rfc2665.txt

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3.2.5.  ifPhysAddress

   This object contains the IEEE 802.3 address which is placed in the
   source-address field of any Ethernet, Starlan, or IEEE 802.3 frames
   that originate at this interface.  Usually this will be kept in ROM
   on the interface hardware.  Some systems may set this address via
   software.

   In a system where there are several such addresses the designer has a
   tougher choice.  The address chosen should be the one most likely to
   be of use to network management (e.g.  the address placed in ARP
   responses for systems which are primarily IP systems).

   If the designer truly can not chose, use of the factory- provided ROM
   address is suggested.

   If the address can not be determined, an octet string of zero length
   should be returned.

   The address is stored in binary in this object.  The address is
   stored in "canonical" bit order, that is, the Group Bit is positioned
   as the low-order bit of the first octet.  Thus, the first byte of a
   multicast address would have the bit 0x01 set.

3.2.6.  ifType

   This MIB applies to interfaces which have any of the following ifType
   values:

            ethernetCsmacd(6)
            iso88023Csmacd(7)
            starLan(11)






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   It is RECOMMENDED that all Ethernet-like interfaces use an ifType of
   ethernetCsmacd(6) regardless of the speed that the interface is
   running or the link-layer encapsulation in use.  iso88023Csmacd(7)
   and starLan(11) are supported for backwards compatability.

   There are three other interface types defined in the IANAifType-MIB
   for Ethernet.  They are fastEther(62), fastEtherFX(69), and
   gigabitEthernet(117).  This document takes the position that an
   Ethernet is an Ethernet, and Ethernet interfaces SHOULD always have
   the same value of ifType.  Information on the particular flavor of
   Ethernet that an interface is running is available from ifSpeed in
   the Interfaces MIB, and ifMauType in the 802.3 MAU MIB.  An
   Ethernet-like interface SHOULD NOT use the fastEther(62),
   fastEtherFX(69), or gigabitEthernet(117) ifTypes.

   Interfaces with any of the supported ifType values map to the
   EtherLike-MIB in the same manner.  There are no implementation
   differences.

3.2.7.  Specific Interface MIB Objects

   The following table provides specific implementation guidelines for
   applying the interface group objects to ethernet-like media.

      Object                     Guidelines

      ifIndex                    Each ethernet-like interface is
                                 represented by an ifEntry.  The
                                 dot3StatsTable in this MIB module is
                                 indexed by dot3StatsIndex. The interface
                                 identified by a particular value of
                                 dot3StatsIndex is the same interface as
                                 identified by the same value of ifIndex.

      ifDescr                    Refer to [25].

      ifType                     Refer to section 3.2.6.

      ifMtu                      1500 octets.  NOTE: This is the MTU as
                                 seen by the MAC client.  When a higher
                                 layer protocol, like IP, is running over
                                 Ethernet, this is the MTU that will be
                                 seen by that higher layer protocol.
                                 However, when using the IEEE 802.2 LLC
                                 protocol, higher layer protocols will
                                 see a different MTU.  In particular, an
                                 LLC type 1 client protocol will see




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                                 an MTU of 1497 octets, and a protocol
                                 running over SNAP will see an MTU of
                                 1492 octets.

      ifSpeed                    The current operational speed of the
                                 interface in bits per second. For
                                 current ethernet-like interfaces, this
                                 will be equal to 1,000,000 (1 million),
                                 10,000,000 (10 million), 100,000,000
                                 (100 million), or 1,000,000,000 (1
                                 billion). If the interface implements
                                 auto-negotiation, auto-negotiation is
                                 enabled for this interface, and the
                                 interface has not yet negotiated to an
                                 operational speed, this object SHOULD
                                 reflect the maximum speed supported by
                                 the interface.  Note that this object
                                 MUST NOT indicate a doubled value when
                                 operating in full-duplex mode.  It MUST
                                 indicate the correct line speed
                                 regardless of the current duplex mode.
                                 The duplex mode of the interface may
                                 be determined by examining either the
                                 dot3StatsDuplexStatus object in this
                                 MIBmodule, or the ifMauType object in
                                 the 802.3 MAU MIB.

      ifPhysAddress              Refer to section 3.2.5.

      ifAdminStatus              Write access is not required.  Support
                                 for 'testing' is not required.

      ifOperStatus               The operational state of the interface.
                                 Support for 'testing' is not required.
                                 The value 'dormant' has no meaning for
                                 an ethernet-like interface.

      ifLastChange               Refer to [25].

      ifInOctets                 The number of octets in valid MAC
                                 frames received on this interface,
                                 including the MAC header and FCS.
                                 This does include the number of octets
                                 in valid MAC Control frames received on
                                 this interface.






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      ifInUcastPkts              Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are consumed by the
                                 interface layer and are not passed to
                                 any higher layer protocol.

      ifInDiscards               Refer to [25].

      ifInErrors                 The sum for this interface of
                                 dot3StatsAlignmentErrors,
                                 dot3StatsFCSErrors,
                                 dot3StatsFrameTooLongs,
                                 dot3StatsInternalMacReceiveErrors and
                                 dot3StatsSymbolErrors.

      ifInUnknownProtos          Refer to [25].

      ifOutOctets                The number of octets transmitted in
                                 valid MAC frames on this interface,
                                 including the MAC header and FCS.
                                 This does include the number of octets
                                 in valid MAC Control frames transmitted
                                 on this interface.

      ifOutUcastPkts             Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are generated by the
                                 interface layer, and are not passed
                                 from any higher layer protocol.

      ifOutDiscards              Refer to [25].

      ifOutErrors                The sum for this interface of:
                                 dot3StatsSQETestErrors,
                                 dot3StatsLateCollisions,
                                 dot3StatsExcessiveCollisions,
                                 dot3StatsInternalMacTransmitErrors and
                                 dot3StatsCarrierSenseErrors.

      ifName                     Locally-significant textual name for
                                 the interface (e.g. lan0).

      ifInMulticastPkts          Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are consumed by the
                                 interface layer and are not passed to
                                 any higher layer protocol.




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      ifInBroadcastPkts          Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are generated by
                                 the interface layer, and are not passed
                                 from any higher layer protocol.

      ifOutMulticastPkts         Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are consumed by the
                                 interface layer and are not passed to
                                 any higher layer protocol.

      ifOutBroadcastPkts         Refer to [25].  Note that this does
                                 not include MAC Control frames, since
                                 MAC Control frames are generated by
                                 the interface layer, and are not passed
                                 from any higher layer protocol.

      ifHCInOctets               64-bit versions of counters.  Required
      ifHCOutOctets              for ethernet-like interfaces that are
                                 capable of operating at 20Mbit/sec or
                                 faster, even if the interface is
                                 currently operating at less than
                                 20Mbit/sec.

      ifHCInUcastPkts            64-bit versions of packet counters.
      ifHCInMulticastPkts        Required for ethernet-like interfaces
      ifHCInBroadcastPkts        that are capable of operating at
      ifHCOutUcastPkts           640Mbit/sec or faster, even if the
      ifHCOutMulticastPkts       interface is currently operating at
      ifHCOutBroadcastPkts       less than 640Mbit/sec.

      ifLinkUpDownTrapEnable     Refer to [25].  Default is 'enabled'

      ifHighSpeed                The current operational speed of the
                                 interface in millions of bits per
                                 second. For current ethernet-like
                                 interfaces, this will be equal to 1,
                                 10, 100, or 1,000.  If the interface
                                 implements auto-negotiation,
                                 auto-negotiation is enabled for this
                                 interface, and the interface has not
                                 yet negotiated to an operational speed,
                                 this object SHOULD reflect the maximum
                                 speed supported by the interface. Note
                                 that this object MUST NOT indicate a
                                 doubled value when operating in full-
                                 duplex mode.  It MUST indicate the



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                                 correct line speed regardless of the
                                 current duplex mode. The duplex mode
                                 of the interface may be determined
                                 by examining either the
                                 dot3StatsDuplexStatus object in this
                                 MIB module, or the ifMauType object in
                                 the 802.3 MAU MIB.

      ifPromiscuousMode          Refer to [25].

      ifConnectorPresent         This will normally be 'true'.

      ifAlias                    Refer to [25].

      ifCounterDiscontinuityTime Refer to [25].  Note that a
                                 discontinuity in the Interface MIB
                                 counters may also indicate a
                                 discontinuity in some or all of the
                                 counters in this MIB that are
                                 associated with that interface.

      ifStackHigherLayer         Refer to section 3.2.1.
      ifStackLowerLayer
      ifStackStatus

      ifRcvAddressAddress        Refer to section 3.2.4.
      ifRcvAddressStatus
      ifRcvAddressType

3.3.  Relation to the 802.3 MAU MIB