rptrPortEntry 2 }

   rptrPortAdminStatus OBJECT-TYPE
       SYNTAX      INTEGER {
                     enabled(1),
                     disabled(2)



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                   }
       MAX-ACCESS  read-write
       STATUS      current
       DESCRIPTION
               "Setting this object to disabled(2) disables the
               port.  A disabled port neither transmits nor
               receives.  Once disabled, a port must be
               explicitly enabled to restore operation.  A port
               which is disabled when power is lost or when a
               reset is exerted shall remain disabled when normal
               operation resumes.

               The admin status takes precedence over auto-
               partition and functionally operates between the
               auto-partition mechanism and the AUI/PMA.

               Setting this object to enabled(1) enables the port
               and exerts a BEGIN on the port's auto-partition
               state machine.

               (In effect, when a port is disabled, the value of
               rptrPortAutoPartitionState for that port is frozen
               until the port is next enabled.  When the port
               becomes enabled, the rptrPortAutoPartitionState
               becomes notAutoPartitioned(1), regardless of its
               pre-disabling state.)"
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.2, aPortAdminState
               and 30.4.3.2.1, acPortAdminControl."
       ::= { rptrPortEntry 3 }

   rptrPortAutoPartitionState OBJECT-TYPE
       SYNTAX      INTEGER {
                     notAutoPartitioned(1),
                     autoPartitioned(2)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The autoPartitionState flag indicates whether the
               port is currently partitioned by the repeater's
               auto-partition protection.

               The conditions that cause port partitioning are
               specified in partition state machine in Sections
               9 and 27 of [IEEE 802.3 Std].  They are not
               differentiated here."
       REFERENCE



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               "[IEEE 802.3 Mgt], 30.4.3.1.3, aAutoPartitionState."
       ::= { rptrPortEntry 4 }

   rptrPortOperStatus  OBJECT-TYPE
       SYNTAX      INTEGER {
                     operational(1),
                     notOperational(2),
                     notPresent(3)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object indicates the port's operational
               status.  The notPresent(3) status indicates the
               port is physically removed (note this may or may
               not be possible depending on the type of port.)
               The operational(1) status indicates that the port
               is enabled (see rptrPortAdminStatus) and working,
               even though it might be auto-partitioned (see
               rptrPortAutoPartitionState).

               If this object has the value operational(1) and
               rptrPortAdminStatus is set to disabled(2), it is
               expected that this object's value will soon change
               to notOperational(2)."
       ::= { rptrPortEntry 5 }

   rptrPortRptrId OBJECT-TYPE
       SYNTAX      Integer32 (0..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the repeater to
               which this port belongs.  The repeater
               identified by a particular value of this object
               is the same as that identified by the same
               value of rptrInfoId.  A value of zero
               indicates that this port currently is not
               a member of any repeater."
       ::= { rptrPortEntry 6 }


   -- New version of basic information at the repeater level.
   --
   -- Configuration, status, and control objects for
   -- each managed repeater in the system.

   rptrInfoTable OBJECT-TYPE



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       SYNTAX      SEQUENCE OF RptrInfoEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A table of information about each
               non-trivial repeater. The number of entries
               depends on the physical configuration of the
               managed system."
       ::= { rptrAllRptrInfo 1 }

   rptrInfoEntry OBJECT-TYPE
       SYNTAX      RptrInfoEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "An entry in the table, containing information
               about a single non-trivial repeater."
       INDEX    { rptrInfoId }
       ::= { rptrInfoTable 1 }

   RptrInfoEntry ::=
       SEQUENCE {
           rptrInfoId
               Integer32,
           rptrInfoRptrType
               INTEGER,
           rptrInfoOperStatus
               INTEGER,
           rptrInfoReset
               INTEGER,
           rptrInfoPartitionedPorts
               Gauge32,
           rptrInfoLastChange
               TimeStamp
       }

   rptrInfoId OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the repeater for which
               this entry contains information."
       ::= { rptrInfoEntry 1 }

   rptrInfoRptrType OBJECT-TYPE
       SYNTAX      INTEGER {
                     other(1),                -- undefined or unknown



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                     tenMb(2),
                     onehundredMbClassI(3),
                     onehundredMbClassII(4)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The rptrInfoRptrType returns a value that identifies
               the CSMA/CD repeater type."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.2, aRepeaterType."
       ::= { rptrInfoEntry 2 }

   rptrInfoOperStatus OBJECT-TYPE
       SYNTAX      INTEGER {
                     other(1),
                     ok(2),
                     failure(3)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The rptrInfoOperStatus object indicates the
               operational state of the repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.5, aRepeaterHealthState."
       ::= { rptrInfoEntry 3 }

   rptrInfoReset OBJECT-TYPE
       SYNTAX      INTEGER {
                     noReset(1),
                     reset(2)
                   }
       MAX-ACCESS  read-write
       STATUS      current
       DESCRIPTION
               "Setting this object to reset(2) causes a
               transition to the START state of Fig 9-2 in
               section 9 [IEEE 802.3 Std] for a 10Mb/s repeater,
               and to the START state of Fig 27-2 in section 27
               of that standard for a 100Mb/s repeater.

               Setting this object to noReset(1) has no effect.
               The agent will always return the value noReset(1)
               when this object is read.

               After receiving a request to set this variable to
               reset(2), the agent is allowed to delay the reset



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               for a short period.  For example, the implementor
               may choose to delay the reset long enough to allow
               the SNMP response to be transmitted.  In any
               event, the SNMP response must be transmitted.

               This action does not reset the management counters
               defined in this document nor does it affect the
               portAdminStatus parameters.  Included in this
               action is the execution of a disruptive Self-Test
               with the following characteristics:  a) The nature
               of the tests is not specified.  b) The test resets
               the repeater but without affecting management
               information about the repeater.  c) The test does
               not inject packets onto any segment.  d) Packets
               received during the test may or may not be
               transferred.  e) The test does not interfere with
               management functions.

               After performing this self-test, the agent will
               update the repeater health information (including
               rptrInfoOperStatus), and send a rptrInfoResetEvent
               notification."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.2.1, acResetRepeater."
       ::= { rptrInfoEntry 4 }

   rptrInfoPartitionedPorts OBJECT-TYPE
       SYNTAX      Gauge32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object returns the total number of ports in
               the repeater whose current state meets all three
               of the following criteria:  rptrPortOperStatus
               does not have the value notPresent(3),
               rptrPortAdminStatus is enabled(1), and
               rptrPortAutoPartitionState is autoPartitioned(2)."
       ::= { rptrInfoEntry 5 }

   rptrInfoLastChange OBJECT-TYPE
       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The value of sysUpTime when any of the following
               conditions occurred:
                 1) agent cold- or warm-started;
                 2) this instance of repeater was created



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                    (such as when a device or module was
                    added to the system);
                 3) a change in the value of rptrInfoOperStatus;
                 4) ports were added or removed as members of
                    the repeater; or
                 5) any of the counters associated with this
                    repeater had a discontinuity."
       ::= { rptrInfoEntry 6 }




   --
   -- Old version of statistics at the repeater level.
   --
   -- Performance monitoring statistics for the repeater
   --
   -- In a system containing a single managed repeater-unit,
   -- the statistics object for the repeater-unit.

   -- The objects contained under the rptrMonitorRptrInfo subtree are
   -- intended for backwards compatibility with implementations of
   -- RFC 1516 [11].  In newer implementations (both single- and
   -- multiple-repeater implementations), the rptrMonitorTable will
   -- be implemented.  It is the preferred source of this information,
   -- as it contains the values for all repeaters managed by the
   -- agent.  In all cases, the objects in the rptrMonitorRptrInfo
   -- subtree are duplicates of the corresponding objects in the
   -- first entry of the rptrMonitorTable.


   rptrMonitorTransmitCollisions OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               For a clause 9 (10Mb/s) repeater, this counter
               is incremented every time the repeater state
               machine enters the TRANSMIT COLLISION state
               from any state other than ONE PORT LEFT
               (Ref: Fig 9-2 [IEEE 802.3 Std]).

               For a clause 27 repeater, this counter is
               incremented every time the repeater core state
               diagram enters the Jam state as a result of
               Activity(ALL) > 1 (fig 27-2 [IEEE 802.3 Std]).



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               The approximate minimum time for rollover of this
               counter is 16 hours in a 10Mb/s repeater and 1.6
               hours in a 100Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.8, aTransmitCollisions."
       ::= { rptrMonitorRptrInfo 1 }


   -- Statistics at the group level.
   --
   -- In a system containing a single managed repeater-unit,
   -- the statistics objects for each group.

   rptrMonitorGroupTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrMonitorGroupEntry
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               Table of performance and error statistics for the
               groups within the repeater.  The number of entries
               is the same as that in the rptrGroupTable."
       ::= { rptrMonitorGroupInfo 1 }

   rptrMonitorGroupEntry OBJECT-TYPE
       SYNTAX    RptrMonitorGroupEntry
       MAX-ACCESS  not-accessible
       STATUS    deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               An entry in the table, containing total
               performance and error statistics for a single
               group.  Regular retrieval of the information in
               this table provides a means of tracking the
               performance and health of the networked devices
               attached to this group's ports.

               The counters in this table are redundant in the
               sense that they are the summations of information
               already available through other objects.  However,
               these sums provide a considerable optimization of
               network management traffic over the otherwise
               necessary retrieval of the individual counters
               included in each sum.

               Note:  Group-level counters are



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               deprecated in this MIB.  It is recommended
               that management applications instead use
               the repeater-level counters contained in
               the rptrMonTable."
       INDEX    { rptrMonitorGroupIndex }
       ::= { rptrMonitorGroupTable 1 }

   RptrMonitorGroupEntry ::=
       SEQUENCE {
           rptrMonitorGroupIndex
               Integer32,
           rptrMonitorGroupTotalFrames
               Counter32,
           rptrMonitorGroupTotalOctets
               Counter32,
           rptrMonitorGroupTotalErrors
               Counter32
       }

   rptrMonitorGroupIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               This object identifies the group within the
               repeater for which this entry contains
               information."
       ::= { rptrMonitorGroupEntry 1 }

   rptrMonitorGroupTotalFrames OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The total number of frames of valid frame length
               that have been received on the ports in this group
               and for which the FCSError and CollisionEvent
               signals were not asserted.  This counter is the
               summation of the values of the
               rptrMonitorPortReadableFrames counters for all of
               the ports in the group.

               This statistic provides one of the parameters
               necessary for obtaining the packet error rate.



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               The approximate minimum time for rollover of this
               counter is 80 hours in a 10Mb/s repeater."
       ::= { rptrMonitorGroupEntry 2 }

   rptrMonitorGroupTotalOctets OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The total number of octets contained in the valid
               frames that have been received on the ports in
               this group.  This counter is the summation of the
               values of the rptrMonitorPortReadableOctets
               counters for all of the ports in the group.

               This statistic provides an indicator of the total
               data transferred.  The approximate minimum time
               for rollover of this counter is 58 minutes in a
               10Mb/s repeater."
       ::= { rptrMonitorGroupEntry 3 }

   rptrMonitorGroupTotalErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               The total number of errors which have occurred on
               all of the ports in this group.  This counter is
               the summation of the values of the
               rptrMonitorPortTotalErrors counters for all of the
               ports in the group."
       ::= { rptrMonitorGroupEntry 4 }


   -- Statistics at the port level.
   --

   rptrMonitorPortTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrMonitorPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "Table of performance and error statistics for the
               ports.  The number of entries is the same as that



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               in the rptrPortTable.

               The columnar object rptrMonitorPortLastChange
               is used to indicate possible discontinuities
               of counter type columnar objects in the table."
       ::= { rptrMonitorPortInfo 1 }

   rptrMonitorPortEntry OBJECT-TYPE
       SYNTAX      RptrMonitorPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "An entry in the table, containing performance and
               error statistics for a single port."
       INDEX    { rptrMonitorPortGroupIndex, rptrMonitorPortIndex }
       ::= { rptrMonitorPortTable 1 }

   RptrMonitorPortEntry ::=
       SEQUENCE {
           rptrMonitorPortGroupIndex
               Integer32,
           rptrMonitorPortIndex
               Integer32,
           rptrMonitorPortReadableFrames
               Counter32,
           rptrMonitorPortReadableOctets
               Counter32,
           rptrMonitorPortFCSErrors
               Counter32,
           rptrMonitorPortAlignmentErrors
               Counter32,
           rptrMonitorPortFrameTooLongs
               Counter32,
           rptrMonitorPortShortEvents
               Counter32,
           rptrMonitorPortRunts
               Counter32,
           rptrMonitorPortCollisions
               Counter32,
           rptrMonitorPortLateEvents
               Counter32,
           rptrMonitorPortVeryLongEvents
               Counter32,
           rptrMonitorPortDataRateMismatches
               Counter32,
           rptrMonitorPortAutoPartitions
               Counter32,
           rptrMonitorPortTotalErrors



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               Counter32,
           rptrMonitorPortLastChange
               TimeStamp
       }

   rptrMonitorPortGroupIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrMonitorPortEntry 1 }

   rptrMonitorPortIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.1, aPortID."
       ::= { rptrMonitorPortEntry 2 }

   rptrMonitorPortReadableFrames OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object is the number of frames of valid
               frame length that have been received on this port.
               This counter is incremented by one for each frame
               received on this port whose OctetCount is greater
               than or equal to minFrameSize and less than or
               equal to maxFrameSize (Ref: IEEE 802.3 Std,
               4.4.2.1) and for which the FCSError and
               CollisionEvent signals are not asserted.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               This statistic provides one of the parameters
               necessary for obtaining the packet error rate.
               The approximate minimum time for rollover of this
               counter is 80 hours at 10Mb/s."
       REFERENCE



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               "[IEEE 802.3 Mgt], 30.4.3.1.4, aReadableFrames."
       ::= { rptrMonitorPortEntry 3 }

   rptrMonitorPortReadableOctets OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object is the number of octets contained in
               valid frames that have been received on this port.
               This counter is incremented by OctetCount for each
               frame received on this port which has been
               determined to be a readable frame (i.e., including
               FCS octets but excluding framing bits and dribble
               bits).

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               This statistic provides an indicator of the total
               data transferred.  The approximate minimum time
               for rollover of this counter in a 10Mb/s repeater
               is 58 minutes.

               For ports receiving traffic at a maximum rate in
               a 100Mb/s repeater, this counter can roll over
               in less than 6 minutes.  Since that amount of time
               could be less than a management station's poll cycle
               time, in order to avoid a loss of information a
               management station is advised to also poll the
               rptrMonitorPortUpper32Octets object, or to use the
               64-bit counter defined by
               rptrMonitorPortHCReadableOctets instead of the
               two 32-bit counters."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.5, aReadableOctets."
       ::= { rptrMonitorPortEntry 4 }

   rptrMonitorPortFCSErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each frame
               received on this port with the FCSError signal
               asserted and the FramingError and CollisionEvent
               signals deasserted and whose OctetCount is greater



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               than or equal to minFrameSize and less than or
               equal to maxFrameSize (Ref: 4.4.2.1, IEEE 802.3
               Std).

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 80 hours at 10Mb/s."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.6,
               aFrameCheckSequenceErrors."
       ::= { rptrMonitorPortEntry 5 }

   rptrMonitorPortAlignmentErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each frame
               received on this port with the FCSError and
               FramingError signals asserted and CollisionEvent
               signal deasserted and whose OctetCount is greater
               than or equal to minFrameSize and less than or
               equal to maxFrameSize (Ref: IEEE 802.3 Std,
               4.4.2.1).  If rptrMonitorPortAlignmentErrors is
               incremented then the rptrMonitorPortFCSErrors
               Counter shall not be incremented for the same
               frame.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 80 hours at 10Mb/s."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.7, aAlignmentErrors."
       ::= { rptrMonitorPortEntry 6 }

   rptrMonitorPortFrameTooLongs OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each frame
               received on this port whose OctetCount is greater



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               than maxFrameSize (Ref: 4.4.2.1, IEEE 802.3 Std).
               If rptrMonitorPortFrameTooLongs is incremented
               then neither the rptrMonitorPortAlignmentErrors
               nor the rptrMonitorPortFCSErrors counter shall be
               incremented for the frame.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 61 days in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.8, aFramesTooLong."
       ::= { rptrMonitorPortEntry 7 }

   rptrMonitorPortShortEvents OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each
               CarrierEvent on this port with ActivityDuration
               less than ShortEventMaxTime.  ShortEventMaxTime is
               greater than 74 bit times and less than 82 bit
               times.  ShortEventMaxTime has tolerances included
               to provide for circuit losses between a
               conformance test point at the AUI and the
               measurement point within the state machine.

               Notes:

               ShortEvents may indicate externally
               generated noise hits which will cause the repeater
               to transmit Runts to its other ports, or propagate
               a collision (which may be late) back to the
               transmitting DTE and damaged frames to the rest of
               the network.

               Implementors may wish to consider selecting the
               ShortEventMaxTime towards the lower end of the
               allowed tolerance range to accommodate bit losses
               suffered through physical channel devices not
               budgeted for within this standard.

               The significance of this attribute is different
               in 10 and 100 Mb/s collision domains.  Clause 9
               repeaters perform fragment extension of short



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               events which would be counted as runts on the
               interconnect ports of other repeaters.  Clause
               27 repeaters do not perform fragment extension.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 16 hours in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.9, aShortEvents."
       ::= { rptrMonitorPortEntry 8 }

   rptrMonitorPortRunts OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each
               CarrierEvent on this port that meets one of the
               following two conditions.  Only one test need be
               made.  a) The ActivityDuration is greater than
               ShortEventMaxTime and less than ValidPacketMinTime
               and the CollisionEvent signal is deasserted.  b)
               The OctetCount is less than 64, the
               ActivityDuration is greater than ShortEventMaxTime
               and the CollisionEvent signal is deasserted.
               ValidPacketMinTime is greater than or equal to 552
               bit times and less than 565 bit times.

               An event whose length is greater than 74 bit times
               but less than 82 bit times shall increment either
               the shortEvents counter or the runts counter but
               not both.  A CarrierEvent greater than or equal to
               552 bit times but less than 565 bit times may or
               may not be counted as a runt.

               ValidPacketMinTime has tolerances included to
               provide for circuit losses between a conformance
               test point at the AUI and the measurement point
               within the state machine.

               Runts usually indicate collision fragments, a
               normal network event.  In certain situations
               associated with large diameter networks a
               percentage of collision fragments may exceed
               ValidPacketMinTime.



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               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 16 hours in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.10, aRunts."
       ::= { rptrMonitorPortEntry 9 }

   rptrMonitorPortCollisions OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "For a clause 9 repeater, this counter is
               incremented by one for any CarrierEvent signal
               on any port for which the CollisionEvent signal
               on this port is asserted.  For a clause 27
               repeater port the counter increments on entering
               the Collision Count Increment state of the
               partition state diagram (fig 27-8 of
               [IEEE 802.3 Std]).

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 16 hours in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.11, aCollisions."
       ::= { rptrMonitorPortEntry 10 }

   rptrMonitorPortLateEvents OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "For a clause 9 repeater port, this counter is
               incremented by one for each CarrierEvent
               on this port in which the CollIn(X)
               variable transitions to the value SQE (Ref:
               9.6.6.2, IEEE 802.3 Std) while the
               ActivityDuration is greater than the
               LateEventThreshold.  For a clause 27 repeater
               port, this counter is incremented by one on
               entering the Collision Count Increment state



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               of the  partition state diagram (fig 27-8)
               while the  ActivityDuration is greater than
               the LateEvent- Threshold.  Such a CarrierEvent
               is counted twice, as both a collision and as a
               lateEvent.

               The LateEventThreshold is greater than 480 bit
               times and less than 565 bit times.
               LateEventThreshold has tolerances included to
               permit an implementation to build a single
               threshold to serve as both the LateEventThreshold
               and ValidPacketMinTime threshold.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 81 hours in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.12, aLateEvents."
       ::= { rptrMonitorPortEntry 11 }

   rptrMonitorPortVeryLongEvents OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "For a clause 9 repeater port, this counter
               is incremented by one for each CarrierEvent
               whose ActivityDuration is greater than the
               MAU Jabber Lockup Protection timer TW3
               (Ref: 9.6.1 & 9.6.5, IEEE 802.3 Std).

               For a clause 27 repeater port, this counter
               is incremented by one on entry to the
               Rx Jabber state of the receiver timer state
               diagram (fig 27-7).  Other counters may
               be incremented as appropriate.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.13, aVeryLongEvents."
       ::= { rptrMonitorPortEntry 12 }

   rptrMonitorPortDataRateMismatches OBJECT-TYPE



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       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each
               frame received by this port that meets all
               of the conditions required by only one of the
               following two measurement methods:

               Measurement method A:  1) The CollisionEvent
               signal is not asserted (10Mb/s operation) or
               the Collision Count Increment state of the
               partition state diagram (fig 27-8 of
               [IEEE 802.3 Std]) has not been entered
               (100Mb/s operation).  2) The ActivityDuration
               is greater than ValidPacketMinTime.  3) The
               frequency (data rate) is detectably mismatched
               from the local transmit frequency.

               Measurement method B:  1) The CollisionEvent
               signal is not asserted (10Mb/s operation)
               or the Collision Count Increment state of the
               partition state diagram (fig 27-8 of
               [IEEE 802.3 Std]) has not been entered
               (100Mb/s operation).  2) The OctetCount is
               greater than 63.  3) The frequency (data
               rate) is detectably mismatched from the local
               transmit frequency.  The exact degree of
               mismatch is vendor specific and is to be
               defined by the vendor for conformance testing.

               When this event occurs, other counters whose
               increment conditions were satisfied may or may not
               also be incremented, at the implementor's
               discretion.  Whether or not the repeater was able
               to maintain data integrity is beyond the scope of
               this standard.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.14, aDataRateMismatches."
       ::= { rptrMonitorPortEntry 13 }

   rptrMonitorPortAutoPartitions OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only



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       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for
               each time the repeater has automatically
               partitioned this port.

               The conditions that cause a clause 9
               repeater port to partition are specified in
               the partition state diagram in clause 9 of
               [IEEE 802.3 Std].  They are not differentiated
               here.  A clause 27 repeater port partitions
               on entry to the Partition Wait state of the
               partition state diagram (fig 27-8 in
               [IEEE 802.3 Std]).

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.15, aAutoPartitions."
       ::= { rptrMonitorPortEntry 14 }

   rptrMonitorPortTotalErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The total number of errors which have occurred on
               this port.  This counter is the summation of the
               values of other error counters (for the same
               port), namely:

                   rptrMonitorPortFCSErrors,
                   rptrMonitorPortAlignmentErrors,
                   rptrMonitorPortFrameTooLongs,
                   rptrMonitorPortShortEvents,
                   rptrMonitorPortLateEvents,
                   rptrMonitorPortVeryLongEvents,
                   rptrMonitorPortDataRateMismatches, and
                   rptrMonitorPortSymbolErrors.

               This counter is redundant in the sense that it is
               the summation of information already available
               through other objects.  However, it is included
               specifically because the regular retrieval of this
               object as a means of tracking the health of a port
               provides a considerable optimization of network
               management traffic over the otherwise necessary



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               retrieval of the summed counters.

               Note that rptrMonitorPortRunts is not included
               in this total; this is because runts usually
               indicate collision fragments, a normal network
               event.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       ::= { rptrMonitorPortEntry 15 }

   rptrMonitorPortLastChange OBJECT-TYPE
       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The value of sysUpTime when the last of
               the following occurred:
                 1) the agent cold- or warm-started;
                 2) the row for the port was created
                    (such as when a device or module was added
                     to the system); or
                 3) any condition that would cause one of
                    the counters for the row to experience
                    a discontinuity."
       ::= { rptrMonitorPortEntry 16 }

   rptrMonitor100PortTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrMonitor100PortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "Table of additional performance and error
               statistics for 100Mb/s ports, above and
               beyond those parameters that apply to both
               10 and 100Mbps ports.  Entries exist only for
               ports attached to 100Mbps repeaters.

               The columnar object rptrMonitorPortLastChange
               is used to indicate possible discontinuities
               of counter type columnar objects in this table."
       ::= { rptrMonitorPortInfo 2 }

   rptrMonitor100PortEntry OBJECT-TYPE
       SYNTAX      RptrMonitor100PortEntry
       MAX-ACCESS  not-accessible
       STATUS      current



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       DESCRIPTION
               "An entry in the table, containing performance
               and error statistics for a single 100Mb/s port."
       INDEX    { rptrMonitorPortGroupIndex, rptrMonitorPortIndex }
       ::= { rptrMonitor100PortTable 1 }

   RptrMonitor100PortEntry ::=
       SEQUENCE {
           rptrMonitorPortIsolates
               Counter32,
           rptrMonitorPortSymbolErrors
               Counter32,
           rptrMonitorPortUpper32Octets
               Counter32,
           rptrMonitorPortHCReadableOctets
               Counter64
       }

   rptrMonitorPortIsolates OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one each time that
               the repeater port automatically isolates as a
               consequence of false carrier events.  The conditions
               which cause a port to automatically isolate are
               defined by the transition from the False Carrier
               state to the Link Unstable state of the carrier
               integrity state diagram (figure 27-9)
               [IEEE 802.3 Standard].

               Note:  Isolates do not affect the value of
               the PortOperStatus object.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.16, aIsolates."
       ::= { rptrMonitor100PortEntry 1 }

   rptrMonitorPortSymbolErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one each time when



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               valid length packet was received at the port and
               there was at least one occurrence of an invalid
               data symbol. This can increment only once per valid
               carrier event. A collision presence at any port of
               the repeater containing port N, will not cause this
               attribute to increment.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 7.4 hours at 100Mb/s."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.17,
               aSymbolErrorDuringPacket."
       ::= { rptrMonitor100PortEntry 2 }

   rptrMonitorPortUpper32Octets OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object is the number of octets contained in
               valid frames that have been received on this port,
               modulo 2**32.  That is, it contains the upper 32
               bits of a 64-bit octets counter, of which the
               lower 32 bits are contained in the
               rptrMonitorPortReadableOctets object.

               This two-counter mechanism is provided for those
               network management protocols that do not support
               64-bit counters (e.g. SNMP V1) and are used to
               manage a repeater type of 100Mb/s.

               Conformance clauses for this MIB are defined such
               that implementation of this object is not required
               in a system which does not support 100Mb/s.
               However, systems with mixed 10 and 100Mb/s ports
               may implement this object across all ports,
               including 10Mb/s.  If this object is implemented,
               it must be according to the definition in the first
               paragraph of this description; that is, the value
               of this object MUST be a valid count.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."



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       ::= { rptrMonitor100PortEntry 3 }

   rptrMonitorPortHCReadableOctets OBJECT-TYPE
       SYNTAX      Counter64
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object is the number of octets contained in
               valid frames that have been received on this port.
               This counter is incremented by OctetCount for each
               frame received on this port which has been
               determined to be a readable frame (i.e., including
               FCS octets but excluding framing bits and dribble
               bits).

               This statistic provides an indicator of the total
               data transferred.

               This counter is a 64-bit version of rptrMonitor-
               PortReadableOctets. It should be used by network
               management protocols which suppport 64-bit counters
               (e.g. SNMPv2).

               Conformance clauses for this MIB are defined such
               that implementation of this object is not required
               in a system which does not support 100Mb/s.
               However, systems with mixed 10 and 100Mb/s ports
               may implement this object across all ports,
               including 10Mb/s.  If this object is implemented,
               it must be according to the definition in the first
               paragraph of this description; that is, the value
               of this object MUST be a valid count.

               A discontinuity may occur in the value
               when the value of object
               rptrMonitorPortLastChange changes."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.5, aReadableOctets."
       ::= { rptrMonitor100PortEntry 4 }


   -- New version of statistics at the repeater level.
   --
   -- Statistics objects for each managed repeater
   -- in the system.

   rptrMonTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrMonEntry



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       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A table of information about each
               non-trivial repeater.  The number of entries
               in this table is the same as the number of
               entries in the rptrInfoTable.

               The columnar object rptrInfoLastChange is
               used to indicate possible discontinuities of
               counter type columnar objects in this table."
       ::= { rptrMonitorAllRptrInfo 1 }

   rptrMonEntry OBJECT-TYPE
       SYNTAX      RptrMonEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "An entry in the table, containing information
               about a single non-trivial repeater."
       INDEX    { rptrInfoId }
       ::= { rptrMonTable 1 }

   RptrMonEntry ::=
       SEQUENCE {
           rptrMonTxCollisions
               Counter32,
           rptrMonTotalFrames
               Counter32,
           rptrMonTotalErrors
               Counter32,
           rptrMonTotalOctets
               Counter32
       }

   rptrMonTxCollisions OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "For a clause 9 (10Mb/s) repeater, this counter
               is incremented every time the repeater state
               machine enters the TRANSMIT COLLISION state
               from any state other than ONE PORT LEFT
               (Ref: Fig 9-2 [IEEE 802.3 Std]).

               For a clause 27 repeater, this counter is
               incremented every time the repeater core state



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               diagram enters the Jam state as a result of
               Activity(ALL) > 1 (fig 27-2 [IEEE 802.3 Std]).

               The approximate minimum time for rollover of this
               counter is 16 hours in a 10Mb/s repeater and 1.6
               hours in a 100Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.1.8, aTransmitCollisions"
       ::= { rptrMonEntry 1 }

   rptrMonTotalFrames OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The number of frames of valid frame length
               that have been received on the ports in this repeater
               and for which the FCSError and CollisionEvent
               signals were not asserted.  If an implementation
               can not obtain a count of frames as seen by
               the repeater itself, this counter may be
               implemented as the summation of the values of the
               rptrMonitorPortReadableFrames counters for all of
               the ports in the repeater.

               This statistic provides one of the parameters
               necessary for obtaining the packet error rate.
               The approximate minimum time for rollover of this
               counter is 80 hours in a 10Mb/s repeater."
       ::= { rptrMonEntry 3 }

   rptrMonTotalErrors OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The total number of errors which have occurred on
               all of the ports in this repeater.  The errors
               included in this count are the same as those listed
               for the rptrMonitorPortTotalErrors counter.  If an
               implementation can not obtain a count of these
               errors as seen by the repeater itself, this counter
               may be implemented as the summation of the values of
               the rptrMonitorPortTotalErrors counters for all of
               the ports in the repeater."
       ::= { rptrMonEntry 4 }

   rptrMonTotalOctets OBJECT-TYPE



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       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The total number of octets contained in the valid
               frames that have been received on the ports in
               this group.  If an implementation can not obtain
               a count of octets as seen by the repeater itself,
               this counter may be the summation of the
               values of the rptrMonitorPortReadableOctets
               counters for all of the ports in the group.

               This statistic provides an indicator of the total
               data transferred.  The approximate minimum time
               for rollover of this counter in a 10Mb/s repeater
               is 58 minutes divided by the number of ports in
               the repeater.

               For 100Mb/s repeaters processing traffic at a
               maximum rate, this counter can roll over in less
               than 6 minutes divided by the number of ports in
               the repeater.  Since that amount of time could
               be less than a management station's poll cycle
               time, in order to avoid a loss of information a
               management station is advised to also poll the
               rptrMonUpper32TotalOctets object, or to use the
               64-bit counter defined by rptrMonHCTotalOctets
               instead of the two 32-bit counters."
       ::= { rptrMonEntry 5 }

   rptrMon100Table OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrMon100Entry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A table of additional information about each
               100Mb/s repeater, augmenting the entries in
               the rptrMonTable.  Entries exist in this table
               only for 100Mb/s repeaters.

               The columnar object rptrInfoLastChange is
               used to indicate possible discontinuities of
               counter type columnar objects in this table."
       ::= { rptrMonitorAllRptrInfo 2 }

   rptrMon100Entry OBJECT-TYPE
       SYNTAX      RptrMon100Entry
       MAX-ACCESS  not-accessible



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       STATUS      current
       DESCRIPTION
               "An entry in the table, containing information
               about a single 100Mbps repeater."
       INDEX    { rptrInfoId }
       ::= { rptrMon100Table 1 }

   RptrMon100Entry ::=
       SEQUENCE {
           rptrMonUpper32TotalOctets
               Counter32,
           rptrMonHCTotalOctets
               Counter64
       }

   rptrMonUpper32TotalOctets OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The total number of octets contained in the valid
               frames that have been received on the ports in
               this repeater, modulo 2**32.  That is, it contains
               the upper 32 bits of a 64-bit counter, of which
               the lower 32 bits are contained in the
               rptrMonTotalOctets object.  If an implementation
               can not obtain a count of octets as seen
               by the repeater itself, the 64-bit value
               may be the summation of the values of the
               rptrMonitorPortReadableOctets counters combined
               with the corresponding rptrMonitorPortUpper32Octets
               counters for all of the ports in the repeater.

               This statistic provides an indicator of the total
               data transferred within the repeater.

               This two-counter mechanism is provided for those
               network management protocols that do not support
               64-bit counters (e.g. SNMP V1) and are used to
               manage a repeater type of 100Mb/s.

               Conformance clauses for this MIB are defined such
               that implementation of this object is not required
               in a system which does not support 100Mb/s.
               However, systems with mixed 10 and 100Mb/s ports
               may implement this object across all ports,
               including 10Mb/s.  If this object is implemented,
               it must be according to the definition in the first



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               paragraph of this description; that is, the value
               of this object MUST be a valid count."
       ::= { rptrMon100Entry 1 }

   rptrMonHCTotalOctets OBJECT-TYPE
       SYNTAX      Counter64
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The total number of octets contained in the valid
               frames that have been received on the ports in
               this group.  If a implementation can not obtain
               a count of octets as seen by the repeater itself,
               this counter may be the summation of the
               values of the rptrMonitorPortReadableOctets
               counters for all of the ports in the group.

               This statistic provides an indicator of the total
               data transferred.

               This counter is a 64-bit (high-capacity) version
               of rptrMonUpper32TotalOctets and rptrMonTotalOctets.
               It should be used by network management protocols
               which support 64-bit counters (e.g. SNMPv2).

               Conformance clauses for this MIB are defined such
               that implementation of this object is not required
               in a system which does not support 100Mb/s.
               However, systems with mixed 10 and 100Mb/s ports
               may implement this object across all ports,
               including 10Mb/s.  If this object is implemented,
               it must be according to the definition in the first
               paragraph of this description; that is, the value
               of this object MUST be a valid count."
       ::= { rptrMon100Entry 2 }


   --
   -- The Repeater Address Search Table
   --
   -- This table provides an active address tracking
   -- capability which can be also used to collect the
   -- necessary information for mapping the topology
   -- of a network.  Note that an NMS is required to have
   -- read-write access to the table in order to access
   -- this function.  Section 4, "Topology Mapping",
   -- contains a description of an algorithm which can
   -- make use of this table, in combination with the



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   -- forwarding databases of managed bridges/switches
   -- in the network, to map network topology.
   --

   rptrAddrSearchTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF RptrAddrSearchEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
               "This table contains one entry per repeater in the
               system.  It defines objects which allow a network
               management application to instruct an agent to watch
               for a given MAC address and report which port it
               was seen on.  Only one address search can be in
               progress on each repeater at any one time.  Before
               starting an address search, a management application
               should obtain 'ownership' of the entry in
               rptrAddrSearchTable for the repeater that is to
               perform the search.  This is accomplished with the
               rptrAddrSearchLock and rptrAddrSearchStatus as
               follows:

               try_again:
                   get(rptrAddrSearchLock, rptrAddrSearchStatus)
                   while (rptrAddrSearchStatus != notInUse)
                   {
                       /* Loop waiting for objects to be available*/
                       short delay
                       get(rptrAddrSearchLock, rptrAddrSearchStatus)
                   }

                   /* Try to claim map objects */
                   lock_value = rptrAddrSearchLock
                   if ( set(rptrAddrSearchLock = lock_value,
                            rptrAddrSearchStatus = inUse,
                            rptrAddrSearchOwner = 'my-IP-address)
                         == FAILURE)
                       /* Another manager got the lock */
                       goto try_again

                   /* I have the lock */
                   set (rptrAddrSearchAddress = <search target>)

                   wait for rptrAddrSearchState to change from none

                   if (rptrAddrSearchState == single)
                       get (rptrAddrSearchGroup, rptrAddrSearchPort)




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                   /* release the lock, making sure not to overwrite
                      anyone else's lock */
                   set (rptrAddrSearchLock = lock_value+1,
                        rptrAddrSearchStatus = notInUse,
                        rptrAddrSearchOwner = '')

               A management station first retrieves the values of
               the appropriate instances of the rptrAddrSearchLock
               and rptrAddrSearchStatus objects, periodically
               repeating the retrieval if necessary, until the value
               of rptrAddrSearchStatus is 'notInUse'.  The
               management station then tries to set the same
               instance of the rptrAddrSearchLock object to the
               value it just retrieved, the same instance of the
               rptrAddrSearchStatus object to 'inUse', and the
               corresponding instance of rptrAddrSearchOwner to a
               value indicating itself.  If the set operation
               succeeds, then the management station has obtained
               ownership of the rptrAddrSearchEntry, and the value
               of rptrAddrSearchLock is incremented by the agent (as
               per the semantics of TestAndIncr).  Failure of the
               set operation indicates that some other manager has
               obtained ownership of the rptrAddrSearchEntry.

               Once ownership is obtained, the management station
               can proceed with the search operation.  Note that the
               agent will reset rptrAddrSearchStatus to 'notInUse'
               if it has been in the 'inUse' state for an abnormally
               long period of time, to prevent a misbehaving manager
               from permanently locking the entry.  It is suggested
               that this timeout period be between one and five
               minutes.

               When the management station has completed its search
               operation, it should free the entry by setting
               the instance of the rptrAddrSearchLock object to the
               previous value + 1, the instance of the
               rptrAddrSearchStatus to 'notInUse', and the instance
               of rptrAddrSearchOwner to a zero length string.  This
               is done to prevent overwriting another station's
               lock."
       ::= { rptrAddrTrackRptrInfo 1 }

   rptrAddrSearchEntry OBJECT-TYPE
       SYNTAX     RptrAddrSearchEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION



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               "An entry containing objects for invoking an address
               search on a repeater."
       INDEX      { rptrInfoId }
       ::= { rptrAddrSearchTable 1 }

   RptrAddrSearchEntry ::=
       SEQUENCE {
           rptrAddrSearchLock     TestAndIncr,
           rptrAddrSearchStatus   INTEGER,
           rptrAddrSearchAddress  MacAddress,
           rptrAddrSearchState    INTEGER,
           rptrAddrSearchGroup    Integer32,
           rptrAddrSearchPort     Integer32,
           rptrAddrSearchOwner    OwnerString
       }


   rptrAddrSearchLock OBJECT-TYPE
       SYNTAX     TestAndIncr
       MAX-ACCESS read-write
       STATUS     current
       DESCRIPTION
               "This object is used by a management station as an
               advisory lock for this rptrAddrSearchEntry."
       ::= { rptrAddrSearchEntry 1 }

   rptrAddrSearchStatus  OBJECT-TYPE
       SYNTAX     INTEGER {
                      notInUse(1),
                      inUse(2)
                  }
       MAX-ACCESS read-write
       STATUS     current
       DESCRIPTION
               "This object is used to indicate that some management
               station is currently using this rptrAddrSearchEntry.
               Cooperating managers should set this object to
               'notInUse' when they are finished using this entry.
               The agent will automatically set the value of this
               object to 'notInUse' if it has been set to 'inUse'
               for an unusually long period of time."
       ::= { rptrAddrSearchEntry 2 }

   rptrAddrSearchAddress OBJECT-TYPE
       SYNTAX     MacAddress
       MAX-ACCESS read-write
       STATUS     current
       DESCRIPTION



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               "This object is used to search for a specified MAC
               address.  When this object is set, an address search
               begins.  This automatically sets the corresponding
               instance of the rptrAddrSearchState object  to 'none'
               and the corresponding instances of the
               rptrAddrSearchGroup and rptrAddrSearchPort objects to
               0.

               When a valid frame is received by this repeater with
               a source MAC address which matches the current value
               of rptrAddrSearchAddress, the agent will update the
               corresponding instances of rptrAddrSearchState,
               rptrAddrSearchGroup and rptrAddrSearchPort to reflect
               the current status of the search, and the group and
               port on which the frame was seen."
       ::= { rptrAddrSearchEntry 3 }

   rptrAddrSearchState OBJECT-TYPE
       SYNTAX     INTEGER {
                       none(1),
                       single(2),
                       multiple(3)
                  }
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The current state of the MAC address search on this
               repeater.  This object is initialized to 'none' when
               the corresponding instance of rptrAddrSearchAddress
               is set.  If the agent detects the address on exactly
               one port, it will set this object to 'single', and
               set the corresponding instances of
               rptrAddrSearchGroup and rptrAddrSearchPort to reflect
               the group and port on which the address was heard.
               If the agent detects the address on more than one
               port, it will set this object to 'multiple'."
       ::= { rptrAddrSearchEntry 4 }

   rptrAddrSearchGroup OBJECT-TYPE
       SYNTAX     Integer32 (0..2147483647)
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The group from which an error-free frame whose
               source address is equal to the corresponding instance
               of rptrAddrSearchAddress has been received.  The
               value of this object is undefined when the
               corresponding instance of rptrAddrSearchState is



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               equal to 'none' or 'multiple'."
       ::= { rptrAddrSearchEntry 5 }

   rptrAddrSearchPort OBJECT-TYPE
       SYNTAX     Integer32 (0..2147483647)
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
               "The port rom which an error-free frame whose
               source address is equal to the corresponding instance
               of rptrAddrSearchAddress has been received.  The
               value of this object is undefined when the
               corresponding instance of rptrAddrSearchState is
               equal to 'none' or 'multiple'."
       ::= { rptrAddrSearchEntry 6 }

   rptrAddrSearchOwner OBJECT-TYPE
       SYNTAX     OwnerString
       MAX-ACCESS read-write
       STATUS     current
       DESCRIPTION
               "The entity which currently has 'ownership' of this
               rptrAddrSearchEntry."
       ::= { rptrAddrSearchEntry 7 }


   --
   -- The Port Address Tracking Table
   --
   -- This table provides a way for a network management
   -- application to passively gather information (using
   -- read-only privileges) about which network addresses
   -- are connected to which ports of a repeater.
   --

   rptrAddrTrackTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrAddrTrackEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "Table of address mapping information about the
               ports."
       ::= { rptrAddrTrackPortInfo 1 }

   rptrAddrTrackEntry OBJECT-TYPE
       SYNTAX      RptrAddrTrackEntry
       MAX-ACCESS  not-accessible
       STATUS      current



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       DESCRIPTION
               "An entry in the table, containing address mapping
               information about a single port."
       INDEX    { rptrAddrTrackGroupIndex, rptrAddrTrackPortIndex }
       ::= { rptrAddrTrackTable 1 }

   RptrAddrTrackEntry ::=
       SEQUENCE {
           rptrAddrTrackGroupIndex
               INTEGER,
           rptrAddrTrackPortIndex
               INTEGER,
           rptrAddrTrackLastSourceAddress     -- DEPRECATED OBJECT
               MacAddress,
           rptrAddrTrackSourceAddrChanges
               Counter32,
           rptrAddrTrackNewLastSrcAddress
               OptMacAddr,
           rptrAddrTrackCapacity
               Integer32
       }

   rptrAddrTrackGroupIndex OBJECT-TYPE
       SYNTAX      INTEGER (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrAddrTrackEntry 1 }

   rptrAddrTrackPortIndex OBJECT-TYPE
       SYNTAX      INTEGER (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.1, aPortID."
       ::= { rptrAddrTrackEntry 2 }

   rptrAddrTrackLastSourceAddress OBJECT-TYPE
       SYNTAX      MacAddress
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********



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               This object is the SourceAddress of the last
               readable frame (i.e., counted by
               rptrMonitorPortReadableFrames) received by this
               port.

               This object has been deprecated because its value
               is undefined when no frames have been observed on
               this port.  The replacement object is
               rptrAddrTrackNewLastSrcAddress."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.18, aLastSourceAddress."
       ::= { rptrAddrTrackEntry 3 }

   rptrAddrTrackSourceAddrChanges OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This counter is incremented by one for each time
               that the rptrAddrTrackLastSourceAddress attribute
               for this port has changed.

               This may indicate whether a link is connected to a
               single DTE or another multi-user segment.

               A discontinuity may occur in the value when the
               value of object rptrMonitorPortLastChange changes.

               The approximate minimum time for rollover of this
               counter is 81 hours in a 10Mb/s repeater."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.19, aSourceAddressChanges."
       ::= { rptrAddrTrackEntry 4 }

   rptrAddrTrackNewLastSrcAddress OBJECT-TYPE
       SYNTAX      OptMacAddr
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object is the SourceAddress of the last
               readable frame (i.e., counted by
               rptrMonitorPortReadableFrames) received by this
               port.  If no frames have been received by this
               port since the agent began monitoring the port
               activity, the agent shall return a string of
               length zero."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.18, aLastSourceAddress."



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       ::= { rptrAddrTrackEntry 5 }

   rptrAddrTrackCapacity OBJECT-TYPE
       SYNTAX      Integer32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The maximum number of addresses that can be
               detected on this port. This value indicates
               to the maximum  number of entries in the
               rptrExtAddrTrackTable relative to this port.

               If this object has the value of 1, the agent
               implements only the LastSourceAddress mechanism
               described by RFC 1368 or RFC 1516."
       ::= { rptrAddrTrackEntry 6 }


   -- Table for multiple addresses per port

   rptrExtAddrTrackTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrExtAddrTrackEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A table to extend the address tracking table (i.e.,
               rptrAddrTrackTable) with a list of source MAC
               addresses that were recently received on each port.
               The number of ports is the same as the number
               of entries in table rptrPortTable. The number of
               entries in this table depends on the agent/repeater
               implementation and the number of different
               addresses received on each port.

               The first entry for each port contains
               the same MAC address that is given by the
               rptrAddrTrackNewLastSrcAddress for that port.

               Entries in this table for a particular port are
               retained when that port is switched from one
               repeater to another.

               The ordering of MAC addresses listed for a
               particular port is implementation dependent."
       ::= { rptrAddrTrackPortInfo 2 }

   rptrExtAddrTrackEntry OBJECT-TYPE
       SYNTAX      RptrExtAddrTrackEntry



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       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A row in the table of extended address tracking
               information for ports. Entries can not be directly
               created or deleted via SNMP operations."
       INDEX       { rptrAddrTrackGroupIndex,
                     rptrAddrTrackPortIndex,
                     rptrExtAddrTrackMacIndex }
       ::= { rptrExtAddrTrackTable 1 }

   RptrExtAddrTrackEntry ::= SEQUENCE {
       rptrExtAddrTrackMacIndex Integer32,
       rptrExtAddrTrackSourceAddress MacAddress
       }

   rptrExtAddrTrackMacIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The index of a source MAC address seen on
               the port.

               The ordering of MAC addresses listed for a
               particular port is implementation dependent.

               There is no implied relationship between a
               particular index and a particular MAC
               address.  The index for a particular MAC
               address may change without notice."
       ::= { rptrExtAddrTrackEntry 1 }

   rptrExtAddrTrackSourceAddress OBJECT-TYPE
       SYNTAX      MacAddress
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The source MAC address from a readable frame
               (i.e., counted by rptrMonitorPortReadableFrames)
               recently received by the port."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.3.1.18, aLastSourceAddress."
       ::= { rptrExtAddrTrackEntry 2 }


   -- The Repeater Top "N" Port Group




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   -- The Repeater Top N Port group is used to prepare reports that
   -- describe a list of ports ordered by one of the statistics in the
   -- Repeater Monitor Port Table.  The statistic chosen by the
   -- management station is sampled over a management
   -- station-specified time interval, making the report rate based.
   -- The management station also specifies the number of ports that
   -- are reported.
   --
   -- The rptrTopNPortControlTable is used to initiate the generation
   -- of a report.  The management station may select the parameters
   -- of such a report, such as which repeater, which statistic, how
   -- many ports, and the start & stop times of the sampling.  When
   -- the report is prepared, entries are created in the
   -- rptrTopNPortTable associated with the relevent
   -- rptrTopNControlEntry.  These entries are static for
   -- each report after it has been prepared.

   -- Note that counter discontinuities may appear in some
   -- implementations if ports' assignment to repeaters changes
   -- during the collection of data for a Top "N" report.
   -- A management application could read the corresponding
   -- rptrMonitorPortLastChange timestamp in order to check
   -- whether a discontinuity occurred.


   rptrTopNPortControlTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrTopNPortControlEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A table of control records for reports on the top `N'
           ports for the rate of a selected counter. The number
           of entries depends on the configuration of the agent.
           The maximum number of entries is implementation
           dependent."
       ::= { rptrTopNPortInfo 1 }

   rptrTopNPortControlEntry OBJECT-TYPE
       SYNTAX      RptrTopNPortControlEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A set of parameters that control the creation of a
               report of the top N ports according to several metrics."
       INDEX    { rptrTopNPortControlIndex }
       ::= { rptrTopNPortControlTable 1 }

   RptrTopNPortControlEntry ::= SEQUENCE {



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       rptrTopNPortControlIndex
           Integer32,
       rptrTopNPortRepeaterId
           Integer32,
       rptrTopNPortRateBase
           INTEGER,
       rptrTopNPortTimeRemaining
           Integer32,
       rptrTopNPortDuration
           Integer32,
       rptrTopNPortRequestedSize
           Integer32,
       rptrTopNPortGrantedSize
           Integer32,
       rptrTopNPortStartTime
           TimeStamp,
       rptrTopNPortOwner
           OwnerString,
       rptrTopNPortRowStatus
           RowStatus
   }

   rptrTopNPortControlIndex OBJECT-TYPE
       SYNTAX      Integer32 (1 .. 65535)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "An index that uniquely identifies an entry in the
               rptrTopNPortControl table.  Each such entry defines
               one top N report prepared for a repeater or system."
       ::= { rptrTopNPortControlEntry 1 }

   rptrTopNPortRepeaterId OBJECT-TYPE
       SYNTAX      Integer32 (0..2147483647)
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
               "Identifies the repeater for which a top N report will
               be prepared (see rptrInfoId).  If the value of this
               object is positive, only ports assigned to this repeater
               will be used to form the list in which to order the
               Top N table.  If this value is zero, all ports will be
               eligible for inclusion on the list.

               The value of this object may not be modified if the
               associated rptrTopNPortRowStatus object is equal to
               active(1).




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               If, for a particular row in this table, the repeater
               specified by the value of this object goes away (is
               removed from the rptrInfoTable) while the associated
               rptrTopNPortRowStatus object is equal to active(1),
               the row in this table is preserved by the agent but
               the value of rptrTopNPortRowStatus is changed to
               notInService(2), and the agent may time out the row
               if appropriate.  If the specified repeater comes
               back (reappears in the rptrInfoTable) before the row
               has been timed out, the management station must set
               the value of the rptrTopNPortRowStatus object back
               to active(1) if desired (the agent doesn't do this
               automatically)."
       ::= { rptrTopNPortControlEntry 2 }

   rptrTopNPortRateBase OBJECT-TYPE
       SYNTAX      INTEGER  {
                     readableFrames(1),
                     readableOctets(2),
                     fcsErrors(3),
                     alignmentErrors(4),
                     frameTooLongs(5),
                     shortEvents(6),
                     runts(7),
                     collisions(8),
                     lateEvents(9),
                     veryLongEvents(10),
                     dataRateMismatches(11),
                     autoPartitions(12),
                     totalErrors(13),
                     isolates(14),
                     symbolErrors(15)
                   }
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
               "The monitored variable, which the rptrTopNPortRate
               variable is based upon.

               The value of this object may not be modified if
               the associated rptrTopNPortRowStatus object has
               a value of active(1)."
       ::= { rptrTopNPortControlEntry 3 }

   rptrTopNPortTimeRemaining OBJECT-TYPE
       SYNTAX      Integer32 (0..2147483647)
       MAX-ACCESS  read-create
       STATUS      current



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       DESCRIPTION
               "The number of seconds left in the report
               currently being collected.  When this object
               is modified by the management station, a new
               collection is started, possibly aborting a
               currently running report.  The new value is
               used as the requested duration of this report,
               which is loaded into the associated
               rptrTopNPortDuration object.

               When this object is set to a non-zero value,
               any associated rptrTopNPortEntries shall be
               made inaccessible by the agent.  While the value
               of this object is non-zero, it decrements by one
               per second until it reaches zero.  During this
               time, all associated rptrTopNPortEntries shall
               remain inaccessible.  At the time that this object
               decrements to zero, the report is made accessible
               in the rptrTopNPortTable.  Thus, the rptrTopNPort
               table needs to be created only at the end of the
               collection interval.

               If the value of this object is set to zero
               while the associated report is running, the
               running report is aborted and no associated
               rptrTopNPortEntries are created."
       DEFVAL { 0 }
       ::= { rptrTopNPortControlEntry 4 }

   rptrTopNPortDuration OBJECT-TYPE
       SYNTAX      Integer32 (0..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The number of seconds that this report has
               collected during the last sampling interval,
               or if this report is currently being collected,
               the number of seconds that this report is being
               collected during this sampling interval.

               When the associated rptrTopNPortTimeRemaining
               object is set, this object shall be set by the
               agent to the same value and shall not be modified
               until the next time the rptrTopNPortTimeRemaining
               is set.

               This value shall be zero if no reports have been
               requested for this rptrTopNPortControlEntry."



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        ::= { rptrTopNPortControlEntry 5 }

   rptrTopNPortRequestedSize OBJECT-TYPE
       SYNTAX      Integer32
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
               "The maximum number of repeater ports requested
               for the Top N Table.

               When this object is created or modified, the
               agent should set rptrTopNPortGrantedSize as close
               to this object as is possible for the particular
               implementation and available resources."
       DEFVAL { 10 }
       ::= { rptrTopNPortControlEntry 6 }

   rptrTopNPortGrantedSize OBJECT-TYPE
       SYNTAX      Integer32 (0..65535)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The maximum number of repeater ports in the
               top N table.

               When the associated rptrTopNPortRequestedSize object is
               created or modified, the agent should set this object as
               closely to the requested value as is possible for the
               particular implementation and available resources.  The
               agent must not lower this value except as a result of a
               set to the associated rptrTopNPortRequestedSize object."
       ::= { rptrTopNPortControlEntry 7 }

   rptrTopNPortStartTime OBJECT-TYPE
       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The value of sysUpTime when this top N report was
               last started.  In other words, this is the time that
               the associated rptrTopNPortTimeRemaining object was
               modified to start the requested report.

               If the report has not yet been started, the value
               of this object is zero."
       ::= { rptrTopNPortControlEntry 8 }

   rptrTopNPortOwner OBJECT-TYPE



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       SYNTAX      OwnerString
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
               "The entity that configured this entry and is
               using the resources assigned to it."
       ::= { rptrTopNPortControlEntry 9 }

   rptrTopNPortRowStatus OBJECT-TYPE
       SYNTAX      RowStatus
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
              "The status of this row.

              If the value of this object is not equal to
              active(1), all associated entries in the
              rptrTopNPortTable shall be deleted by the
              agent."
       ::= { rptrTopNPortControlEntry 10 }


   -- Top "N" reports

   rptrTopNPortTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF RptrTopNPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
               "A table of reports for the top `N' ports based on
               setting of associated control table entries. The
               maximum number of entries depends on the number
               of entries in table rptrTopNPortControlTable and
               the value of object rptrTopNPortGrantedSize for
               each entry.

               For each entry in the rptrTopNPortControlTable,
               repeater ports with the highest value of
               rptrTopNPortRate shall be placed in this table
               in decreasing order of that rate until there is
               no more room or until there are no more ports."
       ::= { rptrTopNPortInfo 2 }

   rptrTopNPortEntry OBJECT-TYPE
       SYNTAX      RptrTopNPortEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION



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               "A set of statistics for a repeater port that is
               part of a top N report."
       INDEX    { rptrTopNPortControlIndex,
                  rptrTopNPortIndex }
       ::= { rptrTopNPortTable 1 }

   RptrTopNPortEntry ::= SEQUENCE {
       rptrTopNPortIndex
           Integer32,
       rptrTopNPortGroupIndex
           Integer32,
       rptrTopNPortPortIndex
           Integer32,
       rptrTopNPortRate
           Gauge32
   }

   rptrTopNPortIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..65535)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "An index that uniquely identifies an entry in
               the rptrTopNPort table among those in the same
               report.  This index is between 1 and N, where N
               is the number of entries in this report.  Increasing
               values of rptrTopNPortIndex shall be assigned to
               entries with decreasing values of rptrTopNPortRate
               until index N is assigned to the entry with the
               lowest value of rptrTopNPortRate or there are no
               more rptrTopNPortEntries.

               No ports are included in a report where their
               value of rptrTopNPortRate would be zero."
       ::= { rptrTopNPortEntry 1 }

   rptrTopNPortGroupIndex OBJECT-TYPE
       SYNTAX      Integer32  (1..2147483647)
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "This object identifes the group containing
               the port for this entry. (See also object
               type rptrGroupIndex.)"
       ::= { rptrTopNPortEntry 2 }

   rptrTopNPortPortIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)



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       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The index of the repeater port.
           (See object type rptrPortIndex.)"
       ::= { rptrTopNPortEntry 3 }

   rptrTopNPortRate OBJECT-TYPE
       SYNTAX      Gauge32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
               "The amount of change in the selected variable
               during this sampling interval for the identified
               port.  The selected variable is that port's
               instance of the object selected by
               rptrTopNPortRateBase."
       ::= { rptrTopNPortEntry 4 }



   -- Notifications for use by Repeaters

   rptrHealth NOTIFICATION-TYPE
       OBJECTS     { rptrOperStatus }
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               In a system containing a single managed repeater,
               the rptrHealth notification conveys information
               related to the operational status of the repeater.
               It is sent either when the value of
               rptrOperStatus changes, or upon completion of a
               non-disruptive test.

               The rptrHealth notification must contain the
               rptrOperStatus object.  The agent may optionally
               include the rptrHealthText object in the varBind
               list.  See the rptrOperStatus and rptrHealthText
               objects for descriptions of the information that
               is sent.

               The agent must throttle the generation of
               consecutive rptrHealth traps so that there is at
               least a five-second gap between traps of this
               type.  When traps are throttled, they are dropped,
               not queued for sending at a future time.  (Note



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               that 'generating' a trap means sending to all
               configured recipients.)"
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.3.1, nRepeaterHealth
               notification."
       ::= { snmpDot3RptrMgt 0 1 }

   rptrGroupChange NOTIFICATION-TYPE
       OBJECTS     { rptrGroupIndex }
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               In a system containing a single managed repeater,
               this notification is sent when a change occurs in the
               group structure of the repeater.  This occurs only
               when a group is logically or physically removed
               from or added to a repeater.  The varBind list
               contains the identifier of the group that was
               removed or added.

               The agent must throttle the generation of
               consecutive rptrGroupChange traps for the same
               group so that there is at least a five-second gap
               between traps of this type.  When traps are
               throttled, they are dropped, not queued for
               sending at a future time.  (Note that 'generating'
               a trap means sending to all configured
               recipients.)"
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.3.3, nGroupMapChange
               notification."
       ::= { snmpDot3RptrMgt 0 2 }

   rptrResetEvent NOTIFICATION-TYPE
       OBJECTS     { rptrOperStatus }
       STATUS      deprecated
       DESCRIPTION
               "********* THIS OBJECT IS DEPRECATED **********

               In a system containing a single managed repeater-unit,
               the rptrResetEvent notification conveys information
               related to the operational status of the repeater.
               This trap is sent on completion of a repeater
               reset action.  A repeater reset action is defined
               as an a transition to the START state of Fig 9-2
               in section 9 [IEEE 802.3 Std], when triggered by a
               management command (e.g., an SNMP Set on the



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               rptrReset object).

               The agent must throttle the generation of
               consecutive rptrResetEvent traps so that there is
               at least a five-second gap between traps of this
               type.  When traps are throttled, they are dropped,
               not queued for sending at a future time.  (Note
               that 'generating' a trap means sending to all
               configured recipients.)

               The rptrResetEvent trap is not sent when the agent
               restarts and sends an SNMP coldStart or warmStart
               trap.  However, it is recommended that a repeater
               agent send the rptrOperStatus object as an
               optional object with its coldStart and warmStart
               trap PDUs.

               The rptrOperStatus object must be included in the
               varbind list sent with this trap.  The agent may
               optionally include the rptrHealthText object as
               well."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.3.2, nRepeaterReset
               notification."
       ::= { snmpDot3RptrMgt 0 3 }


   -- Notifications for repeaters in a multiple-repeater implementation.
   -- An implementation may send either the single-repeater OR
   -- multiple-repeater version of these notifications (1 or 4; 2 or 5)
   -- but not both.

   rptrInfoHealth NOTIFICATION-TYPE
       OBJECTS     { rptrInfoOperStatus }
       STATUS      current
       DESCRIPTION
               "In a system containing multiple managed repeaters,
               the rptrInfoHealth notification conveys information
               related to the operational status of a repeater.
               It is sent either when the value of rptrInfoOperStatus
               changes, or upon completion of a non-disruptive test.

               The agent must throttle the generation of
               consecutive rptrInfoHealth notifications for
               the same repeater so that there is at least
               a five-second gap between notifications of this type.
               When notifications are throttled, they are dropped,
               not queued for sending at a future time.  (Note



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               that 'generating' a notification means sending
               to all configured recipients.)"
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.3.1, nRepeaterHealth
               notification."
       ::= { snmpDot3RptrMgt 0 4 }

   rptrInfoResetEvent NOTIFICATION-TYPE
       OBJECTS     { rptrInfoOperStatus }
       STATUS      current
       DESCRIPTION
               "In a system containing multiple managed
               repeaters, the rptrInfoResetEvent notification
               conveys information related to the operational
               status of a repeater. This notification is sent
               on completion of a repeater reset action.  A
               repeater reset action is defined as a transition
               to the START state of Fig 9-2 in section 9 of
               [IEEE 802.3 Std], when triggered by a management
               command (e.g., an SNMP Set on the rptrInfoReset
               object).

               The agent must throttle the generation of
               consecutive rptrInfoResetEvent notifications for
               a single repeater so that there is at least
               a five-second gap between notifications of
               this type.  When notifications are throttled,
               they are dropped, not queued for sending at
               a future time.  (Note that 'generating' a
               notification means sending to all configured
               recipients.)

               The rptrInfoResetEvent is not sent when the
               agent restarts and sends an SNMP coldStart or
               warmStart trap.  However, it is recommended that
               a repeater agent send the rptrInfoOperStatus
               object as an optional object with its coldStart
               and warmStart trap PDUs."
       REFERENCE
               "[IEEE 802.3 Mgt], 30.4.1.3.2, nRepeaterReset
               notification."
       ::= { snmpDot3RptrMgt 0 5 }


   -- Conformance information

   snmpRptrModConf
           OBJECT IDENTIFIER ::= { snmpRptrMod 1 }



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     snmpRptrModCompls
           OBJECT IDENTIFIER ::= { snmpRptrModConf 1 }
     snmpRptrModObjGrps
           OBJECT IDENTIFIER ::= { snmpRptrModConf 2 }
     snmpRptrModNotGrps
           OBJECT IDENTIFIER ::= { snmpRptrModConf 3 }


   -- Object groups

   snmpRptrGrpBasic1516 OBJECT-GROUP
       OBJECTS     { rptrGroupCapacity,
                     rptrOperStatus,
                     rptrHealthText,
                     rptrReset,
                     rptrNonDisruptTest,
                     rptrTotalPartitionedPorts,

                     rptrGroupIndex,
                     rptrGroupDescr,
                     rptrGroupObjectID,
                     rptrGroupOperStatus,
                     rptrGroupLastOperStatusChange,
                     rptrGroupPortCapacity,

                     rptrPortGroupIndex,
                     rptrPortIndex,
                     rptrPortAdminStatus,
                     rptrPortAutoPartitionState,
                     rptrPortOperStatus }
       STATUS      deprecated
       DESCRIPTION
           "********* THIS GROUP IS DEPRECATED **********

           Basic group from RFCs 1368 and 1516.

           NOTE: this object group is DEPRECATED and replaced
                 with snmpRptrGrpBasic."
       ::= { snmpRptrModObjGrps 1 }

   snmpRptrGrpMonitor1516 OBJECT-GROUP
       OBJECTS     { rptrMonitorTransmitCollisions,

                     rptrMonitorGroupIndex,
                     rptrMonitorGroupTotalFrames,
                     rptrMonitorGroupTotalOctets,
                     rptrMonitorGroupTotalErrors,




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                     rptrMonitorPortGroupIndex,
                     rptrMonitorPortIndex,
                     rptrMonitorPortReadableFrames,
                     rptrMonitorPortReadableOctets,
                     rptrMonitorPortFCSErrors,
                     rptrMonitorPortAlignmentErrors,
                     rptrMonitorPortFrameTooLongs,
                     rptrMonitorPortShortEvents,
                     rptrMonitorPortRunts,
                     rptrMonitorPortCollisions,
                     rptrMonitorPortLateEvents,
                     rptrMonitorPortVeryLongEvents,
                     rptrMonitorPortDataRateMismatches,
                     rptrMonitorPortAutoPartitions,
                     rptrMonitorPortTotalErrors }
       STATUS      deprecated
       DESCRIPTION
           "********* THIS GROUP IS DEPRECATED **********

           Monitor group from RFCs 1368 and 1516.

           NOTE: this object group is DEPRECATED and replaced
                 with snmpRptrGrpMonitor."
       ::= { snmpRptrModObjGrps 2 }

   snmpRptrGrpAddrTrack1368 OBJECT-GROUP
       OBJECTS     { rptrAddrTrackGroupIndex,
                     rptrAddrTrackPortIndex,
                     rptrAddrTrackLastSourceAddress,
                     rptrAddrTrackSourceAddrChanges }
       STATUS      obsolete
       DESCRIPTION
           "Address tracking group from RFC 1368.

           NOTE: this object group is OBSOLETE and replaced
                 with snmpRptrGrpAddrTrack1516."
       ::= { snmpRptrModObjGrps 3 }

   snmpRptrGrpAddrTrack1516 OBJECT-GROUP
       OBJECTS     { rptrAddrTrackGroupIndex,
                     rptrAddrTrackPortIndex,
                     rptrAddrTrackLastSourceAddress,
                     rptrAddrTrackSourceAddrChanges,
                     rptrAddrTrackNewLastSrcAddress }
       STATUS      deprecated
       DESCRIPTION
           "********* THIS GROUP IS DEPRECATED **********




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           Address tracking group from RFC 1516.

           NOTE: this object group is DEPRECATED and
                 replaced with snmpRptrGrpAddrTrack."
       ::= { snmpRptrModObjGrps 4 }

   snmpRptrGrpBasic OBJECT-GROUP
       OBJECTS     { rptrGroupIndex,
                     rptrGroupObjectID,
                     rptrGroupOperStatus,
                     rptrGroupPortCapacity,

                     rptrPortGroupIndex,
                     rptrPortIndex,
                     rptrPortAdminStatus,
                     rptrPortAutoPartitionState,
                     rptrPortOperStatus,
                     rptrPortRptrId,

                     rptrInfoId,
                     rptrInfoRptrType,
                     rptrInfoOperStatus,
                     rptrInfoReset,
                     rptrInfoPartitionedPorts,
                     rptrInfoLastChange }
       STATUS      current
       DESCRIPTION
           "Basic group for a system with one or more
           repeater-units in multi-segment (post-RFC 1516)
           version of the MIB module."
       ::= { snmpRptrModObjGrps 5 }

   snmpRptrGrpMonitor OBJECT-GROUP
       OBJECTS     { rptrMonitorPortGroupIndex,
                     rptrMonitorPortIndex,
                     rptrMonitorPortReadableFrames,
                     rptrMonitorPortReadableOctets,
                     rptrMonitorPortFCSErrors,
                     rptrMonitorPortAlignmentErrors,
                     rptrMonitorPortFrameTooLongs,
                     rptrMonitorPortShortEvents,
                     rptrMonitorPortRunts,
                     rptrMonitorPortCollisions,
                     rptrMonitorPortLateEvents,
                     rptrMonitorPortVeryLongEvents,
                     rptrMonitorPortDataRateMismatches,
                     rptrMonitorPortAutoPartitions,
                     rptrMonitorPortTotalErrors,



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                     rptrMonitorPortLastChange,

                     rptrMonTxCollisions,
                     rptrMonTotalFrames,
                     rptrMonTotalErrors,
                     rptrMonTotalOctets }
       STATUS      current
       DESCRIPTION
           "Monitor group for a system with one or more
           repeater-units in multi-segment (post-RFC 1516)
           version of the MIB module."
       ::= { snmpRptrModObjGrps 6 }

   snmpRptrGrpMonitor100 OBJECT-GROUP
       OBJECTS     { rptrMonitorPortIsolates,
                     rptrMonitorPortSymbolErrors,
                     rptrMonitorPortUpper32Octets,

                     rptrMonUpper32TotalOctets }
       STATUS      current
       DESCRIPTION
           "Monitor group for 100Mb/s ports and repeaters
           in a system with one or more repeater-units in
           multi-segment (post-RFC 1516) version of the MIB
           module.  Systems which support Counter64 should
           also implement snmpRptrGrpMonitor100w64."
       ::= { snmpRptrModObjGrps 7 }

   snmpRptrGrpMonitor100w64 OBJECT-GROUP
       OBJECTS     { rptrMonitorPortHCReadableOctets,
                     rptrMonHCTotalOctets }
       STATUS      current
       DESCRIPTION
           "Monitor group for 100Mb/s ports and repeaters in a
           system with one or more repeater-units and support
           for Counter64."
       ::= { snmpRptrModObjGrps 8 }

   snmpRptrGrpAddrTrack OBJECT-GROUP
       OBJECTS     { rptrAddrTrackGroupIndex,
                     rptrAddrTrackPortIndex,
                     rptrAddrTrackSourceAddrChanges,
                     rptrAddrTrackNewLastSrcAddress,
                     rptrAddrTrackCapacity }
       STATUS      current
       DESCRIPTION
           "Passive address tracking group for post-RFC 1516
           version of the MIB module."



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       ::= { snmpRptrModObjGrps 9 }

   snmpRptrGrpExtAddrTrack OBJECT-GROUP
       OBJECTS     { rptrExtAddrTrackMacIndex,
                     rptrExtAddrTrackSourceAddress }
       STATUS      current
       DESCRIPTION
           "Extended passive address tracking group for
           a system with one or more repeater-units in
           post-RFC 1516 version of the MIB module."
       ::= { snmpRptrModObjGrps 10 }

   snmpRptrGrpRptrAddrSearch OBJECT-GROUP
       OBJECTS     { rptrAddrSearchLock,
                     rptrAddrSearchStatus,
                     rptrAddrSearchAddress,
                     rptrAddrSearchState,
                     rptrAddrSearchGroup,
                     rptrAddrSearchPort,
                     rptrAddrSearchOwner }
       STATUS      current
       DESCRIPTION
           "Active MAC address search group and topology
           mapping support for repeaters."
       ::= { snmpRptrModObjGrps 11 }

   snmpRptrGrpTopNPort OBJECT-GROUP
       OBJECTS     { rptrTopNPortControlIndex,
                     rptrTopNPortRepeaterId,
                     rptrTopNPortRateBase,
                     rptrTopNPortTimeRemaining,
                     rptrTopNPortDuration,
                     rptrTopNPortRequestedSize,
                     rptrTopNPortGrantedSize,
                     rptrTopNPortStartTime,
                     rptrTopNPortOwner,
                     rptrTopNPortRowStatus,
                     rptrTopNPortIndex,
                     rptrTopNPortGroupIndex,
                     rptrTopNPortPortIndex,
                     rptrTopNPortRate }
       STATUS      current
       DESCRIPTION
           "Top `N' group for repeater ports."
       ::= { snmpRptrModObjGrps 12 }


   -- Compliances



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   snmpRptrModComplRFC1368 MODULE-COMPLIANCE
       STATUS      obsolete
       DESCRIPTION
           "Compliance for RFC 1368.

           NOTE: this module compliance is OBSOLETE and
                 replaced by snmpRptrModComplRFC1516."

       MODULE -- this module
           MANDATORY-GROUPS { snmpRptrGrpBasic1516 }

           GROUP snmpRptrGrpMonitor1516
           DESCRIPTION
               "Implementation of this optional group is
               recommended for systems which have the
               instrumentation to do performance monitoring."

           GROUP snmpRptrGrpAddrTrack1368
           DESCRIPTION
               "Implementation of this group is
               recommended for systems which have
               the necessary instrumentation."

       ::= { snmpRptrModCompls 1 }

   snmpRptrModComplRFC1516 MODULE-COMPLIANCE
       STATUS      deprecated
       DESCRIPTION
           "********* THIS COMPLIANCE IS DEPRECATED **********

           Compliance for RFC 1516 and for backwards
           compatibility with single-repeater,
           10Mb/s-only implementations."

       MODULE -- this module
           MANDATORY-GROUPS { snmpRptrGrpBasic1516 }

           GROUP snmpRptrGrpMonitor1516
           DESCRIPTION
               "Implementation of this optional group is
               recommended for systems which have the
               instrumentation to do performance monitoring."

           GROUP snmpRptrGrpAddrTrack1516
           DESCRIPTION
               "Implementation of this group is
               recommended for systems which have
               the necessary instrumentation."



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       ::= { snmpRptrModCompls 2 }

   snmpRptrModCompl MODULE-COMPLIANCE
       STATUS      current
       DESCRIPTION
           "Compliance for the multi-segment version of the
           MIB module for a system with one or more
           repeater-units."

       MODULE -- this module
           MANDATORY-GROUPS { snmpRptrGrpBasic,
                              snmpRptrGrpMonitor,
                              snmpRptrGrpAddrTrack }

           GROUP snmpRptrGrpMonitor100
           DESCRIPTION
               "Implementation of this group is
               mandatory for managed systems which
               contain 100Mb/s repeaters."

           GROUP snmpRptrGrpMonitor100w64
           DESCRIPTION
               "Implementation of this group is
               mandatory for managed systems which
               contain 100Mb/s repeaters and which
               can support Counter64."

           GROUP snmpRptrGrpExtAddrTrack
           DESCRIPTION
               "Implementation of this group is
               recommended for systems which have
               the necessary instrumentation to track
               MAC addresses of multiple DTEs attached
               to a single repeater port."

           GROUP snmpRptrGrpRptrAddrSearch
           DESCRIPTION
               "Implementation of this group is
               recommended for systems which allow
               read-write access and which have
               the necessary instrumentation to
               search all incoming data streams
               for a particular MAC address."

           GROUP snmpRptrGrpTopNPort
           DESCRIPTION
               "Implementation of this group is
               recommended for systems which have



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               the necessary resources to support
               TopN statistics reporting."

       ::= { snmpRptrModCompls 3 }


   END












































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4.  Topology Mapping

   The network mapping algorithm presented below takes information
   available from network devices such as repeaters, bridges, and
   switches, and creates a representation of the physical topology of
   the network.

   Networking devices connect to the network via one or more ports.
   Through these ports, the device is capable of hearing network packets
   sent by other devices.  By looking the source address in the packet,
   and identifying which port the packet was heard on, the device can
   provide information to a Network Management System about the location
   of an address in the network, relative to that device.  For devices
   such as bridges and switches, the association of address to port can
   be retrieved via the forwarding data base part of the Bridge MIB.
   For repeaters, the rptrAddrSearchTable may be used to perform the
   association.

   Given this information, it would be possible for the NMS to create a
   topology of the network which represents the physical relationships
   of the devices in the networks.  The following is an example of how
   this might be done:

   Assume the network:

                 =============================
                     |            |       |
                     |            |       |
                    d1           d4      d7
                   /  \          |
                  /    \         |
                d2      d3       d5
                                  |
                                  |
                                 d6

   The discovery process would first determine the existence of the
   network devices and nodes in the network.  In the above example, the
   network devices discovered would be:

                           d1,d2,d3,d4,d5,d6,d7

   From this list of discovered devices, select (arbitrarily or via some
   heuristic) a device as the starting point.  From that device,
   determine where all other devices are located in the network with
   respect to the selected device.





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   For example, if d1 is the selected device, the network in relation to
   d1 would look like:

                    d1
                   / | \
                  /  |  \
                d2  d3   d4,d5,d6,d7

   So d1 sees d2 on one port, d3 on another port, and d4, d5, and d6 on
   the third port.  In other words, using the rptrAddrSearchTable (if d1
   is a repeater) or the Forwarding Database (if it is a bridge or a
   switch), d1 has located d2 on one port, d1 has located d3 on another
   port, and finally, d1 has located d4, d5, d6, and d7 on yet another
   port.

   After the first step of the algorithm is accomplished, the next and
   final step is a recursive one.  Go to each of these temporary
   'segments' (e.g., the segment connecting d1 and d2, or the segment
   connecting d1 and d3, or the segment connecting d1, d4, d5, d6, and
   d7) and determine which of these devices really belongs in that
   segment.

   As new segments are created due to this process, the recursive
   algorithm visits them, and performs the exact same process.

   In the example, the segments connecting d1 and d2, and connecting d1
   and d3, require no further scrutiny, since there are only two nodes
   in those segments.  However, the segment connecting d1, d4, d5, d6,
   and d7 may prove to be one or more segments, so we will investigate
   it.

   The purpose of this step is to determine which devices are really
   connected to this segment, and which are actually connected
   downstream.  This is done by giving each of the child devices in the
   segment (d4, d5, d6, and d7) a chance to eliminate each of the others
   from the segment.

   A device eliminates another device by showing that it hears the
   parent device (in this case, d1) on one port, and the other device on
   another port (different from the port on which it heard the parent).
   If this is true, then it must mean that that device is _between_ the
   parent device and the device which is being eliminated.









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   In the example, we can see that device d4 can eliminate both d5 and
   d6, , but nobody can eliminate d4 and d7, because everybody hears
   them on the same port that they hear the parent device (d1).  So the
   resulting topology looks like:

                    d1
                   / | \
                  /  |  \
                d2  d3   d4,d7
                         |
                         |
                       d5,d6

   Next the algorithm visits the next segment, which is the one
   connecting d4, d5, and d6.  Using the process stated above, d5 can
   eliminate d6, since it hears d4 on a different port from where it
   hears d6.  Finally, the topology looks like:

                    d1
                   / | \
                  /  |  \
                d2  d3   d4,d7
                         |
                         |
                         d5
                         |
                         |
                         d6


   This is actually the topology shown at the beginning of the
   description.

   With this information about how the network devices are connected, it
   is a relatively simple extension to then place nodes such as
   workstations and PCs in the network.  This can be done by placing the
   node into a segment, then allowing the network devices to show that
   the node is really not part of that segment.

   This elimination can be done because the devices know what port
   connects them to the segment on which the node is temporarily placed.
   If they actually hear the node on a different port than that which
   connects the device to the segment, then the node must be downstream,
   and so it is moved onto the downstream segment.  Then that segment is
   evaluated, and so forth.  Eventually, no device can show that the
   node is connected downstream, and so it must be attached to that
   segment.




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   For example, assume the network:

                   =============================
                       |            |       |
                       |            |       |
                      d1           d4      d7
                     /  \          |
                    /    \         |
                  d2      d3       d5
                          |         |
                          |         |
                          e1       d6

   In this network, we are trying to place e1 where it belongs.  We
   begin by placing it arbitrarily into a segment:

                ==================================
                  |       |            |       |
                  |       |            |       |
                 e1      d1           d4      d7
                        /  \          |
                       /    \         |
                     d2      d3       d5
                                       |
                                       |
                                      d6

   In the above case, we would give d1, d4, and d7 a chance to show that
   e1 is not really on that segment.  d4 and d7 hear e1 on the same port
   which connects them to that segment, so they cannot eliminate e1 from
   the segment.  However, d1 will hear e1 on a different port, so we
   move e1 down onto the segment which is connected by that port.  This
   yields the following:

                   =============================
                       |            |       |
                       |            |       |
                      d1           d4      d7
                     /  \          |
                    /    \         |
                  d2      d3,e1    d5
                                    |
                                    |
                                   d6







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   Now we give everyone in that segment (besides that parent device, d1)
   a chance to eliminate e1.  Only d3 can try, and it succeeds, so we
   place e1 on segment which is connected by the port on which d3 heard
   e1.  There is no segment there (yet), so we create one, and end up
   with the following:

                   =============================
                       |            |       |
                       |            |       |
                      d1           d4      d7
                     /  \          |
                    /    \         |
                  d2      d3       d5
                          |        |
                          |         |
                          e1       d6

   which is the correct position.

5.  Acknowledgements


   This document was produced by the IETF Hub MIB Working Group, whose
   efforts were greatly advanced by the contributions of the following
   people:

               Chuck Black
               John Flick
               Jeff Johnson
               Leon Leong
               Mike Lui
               Dave Perkins
               Geoff Thompson
               Maurice Turcotte
               Paul Woodruff
















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6.  References

   [1]  IEEE 802.3/ISO 8802-3 Information processing systems -
        Local area networks - Part 3:  Carrier sense multiple
        access with collision detection (CSMA/CD) access method
        and physical layer specifications, 1993.

   [2]  IEEE 802.3u-1995, "MAC Parameters, Physical Layer, Medium
        Attachment Units and Repeater for 100 Mb/s Operation,
        Type 100BASE-T," Sections 21 through 29, Supplement to
        IEEE Std 802.3, October 26, 1995.

   [3]  IEEE 802.3u-1995, "10 & 100 Mb/s Management," Section 30,
        Supplement to IEEE Std 802.3, October 26, 1995.

   [4]  de Graaf, K., D. Romascanu, D. McMaster, K. McCloghrie,
        and S. Roberts, "Definitions of Managed Objects for IEEE
        802.3 Medium Attachment Units (MAUs)", Work in Progress.

   [5]  McCloghrie, K., and M. Rose, Editors, "Management
        Information Base for Network Management of TCP/IP-based
        internets: MIB-II", STD 17, RFC 1213, Hughes LAN Systems,
        Performance Systems International, March 1991.

   [6]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose,
        and S. Waldbusser, "Structure of Management Information
        for version 2 of the Simple Network Management Protocol
        (SNMPv2)", RFC 1902, January 1996.

   [7]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose,
        and S. Waldbusser, "Textual Conventions for version 2 of
        the Simple Network Management Protocol (SNMPv2)", RFC
        1903, January 1996.

   [8]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose,
        and S. Waldbusser, "Conformance Statements for version 2
        of the Simple Network Management Protocol (SNMPv2)", RFC
        1904, January 1996.

   [9]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose,
        and S. Waldbusser, "Protocol Operations for version 2 of
        the Simple Network Management Protocol (SNMPv2)", RFC
        1905, January 1996.








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   [10] Case, J., M. Fedor, M. Schoffstall, and J. Davin, "Simple
        Network Management Protocol", STD 15, RFC 1157, SNMP
        Research, Performance Systems International, MIT Laboratory
        for Computer Science, May 1990.

   [11] McMaster, D., and K. McCloghrie, "Definitions of Managed
        Objects for IEEE 802.3 Repeater Devices", RFC 1516,
        September 1993.

   [12] McAnally, G., D. Gilbert, and J. Flick, "Conditional
        Grant of Rights to Specific Hewlett-Packard Patents In
        Conjunction With the Internet Engineering Task Force's
        Internet-Standard Network Management Framework", RFC 1988,
        August 1996.

   [13] Hewlett-Packard Company, US Patents 5,293,635 and
        5,421,024.

   [14] McCloghrie, K., and F. Kastenholz, "Evolution of the
        Interfaces Group of MIB-II", RFC 1573, January 1994.

7.  Security Considerations

   Security issues are not discussed in this memo.

8.  Authors' Addresses

   Kathryn de Graaf
   3Com Corporation
   118 Turnpike Rd.
   Southborough, MA 01772 USA

   Phone: (508)229-1627
   Fax: (508)490-5882
   EMail: kdegraaf@isd.3com.com


   Dan Romascanu
   Madge Networks (Israel) Ltd.
   Atidim Technology Park, Bldg. 3
   Tel Aviv 61131, Israel

   Phone: 972-3-6458414, 6458458
   Fax: 972-3-6487146
   EMail: dromasca@madge.com






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   Donna McMaster
   Cisco Systems Inc.
   170 West Tasman Drive
   San Jose, CA 95134

   Phone: (408) 526-5260
   EMail: mcmaster@cisco.com


   Keith McCloghrie
   Cisco Systems Inc.
   170 West Tasman Drive
   San Jose, CA 95134

   Phone: (408) 526-5260
   EMail: kzm@cisco.com



































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