rfc1757.txt

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                  FCS octets).

                  This object can be used as a reasonable estimate of
                  ethernet utilization.  If greater precision is
                  desired, the etherStatsPkts and etherStatsOctets
                  objects should be sampled before and after a common
                  interval.  The differences in the sampled values are
                  Pkts and Octets, respectively, and the number of
                  seconds in the interval is Interval.  These values
                  are used to calculate the Utilization as follows:

                                   Pkts * (9.6 + 6.4) + (Octets * .8)
                   Utilization = -------------------------------------
                                           Interval * 10,000

                  The result of this equation is the value Utilization
                  which is the percent utilization of the ethernet
                  segment on a scale of 0 to 100 percent."
              ::= { etherStatsEntry 4 }

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

          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.  Note that this
                  does not include multicast packets."
              ::= { 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."



Waldbusser                                                     [Page 17]

RFC 1757             Remote Network Monitoring MIB         February 1995


              ::= { 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 but had either a bad
                  Frame Check Sequence (FCS) with an integral
                  number of octets (FCS Error) or a bad FCS with
                  a non-integral number of octets (Alignment Error)."
              ::= { 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
              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 less
                  than 64 octets in length (excluding framing bits but
                  including FCS octets) and had either a bad Frame
                  Check Sequence (FCS) with an integral number of
                  octets (FCS Error) or a bad FCS with a non-integral



Waldbusser                                                     [Page 18]

RFC 1757             Remote Network Monitoring MIB         February 1995


                  number of octets (Alignment Error).

                  Note that it is entirely normal for
                  etherStatsFragments to increment.  This is because
                  it counts both runts (which are normal occurrences
                  due to collisions) and noise hits."
              ::= { 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 had either a bad
                  Frame Check Sequence (FCS) with an integral number
                  of octets (FCS Error) or a bad FCS with a
                  non-integral number of octets (Alignment Error).

                  Note that this definition of jabber is different
                  than the definition in IEEE-802.3 section 8.2.1.5
                  (10BASE5) and section 10.3.1.4 (10BASE2).  These
                  documents define jabber as the condition where any
                  packet exceeds 20 ms.  The allowed range to detect
                  jabber is between 20 ms and 150 ms."
              ::= { 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.

                  The value returned will depend on the location of
                  the RMON probe. Section 8.2.1.3 (10BASE-5) and
                  section 10.3.1.3 (10BASE-2) of IEEE standard 802.3
                  states that a station must detect a collision, in
                  the receive mode, if three or more stations are
                  transmitting simultaneously.  A repeater port must
                  detect a collision when two or more stations are
                  transmitting simultaneously.  Thus a probe placed on
                  a repeater port could record more collisions than a
                  probe connected to a station on the same segment
                  would.




Waldbusser                                                     [Page 19]

RFC 1757             Remote Network Monitoring MIB         February 1995


                  Probe location plays a much smaller role when
                  considering 10BASE-T.  14.2.1.4 (10BASE-T) of IEEE
                  standard 802.3 defines a collision as the
                  simultaneous presence of signals on the DO and RD
                  circuits (transmitting and receiving at the same
                  time).  A 10BASE-T station can only detect
                  collisions when it is transmitting.  Thus probes
                  placed on a station and a repeater, should report
                  the same number of collisions.

                  Note also that an RMON probe inside a repeater
                  should ideally report collisions between the
                  repeater and one or more other hosts (transmit
                  collisions as defined by IEEE 802.3k) plus receiver
                  collisions observed on any coax segments to which
                  the repeater is connected."
              ::= { etherStatsEntry 13 }

          etherStatsPkts64Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including bad
                  packets) received that were 64 octets in length
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 14 }

          etherStatsPkts65to127Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including bad
                  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 bad
                  packets) received that were between
                  128 and 255 octets in length inclusive
                  (excluding framing bits but including FCS octets)."



Waldbusser                                                     [Page 20]

RFC 1757             Remote Network Monitoring MIB         February 1995


              ::= { etherStatsEntry 16 }

          etherStatsPkts256to511Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including bad
                  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 bad
                  packets) received that were between
                  512 and 1023 octets in length inclusive
                  (excluding framing bits but including FCS octets)."
              ::= { etherStatsEntry 18 }

          etherStatsPkts1024to1518Octets OBJECT-TYPE
              SYNTAX Counter
              ACCESS read-only
              STATUS mandatory
              DESCRIPTION
                  "The total number of packets (including bad
                  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



Waldbusser                                                     [Page 21]

RFC 1757             Remote Network Monitoring MIB         February 1995


              DESCRIPTION
                  "The status of this etherStats entry."
              ::= { etherStatsEntry 21 }


          -- The History Control Group

          -- Implementation of the History Control group is optional.
          --
          -- The history control group controls the periodic statistical
          -- sampling of data from various types of networks.  The
          -- historyControlTable 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.  Each counter in the
          -- etherHistoryEntry counts the same event as its