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RFC 1213

 
 
 

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

Part 2 of 3, p. 12 to 41
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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 }

6.1.      -- 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.


6.2.      -- 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 }


6.3.      -- 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 0 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,
                      software operating-system, and networking
                      software.  It is mandatory that this only contain
                      printable ASCII characters."
              ::= { 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 an
                      easy and unambiguous means for determining `what
                      kind of box' is being managed.  For example, if
                      vendor `Flintstones, Inc.' was assigned the
                      subtree 1.3.6.1.4.1.4242, it could assign the
                      identifier 1.3.6.1.4.1.4242.1.1 to its `Fred
                      Router'."
              ::= { 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
                      re-initialized."
              ::= { 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 (e.g.,
                      `telephone closet, 3rd floor')."
              ::= { system 6 }

          sysServices OBJECT-TYPE
              SYNTAX  INTEGER (0..127)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "A value which indicates the set of services that
                      this entity primarily 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.  For
                      example, a node which performs primarily routing
                      functions would have a value of 4 (2^(3-1)).  In
                      contrast, a node which is a host offering
                      application services would have a value of 72
                      (2^(4-1) + 2^(7-1)).  Note that in the context of
                      the Internet suite of protocols, values should be
                      calculated accordingly:

                           layer  functionality
                               1  physical (e.g., repeaters)
                               2  datalink/subnetwork (e.g., bridges)
                               3  internet (e.g., IP gateways)
                               4  end-to-end  (e.g., IP hosts)
                               7  applications (e.g., mail relays)

                      For systems including OSI protocols, layers 5 and
                      6 may also be counted."
              ::= { system 7 }

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6.4.      -- 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

          -- The Interfaces table contains information on the entity's
          -- interfaces.  Each interface is thought of as being
          -- attached to a `subnetwork'.  Note that 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 re-initialization of the entity's
                      network management system to the next re-
                      initialization."
              ::= { 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 which can be
                      sent/received on the interface, specified in
                      octets.  For interfaces that are 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 which 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 which do not have

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                      such an address (e.g., 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 prior to the last re-
                      initialization 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 (i.e., 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 which were chosen
                      to be discarded even though no errors had been
                      detected to prevent their being deliverable 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 preventing them from being deliverable 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
                      which 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 (i.e., 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 which 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 to realize the
                      interface.  For example, if the interface is
                      realized by an ethernet, then the value of this
                      object refers to a document defining objects
                      specific to ethernet.  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."
              ::= { ifEntry 22 }


6.5.      -- 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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                  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 }


6.6.      -- 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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          -- 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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                  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 contain 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 }




(page 41 continued on part 3)

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