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RFC 1271

 
 
 

Remote Network Monitoring Management Information Base

Part 2 of 4, p. 10 to 41
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6.  Definitions

          RFC1271-MIB DEFINITIONS ::= BEGIN

              IMPORTS
                  Counter                              FROM RFC1155-SMI
                  DisplayString                        FROM RFC1158-MIB
                  mib-2                                FROM RFC1213-MIB
                  OBJECT-TYPE                          FROM RFC-1212;

          --  This MIB module uses the extended OBJECT-TYPE macro as
          --  defined in [9].


          --  Remote Network Monitoring MIB

              rmon    OBJECT IDENTIFIER ::= { mib-2 16 }


              -- textual conventions

              OwnerString ::= DisplayString
              -- This data type is used to model an administratively
              -- assigned name of the owner of a resource. This
              -- information is taken from the NVT ASCII character set.
              -- It is suggested that this name contain one or more
              -- of the following:
              -- IP address, management station name, network manager's
              -- name, location, or phone number.
              -- In some cases the agent itself will be the owner of
              -- an entry.  In these cases, this string shall be set
              -- to a string starting with 'monitor'.

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              --
              -- SNMP access control is articulated entirely in terms of
              -- the contents of MIB views; access to a particular SNMP
              -- object instance depends only upon its presence or
              -- absence in a particular MIB view and never upon its
              -- value or the value of related object instances. Thus,
              -- objects of this type afford resolution of resource
              -- contention only among cooperating managers; they
              -- realize no access control function with respect
              -- to uncooperative parties.
              --
              -- By convention, objects with this syntax are declared
              -- as having
              --
              --      SIZE (0..127)


              EntryStatus ::= INTEGER
                         { valid(1),
                           createRequest(2),
                           underCreation(3),
                           invalid(4)
                         }

              -- The status of a table entry.
              --
              -- Setting this object to the value invalid(4) has the
              -- effect of invalidating the corresponding entry.
              -- That is, it effectively disassociates 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 currently not in use.  Proper
              -- interpretation of such entries requires examination
              -- of the relevant EntryStatus object.
              --
              -- An existing instance of this object cannot be set to
              -- createRequest(2).  This object may only be set to
              -- createRequest(2) when this instance is created.  When
              -- this object is created, the agent may wish to create
              -- supplemental object instances to complete a conceptual
              -- row in this table.  Immediately after completing the
              -- create operation, the agent must set this object to
              -- underCreation(3).
              --
              -- Entries shall exist in the underCreation(3) state until

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              -- the management station is finished configuring the
              -- entry and sets this object to valid(1) or aborts,
              -- setting this object to invalid(4).  If the agent
              -- determines that an entry has been in the
              -- underCreation(3) state for an abnormally long time,
              -- it may decide that the management station has
              -- crashed.  If the agent makes this decision,
              -- it may set this object to invalid(4) to reclaim the
              -- entry.  A prudent agent will understand that the
              -- management station may need to wait for human input
              -- and will allow for that possibility in its
              -- determination of this abnormally long period.


              statistics        OBJECT IDENTIFIER ::= { rmon 1 }
              history           OBJECT IDENTIFIER ::= { rmon 2 }
              alarm             OBJECT IDENTIFIER ::= { rmon 3 }
              hosts             OBJECT IDENTIFIER ::= { rmon 4 }
              hostTopN          OBJECT IDENTIFIER ::= { rmon 5 }
              matrix            OBJECT IDENTIFIER ::= { rmon 6 }
              filter            OBJECT IDENTIFIER ::= { rmon 7 }
              capture           OBJECT IDENTIFIER ::= { rmon 8 }
              event             OBJECT IDENTIFIER ::= { rmon 9 }


          -- The Statistics Group
          --
          -- Implementation of the Statistics group is optional.
          --
          -- The statistics group contains statistics measured by the
          -- probe for each monitored interface on this device.  These
          -- statistics take the form of free running counters that
          -- start from zero when a valid entry is created.
          --
          -- This group currently has statistics defined only for
          -- Ethernet interfaces.  Each etherStatsEntry contains
          -- statistics for one Ethernet interface.  The probe must
          -- create one etherStats entry for each monitored Ethernet
          -- interface on the device.

          etherStatsTable OBJECT-TYPE
              SYNTAX SEQUENCE OF EtherStatsEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of Ethernet statistics entries."
              ::= { statistics 1 }

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          etherStatsEntry OBJECT-TYPE
              SYNTAX EtherStatsEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A collection of statistics kept for a particular
                  Ethernet interface."
              INDEX { etherStatsIndex }
              ::= { etherStatsTable 1 }

          EtherStatsEntry ::= SEQUENCE {
              etherStatsIndex                    INTEGER (1..65535),
              etherStatsDataSource               OBJECT IDENTIFIER,
              etherStatsDropEvents               Counter,
              etherStatsOctets                   Counter,
              etherStatsPkts                     Counter,
              etherStatsBroadcastPkts            Counter,
              etherStatsMulticastPkts            Counter,
              etherStatsCRCAlignErrors           Counter,
              etherStatsUndersizePkts            Counter,
              etherStatsOversizePkts             Counter,
              etherStatsFragments                Counter,
              etherStatsJabbers                  Counter,
              etherStatsCollisions               Counter,
              etherStatsPkts64Octets             Counter,
              etherStatsPkts65to127Octets        Counter,
              etherStatsPkts128to255Octets       Counter,
              etherStatsPkts256to511Octets       Counter,
              etherStatsPkts512to1023Octets      Counter,
              etherStatsPkts1024to1518Octets     Counter,
              etherStatsOwner                    OwnerString,
              etherStatsStatus                   INTEGER
          }

          etherStatsIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The value of this object uniquely identifies this
                  etherStats entry."
              ::= { etherStatsEntry 1 }

          etherStatsDataSource OBJECT-TYPE
              SYNTAX OBJECT IDENTIFIER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION

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                  "This object identifies the source of the data that
                  this etherStats entry is configured to analyze.  This
                  source can be any ethernet interface on this device.
                  In order to identify a particular interface, this
                  object shall identify the instance of the ifIndex
                  object, defined in [4,6], for the desired interface.
                  For example, if an entry were to receive data from
                  interface #1, this object would be set to ifIndex.1.

                  The statistics in this group reflect all packets
                  on the local network segment attached to the
                  identified interface.

                  This object may not be modified if the associated
                  etherStatsStatus object is equal to valid(1)."
              ::= { etherStatsEntry 2 }

          etherStatsDropEvents OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of events in which packets
                  were dropped by the probe due to lack of resources.
                  Note that this number is not necessarily the number of
                  packets dropped; it is just the number of times this
                  condition has been detected."
              ::= { etherStatsEntry 3 }

          etherStatsOctets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of octets of data (including
                  those in bad packets) received on the
                  network (excluding framing bits but including
                  FCS octets)."
              ::= { etherStatsEntry 4 }

          etherStatsPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error packets)
                  received."
              ::= { etherStatsEntry 5 }

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          etherStatsBroadcastPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of good packets received that were
                  directed to the broadcast address."
              ::= { etherStatsEntry 6 }

          etherStatsMulticastPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of good packets received that were
                  directed to a multicast address.  Note that this
                  number does not include packets directed to the
                  broadcast address."
              ::= { etherStatsEntry 7 }

          etherStatsCRCAlignErrors OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets received that
                  had a length (excluding framing bits, but
                  including FCS octets) of between 64 and 1518
                  octets, inclusive, but were not an integral number
                  of octets in length or had a bad Frame Check
                  Sequence (FCS)."
              ::= { etherStatsEntry 8 }

          etherStatsUndersizePkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets received that were
                  less than 64 octets long (excluding framing bits,
                  but including FCS octets) and were otherwise well
                  formed."
              ::= { etherStatsEntry 9 }

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

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              DESCRIPTION
                  "The total number of packets received that were
                  longer than 1518 octets (excluding framing bits,
                  but including FCS octets) and were otherwise
                  well formed."
              ::= { etherStatsEntry 10 }

          etherStatsFragments OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets received that were not an
                  integral number of octets in length or that had a bad
                  Frame Check Sequence (FCS), and were less than 64
                  octets in length (excluding framing bits but
                  including FCS octets)."
              ::= { etherStatsEntry 11 }

          etherStatsJabbers OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets received that were
                  longer than 1518 octets (excluding framing bits,
                  but including FCS octets), and were not an
                  integral number of octets in length or had
                  a bad Frame Check Sequence (FCS)."
              ::= { etherStatsEntry 12 }

          etherStatsCollisions OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The best estimate of the total number of collisions
                  on this Ethernet segment."
              ::= { etherStatsEntry 13 }

          etherStatsPkts64Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were 64 octets in length
                  (excluding framing bits but including FCS octets)."

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              ::= { etherStatsEntry 14 }

          etherStatsPkts65to127Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were between
                  65 and 127 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 15 }

          etherStatsPkts128to255Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were between
                  128 and 255 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 16 }

          etherStatsPkts256to511Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were between
                  256 and 511 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 17 }

          etherStatsPkts512to1023Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were between
                  512 and 1023 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 18 }

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          etherStatsPkts1024to1518Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including error
                  packets) received that were between
                  1024 and 1518 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 19 }

          etherStatsOwner OBJECT-TYPE
              SYNTAX OwnerString
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The entity that configured this entry and is
                  therefore using the resources assigned to it."
              ::= { etherStatsEntry 20 }

          etherStatsStatus OBJECT-TYPE
              SYNTAX EntryStatus
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The status of this etherStats entry."
              ::= { etherStatsEntry 21 }


          -- The History Group

          -- Implementation of the History group is optional.
          --
          -- The history group records periodic statistical samples from
          -- a network and stores them for later retrieval.  The
          -- historyControl table stores configuration entries that each
          -- define an interface, polling period, and other parameters.
          -- Once samples are taken, their data is stored in an entry
          -- in a media-specific table.  Each such entry defines one
          -- sample, and is associated with the historyControlEntry that
          -- caused the sample to be taken.  Currently the only media-
          -- specific table defined is the etherHistoryTable, for
          -- Ethernet networks.
          --
          -- If the probe keeps track of the time of day, it should
          -- start the first sample of the history at a time such that
          -- when the next hour of the day begins, a sample is
          -- started at that instant.  This tends to make more

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          -- user-friendly reports, and enables comparison of reports
          -- from different probes that have relatively accurate time
          -- of day.
          --
          -- The monitor is encouraged to add two history control entries
          -- per monitored interface upon initialization that describe
          -- a short term and a long term polling period.  Suggested
          -- parameters are 30 seconds for the short term polling
          -- period and 30 minutes for the long term period.

          historyControlTable OBJECT-TYPE
              SYNTAX SEQUENCE OF HistoryControlEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of history control entries."
              ::= { history 1 }

          historyControlEntry OBJECT-TYPE
              SYNTAX HistoryControlEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of parameters that set up a periodic
                  sampling of statistics."
              INDEX { historyControlIndex }
              ::= { historyControlTable 1 }

          HistoryControlEntry ::= SEQUENCE {
              historyControlIndex             INTEGER (1..65535),
              historyControlDataSource        OBJECT IDENTIFIER,
              historyControlBucketsRequested  INTEGER (1..65535),
              historyControlBucketsGranted    INTEGER (1..65535),
              historyControlInterval          INTEGER (1..3600),
              historyControlOwner             OwnerString,
              historyControlStatus            INTEGER
          }

          historyControlIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that uniquely identifies an entry in the
                  historyControl table.  Each such entry defines a
                  set of samples at a particular interval for an
                  interface on the device."
              ::= { historyControlEntry 1 }

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          historyControlDataSource OBJECT-TYPE
              SYNTAX OBJECT IDENTIFIER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "This object identifies the source of the data for
                  which historical data was collected and
                  placed in a media-specific table on behalf of this
                  historyControlEntry.  This source can be any
                  interface on this device.  In order to identify
                  a particular interface, this object shall identify
                  the instance of the ifIndex object, defined
                  in [4,6], for the desired interface.  For example,
                  if an entry were to receive data from interface #1,
                  this object would be set to ifIndex.1.

                  The statistics in this group reflect all packets
                  on the local network segment attached to the
                  identified interface.

                  This object may not be modified if the associated
                  historyControlStatus object is equal to valid(1)."
              ::= { historyControlEntry 2 }

          historyControlBucketsRequested OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The requested number of discrete time intervals
                  over which data is to be saved in the part of the
                  media-specific table associated with this
                  historyControl entry.

                  When this object is created or modified, the probe
                  should set historyControlBucketsGranted as closely to
                  this object as is possible for the particular probe
                  implementation and available resources."
              DEFVAL { 50 }
              ::= { historyControlEntry 3 }

          historyControlBucketsGranted OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of discrete sampling intervals
                  over which data shall be saved in the part of

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                  the media-specific table associated with this
                  historyControl entry.

                  When the associated historyControlBucketsRequested
                  object is created or modified, the probe
                  should set this object as closely to the requested
                  value as is possible for the particular
                  probe implementation and available resources.  The
                  probe must not lower this value except as a result
                  of a modification to the associated
                  historyControlBucketsRequested object.

                  There will be times when the actual number of
                  buckets associated with this entry is less than
                  the value of this object.  In this case, at the
                  end of each sampling interval, a new bucket will
                  be added to the media-specific table.

                  When the number of buckets reaches the value of
                  this object and a new bucket is to be added to the
                  media-specific table, the oldest bucket associated
                  with this historyControlEntry shall be deleted by
                  the agent so that the new bucket can be added.

                  When the value of this object changes to a value less
                  than the current value, entries are deleted
                  from the media-specific table associated with this
                  historyControlEntry.  Enough of the oldest of these
                  entries shall be deleted by the agent so that their
                  number remains less than or equal to the new value of
                  this object.

                  When the value of this object changes to a value
                  greater than the current value, the number of
                  associated media-specific entries may be allowed
                  to grow."
              ::= { historyControlEntry 4 }

          historyControlInterval OBJECT-TYPE
              SYNTAX INTEGER (1..3600)
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The interval in seconds over which the data is
                  sampled for each bucket in the part of the
                  media-specific table associated with this
                  historyControl entry.  This interval can
                  be set to any number of seconds between 1 and

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                  3600 (1 hour).

                  Because the counters in a bucket may overflow at their
                  maximum value with no indication, a prudent manager
                  will take into account the possibility of overflow
                  in any of the associated counters.  It is important
                  to consider the minimum time in which any counter
                  could overflow on a particular media type and set
                  the historyControlInterval object to a value less
                  than this interval.  This is typically most
                  important for the 'octets' counter in any
                  media-specific table.  For example, on an Ethernet
                  network, the etherHistoryOctets counter could overflow
                  in about one hour at the Ethernet's maximum
                  utilization.

                  This object may not be modified if the associated
                  historyControlStatus object is equal to valid(1)."
              DEFVAL { 1800 }
              ::= { historyControlEntry 5 }

          historyControlOwner OBJECT-TYPE
              SYNTAX OwnerString
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The entity that configured this entry and is therefore
                  using the resources assigned to it."
              ::= { historyControlEntry 6 }

          historyControlStatus OBJECT-TYPE
              SYNTAX EntryStatus
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The status of this historyControl entry.

                  Each instance of the media-specific table associated
                  with this historyControlEntry will be deleted by the
                  agent if this historyControlEntry is not equal to
                  valid(1)."
              ::= { historyControlEntry 7 }


          -- Ether History table

          etherHistoryTable OBJECT-TYPE
              SYNTAX SEQUENCE OF EtherHistoryEntry

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              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of Ethernet history entries."
              ::= { history 2 }

          etherHistoryEntry OBJECT-TYPE
              SYNTAX EtherHistoryEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "An historical sample of Ethernet statistics on a
                  particular Ethernet interface.  This sample is
                  associated with the historyControlEntry which set
                  up the parameters for a regular collection of these
                  samples."
              INDEX { etherHistoryIndex , etherHistorySampleIndex }
              ::= { etherHistoryTable 1 }

          EtherHistoryEntry ::= SEQUENCE {
              etherHistoryIndex                 INTEGER (1..65535),
              etherHistorySampleIndex           INTEGER,
              etherHistoryIntervalStart         TimeTicks,
              etherHistoryDropEvents            Counter,
              etherHistoryOctets                Counter,
              etherHistoryPkts                  Counter,
              etherHistoryBroadcastPkts         Counter,
              etherHistoryMulticastPkts         Counter,
              etherHistoryCRCAlignErrors        Counter,
              etherHistoryUndersizePkts         Counter,
              etherHistoryOversizePkts          Counter,
              etherHistoryFragments             Counter,
              etherHistoryJabbers               Counter,
              etherHistoryCollisions            Counter,
              etherHistoryUtilization           INTEGER (0..10000)
          }

          etherHistoryIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The history of which this entry is a part.  The
                  history identified by a particular value of this
                  index is the same history as identified
                  by the same value of historyControlIndex."
              ::= { etherHistoryEntry 1 }

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          etherHistorySampleIndex OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that uniquely identifies the particular
                  sample this entry represents among all samples
                  associated with the same historyControlEntry.
                  This index starts at 1 and increases by one
                  as each new sample is taken."
              ::= { etherHistoryEntry 2 }

          etherHistoryIntervalStart OBJECT-TYPE
              SYNTAX TimeTicks
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The value of sysUpTime at the start of the interval
                  over which this sample was measured.  If the probe
                  keeps track of the time of day, it should start
                  the first sample of the history at a time such that
                  when the next hour of the day begins, a sample is
                  started at that instant.  Note that following this
                  rule may require the probe to delay collecting the
                  first sample of the history, as each sample must be
                  of the same interval.  Also note that the sample which
                  is currently being collected is not accessible in this
                  table until the end of its interval."
              ::= { etherHistoryEntry 3 }

          etherHistoryDropEvents OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of events in which packets
                  were dropped by the probe due to lack of resources
                  during this interval.  Note that this number is not
                  necessarily the number of packets dropped, it is just
                  the number of times this condition has been detected."
              ::= { etherHistoryEntry 4 }

          etherHistoryOctets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of octets of data (including

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                  those in bad packets) received on the
                  network (excluding framing bits but including
                  FCS octets)."
              ::= { etherHistoryEntry 5 }

          etherHistoryPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets (including error packets)
                  received during this sampling interval."
              ::= { etherHistoryEntry 6 }

          etherHistoryBroadcastPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of good packets received during this
                  sampling interval that were directed to the
                  broadcast address."
              ::= { etherHistoryEntry 7 }

          etherHistoryMulticastPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of good packets received during this
                  sampling interval that were directed to a
                  multicast address.  Note that this number does not
                  include packets addressed to the broadcast address."
              ::= { etherHistoryEntry 8 }

          etherHistoryCRCAlignErrors OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets received during this
                  sampling interval that had a length (excluding
                  framing bits but including FCS octets) between
                  64 and 1518 octets, inclusive, but were not an
                  integral number of octets in length or had a
                  bad Frame Check Sequence (FCS)."
              ::= { etherHistoryEntry 9 }

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          etherHistoryUndersizePkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets received during this
                  interval that were less than 64 octets long
                  (excluding framing bits but including FCS
                  octets) and were otherwise well formed."
              ::= { etherHistoryEntry 10 }

          etherHistoryOversizePkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets received during this
                  interval that were longer than 1518 octets
                  (excluding framing bits but including FCS
                  octets) but were otherwise well formed."
              ::= { etherHistoryEntry 11 }

          etherHistoryFragments OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets received during this
                  sampling interval that were not an integral
                  number of octets in length or that
                  had a bad Frame Check Sequence (FCS), and
                  were less than 64 octets in length (excluding
                  framing bits but including FCS octets)."
              ::= { etherHistoryEntry 12 }

          etherHistoryJabbers OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets received during this
                  interval that were longer than 1518 octets
                  (excluding framing bits but including FCS octets),
                  and were not an integral number of octets in
                  length or had a bad Frame Check Sequence (FCS)."
              ::= { etherHistoryEntry 13 }

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          etherHistoryCollisions OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The best estimate of the total number of collisions
                  on this Ethernet segment during this interval."
              ::= { etherHistoryEntry 14 }

          etherHistoryUtilization OBJECT-TYPE
              SYNTAX INTEGER (0..10000)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The best estimate of the mean physical layer
                  network utilization on this interface during this
                  interval, in hundredths of a percent."
              ::= { etherHistoryEntry 15 }


          -- The Alarm Group

          -- Implementation of the Alarm group is optional.
          --
          -- The Alarm Group requires the implementation of the Event
          -- group.
          --
          -- The Alarm group periodically takes statistical samples from
          -- variables in the probe and compares them to thresholds
          -- that have been configured.  The alarm table stores
          -- configuration entries that each define a variable,
          -- polling period, and threshold parameters.  If a sample is
          -- found to cross the threshold values, an event is
          -- generated.  Only variables that resolve to an ASN.1
          -- primitive type of INTEGER (INTEGER, Counter,
          -- Gauge, or TimeTicks) may be monitored in this way.
          --
          -- This function has a hysteresis mechanism to limit the
          -- generation of events.  This mechanism generates one event
          -- as a threshold is crossed in the appropriate direction.
          -- No more events are generated for that threshold until the
          -- opposite threshold is crossed.
          --
          -- In the case of a sampling a deltaValue, a probe may
          -- implement this mechanism with more precision if it takes
          -- a delta sample twice per period, each time comparing the
          -- sum of the latest two samples to the threshold.  This
          -- allows the detection of threshold crossings

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          -- that span the sampling boundary.  Note that this does not
          -- require any special configuration of the threshold value.
          -- It is suggested that probes implement this more precise
          -- algorithm.

          alarmTable OBJECT-TYPE
              SYNTAX SEQUENCE OF AlarmEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of alarm entries."
              ::= { alarm 1 }

          alarmEntry OBJECT-TYPE
              SYNTAX AlarmEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of parameters that set up a periodic checking
                  for alarm conditions."
              INDEX { alarmIndex }
              ::= { alarmTable 1 }

          AlarmEntry ::= SEQUENCE {
              alarmIndex                    INTEGER (1..65535),
              alarmInterval                 INTEGER,
              alarmVariable                 OBJECT IDENTIFIER,
              alarmSampleType               INTEGER,
              alarmValue                    INTEGER,
              alarmStartupAlarm             INTEGER,
              alarmRisingThreshold          INTEGER,
              alarmFallingThreshold         INTEGER,
              alarmRisingEventIndex         INTEGER (1..65535),
              alarmFallingEventIndex        INTEGER (1..65535),
              alarmOwner                    OwnerString,
              alarmStatus                   INTEGER
          }

          alarmIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that uniquely identifies an entry in the
                  alarm table.  Each such entry defines a
                  diagnostic sample at a particular interval
                  for an object on the device."
              ::= { alarmEntry 1 }

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          alarmInterval OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The interval in seconds over which the data is
                  sampled and compared with the rising and falling
                  thresholds.  When setting this variable, care
                  should be given to ensure that the variable being
                  monitored will not exceed 2^31 - 1 and roll
                  over the alarmValue object during the interval.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 2 }

          alarmVariable OBJECT-TYPE
              SYNTAX OBJECT IDENTIFIER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The object identifier of the particular variable to
                  be sampled.  Only variables that resolve to an ASN.1
                  primitive type of INTEGER (INTEGER, Counter, Gauge,
                  or TimeTicks) may be sampled.

                  Because SNMP access control is articulated entirely
                  in terms of the contents of MIB views, no access
                  control mechanism exists that can restrict the value of
                  this object to identify only those objects that exist
                  in a particular MIB view.  Because there is thus no
                  acceptable means of restricting the read access that
                  could be obtained through the alarm mechanism, the
                  probe must only grant write access to this object in
                  those views that have read access to all objects on
                  the probe.

                  During a set operation, if the supplied variable
                  name is not available in the selected MIB view, a
                  badValue error must be returned.  If at any time
                  the variable name of an established alarmEntry is
                  no longer available in the selected MIB view, the
                  probe must change the status of this alarmEntry
                  to invalid(4).

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 3 }

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          alarmSampleType OBJECT-TYPE
              SYNTAX INTEGER {
                  absoluteValue(1),
                  deltaValue(2)
              }
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The method of sampling the selected variable and
                  calculating the value to be compared against the
                  thresholds.  If the value of this object is
                  absoluteValue(1), the value of the selected variable
                  will be compared directly with the thresholds at the
                  end of the sampling interval.  If the value of this
                  object is deltaValue(2), the value of the selected
                  variable at the last sample will be subtracted from
                  the current value, and the difference compared with
                  the thresholds.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 4 }

          alarmValue OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The value of the statistic during the last sampling
                  period.  The value during the current sampling period
                  is not made available until the period is completed."
              ::= { alarmEntry 5 }

          alarmStartupAlarm OBJECT-TYPE
              SYNTAX INTEGER {
                  risingAlarm(1),
                  fallingAlarm(2),
                  risingOrFallingAlarm(3)
              }
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The alarm that may be sent when this entry is first
                  set to valid.  If the first sample after this entry
                  becomes valid is greater than or equal to the
                  risingThreshold and alarmStartupAlarm is equal to
                  risingAlarm(1) or risingOrFallingAlarm(3), then a
                  single rising alarm will be generated.  If the first

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                  sample after this entry becomes valid is less than
                  or equal to the fallingThreshold and
                  alarmStartupAlarm is equal to fallingAlarm(2) or
                  risingOrFallingAlarm(3), then a single falling
                  alarm will be generated.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 6 }

          alarmRisingThreshold OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "A threshold for the sampled statistic.  When the
                  current sampled value is greater than or equal to
                  this threshold, and the value at the last sampling
                  interval was less than this threshold, a single
                  event will be generated.
                  A single event will also be generated if the first
                  sample after this entry becomes valid is greater
                  than or equal to this threshold and the associated
                  alarmStartupAlarm is equal to risingAlarm(1) or
                  risingOrFallingAlarm(3).

                  After a rising event is generated, another such event
                  will not be generated until the sampled value
                  falls below this threshold and reaches the
                  alarmFallingThreshold.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 7 }

          alarmFallingThreshold OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "A threshold for the sampled statistic.  When the
                  current sampled value is less than or equal to
                  this threshold, and the value at the last sampling
                  interval was greater than this threshold, a single
                  event will be generated.
                  A single event will also be generated if the first
                  sample after this entry becomes valid is less than or
                  equal to this threshold and the associated

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                  alarmStartupAlarm is equal to fallingAlarm(2) or
                  risingOrFallingAlarm(3).

                  After a falling event is generated, another such event
                  will not be generated until the sampled value
                  rises above this threshold and reaches the
                  alarmRisingThreshold.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 8 }

          alarmRisingEventIndex OBJECT-TYPE
              SYNTAX INTEGER (0..65535)
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The index of the eventEntry that is
                  used when a rising threshold is crossed.  The
                  eventEntry identified by a particular value of
                  this index is the same as identified by the same value
                  of the eventIndex object.  If there is no
                  corresponding entry in the eventTable, then
                  no association exists.  In particular, if this value
                  is zero, no associated event will be generated, as
                  zero is not a valid event index.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."
              ::= { alarmEntry 9 }

          alarmFallingEventIndex OBJECT-TYPE
              SYNTAX INTEGER (0..65535)
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The index of the eventEntry that is
                  used when a falling threshold is crossed.  The
                  eventEntry identified by a particular value of
                  this index is the same as identified by the same value
                  of the eventIndex object.  If there is no
                  corresponding entry in the eventTable, then
                  no association exists.  In particular, if this value
                  is zero, no associated event will be generated, as
                  zero is not a valid event index.

                  This object may not be modified if the associated
                  alarmStatus object is equal to valid(1)."

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              ::= { alarmEntry 10 }

          alarmOwner OBJECT-TYPE
              SYNTAX OwnerString
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The entity that configured this entry and is
                  therefore using the resources assigned to it."
              ::= { alarmEntry 11 }

          alarmStatus OBJECT-TYPE
              SYNTAX EntryStatus
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The status of this alarm entry."
              ::= { alarmEntry 12 }


          -- The Host Group

          -- Implementation of the Host group is optional.
          --
          -- The host group discovers new hosts on the network by
          -- keeping a list of source and destination MAC Addresses seen
          -- in good packets.  For each of these addresses, the host
          -- group keeps a set of statistics.  The hostControlTable
          -- controls which interfaces this function is performed on,
          -- and contains some information about the process.  On
          -- behalf of each hostControlEntry, data is collected on an
          -- interface and placed both the hostTable and the
          -- hostTimeTable.  If the monitoring device finds itself
          -- short of resources, it may delete entries as needed.  It
          -- is suggested that the device delete the least recently
          -- used entries first.

          -- The hostTable contains entries for each address
          -- discovered on a particular interface.  Each entry
          -- contains statistical data about that host.  This table
          -- is indexed by the MAC address of the host, through
          -- which a random access may be achieved.

          -- The hostTimeTable contains data in the same format as the
          -- hostTable, and must contain the same set of hosts, but is
          -- indexed using hostTimeCreationOrder rather than hostAddress.
          -- The hostTimeCreationOrder is an integer which reflects
          -- the relative order in which a particular entry was

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          -- discovered and thus inserted into the table.  As this
          -- order, and thus index, is among those entries currently
          -- in the table, the index for a particular entry may change
          -- if an (earlier) entry is deleted.  Thus the association
          -- between hostTimeCreationOrder and hostTimeEntry may be
          -- broken at any time.

          -- The hostTimeTable has two important uses.  The first is the
          -- fast download of this potentially large table.  Because the
          -- index of this table runs from 1 to the size of the table,
          -- inclusive, its values are predictable.  This allows very
          -- efficient packing of variables into SNMP PDU's and allows
          -- a table transfer to have multiple packets outstanding.
          -- These benefits increase transfer rates tremendously.

          -- The second use of the hostTimeTable is the efficient
          -- discovery by the management station of new entries added
          -- to the table.  After the management station has
          -- downloaded the entire table, it knows that new entries
          -- will be added immediately after the end of the current
          -- table.  It can thus detect new entries there
          -- and retrieve them easily.

          -- Because the association between hostTimeCreationOrder and
          -- hostTimeEntry may be broken at any time, the management
          -- station must monitor the related hostControlLastDeleteTime
          -- object.  When the management station thus detects a deletion,
          -- it must assume that any such associations have been broken,
          -- and invalidate any it has stored locally.  This includes
          -- restarting any download of the hostTimeTable that may have
          -- been in progress, as well as rediscovering the end of the
          -- hostTimeTable so that it may detect new entries.  If the
          -- management station does not detect the broken association,
          -- it may continue to refer to a particular host by its
          -- creationOrder while unwittingly retrieving the data
          -- associated with another host entirely.  If this happens
          -- while downloading the host table, the management station
          -- may fail to download all of the entries in the table.


          hostControlTable OBJECT-TYPE
              SYNTAX SEQUENCE OF HostControlEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of host table control entries."
              ::= { hosts 1 }

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          hostControlEntry OBJECT-TYPE
              SYNTAX HostControlEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of parameters that set up the discovery of
                  hosts on a particular interface and the collection
                  of statistics about these hosts."
              INDEX { hostControlIndex }
              ::= { hostControlTable 1 }

          HostControlEntry ::= SEQUENCE {
              hostControlIndex            INTEGER (1..65535),
              hostControlDataSource       OBJECT IDENTIFIER,
              hostControlTableSize        INTEGER,
              hostControlLastDeleteTime   TimeTicks,
              hostControlOwner            OwnerString,
              hostControlStatus           INTEGER
          }

          hostControlIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that uniquely identifies an entry in the
                  hostControl table.  Each such entry defines
                  a function that discovers hosts on a particular
                  interface and places statistics about them in the
                  hostTable and the hostTimeTable on behalf of this
                  hostControlEntry."
              ::= { hostControlEntry 1 }

          hostControlDataSource OBJECT-TYPE
              SYNTAX OBJECT IDENTIFIER
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "This object identifies the source of the data for
                  this instance of the host function.  This source
                  can be any interface on this device.  In order
                  to identify a particular interface, this object shall
                  identify the instance of the ifIndex object, defined
                  in [4,6], for the desired interface.  For example,
                  if an entry were to receive data from interface #1,
                  this object would be set to ifIndex.1.

                  The statistics in this group reflect all packets

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                  on the local network segment attached to the
                  identified interface.

                  This object may not be modified if the associated
                  hostControlStatus object is equal to valid(1)."
              ::= { hostControlEntry 2 }

          hostControlTableSize OBJECT-TYPE
              SYNTAX INTEGER
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of hostEntries in the hostTable and the
                  hostTimeTable associated with this hostControlEntry."
              ::= { hostControlEntry 3 }

          hostControlLastDeleteTime OBJECT-TYPE
              SYNTAX TimeTicks
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The value of sysUpTime when the last entry
                  was deleted from the portion of the hostTable
                  associated with this hostControlEntry.  If no
                  deletions have occurred, this value shall be zero."
              ::= { hostControlEntry 4 }

          hostControlOwner OBJECT-TYPE
              SYNTAX OwnerString
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The entity that configured this entry and is
                  therefore using the resources assigned to it."
              ::= { hostControlEntry 5 }

          hostControlStatus OBJECT-TYPE
              SYNTAX EntryStatus
              ACCESS read-write
              STATUS mandatory
              DESCRIPTION
                  "The status of this hostControl entry.

                  If this object is not equal to valid(1), all
                  associated entries in the hostTable,
                  hostTimeTable, and the hostTopNTable shall be
                  deleted by the agent."
              ::= { hostControlEntry 6 }

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          hostTable OBJECT-TYPE
              SYNTAX SEQUENCE OF HostEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of host entries."
              ::= { hosts 2 }

          hostEntry OBJECT-TYPE
              SYNTAX HostEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A collection of statistics for a particular host
                  that has been discovered on an interface of this
                  device."
              INDEX { hostIndex, hostAddress }
              ::= { hostTable 1 }

          HostEntry ::= SEQUENCE {
              hostAddress             OCTET STRING,
              hostCreationOrder       INTEGER (1..65535),
              hostIndex               INTEGER (1..65535),
              hostInPkts              Counter,
              hostOutPkts             Counter,
              hostInOctets            Counter,
              hostOutOctets           Counter,
              hostOutErrors           Counter,
              hostOutBroadcastPkts    Counter,
              hostOutMulticastPkts    Counter
          }

          hostAddress OBJECT-TYPE
              SYNTAX OCTET STRING
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The physical address of this host."
              ::= { hostEntry 1 }

          hostCreationOrder OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that defines the relative ordering of
                  the creation time of hosts captured for a
                  particular hostControlEntry.  This index shall

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                  be between 1 and N, where N is the value of
                  the associated hostControlTableSize.  The ordering
                  of the indexes is based on the order of each entry's
                  insertion into the table, in which entries added
                  earlier have a lower index value than entries added
                  later.

                  It is important to note that the order for a
                  particular entry may change as an (earlier) entry
                  is deleted from the table.  Because this order may
                  change, management stations should make use of the
                  hostControlLastDeleteTime variable in the
                  hostControlEntry associated with the relevant
                  portion of the hostTable.  By observing
                  this variable, the management station may detect
                  the circumstances where a previous association
                  between a value of hostCreationOrder
                  and a hostEntry may no longer hold."
              ::= { hostEntry 2 }

          hostIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The set of collected host statistics of which
                  this entry is a part.  The set of hosts
                  identified by a particular value of this
                  index is associated with the hostControlEntry
                  as identified by the same value of hostControlIndex."
              ::= { hostEntry 3 }

          hostInPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets without errors transmitted to
                  this address since it was added to the hostTable."
              ::= { hostEntry 4 }

          hostOutPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of packets including errors transmitted
                  by this address since it was added to the hostTable."

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              ::= { hostEntry 5 }

          hostInOctets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of octets transmitted to this address
                  since it was added to the hostTable (excluding
                  framing bits but including FCS octets), except for
                  those octets in packets that contained errors."
              ::= { hostEntry 6 }

          hostOutOctets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of octets transmitted by this address
                  since it was added to the hostTable (excluding
                  framing bits but including FCS octets), including
                  those octets in packets that contained errors."
              ::= { hostEntry 7 }

          hostOutErrors OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of error packets transmitted by this
                  address since this host was added to the hostTable."
              ::= { hostEntry 8 }

          hostOutBroadcastPkts OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The number of good packets transmitted by this
                  address that were directed to the broadcast address
                  since this host was added to the hostTable."
              ::= { hostEntry 9 }

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

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                  "The number of good packets transmitted by this
                  address that were directed to a multicast address
                  since this host was added to the hostTable.
                  Note that this number does not include packets
                  directed to the broadcast address."
              ::= { hostEntry 10 }


          -- host Time Table

          hostTimeTable OBJECT-TYPE
              SYNTAX SEQUENCE OF HostTimeEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A list of time-ordered host table entries."
              ::= { hosts 3 }

          hostTimeEntry OBJECT-TYPE
              SYNTAX HostTimeEntry
              ACCESS not-accessible
              STATUS mandatory
              DESCRIPTION
                  "A collection of statistics for a particular host
                  that has been discovered on an interface of this
                  device.  This collection includes the relative
                  ordering of the creation time of this object."
              INDEX { hostTimeIndex, hostTimeCreationOrder }
              ::= { hostTimeTable 1 }

          HostTimeEntry ::= SEQUENCE {
              hostTimeAddress              OCTET STRING,
              hostTimeCreationOrder        INTEGER (1..65535),
              hostTimeIndex                INTEGER (1..65535),
              hostTimeInPkts               Counter,
              hostTimeOutPkts              Counter,
              hostTimeInOctets             Counter,
              hostTimeOutOctets            Counter,
              hostTimeOutErrors            Counter,
              hostTimeOutBroadcastPkts     Counter,
              hostTimeOutMulticastPkts     Counter
          }

          hostTimeAddress OBJECT-TYPE
              SYNTAX OCTET STRING
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION

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                  "The physical address of this host."
              ::= { hostTimeEntry 1 }

          hostTimeCreationOrder OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "An index that uniquely identifies an entry in
                  the hostTime table among those entries associated
                  with the same hostControlEntry.  This index shall
                  be between 1 and N, where N is the value of
                  the associated hostControlTableSize.  The ordering
                  of the indexes is based on the order of each entry's
                  insertion into the table, in which entries added
                  earlier have a lower index value than entries added
                  later.  Thus the management station has the ability
                  to learn of new entries added to this table without
                  downloading the entire table.

                  It is important to note that the index for a
                  particular entry may change as an (earlier) entry
                  is deleted from the table.  Because this order may
                  change, management stations should make use of the
                  hostControlLastDeleteTime variable in the
                  hostControlEntry associated with the relevant
                  portion of the hostTimeTable.  By observing
                  this variable, the management station may detect
                  the circumstances where a download of the table
                  may have missed entries, and where a previous
                  association between a value of hostTimeCreationOrder
                  and a hostTimeEntry may no longer hold."
              ::= { hostTimeEntry 2 }

          hostTimeIndex OBJECT-TYPE
              SYNTAX INTEGER (1..65535)
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The set of collected host statistics of which
                  this entry is a part.  The set of hosts
                  identified by a particular value of this
                  index is associated with the hostControlEntry
                  as identified by the same value of hostControlIndex."
              ::= { hostTimeEntry 3 }


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