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RFC 1516:
Definitions of Managed Objects for IEEE 802

 







Network Working Group                                        D. McMaster
Request for Comments: 1516                SynOptics Communications, Inc.
Obsoletes: 1368                                            K. McCloghrie
                                                Hughes LAN Systems, Inc.
                                                          September 1993


                     Definitions of Managed Objects
                    for IEEE 802.3 Repeater Devices

Status of this Memo

   This RFC 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" 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
   Mb/second baseband repeaters, sometimes referred to as "hubs."

Table of Contents

   1. The Network Management Framework ......................    2
   1.1 Object Definitions ...................................    2
   2. Overview ..............................................    2
   2.1 Terminology ..........................................    3
   2.1.1 Repeaters, Hubs and Concentrators ..................    3
   2.1.2 Repeaters, Ports, and MAUs .........................    3
   2.1.3 Ports and Groups ...................................    5
   2.1.4 Internal Ports and MAUs ............................    6
   2.2 Supporting Functions .................................    7
   2.3 Structure of MIB .....................................    9
   2.3.1 The Basic Group Definitions ........................   10
   2.3.2 The Monitor Group Definitions ......................   10
    2.3.3 The Address Tracking Group Definitions ............   10
   2.4 Relationship to Other MIBs ...........................   10
   2.4.1 Relationship to the 'system' group .................   10
   2.4.2 Relationship to the 'interfaces' group .............   10
   2.5 Textual Conventions ..................................   11
   3. Definitions ...........................................   11
   3.1 MIB Groups in the Repeater MIB .......................   12
   3.2 The Basic Group Definitions ..........................   13
   3.3 The Monitor Group Definitions ........................   23



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   3.4 The Address Tracking Group Definitions ...............   34
   3.5 Traps for use by Repeaters ...........................   36
   4. Changes from RFC 1368 .................................   38
   5. Acknowledgments .......................................   39
   6. References ............................................   39
   7. Security Considerations ...............................   40
   8. Authors' Addresses ....................................   40

1.  The Network Management Framework

   The Internet-standard Network Management Framework consists of
    three components.  They are:

      o STD 16, RFC 1155 which defines the SMI, the mechanisms used for
        describing and naming objects for the purpose of management.
        STD 16, RFC 1212 defines a more concise description mechanism,
        which is wholly consistent with the SMI.

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

      o STD 15, RFC 1157 which defines the SNMP, the protocol used for
        network access to managed objects.

   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 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

   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 [7].

   These Repeater MIB objects may be used to manage non-standard
   repeater-like devices, but defining objects to describe



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   implementation-specific properties of non-standard repeater-like
   devices is outside the scope of this memo.

   The definitions presented here are based on the IEEE draft standard
   P802.3K, "Layer Management for 10 Mb/s Baseband Repeaters" [8].
   Implementors of these MIB objects should note that [8] 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 the IEEE 802.3 Repeater Management draft, with the
   intention that the same instrumentation can be used to implement both
   the IEEE and IETF management standards.

2.1.  Terminology

2.1.1.  Repeaters, Hubs and Concentrators

   In late 1988, the IEEE 802.3 Hub Management task force was chartered
   to define managed objects for both 802.3 repeaters and the proposed
   10BASE-FA synchronous active stars.  The term "hub" was used to cover
   both repeaters and active stars.

   In March, 1991, the active star proposal was dropped from the
   10BASE-F draft.  Subsequently the 802.3 group changed the name of the
   task force to be the IEEE 802.3 Repeater Management Task Force, and
   likewise renamed their draft.

   The use of the term "hub" has led to some confusion, as the terms
   "hub," "intelligent hub," and "concentrator" are often used to
   indicate a modular chassis with plug-in modules that provide
   generalized LAN/WAN connectivity, often with a mix of 802.3 repeater,
   token ring, and FDDI connectivity, internetworked by bridges,
   routers, and terminal servers.

   To be clear that this work covers the management of IEEE 802.3
   repeaters only, the editors of this MIB definitions document chose to
   call this a "Repeater MIB" instead of a "Hub MIB."

2.1.2.  Repeaters, Ports, and MAUs

   The following text roughly defines the terms "repeater," "port," and
   "MAU" as used in the context of this memo.  This text is imprecise
   and omits many technical details.  For a more complete and precise
   definition of these terms, refer to Section 9 of [7].




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   An IEEE 802.3 repeater connects "Ethernet-like" media segments
   together to extend the network length and topology beyond what can be
   achieved with a single coax segment.  It can be pictured as a star
   structure with two or more input/output ports.  The diagram below
   illustrates a 6-port repeater:

                           ^      ^
                           |      |
                          \ \   / /
                           \ \ / /
                       _____\ v /_____
                    -> ______   ______ ->
                            / ^ \
                           / / \ \
                          / /   \ \
                           |      |
                           v      v

                    Figure 1.  Repeater Unit

   All the stations on the media segments connected to a given
   repeater's ports participate in a single collision domain.  A packet
   transmitted by any of these stations is seen by all of these
   stations.

   Data coming in on any port in the repeater is transmitted out through
   each of the remaining n-1 ports.  If data comes in to the repeater on
   two or more ports simultaneously or the repeater detects a collision
   on the incoming port, the repeater transmits a jamming signal out on
   all ports for the duration of the collision.

   A repeater is a bit-wise store-and-forward device.  It is
   differentiated from a bridge (a frame store-and-forward device) in
   that it is primarily concerned with carrier sense and data bits, and
   does not make data-handling decisions based on the legality or
   contents of a packet.  A repeater retransmits data bits as they are
   received.  Its data FIFO holds only enough bits to make sure that the
   FIFO does not underflow when the data rate of incoming bits is
   slightly slower than the repeater's transmission rate.

   A repeater is not an end-station on the network, and does not count
   toward the overall limit of 1024 stations.  A repeater has no MAC
   address associated with it, and therefore packets may not be
   addressed to the repeater or to its ports.  (Packets may be addressed
   to the MAC address of a management entity that is monitoring a
   repeater.  This management entity may or may not be connected to the
   network through one of the repeater's ports.  How the management
   entity obtains information about the activity on the repeater is an



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   implementation issue, and is not discussed in this memo.)

   A repeater is connected to the network with Medium Attachment Units
   (MAUs), and sometimes through Attachment Unit Interfaces (AUIs) as
   well.  ("MAUs" are also known as transceivers, and an "AUI" is the
   same as a 15-pin Ethernet or DIX connector.)

   The 802.3 standard defines a "repeater set" as the "repeater unit"
   plus its associated MAUs (and AUIs if present).  The "repeater unit"
   is defined as the portion of the repeater set that is inboard of the
   physical media interfaces.  The MAUs may be physically separate from
   the repeater unit, or they may be integrated into the same physical
   package.

                        (MAU)   (MAU)
                          \ \   / /
                           \ \ / /
                       _____\ v /_____
                 (MAU) ______   ______ (MAU)
                            / ^ \
                           / / \ \
                          / /   \ \
                        (MAU)   (MAU)

                    Figure 2.  Repeater Set

   The most commonly-used MAUs are the 10BASE-5 (AUI to thick "yellow"
   coax), 10BASE-2 (BNC to thin coax), 10BASE-T (unshielded twisted-
   pair), and FOIRL (asynchronous fiber optic inter-repeater link, which
   is being combined into the 10BASE-F standard as 10BASE-FL).  The
   draft 10BASE-F standard also includes the definition for a new
   synchronous fiber optic attachment, known as 10BASE-FB.

   It should be stressed that the repeater MIB being defined by the IEEE
   covers only the repeater unit management - it does not include
   management of the MAUs that form the repeater set.  The IEEE
   recognizes that MAU management should be the same for MAUs connected
   to end-stations (DTEs) as it is for MAUs connected to repeaters.
   This memo follows the same strategy; the definition of management
   information for MAUs is being addressed in a separate memo.

2.1.3.  Ports and Groups

   Repeaters are often implemented in modular "concentrators," where a
   card cage holds several field-replaceable cards.  Several cards may
   form a single repeater unit, with each card containing one or more of
   the repeater's ports.  Because of this modular architecture, users
   typically identify these repeater ports with a card number plus the



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   port number relative to the card, e.g., Card 3, Port 11.

   To support this modular numbering scheme, this document follows the
   example of the IEEE Repeater Management draft [8], allowing an
   implementor to separate the ports in a repeater into "groups", if
   desired.  For example, an implementor might choose to represent
   field-replaceable units as groups of ports so that the port numbering
   would match the modular hardware implementation.

   This group mapping is recommended but optional.  An implementor may
   choose to put all of a modular repeater's ports into a single group,
   or to divide the ports into groups that do not match physical
   divisions.

   The object rptrGroupCapacity, which has a maximum value of 1024,
   indicates the maximum number of groups that a given repeater may
   contain.  The value of rptrGroupCapacity must remain constant from
   one management restart to the next.

   Each group within the repeater is uniquely identified by a group
   number in the range 1..rptrGroupCapacity.  Groups may come and go
   without causing a management reset, and may be sparsely numbered
   within the repeater.  For example, in a 12- card cage, cards 3, 5, 6,
   and 7 may together form a single repeater, and the implementor may
   choose to number them as groups 3, 5, 6, and 7, respectively.

   The object rptrGroupPortCapacity, which also has a maximum value of
   1024, indicates the maximum number of ports that a given group may
   contain.  The value of rptrGroupPortCapacity must not change for a
   given group.  However, a group may be deleted from the repeater and
   replaced with a group containing a different number of ports.  The
   value of rptrGroupLastOperStatusChange will indicate that a change
   took place.

   Each port within the repeater is uniquely identified by a combination
   of group number and port number, where port number is an integer in
   the range 1..rptrGroupPortCapacity.  As with groups within a
   repeater, ports within a group may be sparsely numbered.  Likewise,
   ports may come and go within a group without causing a management
   reset.

2.1.4.  Internal Ports and MAUs

   Repeater ports may be thought of as sources of traffic into the
   repeater.  In addition to the externally visible ports mentioned
   above, such as those with 10BASE-T MAUs, or AUI ports with external
   transceivers, some implementations may have internal ports that are
   not obvious to the end-user but are nevertheless sources of traffic



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   into the repeater.  Examples include internal management ports,
   through which an agent communicates, and ports connecting to a
   backplane internal to the implementation.

   Some implementations may not manage all of a repeater's ports.  For
   managed ports, there must be entries in the port table; unmanaged
   ports will not show up in the table.

   It is the decision of the implementor to select the appropriate
   group(s) in which to place internal ports.  GroupCapacity for a given
   group always reflects the number of MANAGED ports in that group.

   If some ports are unmanaged such that not all packet sources are
   represented by managed ports, then the sum of the input counters for
   the repeater will not equal the actual output of the repeater.

2.2.  Supporting Functions

   The IEEE 802.3 Hub Management draft [8] defines the following seven
   functions and seven signals used to describe precisely when port
   counters are incremented.  The relationship between the functions and
   signals is shown in Figure 3.

   The CollisionEvent, ActivityDuration, CarrierEvent, FramingError,
   OctetCount, FCSError, and SourceAddress output signals defined here
   are not retrievable MIB objects, but rather are concepts used in
   defining the MIB objects.  The inputs are defined in Section 9 of the
   IEEE 802.3 standard [7].























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              +---------+
              |Collision|--------------------->CollisionEvent
   CollIn(X)+>|Event    |
            | |Funct    |          +--------+
            | +---------+          |Activity|
            | +-------+            |Timing  |->ActivityDuration
            +>|Carrier|      +---->|Funct   |
              |Event  |      |     +--------+
   DataIn(X)->|Funct  |+-----+---------------->CarrierEvent
              +-------+|
                       | +-------+
                       +>|Framing|------------>FramingError
                         |Funct  |  +-------+
   decodedData---------->|       |+>|Octet  |
                         +-------+| |Count  |->OctetCount
                                  | |Funct  |
                                  | +-------+
                                  | +-------+
                           Octet  | |Cyclic |
                           Stream +>|Redund.|
                                  | |Check  |->FCSError
                                  | |Funct  |
                                  | +-------+
                                  | +-------+
                                  | |Source |
                                  +>|Address|->SourceAddress
                                    |Funct  |
                                    +-------+

             Figure 3.  Port Functions Relationship

   Collision Event Function:  The collision event function asserts the
   CollisionEvent signal when the CollIn(X) variable has the value
   SQE.  The CollisionEvent signal remains asserted until the assertion
   of any CarrierEvent signal due to the reception of the following
   event.

   Carrier Event Function:  The carrier event function asserts the
   CarrierEvent signal when the repeater exits the IDLE state, Fig 9-2
   [7], and the port has been determined to be port N.  It deasserts
   the CarrierEvent signal when, for a duration of at least Carrier
   Recovery Time (Ref: 9.5.6.5 [7]), both the DataIn(N) variable has
   the value II and the CollIn(N) variable has the value -SQE.  The
   value N is the port assigned at the time of transition from the IDLE
   state.

   Framing Function:  The framing function recognizes the boundaries of
   an incoming frame by monitoring the CarrierEvent signal and the



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   decoded data stream.  Data bits are accepted while the CarrierEvent
   signal is asserted.  The framing function strips preamble and start
   of frame delimiter from the received data stream.  The remaining
   bits are aligned along octet boundaries.  If there is not an
   integral number of octets, then FramingError shall be asserted.  The
   FramingError signal is cleared upon the assertion of the
   CarrierEvent signal due to the reception of the following event.

   Activity Timing Function:  The activity timing function measures the
   duration of the assertion of the CarrierEvent signal.  This duration
   value must be adjusted by removing the value of Carrier Recovery
   Time (Ref: 9.5.6.5 [7]) to obtain the true duration of activity on
   the network.  The output of the Activity Timing function is the
   ActivityDuration value, which represents the duration of the
   CarrierEvent signal as expressed in units of bit times.

   Octet Counting Function:  The octet counting function counts the
   number of complete octets received from the output of the framing
   function.  The output of the octet counting function is the
   OctetCount value.  The OctetCount value is reset to zero upon the
   assertion of the CarrierEvent signal due to the reception of the
   following event.

   Cyclic Redundancy Check Function:  The cyclic redundancy check
   function verifies that the sequence of octets output by the framing
   function contains a valid frame check sequence field.  The frame
   check sequence field is the last four octets received from the
   output of the framing function.  The algorithm for generating an FCS
   from the octet stream is specified in 3.2.8 [7].  If the FCS
   generated according to this algorithm is not the same as the last
   four octets received from the framing function then the FCSError
   signal is asserted.  The FCSError signal is cleared upon the
   assertion of the CarrierEvent signal due to the reception of the
   following event.

   Source Address Function:  The source address function extracts
   octets from the stream output by the framing function.  The seventh
   through twelfth octets shall be extracted from the octet stream and
   output as the SourceAddress variable.  The SourceAddress variable is
   set to an invalid state upon the assertion of the CarrierEvent
   signal due to the reception of the following event.

2.3.  Structure of MIB

   Objects in this MIB are arranged into MIB groups.  Each MIB group is
   organized as a set of related objects.





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2.3.1.  The Basic Group Definitions

   This mandatory group contains the objects which are applicable to
   all repeaters.  It contains status, parameter and control objects
   for the repeater as a whole, the port groups within the repeater, as
   well as for the individual ports themselves.

2.3.2.  The Monitor Group Definitions

   This optional group contains monitoring statistics for the repeater
   as a whole and for individual ports.

2.3.3.  The Address Tracking Group Definitions

   This optional group contains objects for tracking the MAC addresses
   of the DTEs attached to the ports of the repeater.

2.4.  Relationship to Other MIBs

   It is assumed that a repeater implementing this MIB will also
   implement (at least) the 'system' group defined in MIB-II [3].

2.4.1.  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 a
   repeater.

2.4.2.  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
   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



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   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 the 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.)

2.5.  Textual Conventions

   The datatype MacAddress is used as a textual convention in this
   document.  This textual convention has NO effect on either the
   syntax nor the semantics of any managed object.  Objects defined
   using this convention are always encoded by means of the rules that
   define their primitive type.  Hence, no changes to the SMI or the
   SNMP are necessary to accommodate this textual convention which is
   adopted merely for the convenience of readers.

3.  Definitions

   SNMP-REPEATER-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       Counter, TimeTicks, Gauge
                                           FROM RFC1155-SMI
       DisplayString                       FROM RFC1213-MIB
       TRAP-TYPE                           FROM RFC-1215
       OBJECT-TYPE                         FROM RFC-1212;


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


   -- All representations of MAC addresses in this MIB Module use,
   -- as a textual convention (i.e., this convention does not affect
   -- their encoding), the data type:

   MacAddress ::= OCTET STRING (SIZE (6))    -- a 6 octet address in
                                             -- the "canonical" order
   -- defined by IEEE 802.1a, i.e., as if it were transmitted least
   -- significant bit first.


   --                      References
   --
   -- The following references are used throughout this MIB:
   --



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   -- [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 collision detection (CSMA/CD)
   --    access method and physical layer specifications
   --    (2nd edition, September 21, 1990).
   --
   -- [IEEE 802.3 Rptr Mgt]
   --    refers to IEEE P802.3K, 'Layer Management for 10 Mb/s
   --    Baseband Repeaters, Section 19,' Draft Supplement to
   --    ANSI/IEEE 802.3, (Draft 8, April 9, 1992)


   --                      MIB Groups
   --
   -- The rptrBasicPackage group is mandatory.
   -- The rptrMonitorPackage and rptrAddrTrackPackage
   -- groups are optional.


   rptrBasicPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 1 }

   rptrMonitorPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 2 }

   rptrAddrTrackPackage
       OBJECT IDENTIFIER ::= { snmpDot3RptrMgt 3 }


   -- object identifiers for organizing the information
   -- in the groups by repeater, port-group, and port

   rptrRptrInfo
       OBJECT IDENTIFIER ::= { rptrBasicPackage 1 }
   rptrGroupInfo
       OBJECT IDENTIFIER ::= { rptrBasicPackage 2 }
   rptrPortInfo
       OBJECT IDENTIFIER ::= { rptrBasicPackage 3 }

   rptrMonitorRptrInfo
       OBJECT IDENTIFIER ::= { rptrMonitorPackage 1 }
   rptrMonitorGroupInfo
       OBJECT IDENTIFIER ::= { rptrMonitorPackage 2 }
   rptrMonitorPortInfo
       OBJECT IDENTIFIER ::= { rptrMonitorPackage 3 }

   rptrAddrTrackRptrInfo     -- this subtree is currently unused



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       OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 1 }
   rptrAddrTrackGroupInfo    -- this subtree is currently unused
       OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 2 }
   rptrAddrTrackPortInfo
       OBJECT IDENTIFIER ::= { rptrAddrTrackPackage 3 }


   --
   --                    The BASIC GROUP
   --
   -- Implementation of the Basic Group is mandatory for all
   -- managed repeaters.

   --
   -- Basic Repeater Information
   --
   -- Configuration, status, and control objects for the overall
   -- repeater
   --

   rptrGroupCapacity OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.2,
               aRepeaterGroupCapacity."
       ::= { rptrRptrInfo 1 }

   rptrOperStatus OBJECT-TYPE



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       SYNTAX  INTEGER {
                   other(1),            -- undefined or unknown status
                   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
               }
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.2,
               aRepeaterHealthState."
       ::= { rptrRptrInfo 2 }

   rptrHealthText OBJECT-TYPE
       SYNTAX    DisplayString (SIZE (0..255))
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.2,
               aRepeaterHealthText."
       ::= { rptrRptrInfo 3 }



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   rptrReset OBJECT-TYPE
       SYNTAX    INTEGER {
                     noReset(1),
                     reset(2)
                 }
       ACCESS    read-write
       STATUS    mandatory
       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].

               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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.3,
               acResetRepeater."
       ::= { rptrRptrInfo 4 }

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



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                     selfTest(2)
                 }
       ACCESS    read-write
       STATUS    mandatory
       DESCRIPTION
               "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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.3,
               acExecuteNonDisruptiveSelfTest."
       ::= { rptrRptrInfo 5 }

   rptrTotalPartitionedPorts OBJECT-TYPE
       SYNTAX    Gauge
       ACCESS    read-only
       STATUS    mandatory
       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)."
       ::= { rptrRptrInfo 6 }







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   --
   -- The Basic Port Group Table
   --

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

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

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

   rptrGroupIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the group within the
               repeater for which this entry contains
               information.  This value is never greater than
               rptrGroupCapacity."



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       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.5.2,
               aGroupID."
       ::= { rptrGroupEntry 1 }

   rptrGroupDescr OBJECT-TYPE
       SYNTAX    DisplayString (SIZE (0..255))
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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
       ACCESS    read-only
       STATUS    mandatory
       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),
                     operational(2),
                     malfunctioning(3),
                     notPresent(4),



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                     underTest(5),
                     resetInProgress(6)
                 }
       ACCESS    read-only
       STATUS    mandatory
       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
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "An object that contains the value of sysUpTime at
               the time that the value of the rptrGroupOperStatus
               object for this group last 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    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "The rptrGroupPortCapacity is the number of ports
               that can be contained within the group.  Valid
               range is 1-1024.  Within each group, the ports are
               uniquely numbered in the range from 1 to
               rptrGroupPortCapacity.

               Note:  In practice, this will generally be the



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               number of ports on a module, card, or board, and
               the port numbers will correspond to numbers marked
               on the physical embodiment."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.5.2,
               aGroupPortCapacity."
       ::= { rptrGroupEntry 6 }


   --
   -- The Basic Port Table
   --

   rptrPortTable OBJECT-TYPE
       SYNTAX    SEQUENCE OF RptrPortEntry
       ACCESS    not-accessible
       STATUS    mandatory
       DESCRIPTION
               "Table of descriptive and status information about
               the ports."
       ::= { rptrPortInfo 1 }

   rptrPortEntry OBJECT-TYPE
       SYNTAX    RptrPortEntry
       ACCESS    not-accessible
       STATUS    mandatory
       DESCRIPTION
               "An entry in the table, containing information
               about a single port."
       INDEX    { rptrPortGroupIndex, rptrPortIndex }
       ::= { rptrPortTable 1 }

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

   rptrPortGroupIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)



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       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrPortEntry 1 }

   rptrPortIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information.  This
               value can never be greater than
               rptrGroupPortCapacity for the associated group."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aPortID."
       ::= { rptrPortEntry 2 }

   rptrPortAdminStatus OBJECT-TYPE
       SYNTAX    INTEGER {
                     enabled(1),
                     disabled(2)
                 }
       ACCESS    read-write
       STATUS    mandatory
       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



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               becomes enabled, the rptrPortAutoPartitionState
               becomes notAutoPartitioned(1), regardless of its
               pre-disabling state.)"
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aPortAdminState and 19.2.6.3, acPortAdminControl."
       ::= { rptrPortEntry 3 }

   rptrPortAutoPartitionState OBJECT-TYPE
       SYNTAX    INTEGER {
                     notAutoPartitioned(1),
                     autoPartitioned(2)
                 }
       ACCESS    read-only
       STATUS    mandatory
       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 Section 9
               [IEEE 802.3 Std].  They are not differentiated
               here."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aAutoPartitionState."
       ::= { rptrPortEntry 4 }

   rptrPortOperStatus  OBJECT-TYPE
       SYNTAX    INTEGER {
                     operational(1),
                     notOperational(2),
                     notPresent(3)
                 }
       ACCESS    read-only
       STATUS    mandatory
       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



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


   --
   --                    The MONITOR GROUP
   --
   -- Implementation of this group is optional, but within the
   -- group all elements are mandatory.  If a managed repeater
   -- implements any part of this group, the entire group shall
   -- be implemented.

   --
   -- Repeater Monitor Information
   --
   -- Performance monitoring statistics for the repeater
   --

   rptrMonitorTransmitCollisions OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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).

               The approximate minimum time for rollover of this
               counter is 16 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.2,
               aTransmitCollisions."
       ::= { rptrMonitorRptrInfo 1 }


   --
   -- The Group Monitor Table
   --

   rptrMonitorGroupTable OBJECT-TYPE
       SYNTAX    SEQUENCE OF RptrMonitorGroupEntry
       ACCESS    not-accessible
       STATUS    mandatory
       DESCRIPTION
               "Table of performance and error statistics for the



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               groups."
       ::= { rptrMonitorGroupInfo 1 }

   rptrMonitorGroupEntry OBJECT-TYPE
       SYNTAX    RptrMonitorGroupEntry
       ACCESS    not-accessible
       STATUS    mandatory
       DESCRIPTION
               "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."
       INDEX    { rptrMonitorGroupIndex }
       ::= { rptrMonitorGroupTable 1 }

   RptrMonitorGroupEntry ::=
       SEQUENCE {
           rptrMonitorGroupIndex
               INTEGER,
           rptrMonitorGroupTotalFrames
               Counter,
           rptrMonitorGroupTotalOctets
               Counter,
           rptrMonitorGroupTotalErrors
               Counter
       }

   rptrMonitorGroupIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the group within the
               repeater for which this entry contains
               information."
       ::= { rptrMonitorGroupEntry 1 }

   rptrMonitorGroupTotalFrames OBJECT-TYPE



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       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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.
               The approximate minimum time for rollover of this
               counter is 80 hours."
       ::= { rptrMonitorGroupEntry 2 }

   rptrMonitorGroupTotalOctets OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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."
       ::= { rptrMonitorGroupEntry 3 }

   rptrMonitorGroupTotalErrors OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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 }

   --
   -- The Port Monitor Table



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   --

   rptrMonitorPortTable OBJECT-TYPE
       SYNTAX    SEQUENCE OF RptrMonitorPortEntry
       ACCESS    not-accessible
       STATUS    mandatory
       DESCRIPTION
               "Table of performance and error statistics for the
               ports."
       ::= { rptrMonitorPortInfo 1 }

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

   RptrMonitorPortEntry ::=
       SEQUENCE {
           rptrMonitorPortGroupIndex
               INTEGER,
           rptrMonitorPortIndex
               INTEGER,
           rptrMonitorPortReadableFrames
               Counter,
           rptrMonitorPortReadableOctets
               Counter,
           rptrMonitorPortFCSErrors
               Counter,
           rptrMonitorPortAlignmentErrors
               Counter,
           rptrMonitorPortFrameTooLongs
               Counter,
           rptrMonitorPortShortEvents
               Counter,
           rptrMonitorPortRunts
               Counter,
           rptrMonitorPortCollisions
               Counter,
           rptrMonitorPortLateEvents
               Counter,
           rptrMonitorPortVeryLongEvents
               Counter,
           rptrMonitorPortDataRateMismatches



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               Counter,
           rptrMonitorPortAutoPartitions
               Counter,
           rptrMonitorPortTotalErrors
               Counter
       }

   rptrMonitorPortGroupIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrMonitorPortEntry 1 }

   rptrMonitorPortIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aPortID."
       ::= { rptrMonitorPortEntry 2 }

   rptrMonitorPortReadableFrames OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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.

               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."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,



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               aReadableFrames."
       ::= { rptrMonitorPortEntry 3 }

   rptrMonitorPortReadableOctets OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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.  The approximate minimum time
               for rollover of this counter is 58 minutes."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aReadableOctets."
       ::= { rptrMonitorPortEntry 4 }

   rptrMonitorPortFCSErrors OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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
               than or equal to minFrameSize and less than or
               equal to maxFrameSize (Ref: 4.4.2.1, IEEE 802.3
               Std).

               The approximate minimum time for rollover of this
               counter is 80 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aFrameCheckSequenceErrors."
       ::= { rptrMonitorPortEntry 5 }

   rptrMonitorPortAlignmentErrors OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory



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       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.

               The approximate minimum time for rollover of this
               counter is 80 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aAlignmentErrors."
       ::= { rptrMonitorPortEntry 6 }

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

               The approximate minimum time for rollover of this
               counter is 61 days."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aFramesTooLong."
       ::= { rptrMonitorPortEntry 7 }

   rptrMonitorPortShortEvents OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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



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               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.

               Note:  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 approximate minimum time for rollover of this
               counter is 16 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aShortEvents."
       ::= { rptrMonitorPortEntry 8 }

   rptrMonitorPortRunts OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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.



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               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.

               The approximate minimum time for rollover of this
               counter is 16 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2, aRunts."
       ::= { rptrMonitorPortEntry 9 }

   rptrMonitorPortCollisions OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This counter is incremented by one for any
               CarrierEvent signal on any port for which the
               CollisionEvent signal on this port is also
               asserted.

               The approximate minimum time for rollover of this
               counter is 16 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aCollisions."
       ::= { rptrMonitorPortEntry 10 }

   rptrMonitorPortLateEvents OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "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.  Such a CarrierEvent is
               counted twice, as both a collision and as a
               lateEvent.




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               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.

               The approximate minimum time for rollover of this
               counter is 81 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aLateEvents."
       ::= { rptrMonitorPortEntry 11 }

   rptrMonitorPortVeryLongEvents OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This counter is incremented by one for each
               CarrierEvent on this port whose ActivityDuration
               is greater than the MAU Jabber Lockup Protection
               timer TW3 (Ref: 9.6.1 & 9.6.5, IEEE 802.3 Std).
               Other counters may be incremented as appropriate."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aVeryLongEvents."
       ::= { rptrMonitorPortEntry 12 }

   rptrMonitorPortDataRateMismatches OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This counter is incremented by one for each frame
               received on this port that meets all of the
               following conditions:  a) The CollisionEvent
               signal is not asserted.  b) The ActivityDuration
               is greater than ValidPacketMinTime.  c) 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



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               to maintain data integrity is beyond the scope of
               this standard."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aDataRateMismatches."
       ::= { rptrMonitorPortEntry 13 }

   rptrMonitorPortAutoPartitions OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This counter is incremented by one for each time
               the repeater has automatically partitioned this
               port.  The conditions that cause port partitioning
               are specified in the partition state machine in
               Section 9 [IEEE 802.3 Std].  They are not
               differentiated here."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aAutoPartitions."
       ::= { rptrMonitorPortEntry 14 }

   rptrMonitorPortTotalErrors OBJECT-TYPE
       SYNTAX    Counter
       ACCESS    read-only
       STATUS    mandatory
       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, and
                   rptrMonitorPortDataRateMismatches.

               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."
       ::= { rptrMonitorPortEntry 15 }


   --
   --                    The ADDRESS TRACKING GROUP
   --
   -- Implementation of this group is optional; it is appropriate
   -- for all systems which have the necessary instrumentation.  If a
   -- managed repeater implements any part of this group, the entire
   -- group shall be implemented.

   --
   -- The Port Address Tracking Table
   --

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

   rptrAddrTrackEntry OBJECT-TYPE
       SYNTAX    RptrAddrTrackEntry
       ACCESS    not-accessible
       STATUS    mandatory
       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
               Counter,
           rptrAddrTrackNewLastSrcAddress
               OCTET STRING
       }



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   rptrAddrTrackGroupIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the group containing the
               port for which this entry contains information."
       ::= { rptrAddrTrackEntry 1 }

   rptrAddrTrackPortIndex OBJECT-TYPE
       SYNTAX    INTEGER (1..1024)
       ACCESS    read-only
       STATUS    mandatory
       DESCRIPTION
               "This object identifies the port within the group
               for which this entry contains information."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aPortID."
       ::= { rptrAddrTrackEntry 2 }

   rptrAddrTrackLastSourceAddress OBJECT-TYPE
       SYNTAX    MacAddress
       ACCESS    read-only
       STATUS    deprecated
       DESCRIPTION
               "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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aLastSourceAddress."
       ::= { rptrAddrTrackEntry 3 }

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



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

               The approximate minimum time for rollover of this
               counter is 81 hours."
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aSourceAddressChanges."
       ::= { rptrAddrTrackEntry 4 }

   rptrAddrTrackNewLastSrcAddress OBJECT-TYPE
       SYNTAX    OCTET STRING (SIZE(0 | 6))
       ACCESS    read-only
       STATUS    mandatory
       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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.6.2,
               aLastSourceAddress."
       ::= { rptrAddrTrackEntry 5 }


   -- Traps for use by Repeaters

   -- Traps are defined using the conventions in RFC 1215 [6].

   rptrHealth TRAP-TYPE
       ENTERPRISE  snmpDot3RptrMgt
       VARIABLES   { rptrOperStatus }
       DESCRIPTION
               "The rptrHealth trap conveys information related
               to the operational status of the repeater.  This
               trap is sent either when the value of
               rptrOperStatus changes, or upon completion of a
               non-disruptive test.

               The rptrHealth trap 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.



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               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
               that 'generating' a trap means sending to all
               configured recipients.)"
       REFERENCE
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.4,
               hubHealth notification."
       ::= 1

   rptrGroupChange TRAP-TYPE
       ENTERPRISE  snmpDot3RptrMgt
       VARIABLES   { rptrGroupIndex }
       DESCRIPTION
               "This trap is sent when a change occurs in the
               group structure of a 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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.4,
               groupMapChange notification."
       ::= 2

   rptrResetEvent TRAP-TYPE
       ENTERPRISE  snmpDot3RptrMgt
       VARIABLES   { rptrOperStatus }
       DESCRIPTION
               "The rptrResetEvent trap 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
               rptrReset object).



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               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
               "Reference IEEE 802.3 Rptr Mgt, 19.2.3.4, hubReset
               notification."
       ::= 3

   END


4.  Changes from RFC 1368

   (1)  Added section 2.1.4, "Internal Ports and MAUs," that defines
        internal ports and clarifies how they may or may not be
        managed.

   (2)  Noted that the failure list for rptrOperStatus is ordered
        highest priority first.

   (3)  Clarified rptrReset description to indicate that the agent
        may briefly delay the reset action.

   (4)  For rptrReset, clarified the actions that the agent should
        take after performing the reset and self-test.

   (5)  For rptrNonDisruptTest, similar change to (3).

   (6)  Clarified that the rptrNonDisruptTest description allows
        returning "ok" after doing only a trivial test.

   (7)  Deprecated rptrAddrTrackLastSourceAddress and defined a



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        replacement object that has a zero-length value until the
        first frame is seen on the port.

   (8)  Clarified that rptrHealth trap is sent after
        rptrNonDisruptTest even if repeater health information
        doesn't change as a result of the test.

   (9)  Clarified text on throttling traps.

5.  Acknowledgments

   This document is the work of the IETF Hub MIB Working Group.  It is
   based on drafts of the IEEE 802.3 Repeater Management Task Force.

6.  References

   [1]  Rose M., and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based internets", STD 16, RFC
        1155, Performance Systems International, Hughes LAN Systems, May
        1990.

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

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

   [4]  Information processing systems - Open Systems Interconnection -
        Specification of Abstract Syntax Notation One (ASN.1),
        International Organization for Standardization, International
        Standard 8824, December 1987.

   [5]  Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
        STD 16, RFC 1212, Performance Systems International, Hughes LAN
        Systems, March 1991.

   [6]  Rose, M., Editor, "A Convention for Defining Traps for use with
        the SNMP", RFC 1215, Performance Systems International, March
        1991.

   [7]  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, 2nd edition, 21 September 1990.




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   [8]  IEEE P802.3K - Layer Management for 10 Mb/s Baseband Repeaters,
        Section 19, Draft Supplement to ANSI/IEEE 802.3, Draft 8, 9
        April 1992.

7.  Security Considerations

   Security issues are not discussed in this memo.

8.  Authors' Addresses

   Donna McMaster
   SynOptics Communications, Inc.
   4401 Great America Parkway
   P.O. Box 58185
   Santa Clara, CA 95052-8185

   Phone: (408) 764-1206
   EMail: mcmaster@synoptics.com


   Keith McCloghrie
   Hughes LAN Systems, Inc.
   1225 Charleston Road
   Mountain View, CA 94043

   Phone: (415) 966-7934
   EMail: kzm@hls.com
























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