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Network Working Group                                      K. McCloghrie
Request for Comments: 1213                      Hughes LAN Systems, Inc.
Obsoletes: RFC 1158                                              M. Rose
                                       Performance Systems International
                                                                 Editors
                                                              March 1991


           Management Information Base for Network Management
                       of TCP/IP-based internets:
                                 MIB-II

Status of this Memo

   This memo defines the second version of the Management Information
   Base (MIB-II) for use with network management protocols in TCP/IP-
   based internets.  This RFC specifies an IAB standards track protocol
   for the Internet community, and requests discussion and suggestions
   for improvements.  Please refer to the current edition of the "IAB
   Official Protocol Standards" for the standardization state and status
   of this protocol.  Distribution of this memo is unlimited.

Table of Contents

   1. Abstract...............................................    2
   2. Introduction ..........................................    2
   3. Changes from RFC 1156 .................................    3
   3.1 Deprecated Objects ...................................    3
   3.2 Display Strings ......................................    4
   3.3 Physical Addresses ...................................    4
   3.4 The System Group .....................................    5
   3.5 The Interfaces Group .................................    5
   3.6 The Address Translation Group ........................    6
   3.7 The IP Group .........................................    6
   3.8 The ICMP Group .......................................    7
   3.9 The TCP Group ........................................    7
   3.10 The UDP Group .......................................    7
   3.11 The EGP Group .......................................    7
   3.12 The Transmission Group ..............................    8
   3.13 The SNMP Group ......................................    8
   3.14 Changes from RFC 1158 ................. .............    9
   4. Objects ...............................................   10
   4.1 Format of Definitions ................................   10
   5. Overview ..............................................   10
   6. Definitions ...........................................   12
   6.1 Textual Conventions ..................................   12
   6.2 Groups in MIB-II .....................................   13
   6.3 The System Group .....................................   13



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   6.4 The Interfaces Group .................................   16
   6.5 The Address Translation Group ........................   23
   6.6 The IP Group .........................................   26
   6.7 The ICMP Group .......................................   41
   6.8 The TCP Group ........................................   46
   6.9 The UDP Group ........................................   52
   6.10 The EGP Group .......................................   54
   6.11 The Transmission Group ..............................   60
   6.12 The SNMP Group ......................................   60
   7. Acknowledgements ......................................   67
   8. References ............................................   69
   9. Security Considerations ...............................   70
   10. Authors' Addresses ...................................   70

1.  Abstract

   This memo defines the second version of the Management Information
   Base (MIB-II) for use with network management protocols in TCP/IP-
   based internets.  In particular, together with its companion memos
   which describe the structure of management information (RFC 1155)
   along with the network management protocol (RFC 1157) for TCP/IP-
   based internets, these documents provide a simple, workable
   architecture and system for managing TCP/IP-based internets and in
   particular the Internet community.

2.  Introduction

   As reported in RFC 1052, IAB Recommendations for the Development of
   Internet Network Management Standards [1], a two-prong strategy for
   network management of TCP/IP-based internets was undertaken.  In the
   short-term, the Simple Network Management Protocol (SNMP) was to be
   used to manage nodes in the Internet community.  In the long-term,
   the use of the OSI network management framework was to be examined.
   Two documents were produced to define the management information: RFC
   1065, which defined the Structure of Management Information (SMI)
   [2], and RFC 1066, which defined the Management Information Base
   (MIB) [3].  Both of these documents were designed so as to be
   compatible with both the SNMP and the OSI network management
   framework.

   This strategy was quite successful in the short-term: Internet-based
   network management technology was fielded, by both the research and
   commercial communities, within a few months.  As a result of this,
   portions of the Internet community became network manageable in a
   timely fashion.

   As reported in RFC 1109, Report of the Second Ad Hoc Network
   Management Review Group [4], the requirements of the SNMP and the OSI



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   network management frameworks were more different than anticipated.
   As such, the requirement for compatibility between the SMI/MIB and
   both frameworks was suspended.  This action permitted the operational
   network management framework, the SNMP, to respond to new operational
   needs in the Internet community by producing this document.

   As such, the current network management framework for TCP/IP- based
   internets consists of: Structure and Identification of Management
   Information for TCP/IP-based internets, RFC 1155 [12], which
   describes how managed objects contained in the MIB are defined;
   Management Information Base for Network Management of TCP/IP-based
   internets: MIB-II, this memo, which describes the managed objects
   contained in the MIB (and supercedes RFC 1156 [13]); and, the Simple
   Network Management Protocol, RFC 1098 [5], which defines the protocol
   used to manage these objects.

3.  Changes from RFC 1156

   Features of this MIB include:

   (1)  incremental additions to reflect new operational
        requirements;

   (2)  upwards compatibility with the SMI/MIB and the SNMP;

   (3)  improved support for multi-protocol entities; and,

   (4)  textual clean-up of the MIB to improve clarity and
        readability.

   The objects defined in MIB-II have the OBJECT IDENTIFIER prefix:

      mib-2      OBJECT IDENTIFIER ::= { mgmt 1 }

   which is identical to the prefix used in MIB-I.

3.1.  Deprecated Objects

   In order to better prepare implementors for future changes in the
   MIB, a new term "deprecated" may be used when describing an object.
   A deprecated object in the MIB is one which must be supported, but
   one which will most likely be removed from the next version of the
   MIB (e.g., MIB-III).

   MIB-II marks one object as being deprecated:

      atTable




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   As a result of deprecating the atTable object, the entire Address
   Translation group is deprecated.

   Note that no functionality is lost with the deprecation of these
   objects: new objects providing equivalent or superior functionality
   are defined in MIB-II.

3.2.  Display Strings

   In the past, there have been misinterpretations of the MIB as to when
   a string of octets should contain printable characters, meant to be
   displayed to a human.  As a textual convention in the MIB, the
   datatype

      DisplayString ::=
          OCTET STRING

   is introduced.  A DisplayString is restricted to the NVT ASCII
   character set, as defined in pages 10-11 of [6].

   The following objects are now defined in terms of DisplayString:

      sysDescr
      ifDescr

   It should be noted that this change has no effect on either the
   syntax nor semantics of these objects.  The use of the DisplayString
   notation is merely an artifact of the explanatory method used in
   MIB-II and future MIBs.

   Further it should be noted that any object defined in terms of OCTET
   STRING may contain arbitrary binary data, in which each octet may
   take any value from 0 to 255 (decimal).

3.3.  Physical Addresses

   As a further, textual convention in the MIB, the datatype

      PhysAddress ::=
          OCTET STRING

   is introduced to represent media- or physical-level addresses.

   The following objects are now defined in terms of PhysAddress:

      ifPhysAddress
      atPhysAddress
      ipNetToMediaPhysAddress



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   It should be noted that this change has no effect on either the
   syntax nor semantics of these objects.  The use of the PhysAddress
   notation is merely an artifact of the explanatory method used in
   MIB-II and future MIBs.

3.4.  The System Group

   Four new objects are added to this group:

      sysContact
      sysName
      sysLocation
      sysServices

   These provide contact, administrative, location, and service
   information regarding the managed node.

3.5.  The Interfaces Group

   The definition of the ifNumber object was incorrect, as it required
   all interfaces to support IP.  (For example, devices without IP, such
   as MAC-layer bridges, could not be managed if this definition was
   strictly followed.)  The description of the ifNumber object is
   changed accordingly.

   The ifTable object was mistaken marked as read-write, it has been
   (correctly) re-designated as not-accessible.  In addition, several
   new values have been added to the ifType column in the ifTable
   object:

      ppp(23)
      softwareLoopback(24)
      eon(25)
      ethernet-3Mbit(26)
      nsip(27)
      slip(28)
      ultra(29)
      ds3(30)
      sip(31)
      frame-relay(32)

   Finally, a new column has been added to the ifTable object:

      ifSpecific

   which provides information about information specific to the media
   being used to realize the interface.




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3.6.  The Address Translation Group

   In MIB-I this group contained a table which permitted mappings from
   network addresses (e.g., IP addresses) to physical addresses (e.g.,
   MAC addresses).  Experience has shown that efficient implementations
   of this table make two assumptions: a single network protocol
   environment, and mappings occur only from network address to physical
   address.

   The need to support multi-protocol nodes (e.g., those with both the
   IP and CLNP active), and the need to support the inverse mapping
   (e.g., for ES-IS), have invalidated both of these assumptions.  As
   such, the atTable object is declared deprecated.

   In order to meet both the multi-protocol and inverse mapping
   requirements, MIB-II and its successors will allocate up to two
   address translation tables inside each network protocol group.  That
   is, the IP group will contain one address translation table, for
   going from IP addresses to physical addresses.  Similarly, when a
   document defining MIB objects for the CLNP is produced (e.g., [7]),
   it will contain two tables, for mappings in both directions, as this
   is required for full functionality.

   It should be noted that the choice of two tables (one for each
   direction of mapping) provides for ease of implementation in many
   cases, and does not introduce undue burden on implementations which
   realize the address translation abstraction through a single internal
   table.

3.7.  The IP Group

   The access attribute of the variable ipForwarding has been changed
   from read-only to read-write.

   In addition, there is a new column to the ipAddrTable object,

      ipAdEntReasmMaxSize

   which keeps track of the largest IP datagram that can be re-assembled
   on a particular interface.

   The descriptor of the ipRoutingTable object has been changed to
   ipRouteTable for consistency with the other IP routing objects.
   There are also three new columns in the ipRouteTable object,

      ipRouteMask
      ipRouteMetric5
      ipRouteInfo



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   the first is used for IP routing subsystems that support arbitrary
   subnet masks, and the latter two are IP routing protocol-specific.

   Two new objects are added to the IP group:

      ipNetToMediaTable
      ipRoutingDiscards

   the first is the address translation table for the IP group
   (providing identical functionality to the now deprecated atTable in
   the address translation group), and the latter provides information
   when routes are lost due to a lack of buffer space.

3.8.  The ICMP Group

   There are no changes to this group.

3.9.  The TCP Group

   Two new variables are added:

      tcpInErrs
      tcpOutRsts

   which keep track of the number of incoming TCP segments in error and
   the number of resets generated by a TCP.

3.10.  The UDP Group

   A new table:

      udpTable

   is added.

3.11.  The EGP Group

   Experience has indicated a need for additional objects that are
   useful in EGP monitoring.  In addition to making several additions to
   the egpNeighborTable object, i.e.,

      egpNeighAs
      egpNeighInMsgs
      egpNeighInErrs
      egpNeighOutMsgs
      egpNeighOutErrs
      egpNeighInErrMsgs
      egpNeighOutErrMsgs



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      egpNeighStateUps
      egpNeighStateDowns
      egpNeighIntervalHello
      egpNeighIntervalPoll
      egpNeighMode
      egpNeighEventTrigger

   a new variable is added:

      egpAs

   which gives the autonomous system associated with this EGP entity.

3.12.  The Transmission Group

   MIB-I was lacking in that it did not distinguish between different
   types of transmission media.  A new group, the Transmission group, is
   allocated for this purpose:

      transmission OBJECT IDENTIFIER ::= { mib-2 10 }

   When Internet-standard definitions for managing transmission media
   are defined, the transmission group is used to provide a prefix for
   the names of those objects.

   Typically, such definitions reside in the experimental portion of the
   MIB until they are "proven", then as a part of the Internet
   standardization process, the definitions are accordingly elevated and
   a new object identifier, under the transmission group is defined.  By
   convention, the name assigned is:

      type OBJECT IDENTIFIER ::= { transmission number }

   where "type" is the symbolic value used for the media in the ifType
   column of the ifTable object, and "number" is the actual integer
   value corresponding to the symbol.

3.13.  The SNMP Group

   The application-oriented working groups of the IETF have been tasked
   to be receptive towards defining MIB variables specific to their
   respective applications.

   For the SNMP, it is useful to have statistical information.  A new
   group, the SNMP group, is allocated for this purpose:

      snmp   OBJECT IDENTIFIER ::= { mib-2 11 }




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3.14.  Changes from RFC 1158

   Features of this MIB include:

   (1)  The managed objects in this document have been defined
        using the conventions defined in the Internet-standard
        SMI, as amended by the extensions specified in [14].  It
        must be emphasized that definitions made using these
        extensions are semantically identically to those in RFC
        1158.

   (2)  The PhysAddress textual convention has been introduced to
        represent media addresses.

   (3)  The ACCESS clause of sysLocation is now read-write.

   (4)  The definition of sysServices has been clarified.

   (5)  New ifType values (29-32) have been defined.  In
        addition, the textual-descriptor for the DS1 and E1
        interface types has been corrected.

   (6)  The definition of ipForwarding has been clarified.

   (7)  The definition of ipRouteType has been clarified.

   (8)  The ipRouteMetric5 and ipRouteInfo objects have been
        defined.

   (9)  The ACCESS clause of tcpConnState is now read-write, to
        support deletion of the TCB associated with a TCP
        connection.  The definition of this object has been
        clarified to explain this usage.

   (10) The definition of egpNeighEventTrigger has been
        clarified.

   (11) The definition of several of the variables in the new
        snmp group have been clarified.  In addition, the
        snmpInBadTypes and snmpOutReadOnlys objects are no longer
        present.  (However, the object identifiers associated
        with those objects are reserved to prevent future use.)

   (12) The definition of snmpInReadOnlys has been clarified.

   (13) The textual descriptor of the snmpEnableAuthTraps has
        been changed to snmpEnableAuthenTraps, and the definition
        has been clarified.



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   (14) The ipRoutingDiscards object was added.

   (15) The optional use of an implementation-dependent, small
        positive integer was disallowed when identifying
        instances of the IP address and routing tables.

4.  Objects

   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) [8]
   defined in the SMI.  In particular, each object has a name, a syntax,
   and an encoding.  The name is an object identifier, an
   administratively assigned name, which specifies an object type.  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 OBJECT
   DESCRIPTOR, to also refer to the object type.

   The syntax of an object type defines the abstract data structure
   corresponding to that object type.  The ASN.1 language is used for
   this purpose.  However, the SMI [12] purposely restricts the ASN.1
   constructs which may be used.  These restrictions are explicitly made
   for simplicity.

   The encoding of an object type is simply how that object type is
   represented using the object type's syntax.  Implicitly tied to the
   notion of an object type's syntax and encoding is how the object type
   is represented when being transmitted on the network.

   The SMI specifies the use of the basic encoding rules of ASN.1 [9],
   subject to the additional requirements imposed by the SNMP.

4.1.  Format of Definitions

   Section 6 contains contains the specification of all object types
   contained in this MIB module.  The object types are defined using the
   conventions defined in the SMI, as amended by the extensions
   specified in [14].

5.  Overview

   Consistent with the IAB directive to produce simple, workable systems
   in the short-term, the list of managed objects defined here, has been
   derived by taking only those elements which are considered essential.

   This approach of taking only the essential objects is NOT
   restrictive, since the SMI defined in the companion memo provides



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   three extensibility mechanisms: one, the addition of new standard
   objects through the definitions of new versions of the MIB; two, the
   addition of widely-available but non-standard objects through the
   experimental subtree; and three, the addition of private objects
   through the enterprises subtree.  Such additional objects can not
   only be used for vendor-specific elements, but also for
   experimentation as required to further the knowledge of which other
   objects are essential.

   The design of MIB-II is heavily influenced by the first extensibility
   mechanism.  Several new variables have been added based on
   operational experience and need.  Based on this, the criteria for
   including an object in MIB-II are remarkably similar to the MIB-I
   criteria:

   (1)  An object needed to be essential for either fault or
        configuration management.

   (2)  Only weak control objects were permitted (by weak, it is
        meant that tampering with them can do only limited
        damage).  This criterion reflects the fact that the
        current management protocols are not sufficiently secure
        to do more powerful control operations.

   (3)  Evidence of current use and utility was required.

   (4)  In MIB-I, an attempt was made to limit the number of
        objects to about 100 to make it easier for vendors to
        fully instrument their software.  In MIB-II, this limit
        was raised given the wide technological base now
        implementing MIB-I.

   (5)  To avoid redundant variables, it was required that no
        object be included that can be derived from others in the
        MIB.

   (6)  Implementation specific objects (e.g., for BSD UNIX) were
        excluded.

   (7)  It was agreed to avoid heavily instrumenting critical
        sections of code.  The general guideline was one counter
        per critical section per layer.

   MIB-II, like its predecessor, the Internet-standard MIB, contains
   only essential elements.  There is no need to allow individual
   objects to be optional.  Rather, the objects are arranged into the
   following groups:




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      - System
      - Interfaces
      - Address Translation (deprecated)
      - IP
      - ICMP
      - TCP
      - UDP
      - EGP
      - Transmission
      - SNMP

   These groups are the basic unit of conformance: This method is as
   follows: if the semantics of a group is applicable to an
   implementation, then it must implement all objects in that group.
   For example, an implementation must implement the EGP group if and
   only if it implements the EGP.

   There are two reasons for defining these groups: to provide a means
   of assigning object identifiers; and, to provide a method for
   implementations of managed agents to know which objects they must
   implement.

6.  Definitions

          RFC1213-MIB DEFINITIONS ::= BEGIN

          IMPORTS
                  mgmt, NetworkAddress, IpAddress, Counter, Gauge,
                          TimeTicks
                      FROM RFC1155-SMI
                  OBJECT-TYPE
                          FROM RFC-1212;

          --  This MIB module uses the extended OBJECT-TYPE macro as
          --  defined in [14];


          --  MIB-II (same prefix as MIB-I)

          mib-2      OBJECT IDENTIFIER ::= { mgmt 1 }

          -- textual conventions

          DisplayString ::=
              OCTET STRING
          -- This data type is used to model textual information taken
          -- from the NVT ASCII character set.  By convention, objects
          -- with this syntax are declared as having



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          --
          --      SIZE (0..255)

          PhysAddress ::=
              OCTET STRING
          -- This data type is used to model media addresses.  For many
          -- types of media, this will be in a binary representation.
          -- For example, an ethernet address would be represented as
          -- a string of 6 octets.


          -- groups in MIB-II

          system       OBJECT IDENTIFIER ::= { mib-2 1 }

          interfaces   OBJECT IDENTIFIER ::= { mib-2 2 }

          at           OBJECT IDENTIFIER ::= { mib-2 3 }

          ip           OBJECT IDENTIFIER ::= { mib-2 4 }

          icmp         OBJECT IDENTIFIER ::= { mib-2 5 }

          tcp          OBJECT IDENTIFIER ::= { mib-2 6 }

          udp          OBJECT IDENTIFIER ::= { mib-2 7 }

          egp          OBJECT IDENTIFIER ::= { mib-2 8 }

          -- historical (some say hysterical)
          -- cmot      OBJECT IDENTIFIER ::= { mib-2 9 }

          transmission OBJECT IDENTIFIER ::= { mib-2 10 }

          snmp         OBJECT IDENTIFIER ::= { mib-2 11 }


          The System Group

          -- Implementation of the System Group is mandatory for all
          -- systems. If an agent is not configured to have a value
          -- for any of these variables, a string of length of zero is
          -- returned.

          sysDescr OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-only
              STATUS  mandatory



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              DESCRIPTION
                      A textual description of the entity. This value
                      should include the full name and version
                      identification of the system’s hardware type,
                      operating system, and networking
                      software. Must contain printable ASCII
                      characters only.
              ::= { system 1 }

          sysObjectID OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The vendor’s authoritative identification of the
                      network management subsystem contained in the
                      entity. This value is allocated within the SMI
                      enterprises subtree (1.3.6.1.4.1) and provides a
                      means for determining “what kind of box” is
                      being managed.
              ::= { system 2 }

          sysUpTime OBJECT-TYPE
              SYNTAX  TimeTicks
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The time (in hundredths of a second) since the
                      network management portion of the system was last
                      reinitialized.
              ::= { system 3 }

          sysContact OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      The textual identification of the contact person
                      for this managed node, together with information
                      on how to contact this person.
              ::= { system 4 }

          sysName OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))



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              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      An administratively assigned name for this
                      managed node. By convention, this is the node’s
                      fully qualified domain name.
              ::= { system 5 }

          sysLocation OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      The physical location of this node (for example,                 “cubicle 2234, third floor, Building 3”).
              ::= { system 6 }

          sysServices OBJECT-TYPE
              SYNTAX  INTEGER (0..127)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      A value that indicates the services that
                      this entity offers. The value is a sum.                          This sum initially takes the value zero, then, for                 each layer, L, in the range 1 through 7, that this
                      node performs transactions for, 2 raised to
                (L - 1) is added to the sum.
              ::= { system 7 }






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          The Interfaces Group

          -- Implementation of the Interfaces Group is mandatory for
          -- all systems.

          ifNumber OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of network interfaces (regardless of
                      their current state) present on this system.
              ::= { interfaces 1 }


          -- the Interfaces Table

          -- Contains information about the entity's
          -- interfaces. Each interface is thought of as being
          -- attached to a “subnetwork.” This term should
          -- not be confused with “subnet,” which refers to an
          -- addressing partitioning scheme used in the Internet suite
          -- of protocols.

          ifTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF IfEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      A list of interface entries. The number of
                      entries is given by the value of ifNumber.
              ::= { interfaces 2 }

          ifEntry OBJECT-TYPE
              SYNTAX  IfEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      An interface entry containing objects at the
                      subnetwork layer and below for a particular
                      interface.
              INDEX   { ifIndex }
              ::= { ifTable 1 }

          IfEntry ::=
              SEQUENCE {
                  ifIndex
                      INTEGER,



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                  ifDescr
                      DisplayString,
                  ifType
                      INTEGER,
                  ifMtu
                      INTEGER,
                  ifSpeed
                      Gauge,
                  ifPhysAddress
                      PhysAddress,
                  ifAdminStatus
                      INTEGER,
                  ifOperStatus
                      INTEGER,
                  ifLastChange
                      TimeTicks,
                  ifInOctets
                      Counter,
                  ifInUcastPkts
                      Counter,
                  ifInNUcastPkts
                      Counter,
                  ifInDiscards
                      Counter,
                  ifInErrors
                      Counter,
                  ifInUnknownProtos
                      Counter,
                  ifOutOctets
                      Counter,
                  ifOutUcastPkts
                      Counter,
                  ifOutNUcastPkts
                      Counter,
                  ifOutDiscards
                      Counter,
                  ifOutErrors
                      Counter,
                  ifOutQLen
                      Gauge,
                  ifSpecific
                      OBJECT IDENTIFIER
              }

          ifIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory



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              DESCRIPTION
                      A unique value for each interface. Its value
                      ranges between 1 and the value of ifNumber. The
                      value for each interface must remain constant at
                      least from one reinitialization of the entity’s
                      network management system to the next                     reinitialization.
              ::= { ifEntry 1 }

          ifDescr OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      A textual string containing information about the
                      interface. This string should include the name of
                      the manufacturer, the product name, and the                 version of the hardware interface.
              ::= { ifEntry 2 }

          ifType OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),          -- none of the following
                          regular1822(2),
                          hdh1822(3),
                          ddn-x25(4),
                          rfc877-x25(5),
                          ethernet-csmacd(6),
                          iso88023-csmacd(7),
                          iso88024-tokenBus(8),
                          iso88025-tokenRing(9),
                          iso88026-man(10),
                          starLan(11),
                          proteon-10Mbit(12),
                          proteon-80Mbit(13),
                          hyperchannel(14),
                          fddi(15),
                          lapb(16),
                          sdlc(17),
                          ds1(18),           -- T-1
                          e1(19),            -- european equiv. of T-1
                          basicISDN(20),
                          primaryISDN(21),   -- proprietary serial
                          propPointToPointSerial(22),
                          ppp(23),
                          softwareLoopback(24),
                          eon(25),            -- CLNP over IP [11]
                          ethernet-3Mbit(26),



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                          nsip(27),           -- XNS over IP
                          slip(28),           -- generic SLIP
                          ultra(29),          -- ULTRA technologies
                          ds3(30),            -- T-3
                          sip(31),            -- SMDS
                          frame-relay(32)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The type of interface, distinguished according to
                      the physical/link protocol(s) immediately “below”
                      the network layer in the protocol stack.
              ::= { ifEntry 3 }

          ifMtu OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The size of the largest datagram that can be
                      sent/received on the interface, specified in
                      octets. For interfaces used for transmitting                 network datagrams, this is the size of the
                      largest network datagram that can be sent on
                      the interface.
              ::= { ifEntry 4 }

          ifSpeed OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      An estimate of the interface's current bandwidth
                      in bits per second. For interfaces that do not
                      vary in bandwidth or for those where no accurate
                      estimation can be made, this object should contain
                      the nominal bandwidth.
              ::= { ifEntry 5 }

          ifPhysAddress OBJECT-TYPE
              SYNTAX  PhysAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The interface’s address at the protocol layer
                      immediately “below” the network layer in the
                      protocol stack. For interfaces that do not have



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                      such an address (for example, a serial line),
                this object should contain an octet string of
                zero length.

              ::= { ifEntry 6 }

          ifAdminStatus OBJECT-TYPE
              SYNTAX  INTEGER {
                          up(1),       -- ready to pass packets
                          down(2),
                          testing(3)   -- in some test mode
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      The desired state of the interface. The
                      testing (3) state indicates that no operational
                      packets can be passed.
              ::= { ifEntry 7 }

          ifOperStatus OBJECT-TYPE
              SYNTAX  INTEGER {
                          up(1),       -- ready to pass packets
                          down(2),
                          testing(3)   -- in some test mode
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The current operational state of the interface.
                      The testing (3) state indicates that no                     operational packets can be passed.
              ::= { ifEntry 8 }

          ifLastChange OBJECT-TYPE
              SYNTAX  TimeTicks
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The value of sysUpTime at the time the interface
                      entered its current operational state. If the
                      current state was entered before the last
                      reinitialization of the local network management
                      subsystem, then this object contains a zero
                      value.
              ::= { ifEntry 9 }

          ifInOctets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only



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              STATUS  mandatory
              DESCRIPTION
                      The total number of octets received on the
                      interface, including framing characters.
              ::= { ifEntry 10 }

          ifInUcastPkts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of subnetwork-unicast packets
                      delivered to a higher-layer protocol.
              ::= { ifEntry 11 }

          ifInNUcastPkts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of non-unicast (that is, subnetwork-
                      broadcast or subnetwork-multicast) packets
                      delivered to a higher-layer protocol.
              ::= { ifEntry 12 }

          ifInDiscards OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of inbound packets chosen to be                     discarded even though no errors had been
                      detected that would prevent their being delivered                 to a higher-layer protocol. One possible reason                 for discarding such a packet could be to free up
                      buffer space.
              ::= { ifEntry 13 }


          ifInErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of inbound packets that contained
                      errors that prevented them from being delivered to                 a higher-layer protocol.
              ::= { ifEntry 14 }





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          ifInUnknownProtos OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of packets received via the interface
                      that were discarded because of an unknown or
                      unsupported protocol.
              ::= { ifEntry 15 }

          ifOutOctets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of octets transmitted out of the
                      interface, including framing characters.
              ::= { ifEntry 16 }

          ifOutUcastPkts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of packets that higher-level
                      protocols requested be transmitted to a
                      subnetwork-unicast address, including those that
                      were discarded or not sent.
              ::= { ifEntry 17 }

          ifOutNUcastPkts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of packets that higher-level
                      protocols requested be transmitted to a non-
                      unicast (that is, a subnetwork-broadcast or
                      subnetwork-multicast) address, including those
                      that were discarded or not sent.
              ::= { ifEntry 18 }

          ifOutDiscards OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of outbound packets that were chosen



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                      to be discarded even though no errors had been
                      detected to prevent their being transmitted. One
                      possible reason for discarding such a packet could
                      be to free up buffer space.
              ::= { ifEntry 19 }

          ifOutErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The number of outbound packets that could not be
                      transmitted because of errors.
              ::= { ifEntry 20 }

          ifOutQLen OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The length of the output packet queue (in                     packets).
               ::= { ifEntry 21 }

          ifSpecific OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      A reference to MIB definitions specific to the
                      particular media being used as the interface.
                      For example, if the interface is an Ethernet
                      card, then the value of this object refers
                      to a document defining objects specific to
                      Ethernet.
              ::= { ifEntry 22 }


          -- The Address Translation group

          -- Implementation of the Address Translation group is
          -- mandatory for all systems.  Note, however, that this group
          -- is deprecated by MIB-II. That is, it is being included



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          -- solely for compatibility with MIB-I nodes, and will most
          -- likely be excluded from MIB-III nodes.  From MIB-II and
          -- onwards, each network protocol group contains its own
          -- address translation tables.

          -- The Address Translation group contains one table which is
          -- the union across all interfaces of the translation tables
          -- for converting a NetworkAddress (e.g., an IP address) into
          -- a subnetwork-specific address.  For lack of a better term,
          -- this document refers to such a subnetwork-specific address
          -- as a ‘physical’ address.

          -- Examples of such translation tables are: for broadcast
          -- media where ARP is in use, the translation table is
          -- equivalent to the ARP cache; or, on an X.25 network where
          -- non-algorithmic translation to X.121 addresses is
          -- required, the translation table contains the
          -- NetworkAddress to X.121 address equivalences.

          atTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF AtEntry
              ACCESS  not-accessible
              STATUS  deprecated
              DESCRIPTION
                      "The Address Translation tables contain the
                      NetworkAddress to ‘physical’address equivalences.
                      Some interfaces do not use translation tables for
                      determining address equivalences (e.g., DDN-X.25
                      has an algorithmic method); if all interfaces are
                      of this type, then the Address Translation table
                      is empty, i.e., has zero entries."
              ::= { at 1 }

          atEntry OBJECT-TYPE
              SYNTAX  AtEntry
              ACCESS  not-accessible
              STATUS  deprecated
              DESCRIPTION
                       "Each entry contains one NetworkAddress to
                      ‘physical’ address equivalence."
              INDEX   { atIfIndex,
                        atNetAddress }
              ::= { atTable 1 }

          AtEntry ::=
              SEQUENCE {
                  atIfIndex
                      INTEGER,



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RFC 1213                         MIB-II                       March 1991


                  atPhysAddress
                      PhysAddress,
                  atNetAddress
                      NetworkAddress
              }

          atIfIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  deprecated
              DESCRIPTION
                      "The interface on which this entry's equivalence
                      is effective.  The interface identified by a
                      particular value of this index is the same
                      interface as identified by the same value of
                      ifIndex."
              ::= { atEntry 1 }

          atPhysAddress OBJECT-TYPE
              SYNTAX  PhysAddress
              ACCESS  read-write
              STATUS  deprecated
              DESCRIPTION
                      "The media-dependent “physical” address.

                      Setting this object to a null string (one of zero
                      length) has the effect of invaliding the
                      corresponding entry in the atTable object.  That
                      is, it effectively dissasociates the interface
                      identified with said entry from the mapping
                      identified with said entry.  It is an
                      implementation-specific matter as to whether the
                      agent removes an invalidated entry from the table.
                      Accordingly, management stations must be prepared
                      to receive tabular information from agents that
                      corresponds to entries not currently in use.
                      Proper interpretation of such entries requires
                      examination of the relevant atPhysAddress object."
              ::= { atEntry 2 }

          atNetAddress OBJECT-TYPE
              SYNTAX  NetworkAddress
              ACCESS  read-write
              STATUS  deprecated
              DESCRIPTION
                      "The NetworkAddress (e.g., the IP address)
                      corresponding to the media-dependent ‘physical’
                      address."

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              ::= { atEntry 3 }


          -- The IP Group

          -- Implementation of the IP group is mandatory for all
          -- systems.

          ipForwarding OBJECT-TYPE
              SYNTAX  INTEGER {
                          forwarding(1),    -- acting as a gateway
                          not-forwarding(2) -- NOT acting as a gateway
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The indication of whether this entity is acting
                      as an IP gateway in respect to the forwarding of
                      datagrams received by, but not addressed to, this
                      entity.  IP gateways forward datagrams.  IP hosts
                      do not (except those source-routed via the host).

                      Note that for some managed nodes, this object may
                      take on only a subset of the values possible.
                      Accordingly, it is appropriate for an agent to
                      return a “badValue” response if a management
                      station attempts to change this object to an
                      inappropriate value."
              ::= { ip 1 }

          ipDefaultTTL OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      The default value inserted into the Time-To-Live
                      field of the IP header of datagrams originated at
                      this entity, whenever a TTL value is not supplied
                      by the transport layer protocol.
              ::= { ip 2 }

          ipInReceives OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of input datagrams received from
                      interfaces, including those received in error."



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              ::= { ip 3 }

          ipInHdrErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of input datagrams discarded due to
                      errors in their IP headers, including bad
                      checksums, version number mismatch, other format
                      errors, time-to-live exceeded, errors discovered
                      in processing their IP options, etc."
              ::= { ip 4 }

          ipInAddrErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of input datagrams discarded because
                      the IP address in their IP header's destination
                      field was not a valid address to be received at
                      this entity.  This count includes invalid
                      addresses (e.g., 0.0.0.0) and addresses of
                      unsupported Classes (e.g., Class E).  For entities
                      which are not IP Gateways and therefore do not
                      forward datagrams, this counter includes datagrams
                      discarded because the destination address was not
                      a local address."
              ::= { ip 5 }

          ipForwDatagrams OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of input datagrams for which this
                      entity was not their final IP destination, as a
                      result of which an attempt was made to find a
                      route to forward them to that final destination.
                      In entities which do not act as IP Gateways, this
                      counter will include only those packets which were
                      Source-Routed via this entity, and the Source-
                      Route option processing was successful."
              ::= { ip 6 }

          ipInUnknownProtos OBJECT-TYPE
              SYNTAX  Counter



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              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of locally-addressed datagrams
                      received successfully but discarded because of an
                      unknown or unsupported protocol."
              ::= { ip 7 }

          ipInDiscards OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of input IP datagrams for which no
                      problems were encountered to prevent their
                      continued processing, but which were discarded
                      (e.g., for lack of buffer space).  Note that this
                      counter does not include any datagrams discarded
                      while awaiting re-assembly."
              ::= { ip 8 }

          ipInDelivers OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of input datagrams successfully
                      delivered to IP user-protocols (including ICMP)."
              ::= { ip 9 }

          ipOutRequests OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of IP datagrams which local IP
                      user-protocols (including ICMP) supplied to IP in
                      requests for transmission.  Note that this counter
                      does not include any datagrams counted in
                      ipForwDatagrams."
              ::= { ip 10 }

          ipOutDiscards OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of output IP datagrams for which no



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                      problem was encountered to prevent their
                      transmission to their destination, but which were
                      discarded (e.g., for lack of buffer space).  Note
                      that this counter would include datagrams counted
                      in ipForwDatagrams if any such packets met this
                      (discretionary) discard criterion."             ::= { ip 11 }

          ipOutNoRoutes OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP datagrams discarded because no
                      route could be found to transmit them to their
                      destination.  Note that this counter includes any
                      packets counted in ipForwDatagrams which meet this
                      `no-route' criterion.  Note that this includes any
                      datagarms which a host cannot route because all of
                      its default gateways are down."
              ::= { ip 12 }

          ipReasmTimeout OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The maximum number of seconds which received
                      fragments are held while they are awaiting
                      reassembly at this entity."
              ::= { ip 13 }

          ipReasmReqds OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP fragments received which needed
                      to be reassembled at this entity."
              ::= { ip 14 }

          ipReasmOKs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP datagrams successfully re-
                      assembled."



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              ::= { ip 15 }

          ipReasmFails OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of failures detected by the IP re-
                      assembly algorithm (for whatever reason: timed
                      out, errors, etc).  Note that this is not
                      necessarily a count of discarded IP fragments
                      since some algorithms (notably the algorithm in
                      RFC 815) can lose track of the number of fragments
                      by combining them as they are received."
              ::= { ip 16 }

          ipFragOKs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP datagrams that have been
                      successfully fragmented at this entity."              ::= { ip 17 }

          ipFragFails OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP datagrams that have been
                      discarded because they needed to be fragmented at
                      this entity but could not be, e.g., because their
                      Don't Fragment flag was set."
              ::= { ip 18 }

          ipFragCreates OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of IP datagram fragments that have
                      been generated as a result of fragmentation at
                      this entity."
              ::= { ip 19 }






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RFC 1213                         MIB-II                       March 1991


          -- The IP Address Table

          -- The IP Address Table contains this entity's IP addressing
          -- information.

          ipAddrTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF IpAddrEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "The table of addressing information relevant to
                      this entity's IP addresses."
              ::= { ip 20 }

          ipAddrEntry OBJECT-TYPE
              SYNTAX  IpAddrEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                     "The addressing information for one of this
                      entity's IP addresses."
              INDEX   { ipAdEntAddr }
              ::= { ipAddrTable 1 }

          IpAddrEntry ::=
              SEQUENCE {
                  ipAdEntAddr
                      IpAddress,
                  ipAdEntIfIndex
                      INTEGER,
                  ipAdEntNetMask
                      IpAddress,
                  ipAdEntBcastAddr
                      INTEGER,
                  ipAdEntReasmMaxSize
                      INTEGER (0..65535)
              }

          ipAdEntAddr OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The IP address to which this entry's addressing
                      information pertains."
              ::= { ipAddrEntry 1 }





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          ipAdEntIfIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The index value which uniquely identifies the
                      interface to which this entry is applicable.  The
                      interface identified by a particular value of this
                      index is the same interface as identified by the
                      same value of ifIndex."
              ::= { ipAddrEntry 2 }

          ipAdEntNetMask OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The subnet mask associated with the IP address of
                      this entry.  The value of the mask is an IP
                      address with all the network bits set to 1 and all
                      the hosts bits set to 0."
              ::= { ipAddrEntry 3 }

          ipAdEntBcastAddr OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of the least-significant bit in the IP
                      broadcast address used for sending datagrams on
                      the (logical) interface associated with the IP
                      address of this entry.  For example, when the
                      Internet standard all-ones broadcast address is
                      used, the value will be 1.  This value applies to
                      both the subnet and network broadcasts addresses
                      used by the entity on this (logical) interface."              ::= { ipAddrEntry 4 }

          ipAdEntReasmMaxSize OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The size of the largest IP datagram which this
                      entity can re-assemble from incoming IP fragmented
                      datagrams received on this interface."
              ::= { ipAddrEntry 5 }




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          -- The IP Routing Table

          -- The IP Routing Table contains an entry for each route
          -- presently known to this entity.

          ipRouteTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF IpRouteEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                     "This entity's IP routing table."
              ::= { ip 21 }

          ipRouteEntry OBJECT-TYPE
              SYNTAX  IpRouteEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                       "A route to a particular destination."
              INDEX   { ipRouteDest }
              ::= { ipRouteTable 1 }

          IpRouteEntry ::=
              SEQUENCE {
                  ipRouteDest
                      IpAddress,
                  ipRouteIfIndex
                      INTEGER,
                  ipRouteMetric1
                      INTEGER,
                  ipRouteMetric2
                      INTEGER,
                  ipRouteMetric3
                      INTEGER,
                  ipRouteMetric4
                      INTEGER,
                  ipRouteNextHop
                      IpAddress,
                  ipRouteType
                      INTEGER,
                  ipRouteProto
                      INTEGER,
                  ipRouteAge
                      INTEGER,
                  ipRouteMask
                      IpAddress,
                  ipRouteMetric5
                      INTEGER,



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RFC 1213                         MIB-II                       March 1991


                  ipRouteInfo
                      OBJECT IDENTIFIER
              }

          ipRouteDest OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The destination IP address of this route.  An
                      entry with a value of 0.0.0.0 is considered a
                      default route.  Multiple routes to a single
                      destination can appear in the table, but access to
                      such multiple entries is dependent on the table-
                      access mechanisms defined by the network
                      management protocol in use."
              ::= { ipRouteEntry 1 }

          ipRouteIfIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The index value which uniquely identifies the
                      local interface through which the next hop of this
                      route should be reached.  The interface identified
                      by a particular value of this index is the same
                      interface as identified by the same value of
                      ifIndex."
              ::= { ipRouteEntry 2 }

          ipRouteMetric1 OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The primary routing metric for this route.  The
                      semantics of this metric are determined by the
                      routing-protocol specified in the route's
                      ipRouteProto value.  If this metric is not used,
                      its value should be set to -1."
              ::= { ipRouteEntry 3 }

          ipRouteMetric2 OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION



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                      "An alternate routing metric for this route.  The
                      semantics of this metric are determined by the
                      routing-protocol specified in the route's
                      ipRouteProto value.  If this metric is not used,
                      its value should be set to -1."
              ::= { ipRouteEntry 4 }

          ipRouteMetric3 OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "An alternate routing metric for this route.  The
                      semantics of this metric are determined by the
                      routing-protocol specified in the route's
                      ipRouteProto value.  If this metric is not used,
                      its value should be set to -1."
              ::= { ipRouteEntry 5 }

          ipRouteMetric4 OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "An alternate routing metric for this route.  The
                      semantics of this metric are determined by the
                      routing-protocol specified in the route's
                      ipRouteProto value.  If this metric is not used,
                      its value should be set to -1."
              ::= { ipRouteEntry 6 }

          ipRouteNextHop OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The IP address of the next hop of this route.
                      (In the case of a route bound to an interface
                      which is realized via a broadcast media, the value
                      of this field is the agent's IP address on that
                      interface.)"
              ::= { ipRouteEntry 7 }

          ipRouteType OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),        -- none of the following

                          invalid(2),      -- an invalidated route



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                                           -- route to directly
                          direct(3),       -- connected (sub-)network

                                           -- route to a non-local
                          indirect(4)      -- host/network/sub-network
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The type of route.  Note that the values
                      direct(3) and indirect(4) refer to the notion of
                      direct and indirect routing in the IP
                      architecture.

                      Setting this object to the value invalid(2) has
                      the effect of invalidating the corresponding entry
                      in the ipRouteTable object.  That is, it
                      effectively dissasociates the destination
                      identified with said entry from the route
                      identified with said entry.  It is an
                      implementation-specific matter as to whether the
                      agent removes an invalidated entry from the table.
                      Accordingly, management stations must be prepared
                      to receive tabular information from agents that
                      corresponds to entries not currently in use.
                      Proper interpretation of such entries requires
                      examination of the relevant ipRouteType object."
              ::= { ipRouteEntry 8 }

          ipRouteProto OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),       -- none of the following

                                          -- non-protocol information,
                                          -- e.g., manually configured
                          local(2),       -- entries

                                          -- set via a network
                          netmgmt(3),     -- management protocol

                                          -- obtained via ICMP,
                          icmp(4),        -- e.g., Redirect

                                          -- the remaining values are
                                          -- all gateway routing
                                          -- protocols
                          egp(5),
                          ggp(6),



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                          hello(7),
                          rip(8),
                          is-is(9),
                          es-is(10),
                          ciscoIgrp(11),
                          bbnSpfIgp(12),
                          ospf(13),
                          bgp(14)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The routing mechanism via which this route was
                      learned.  Inclusion of values for gateway routing
                      protocols is not intended to imply that hosts
                      should support those protocols."
              ::= { ipRouteEntry 9 }

          ipRouteAge OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The number of seconds since this route was last
                      updated or otherwise determined to be correct.
                      Note that no semantics of “too old” can be implied
                      except through knowledge of the routing protocol
                      by which the route was learned."
              ::= { ipRouteEntry 10 }

          ipRouteMask OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Indicate the mask to be logical-ANDed with the
                      destination address before being compared to the
                      value in the ipRouteDest field.  For those systems
                      that do not support arbitrary subnet masks, an
                      agent constructs the value of the ipRouteMask by
                      determining whether the value of the correspondent
                      ipRouteDest field belong to a class-A, B, or C
                      network, and then using one of:

                           mask           network
                           255.0.0.0      class-A
                           255.255.0.0    class-B
                           255.255.255.0  class-C



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                      If the value of the ipRouteDest is 0.0.0.0 (a
                      default route), then the mask value is also
                      0.0.0.0.  It should be noted that all IP routing
                      subsystems implicitly use this mechanism."
              ::= { ipRouteEntry 11 }

          ipRouteMetric5 OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "An alternate routing metric for this route.  The
                      semantics of this metric are determined by the
                      routing-protocol specified in the route's
                      ipRouteProto value.  If this metric is not used,
                      its value should be set to -1."
              ::= { ipRouteEntry 12 }

          ipRouteInfo OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "A reference to MIB definitions specific to the
                      particular routing protocol which is responsible
                      for this route, as determined by the value
                      specified in the route's ipRouteProto value.  If
                      this information is not present, its value should
                      be set to the OBJECT IDENTIFIER { 0 0 }, which is
                      a syntatically valid object identifier, and any
                      conformant implementation of ASN.1 and BER must be
                      able to generate and recognize this value."
              ::= { ipRouteEntry 13 }


          -- the IP Address Translation Table

          -- The IP Address Translation Table contains the IpAddress to
          -- ‘physical’ address equivalences.  Some interfaces do not
          -- use translation tables for determining address
          -- equivalences (e.g., DDN-X.25 has an algorithmic method);
          -- if all interfaces are of this type, then the Address
          -- Translation table is empty, i.e., has zero entries.

          ipNetToMediaTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF IpNetToMediaEntry
              ACCESS  not-accessible
              STATUS  mandatory



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              DESCRIPTION
                      "The IP Address Translation table used for mapping
                      from IP addresses to physical addresses."
              ::= { ip 22 }

          ipNetToMediaEntry OBJECT-TYPE
              SYNTAX  IpNetToMediaEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Each entry contains one IpAddress to ‘physical’                                     address equivalence."
              INDEX   { ipNetToMediaIfIndex,
                        ipNetToMediaNetAddress }
              ::= { ipNetToMediaTable 1 }

          IpNetToMediaEntry ::=
              SEQUENCE {
                  ipNetToMediaIfIndex
                      INTEGER,
                  ipNetToMediaPhysAddress
                      PhysAddress,
                  ipNetToMediaNetAddress
                      IpAddress,
                  ipNetToMediaType
                      INTEGER
              }

          ipNetToMediaIfIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The interface on which this entry's equivalence
                      is effective.  The interface identified by a
                      particular value of this index is the same
                      interface as identified by the same value of
                      ifIndex."
              ::= { ipNetToMediaEntry 1 }

          ipNetToMediaPhysAddress OBJECT-TYPE
              SYNTAX  PhysAddress
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The media-dependent `physical' address."
              ::= { ipNetToMediaEntry 2 }




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          ipNetToMediaNetAddress OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The IpAddress corresponding to the media-
                      dependent `physical' address."
              ::= { ipNetToMediaEntry 3 }

          ipNetToMediaType OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),        -- none of the following
                          invalid(2),      -- an invalidated mapping
                          dynamic(3),
                          static(4)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The type of mapping.

                      Setting this object to the value invalid(2) has
                      the effect of invalidating the corresponding entry
                      in the ipNetToMediaTable.  That is, it effectively
                      dissasociates the interface identified with said
                      entry from the mapping identified with said entry.
                      It is an implementation-specific matter as to
                      whether the agent removes an invalidated entry
                      from the table.  Accordingly, management stations
                      must be prepared to receive tabular information
                      from agents that corresponds to entries not
                      currently in use.  Proper interpretation of such
                      entries requires examination of the relevant
                      ipNetToMediaType object."
              ::= { ipNetToMediaEntry 4 }


          -- additional IP objects

          ipRoutingDiscards OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of routing entries which were chosen
                      to be discarded even though they are valid.  One
                      possible reason for discarding such an entry could
                      be to free-up buffer space for other routing



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                      entries."
              ::= { ip 23 }


          -- The ICMP Group

          -- Implementation of the ICMP group is mandatory for all
          -- systems.

          icmpInMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of ICMP messages which the
                      entity received.  Note that this counter includes
                      all those counted by icmpInErrors."              ::= { icmp 1 }

          icmpInErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP messages which the entity
                      received but determined as having ICMP-specific
                      errors (bad ICMP checksums, bad length, etc.)."
              ::= { icmp 2 }

          icmpInDestUnreachs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Destination Unreachable
                      messages received."
              ::= { icmp 3 }

          icmpInTimeExcds OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Time Exceeded messages
                      received."
              ::= { icmp 4 }





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          icmpInParmProbs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Parameter Problem messages
                      received."
              ::= { icmp 5 }

          icmpInSrcQuenchs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Source Quench messages
                      received."
              ::= { icmp 6 }

          icmpInRedirects OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Redirect messages received."
              ::= { icmp 7 }

          icmpInEchos OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Echo (request) messages
                      received."
              ::= { icmp 8 }

          icmpInEchoReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Echo Reply messages received."
              ::= { icmp 9 }

          icmpInTimestamps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION



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                      "The number of ICMP Timestamp (request) messages
                      received."
              ::= { icmp 10 }

          icmpInTimestampReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Timestamp Reply messages
                      received."
              ::= { icmp 11 }

          icmpInAddrMasks OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Address Mask Request messages
                      received."
              ::= { icmp 12 }

          icmpInAddrMaskReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Address Mask Reply messages
                      received."
              ::= { icmp 13 }

          icmpOutMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of ICMP messages which this
                      entity attempted to send.  Note that this counter
                      includes all those counted by icmpOutErrors."
              ::= { icmp 14 }

          icmpOutErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP messages which this entity did
                      not send due to problems discovered within ICMP



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                      such as a lack of buffers.  This value should not
                      include errors discovered outside the ICMP layer
                      such as the inability of IP to route the resultant
                      datagram.  In some implementations there may be no
                      types of error which contribute to this counter's
                      value."
              ::= { icmp 15 }

          icmpOutDestUnreachs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Destination Unreachable
                      messages sent."
              ::= { icmp 16 }

          icmpOutTimeExcds OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Time Exceeded messages sent."
              ::= { icmp 17 }

          icmpOutParmProbs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Parameter Problem messages
                      sent."
              ::= { icmp 18 }

          icmpOutSrcQuenchs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Source Quench messages sent."
              ::= { icmp 19 }

          icmpOutRedirects OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Redirect messages sent.  For a



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                      host, this object will always be zero, since hosts
                      do not send redirects."
              ::= { icmp 20 }

          icmpOutEchos OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Echo (request) messages sent."
              ::= { icmp 21 }

          icmpOutEchoReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Echo Reply messages sent."
              ::= { icmp 22 }

          icmpOutTimestamps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Timestamp (request) messages
                      sent."
              ::= { icmp 23 }

          icmpOutTimestampReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Timestamp Reply messages
                      sent."
              ::= { icmp 24 }

          icmpOutAddrMasks OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Address Mask Request messages
                      sent."
              ::= { icmp 25 }





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          icmpOutAddrMaskReps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of ICMP Address Mask Reply messages
                      sent."
              ::= { icmp 26 }


          -- the TCP group

          -- Implementation of the TCP group is mandatory for all
          -- systems that implement the TCP.

          -- Note that instances of object types that represent
          -- information about a particular TCP connection are
          -- transient; they persist only as long as the connection
          -- in question.

          tcpRtoAlgorithm OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),    -- none of the following

                          constant(2), -- a constant rto
                          rsre(3),     -- MIL-STD-1778, Appendix B
                          vanj(4)      -- Van Jacobson's algorithm [10]
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The algorithm used to determine the timeout value
                      used for retransmitting unacknowledged octets."
              ::= { tcp 1 }

          tcpRtoMin OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The minimum value permitted by a TCP
                      implementation for the retransmission timeout,
                      measured in milliseconds.  More refined semantics
                      for objects of this type depend upon the algorithm
                      used to determine the retransmission timeout.  In
                      particular, when the timeout algorithm is rsre(3),
                      an object of this type has the semantics of the
                      LBOUND quantity described in RFC 793."



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              ::= { tcp 2 }


          tcpRtoMax OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The maximum value permitted by a TCP
                      implementation for the retransmission timeout,
                      measured in milliseconds.  More refined semantics
                      for objects of this type depend upon the algorithm
                      used to determine the retransmission timeout.  In
                      particular, when the timeout algorithm is rsre(3),
                      an object of this type has the semantics of the
                      UBOUND quantity described in RFC 793."
              ::= { tcp 3 }

          tcpMaxConn OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The limit on the total number of TCP connections
                      the entity can support.  In entities where the
                      maximum number of connections is dynamic, this
                      object should contain the value -1."
              ::= { tcp 4 }

          tcpActiveOpens OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times TCP connections have made a
                      direct transition to the SYN-SENT state from the
                      CLOSED state."
              ::= { tcp 5 }

          tcpPassiveOpens OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times TCP connections have made a
                      direct transition to the SYN-RCVD state from the
                      LISTEN state."
              ::= { tcp 6 }



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          tcpAttemptFails OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times TCP connections have made a
                      direct transition to the CLOSED state from either
                      the SYN-SENT state or the SYN-RCVD state, plus the
                      number of times TCP connections have made a direct
                      transition to the LISTEN state from the SYN-RCVD
                      state."
              ::= { tcp 7 }

          tcpEstabResets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times TCP connections have made a
                      direct transition to the CLOSED state from either
                      the ESTABLISHED state or the CLOSE-WAIT state."
              ::= { tcp 8 }

          tcpCurrEstab OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of TCP connections for which the
                      current state is either ESTABLISHED or CLOSE-
                      WAIT."
              ::= { tcp 9 }

          tcpInSegs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of segments received, including
                      those received in error.  This count includes
                      segments received on currently established
                      connections."
              ::= { tcp 10 }

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



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              DESCRIPTION
                      "The total number of segments sent, including
                      those on current connections but excluding those
                      containing only retransmitted octets."
              ::= { tcp 11 }

          tcpRetransSegs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of segments retransmitted - that
                      is, the number of TCP segments transmitted
                      containing one or more previously transmitted
                      octets."
              ::= { tcp 12 }


          -- the TCP Connection table

          -- The TCP connection table contains information about this
          -- entity's existing TCP connections.

          tcpConnTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF TcpConnEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "A table containing TCP connection-specific
                      information."
              ::= { tcp 13 }

          tcpConnEntry OBJECT-TYPE
              SYNTAX  TcpConnEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Information about a particular current TCP
                      connection.  An object of this type is transient,
                      in that it ceases to exist when (or soon after)
                      the connection makes the transition to the CLOSED
                      state."
              INDEX   { tcpConnLocalAddress,
                        tcpConnLocalPort,
                        tcpConnRemAddress,
                        tcpConnRemPort }
              ::= { tcpConnTable 1 }




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          TcpConnEntry ::=
              SEQUENCE {
                  tcpConnState
                      INTEGER,
                  tcpConnLocalAddress
                      IpAddress,
                  tcpConnLocalPort
                      INTEGER (0..65535),
                  tcpConnRemAddress
                      IpAddress,
                  tcpConnRemPort
                      INTEGER (0..65535)
              }

          tcpConnState OBJECT-TYPE
              SYNTAX  INTEGER {
                          closed(1),
                          listen(2),
                          synSent(3),
                          synReceived(4),
                          established(5),
                          finWait1(6),
                          finWait2(7),
                          closeWait(8),
                          lastAck(9),
                          closing(10),
                          timeWait(11),
                          deleteTCB(12)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The state of this TCP connection.

                      The only value which may be set by a management
                      station is deleteTCB(12).  Accordingly, it is
                      appropriate for an agent to return a `badValue'
                      response if a management station attempts to set
                      this object to any other value.

                      If a management station sets this object to the
                      value deleteTCB(12), then this has the effect of
                      deleting the TCB (as defined in RFC 793) of the
                      corresponding connection on the managed node,
                      resulting in immediate termination of the
                      connection.

                      As an implementation-specific option, a RST



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                      segment may be sent from the managed node to the
                      other TCP endpoint (note however that RST segments
                      are not sent reliably)."
              ::= { tcpConnEntry 1 }

          tcpConnLocalAddress OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The local IP address for this TCP connection.  In
                      the case of a connection in the listen state which
                      is willing to accept connections for any IP
                      interface associated with the node, the value
                      0.0.0.0 is used."
              ::= { tcpConnEntry 2 }

          tcpConnLocalPort OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The local port number for this TCP connection."
              ::= { tcpConnEntry 3 }

          tcpConnRemAddress OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The remote IP address for this TCP connection."
              ::= { tcpConnEntry 4 }

          tcpConnRemPort OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The remote port number for this TCP connection."
              ::= { tcpConnEntry 5 }


          -- additional TCP objects

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



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              DESCRIPTION
                      "The total number of segments received in error
                      (e.g., bad TCP checksums)."
              ::= { tcp 14 }

          tcpOutRsts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of TCP segments sent containing the
                      RST flag."
              ::= { tcp 15 }


          -- The UDP group

          -- Implementation of the UDP group is mandatory for all
          -- systems which implement the UDP.

          udpInDatagrams OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of UDP datagrams delivered to
                      UDP users."
              ::= { udp 1 }

          udpNoPorts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of received UDP datagrams for
                      which there was no application at the destination
                      port."
              ::= { udp 2 }

          udpInErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of received UDP datagrams that could
                      not be delivered for reasons other than the lack
                      of an application at the destination port."
              ::= { udp 3 }



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          udpOutDatagrams OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of UDP datagrams sent from this
                      entity."
              ::= { udp 4 }


          -- the UDP Listener table

          -- The UDP listener table contains information about this
          -- entity's UDP end-points on which a local application is
          -- currently accepting datagrams.

          udpTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF UdpEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "A table containing UDP listener information."
              ::= { udp 5 }

          udpEntry OBJECT-TYPE
              SYNTAX  UdpEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Information about a particular current UDP
                      listener."
              INDEX   { udpLocalAddress, udpLocalPort }
              ::= { udpTable 1 }

          UdpEntry ::=
              SEQUENCE {
                  udpLocalAddress
                      IpAddress,
                  udpLocalPort
                      INTEGER (0..65535)
              }

          udpLocalAddress OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The local IP address for this UDP listener.  In



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                      the case of a UDP listener which is willing to
                      accept datagrams for any IP interface associated
                      with the node, the value 0.0.0.0 is used."
              ::= { udpEntry 1 }

          udpLocalPort OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The local port number for this UDP listener."
              ::= { udpEntry 2 }


          -- the EGP group

          -- Implementation of the EGP group is mandatory for all
          -- systems which implement the EGP.

          egpInMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP messages received without
                      error."
              ::= { egp 1 }

          egpInErrors OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP messages received that proved
                      to be in error."
              ::= { egp 2 }

          egpOutMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The total number of locally generated EGP
                      messages."
              ::= { egp 3 }

          egpOutErrors OBJECT-TYPE
              SYNTAX  Counter



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              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of locally generated EGP messages not
                      sent due to resource limitations within an EGP
                      entity."
              ::= { egp 4 }


          -- the EGP Neighbor table

          -- The EGP neighbor table contains information about this
          -- entity's EGP neighbors.

          egpNeighTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF EgpNeighEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "The EGP neighbor table."
              ::= { egp 5 }

          egpNeighEntry OBJECT-TYPE
              SYNTAX  EgpNeighEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Information about this entity's relationship with
                      a particular EGP neighbor."
              INDEX   { egpNeighAddr }
              ::= { egpNeighTable 1 }

          EgpNeighEntry ::=
              SEQUENCE {
                  egpNeighState
                      INTEGER,
                  egpNeighAddr
                      IpAddress,
                  egpNeighAs
                      INTEGER,
                  egpNeighInMsgs
                      Counter,
                  egpNeighInErrs
                      Counter,
                  egpNeighOutMsgs
                      Counter,
                  egpNeighOutErrs
                      Counter,



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                  egpNeighInErrMsgs
                      Counter,
                  egpNeighOutErrMsgs
                      Counter,
                  egpNeighStateUps
                      Counter,
                  egpNeighStateDowns
                      Counter,
                  egpNeighIntervalHello
                      INTEGER,
                  egpNeighIntervalPoll
                      INTEGER,
                  egpNeighMode
                      INTEGER,
                  egpNeighEventTrigger
                      INTEGER
              }

          egpNeighState OBJECT-TYPE
              SYNTAX  INTEGER {
                          idle(1),
                          acquisition(2),
                          down(3),
                          up(4),
                          cease(5)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The EGP state of the local system with respect to
                      this entry's EGP neighbor.  Each EGP state is
                      represented by a value that is one greater than
                      the numerical value associated with said state in
                      RFC 904."
              ::= { egpNeighEntry 1 }

          egpNeighAddr OBJECT-TYPE
              SYNTAX  IpAddress
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The IP address of this entry's EGP neighbor."
              ::= { egpNeighEntry 2 }

          egpNeighAs OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory



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              DESCRIPTION
                      "The autonomous system of this EGP peer.  Zero
                      should be specified if the autonomous system
                      number of the neighbor is not yet known."
              ::= { egpNeighEntry 3 }

          egpNeighInMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP messages received without error
                      from this EGP peer."
              ::= { egpNeighEntry 4 }

          egpNeighInErrs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP messages received from this EGP
                      peer that proved to be in error (e.g., bad EGP
                      checksum)."
              ::= { egpNeighEntry 5 }

          egpNeighOutMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of locally generated EGP messages to
                      this EGP peer."
              ::= { egpNeighEntry 6 }

          egpNeighOutErrs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of locally generated EGP messages not
                      sent to this EGP peer due to resource limitations
                      within an EGP entity."
              ::= { egpNeighEntry 7 }

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



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              DESCRIPTION
                      "The number of EGP-defined error messages received
                      from this EGP peer."
              ::= { egpNeighEntry 8 }

          egpNeighOutErrMsgs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP-defined error messages sent to
                      this EGP peer."
              ::= { egpNeighEntry 9 }

          egpNeighStateUps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP state transitions to the UP
                      state with this EGP peer."
              ::= { egpNeighEntry 10 }

          egpNeighStateDowns OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of EGP state transitions from the UP
                      state to any other state with this EGP peer."
              ::= { egpNeighEntry 11 }

          egpNeighIntervalHello OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The interval between EGP Hello command
                      retransmissions (in hundredths of a second).  This
                      represents the t1 timer as defined in RFC 904."
              ::= { egpNeighEntry 12 }

          egpNeighIntervalPoll OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The interval between EGP poll command



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                      retransmissions (in hundredths of a second).  This
                      represents the t3 timer as defined in RFC 904."
              ::= { egpNeighEntry 13 }

          egpNeighMode OBJECT-TYPE
              SYNTAX  INTEGER { active(1), passive(2) }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The polling mode of this EGP entity, either
                      passive or active."
              ::= { egpNeighEntry 14 }

          egpNeighEventTrigger OBJECT-TYPE
              SYNTAX  INTEGER { start(1), stop(2) }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "A control variable used to trigger operator-
                      initiated Start and Stop events.  When read, this
                      variable always returns the most recent value that
                      egpNeighEventTrigger was set to.  If it has not
                      been set since the last initialization of the
                      network management subsystem on the node, it
                      returns a value of `stop'.

                      When set, this variable causes a Start or Stop
                      event on the specified neighbor, as specified on
                      pages 8-10 of RFC 904.  Briefly, a Start event
                      causes an Idle peer to begin neighbor acquisition
                      and a non-Idle peer to reinitiate neighbor
                      acquisition.  A stop event causes a non-Idle peer
                      to return to the Idle state until a Start event
                      occurs, either via egpNeighEventTrigger or
                      otherwise."
              ::= { egpNeighEntry 15 }


          -- additional EGP objects

          egpAs OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The autonomous system number of this EGP entity."
              ::= { egp 6 }




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          --The Transmission group

          -- Based on the transmission media underlying each interface
          -- on a system, the corresponding portion of the Transmission
          -- group is mandatory for that system.

          -- When Internet-standard definitions for managing
          -- transmission media are defined, the transmission group is
          -- used to provide a prefix for the names of those objects.

          -- Typically, such definitions reside in the experimental
          -- portion of the MIB until they are "proven", then as a
          -- part of the Internet standardization process, the
          -- definitions are accordingly elevated and a new object
          -- identifier, under the transmission group is defined. By
          -- convention, the name assigned is:
          --
          --     type OBJECT IDENTIFIER    ::= { transmission number }
          --
          -- where "type" is the symbolic value used for the media in
          -- the ifType column of the ifTable object, and "number" is
          -- the actual integer value corresponding to the symbol.


          The SNMP group

          -- Implementation of the SNMP group is mandatory for all
          -- systems that support an SNMP protocol entity. Some of the
          -- objects defined in this group will be zero-valued in those
          -- SNMP implementations that are optimized to support only
          -- those functions specific to either a management agent or
          -- a management station. The objects refer to an SNMP entity,
          -- and there may be several SNMP entities residing on a
          -- managed node (for example, if the node is hosting acting as
          -- a management station).

          snmpInPkts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of messages delivered to the
                      SNMP entity from the transport service.
              ::= { snmp 1 }

          snmpOutPkts OBJECT-TYPE
              SYNTAX  Counter



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              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP messages that were
                      passed from the SNMP protocol entity to the
                      transport service.
              ::= { snmp 2 }

          snmpInBadVersions OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP messages that were
                      delivered to the SNMP protocol entity and were for
                      an unsupported SNMP version.
              ::= { snmp 3 }

          snmpInBadCommunityNames OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP messages delivered to
                      the SNMP protocol entity, which used an SNMP
                      community name not known to said entity.
              ::= { snmp 4 }

          snmpInBadCommunityUses OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP messages delivered to
                      the SNMP protocol entity, which represented an                 SNMP operation that was not allowed by the SNMP
                      community named in the message.
              ::= { snmp 5 }

          snmpInASNParseErrs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of ASN.1 or BER errors
                      encountered by the SNMP protocol entity when
                      decoding received SNMP messages.
              ::= { snmp 6 }



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          -- { snmp 7 } is not used

          snmpInTooBigs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      delivered to the SNMP protocol entity and for
                      which the error-status field is “tooBig”.
               ::= { snmp 8 }

          snmpInNoSuchNames OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      delivered to the SNMP protocol entity and for
                      which the value of the error-status field is
                      “noSuchName”.
              ::= { snmp 9 }

          snmpInBadValues OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      delivered to the SNMP protocol entity and for
                      which the value of the error-status field is
                      “badValue”.
              ::= { snmp 10 }

          snmpInReadOnlys OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number valid SNMP PDUs that were
                      delivered to the SNMP protocol entity and for
                      which the value of the error-status field is
                      “readOnly”.
           ::= { snmp 11 }


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RFC 1213                         MIB-II                       March 1991




          snmpInGenErrs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      delivered to the SNMP protocol entity and for
                      which the value of the error-status field is
                      “genErr”.
              ::= { snmp 12 }

          snmpInTotalReqVars OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of MIB objects that have been
                      retrieved successfully by the SNMP protocol entity
                      as the result of receiving valid SNMP Get-Request
                      and Get-Next PDUs.
              ::= { snmp 13 }

          snmpInTotalSetVars OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of MIB objects that have been
                      altered successfully by the SNMP protocol entity
                      as the result of receiving valid SNMP Set-Request
                      PDUs.
              ::= { snmp 14 }

          snmpInGetRequests OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Get-Request PDUs that
                      have been accepted and processed by the SNMP
                      protocol entity.
              ::= { snmp 15 }

          snmpInGetNexts OBJECT-TYPE
              SYNTAX  Counter



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              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Get-Next PDUs that have
                      been accepted and processed by the SNMP protocol
                      entity.
              ::= { snmp 16 }

          snmpInSetRequests OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Set-Request PDUs that
                      have been accepted and processed by the SNMP
                      protocol entity.
              ::= { snmp 17 }

          snmpInGetResponses OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Get-Response PDUs that
                      have been accepted and processed by the SNMP
                      protocol entity.
              ::= { snmp 18 }

          snmpInTraps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Trap PDUs that have
                      been accepted and processed by the SNMP protocol
                      entity.
              ::= { snmp 19 }

          snmpOutTooBigs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      generated by the SNMP protocol entity and for
                      which the value of the error-status field is
                      “tooBig”.
              ::= { snmp 20 }



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          snmpOutNoSuchNames OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      generated by the SNMP protocol entity and for
                      which the value of the error-status is
                      “noSuchName”.
              ::= { snmp 21 }

          snmpOutBadValues OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      generated by the SNMP protocol entity and for
                      which the value of the error-status field is
                      “badValue”.
              ::= { snmp 22 }

          -- { snmp 23 } is not used

          snmpOutGenErrs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP PDUs that were
                      generated by the SNMP protocol entity and for
                      which the value of the error-status field is
                      “genErr”.
              ::= { snmp 24 }

          snmpOutGetRequests OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Get-Request PDUs that
                      have been generated by the SNMP protocol entity.
              ::= { snmp 25 }

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



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RFC 1213                         MIB-II                       March 1991


              DESCRIPTION
                      The total number of SNMP Get-Next PDUs that have
                      been generated by the SNMP protocol entity.
              ::= { snmp 26 }

          snmpOutSetRequests OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Set-Request PDUs that
                      have been generated by the SNMP protocol entity.
              ::= { snmp 27 }

          snmpOutGetResponses OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Get-Response PDUs that
                      have been generated by the SNMP protocol entity.
              ::= { snmp 28 }

          snmpOutTraps OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      The total number of SNMP Trap PDUs that have
                      been generated by the SNMP protocol entity.
              ::= { snmp 29 }

          snmpEnableAuthenTraps OBJECT-TYPE
              SYNTAX  INTEGER { enabled(1), disabled(2) }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      Indicates whether the SNMP agent process is
                      permitted to generate authentication-failure
                      traps. The value of this object overrides any
                      configuration information; as such, it provides a
                      means whereby all authentication-failure traps may
                      be disabled.
              ::= { snmp 30 }


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RFC 1213                         MIB-II                       March 1991


          END

7.  Acknowledgements

   This document was produced by the SNMP Working Group:

               Anne Ambler, Spider
               Karl Auerbach, Sun
               Fred Baker, ACC
               David Bridgham, Epilogue Technology
               Ken Brinkerhoff
               Ron Broersma, NOSC
               Brian Brown, Synoptics
               Jack Brown, US Army
               Theodore Brunner, Bellcore
               Jeff Buffum, HP
               Jeffrey Buffum, HP
               John Burress, Wellfleet
               Jeffrey D. Case, University of Tennessee at Knoxville
               Chris Chiptasso, Spartacus
               Paul Ciarfella, DEC
               Bob Collet
               John Cook, Chipcom
               Tracy Cox, Bellcore
               James R. Davin, MIT-LCS
               Eric Decker, cisco
               Kurt Dobbins, Cabletron
               Nadya El-Afandi, Network Systems
               Gary Ellis, HP
               Fred Engle
               Mike Erlinger
               Mark S. Fedor, PSI
               Richard Fox, Synoptics
               Karen Frisa, CMU
               Stan Froyd, ACC
               Chris Gunner, DEC
               Fred Harris, University of Tennessee at Knoxville
               Ken Hibbard, Xylogics
               Ole Jacobsen, Interop
               Ken Jones
               Satish Joshi, Synoptics
               Frank Kastenholz, Racal-Interlan
               Shimshon Kaufman, Spartacus
               Ken Key, University of Tennessee at Knoxville
               Jim Kinder, Fibercom
               Alex Koifman, BBN



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RFC 1213                         MIB-II                       March 1991


               Christopher Kolb, PSI
               Cheryl Krupczak, NCR
               Paul Langille, DEC
               Martin Lee Schoffstall, PSI
               Peter Lin, Vitalink
               John Lunny, TWG
               Carl Malamud
               Gary Malkin, FTP Software, Inc.
               Randy Mayhew, University of Tennessee at Knoxville
               Keith McCloghrie, Hughes LAN Systems
               Donna McMaster, David Systems
               Lynn Monsanto, Sun
               Dave Perkins, 3COM
               Jim Reinstedler, Ungerman Bass
               Anil Rijsinghani, DEC
               Kathy Rinehart, Arnold AFB
               Kary Robertson
               Marshall T. Rose, PSI (chair)
               L. Michael Sabo, NCSC
               Jon Saperia, DEC
               Greg Satz, cisco
               Martin Schoffstall, PSI
               John Seligson
               Steve Sherry, Xyplex
               Fei Shu, NEC
               Sam Sjogren, TGV
               Mark Sleeper, Sparta
               Lance Sprung
               Mike St.Johns
               Bob Stewart, Xyplex
               Emil Sturniold
               Kaj Tesink, Bellcore
               Geoff Thompson, Synoptics
               Dean Throop, Data General
               Bill Townsend, Xylogics
               Maurice Turcotte, Racal-Milgo
               Kannan Varadhou
               Sudhanshu Verma, HP
               Bill Versteeg, Network Research Corporation
               Warren Vik, Interactive Systems
               David Waitzman, BBN
               Steve Waldbusser, CMU
               Dan Wintringhan
               David Wood
               Wengyik Yeong, PSI
               Jeff Young, Cray Research





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   In addition, the comments of the following individuals are also
   acknolwedged:

               Craig A. Finseth, Minnesota Supercomputer Center, Inc.
               Jeffrey C. Honig, Cornell University Theory Center
               Philip R. Karn, Bellcore

8.  References

   [1] Cerf, V., "IAB Recommendations for the Development of Internet
       Network Management Standards", RFC 1052, NRI, April 1988.

   [2] Rose M., and K. McCloghrie, "Structure and Identification of
       Management Information for TCP/IP-based internets," RFC 1065,
       TWG, August 1988.

   [3] McCloghrie, K., and M. Rose, "Management Information Base for
       Network Management of TCP/IP-based internets, RFC 1066, TWG,
       August 1988.

   [4] Cerf, V., "Report of the Second Ad Hoc Network Management Review
       Group", RFC 1109, NRI, August 1989.

   [5] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
       Network Management Protocol (SNMP)", RFC 1098, University of
       Tennessee at Knoxville, NYSERNet, Inc., Rensselaer Polytechnic
       Institute, MIT Laboratory for Computer Science, April 1989.

   [6] Postel, J., and J. Reynolds, "TELNET Protocol Specification", RFC
       854, USC/Information Sciences Institute, May 1983.

   [7] Satz, G., "Connectionless Network Protocol (ISO 8473) and End
       System to Intermediate System (ISO 9542) Management Information
       Base", RFC 1162, cisco Systems, Inc., June 1990.

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

   [9] Information processing systems - Open Systems Interconnection -
       Specification of Basic Encoding Rules for Abstract Notation One
       (ASN.1), International Organization for Standardization,
       International Standard 8825, December 1987.

  [10] Jacobson, V., "Congestion Avoidance and Control", SIGCOMM 1988,
       Stanford, California.




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RFC 1213                         MIB-II                       March 1991


  [11] Hagens, R., Hall, N., and M. Rose, "Use of the Internet as a
       Subnetwork for Experimentation with the OSI Network Layer", RFC
       1070, U of Wiscsonsin - Madison, U of Wiscsonsin - Madison, The
       Wollongong Group, February 1989.

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

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

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

9.  Security Considerations

   Security issues are not discussed in this memo.

10.  Authors' Addresses

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

   Phone: [phone]

   EMail: [e-mail]


   Marshall T. Rose
   Performance Systems International
   5201 Great America Parkway
   Suite 3106
   Santa Clara, CA  95054

   Phone: [phone]

   EMail: [e-mail]
   X.500:  rose, psi, us





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