MIB:   IF-MIBMain Index
          
   - Textual Convention/Type Defs  (3)   - Notification/Trap Definitions  (2)
   - Object Identifier Definitions  (5)   - Object Group Definitions  (13)
   - Table Definitions  (5)   - Notification Group Definitions  (0)
   - Table Entry/Row Definitions  (5)   - Agent Capabilities Definitions  (0)
   - Column Object Definitions  (53)   - Module Compliance Definitions  (2)
   - Scalar Object Definitions  (3)     
                          
Module DependenciesMIB:  IF-MIB
 
     SNMPv2-TC
     IANAifType-MIB
 
                          
Module Identity: ifMIB1.3.6.1.2.1.31
 
 Last Updated
  
9611031355Z
 
 Organization
  
IETF Interfaces MIB Working Group
 
 Contact Info
  
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA  95134-1706
US

408-526-5260
kzm@cisco.com
 
 Description
  
The MIB module to describe generic objects for
network interface sub-layers.  This MIB is an updated
version of MIB-II's ifTable, and incorporates the
extensions defined in RFC 1229.
 
                          
Textual Convention (Type) DefinitionsMIB:  IF-MIB
 
 
  1) OwnerString  
  2) InterfaceIndex  
  3) InterfaceIndexOrZero  
 
 
   
 
OwnerString::=TEXTUAL CONVENTION
                  
Description:
  
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: ASCII form of the manager station's
transport address, management station name (e.g.,
domain name), network management personnel'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
'agent'.
 
Display Hint: "255a"
Syntax:   OCTET STRING (SIZE (0..255) )
 
 
InterfaceIndex::=TEXTUAL CONVENTION
                  
Description:
  
A unique value, greater than zero, for each interface
or interface sub-layer in the managed system.  It is
recommended that values are assigned contiguously
starting from 1.  The value for each interface sub-
layer must remain constant at least from one re-
initialization of the entity's network management
system to the next re-initialization.
 
Display Hint: "d"
Syntax:   Integer32 (1..2147483647)
 
 
InterfaceIndexOrZero::=TEXTUAL CONVENTION
                  
Description:
  
This textual convention is an extension of the
InterfaceIndex convention.  The latter defines a
greater than zero value used to identify an interface
or interface sub-layer in the managed system.  This
extension permits the additional value of zero.  the
value zero is object-specific and must therefore be
defined as part of the description of any object which
uses this syntax.  Examples of the usage of zero might
include situations where interface was unknown, or
when none or all interfaces need to be referenced.
 
Display Hint: "d"
Syntax:   Integer32 (0..2147483647)
 
                          
Object Identifier DefinitionsMIB:  IF-MIB
 
    
ifMIBObjects ::= ifMIB.11.3.6.1.2.1.31.1
interfaces ::= mib-2.21.3.6.1.2.1.2
ifConformance ::= ifMIB.21.3.6.1.2.1.31.2
ifGroups ::= ifConformance.11.3.6.1.2.1.31.2.1
ifCompliances ::= ifConformance.21.3.6.1.2.1.31.2.2
                          
Table DefinitionsMIB:  IF-MIB
 
 
  1) ifTable  
  2) ifXTable  
  3) ifStackTable  
  4) ifRcvAddressTable  
  5) ifTestTable  
 
 Table: ifTable1.3.6.1.2.1.2.2
   ( status | indexes | columns ) ( section | top )
 
 Description
  
A list of interface entries.  The number of entries
is given by the value of ifNumber.
 
  Status:   current
  Row Entry:  ifEntry
 
  Indexes:   
   
 #  Object  Type  OID 
1  ifIndex  Integer32  1.3.6.1.2.1.2.2.1.1
 
  Columns:  
   
 #  Object  Type  Syntax  Access  OID 
1  ifIndex i32InterfaceIndex ro 1.3.6.1.2.1.2.2.1.1
2  ifDescr sDisplayString ro 1.3.6.1.2.1.2.2.1.2
3  ifType iIANAifType ro 1.3.6.1.2.1.2.2.1.3
4  ifMtu i32Integer32 ro 1.3.6.1.2.1.2.2.1.4
5  ifSpeed g32Gauge32 ro 1.3.6.1.2.1.2.2.1.5
6  ifPhysAddress sPhysAddress ro 1.3.6.1.2.1.2.2.1.6
7  ifAdminStatus iINTEGER rw 1.3.6.1.2.1.2.2.1.7
8  ifOperStatus iINTEGER ro 1.3.6.1.2.1.2.2.1.8
9  ifLastChange tTimeTicks ro 1.3.6.1.2.1.2.2.1.9
10  ifInOctets c32Counter32 ro 1.3.6.1.2.1.2.2.1.10
11  ifInUcastPkts c32Counter32 ro 1.3.6.1.2.1.2.2.1.11
12  ifInNUcastPkts c32Counter32 ro 1.3.6.1.2.1.2.2.1.12
13  ifInDiscards c32Counter32 ro 1.3.6.1.2.1.2.2.1.13
14  ifInErrors c32Counter32 ro 1.3.6.1.2.1.2.2.1.14
15  ifInUnknownProtos c32Counter32 ro 1.3.6.1.2.1.2.2.1.15
16  ifOutOctets c32Counter32 ro 1.3.6.1.2.1.2.2.1.16
17  ifOutUcastPkts c32Counter32 ro 1.3.6.1.2.1.2.2.1.17
18  ifOutNUcastPkts c32Counter32 ro 1.3.6.1.2.1.2.2.1.18
19  ifOutDiscards c32Counter32 ro 1.3.6.1.2.1.2.2.1.19
20  ifOutErrors c32Counter32 ro 1.3.6.1.2.1.2.2.1.20
21  ifOutQLen g32Gauge32 ro 1.3.6.1.2.1.2.2.1.21
22  ifSpecific oOBJECT IDENTIFIER ro 1.3.6.1.2.1.2.2.1.22
 
 Table: ifXTable1.3.6.1.2.1.31.1.1
   ( status | indexes | columns ) ( section | top )
 
 Description
  
A list of interface entries.  The number of entries
is given by the value of ifNumber.  This table
contains additional objects for the interface table.
 
  Status:   current
  Row Entry:  ifXEntry
  Augments:  ifEntry
 
  Columns:  
   
 #  Object  Type  Syntax  Access  OID 
1  ifName sDisplayString ro 1.3.6.1.2.1.31.1.1.1.1
2  ifInMulticastPkts c32Counter32 ro 1.3.6.1.2.1.31.1.1.1.2
3  ifInBroadcastPkts c32Counter32 ro 1.3.6.1.2.1.31.1.1.1.3
4  ifOutMulticastPkts c32Counter32 ro 1.3.6.1.2.1.31.1.1.1.4
5  ifOutBroadcastPkts c32Counter32 ro 1.3.6.1.2.1.31.1.1.1.5
6  ifHCInOctets c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.6
7  ifHCInUcastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.7
8  ifHCInMulticastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.8
9  ifHCInBroadcastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.9
10  ifHCOutOctets c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.10
11  ifHCOutUcastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.11
12  ifHCOutMulticastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.12
13  ifHCOutBroadcastPkts c64Counter64 ro 1.3.6.1.2.1.31.1.1.1.13
14  ifLinkUpDownTrapEnable iINTEGER rw 1.3.6.1.2.1.31.1.1.1.14
15  ifHighSpeed g32Gauge32 ro 1.3.6.1.2.1.31.1.1.1.15
16  ifPromiscuousMode iTruthValue rw 1.3.6.1.2.1.31.1.1.1.16
17  ifConnectorPresent iTruthValue ro 1.3.6.1.2.1.31.1.1.1.17
18  ifAlias sDisplayString rw 1.3.6.1.2.1.31.1.1.1.18
19  ifCounterDiscontinuityTime tTimeStamp ro 1.3.6.1.2.1.31.1.1.1.19
 
 Table: ifStackTable1.3.6.1.2.1.31.1.2
   ( status | indexes | columns ) ( section | top )
 
 Description
  
The table containing information on the relationships
between the multiple sub-layers of network interfaces.
In particular, it contains information on which sub-
layers run 'on top of' which other sub-layers, where
each sub-layer corresponds to a conceptual row in the
ifTable.  For example, when the sub-layer with ifIndex
value x runs over the sub-layer with ifIndex value y,
then this table contains:

  ifStackStatus.x.y=active

For each ifIndex value, I, which identifies an active
interface, there are always at least two instantiated
rows in this table associated with I.  For one of
these rows, I is the value of ifStackHigherLayer; for
the other, I is the value of ifStackLowerLayer.  (If I
is not involved in multiplexing, then these are the
only two rows associated with I.)

For example, two rows exist even for an interface
which has no others stacked on top or below it:

  ifStackStatus.0.x=active
  ifStackStatus.x.0=active
 
  Status:   current
  Row Entry:  ifStackEntry
 
  Indexes:   
   
 #  Object  Type  OID 
1  ifStackHigherLayer  Integer32  1.3.6.1.2.1.31.1.2.1.1
2  ifStackLowerLayer  Integer32  1.3.6.1.2.1.31.1.2.1.2
 
  Columns:  
   
 #  Object  Type  Syntax  Access  OID 
1  ifStackHigherLayer i32Integer32 na 1.3.6.1.2.1.31.1.2.1.1
2  ifStackLowerLayer i32Integer32 na 1.3.6.1.2.1.31.1.2.1.2
3  ifStackStatus iRowStatus rc 1.3.6.1.2.1.31.1.2.1.3
 
 Table: ifRcvAddressTable1.3.6.1.2.1.31.1.4
   ( status | indexes | columns ) ( section | top )
 
 Description
  
This table contains an entry for each address
(broadcast, multicast, or uni-cast) for which the
system will receive packets/frames on a particular
interface, except as follows:

- for an interface operating in promiscuous mode,
entries are only required for those addresses for
which the system would receive frames were it not
operating in promiscuous mode.

- for 802.5 functional addresses, only one entry is
required, for the address which has the functional
address bit ANDed with the bit mask of all functional
addresses for which the interface will accept frames.

A system is normally able to use any unicast address
which corresponds to an entry in this table as a
source address.
 
  Status:   current
  Row Entry:  ifRcvAddressEntry
 
  Indexes:   
   
 #  Object  Type  OID 
1  ifIndex  Integer32  1.3.6.1.2.1.2.2.1.1
2  ifRcvAddressAddress  OCTET STRING  1.3.6.1.2.1.31.1.4.1.1
 
  Columns:  
   
 #  Object  Type  Syntax  Access  OID 
1  ifRcvAddressAddress sPhysAddress na 1.3.6.1.2.1.31.1.4.1.1
2  ifRcvAddressStatus iRowStatus rc 1.3.6.1.2.1.31.1.4.1.2
3  ifRcvAddressType iINTEGER rc 1.3.6.1.2.1.31.1.4.1.3
 
 Table: ifTestTable1.3.6.1.2.1.31.1.3
   ( status | indexes | columns ) ( section | top )
 
 Description
  
This table contains one entry per interface.  It
defines objects which allow a network manager to
instruct an agent to test an interface for various
faults.  Tests for an interface are defined in the
media-specific MIB for that interface.  After invoking
a test, the object ifTestResult can be read to
determine the outcome.  If an agent can not perform
the test, ifTestResult is set to so indicate.  The
object ifTestCode can be used to provide further
test-specific or interface-specific (or even
enterprise-specific) information concerning the
outcome of the test.  Only one test can be in progress
on each interface at any one time.  If one test is in
progress when another test is invoked, the second test
is rejected.  Some agents may reject a test when a
prior test is active on another interface.

Before starting a test, a manager-station must first
obtain 'ownership' of the entry in the ifTestTable for
the interface to be tested.  This is accomplished with
the ifTestId and ifTestStatus objects as follows:

try_again:
    get (ifTestId, ifTestStatus)
    while (ifTestStatus != notInUse)
        /*
         * Loop while a test is running or some other
         * manager is configuring a test.
         */
        short delay
        get (ifTestId, ifTestStatus)
    }

    /*
     * Is not being used right now -- let's compete
     * to see who gets it.
     */
    lock_value = ifTestId


    if ( set(ifTestId = lock_value, ifTestStatus = inUse,
             ifTestOwner = 'my-IP-address') == FAILURE)
        /*
         * Another manager got the ifTestEntry -- go
         * try again
         */
        goto try_again;

    /*
     * I have the lock
     */
    set up any test parameters.

    /*
     * This starts the test
     */
    set(ifTestType = test_to_run);

    wait for test completion by polling ifTestResult

    when test completes, agent sets ifTestResult
         agent also sets ifTestStatus = 'notInUse'

    retrieve any additional test results, and ifTestId

    if (ifTestId == lock_value+1) results are valid

  A manager station first retrieves the value of the
  appropriate ifTestId and ifTestStatus objects,
  periodically repeating the retrieval if necessary,
  until the value of ifTestStatus is 'notInUse'.  The
  manager station then tries to set the same ifTestId
  object to the value it just retrieved, the same
  ifTestStatus object to 'inUse', and the corresponding
  ifTestOwner object to a value indicating itself.  If
  the set operation succeeds then the manager has
  obtained ownership of the ifTestEntry, and the value of
  the ifTestId object is incremented by the agent (per
  the semantics of TestAndIncr).  Failure of the set
  operation indicates that some other manager has
  obtained ownership of the ifTestEntry.

  Once ownership is obtained, any test parameters can be
  setup, and then the test is initiated by setting
  ifTestType.  On completion of the test, the agent sets
  ifTestStatus to 'notInUse'.  Once this occurs, the
  manager can retrieve the results.  In the (rare) event
  that the invocation of tests by two network managers
  were to overlap, then there would be a possibility that
  the first test's results might be overwritten by the
  second test's results prior to the first results being
  read.  This unlikely circumstance can be detected by a
  network manager retrieving ifTestId at the same time as
  retrieving the test results, and ensuring that the
  results are for the desired request.

  If ifTestType is not set within an abnormally long
  period of time after ownership is obtained, the agent
  should time-out the manager, and reset the value of the
  ifTestStatus object back to 'notInUse'.  It is
  suggested that this time-out period be 5 minutes.

  In general, a management station must not retransmit a
  request to invoke a test for which it does not receive
  a response; instead, it properly inspects an agent's
  MIB to determine if the invocation was successful.
  Only if the invocation was unsuccessful, is the
  invocation request retransmitted.

  Some tests may require the interface to be taken off-
  line in order to execute them, or may even require the
  agent to reboot after completion of the test.  In these
  circumstances, communication with the management
  station invoking the test may be lost until after
  completion of the test.  An agent is not required to
  support such tests.  However, if such tests are
  supported, then the agent should make every effort to
  transmit a response to the request which invoked the
  test prior to losing communication.  When the agent is
  restored to normal service, the results of the test are
  properly made available in the appropriate objects.
  Note that this requires that the ifIndex value assigned
  to an interface must be unchanged even if the test
  causes a reboot.  An agent must reject any test for
  which it cannot, perhaps due to resource constraints,
  make available at least the minimum amount of
  information after that test completes.
 
  Status:   deprecated
  Row Entry:  ifTestEntry
  Augments:  ifEntry
 
  Columns:  
   
 #  Object  Type  Syntax  Access  OID 
1  ifTestId iTestAndIncr rw 1.3.6.1.2.1.31.1.3.1.1
2  ifTestStatus iINTEGER rw 1.3.6.1.2.1.31.1.3.1.2
3  ifTestType oAutonomousType rw 1.3.6.1.2.1.31.1.3.1.3
4  ifTestResult iINTEGER ro 1.3.6.1.2.1.31.1.3.1.4
5  ifTestCode oOBJECT IDENTIFIER ro 1.3.6.1.2.1.31.1.3.1.5
6  ifTestOwner sOwnerString rw 1.3.6.1.2.1.31.1.3.1.6
 
                          
Table Row/Entry Object DefinitionsMIB:  IF-MIB
 
 
  1) ifEntry  
  2) ifXEntry  
  3) ifStackEntry  
  4) ifRcvAddressEntry  
  5) ifTestEntry  
 
 Entry Object:   ifEntry1.3.6.1.2.1.2.2.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
An entry containing management information applicable
to a particular interface.
 
  Table:  ifTable
  Status:   current
  Access:   not-accessible
 
  Type:   SEQUENCE
  Syntax:   SEQUENCE
 
 Entry Object:   ifXEntry1.3.6.1.2.1.31.1.1.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
An entry containing additional management information
applicable to a particular interface.
 
  Table:  ifXTable
  Status:   current
  Access:   not-accessible
 
  Type:   SEQUENCE
  Syntax:   SEQUENCE
 
 Entry Object:   ifStackEntry1.3.6.1.2.1.31.1.2.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
Information on a particular relationship between two
sub-layers, specifying that one sub-layer runs on
'top' of the other sub-layer.  Each sub-layer
corresponds to a conceptual row in the ifTable.
 
  Table:  ifStackTable
  Status:   current
  Access:   not-accessible
 
  Type:   SEQUENCE
  Syntax:   SEQUENCE
 
 Entry Object:   ifRcvAddressEntry1.3.6.1.2.1.31.1.4.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
A list of objects identifying an address for which
the system will accept packets/frames on the
particular interface identified by the index value
ifIndex.
 
  Table:  ifRcvAddressTable
  Status:   current
  Access:   not-accessible
 
  Type:   SEQUENCE
  Syntax:   SEQUENCE
 
 Entry Object:   ifTestEntry1.3.6.1.2.1.31.1.3.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
An entry containing objects for invoking tests on an
interface.
 
  Table:  ifTestTable
  Status:   deprecated
  Access:   not-accessible
 
  Type:   SEQUENCE
  Syntax:   SEQUENCE
 
<
                          
Table Column Object DefinitionsMIB:  IF-MIB
 
 
  1) ifIndex  
  2) ifDescr  
  3) ifType  
  4) ifMtu  
  5) ifSpeed  
  6) ifPhysAddress  
  7) ifAdminStatus  
  8) ifOperStatus  
  9) ifLastChange  
  10) ifInOctets  
  11) ifInUcastPkts  
  12) ifInNUcastPkts  
  13) ifInDiscards  
  14) ifInErrors  
  15) ifInUnknownProtos  
  16) ifOutOctets  
  17) ifOutUcastPkts  
  18) ifOutNUcastPkts  
  19) ifOutDiscards  
  20) ifOutErrors  
  21) ifOutQLen  
  22) ifSpecific  
  23) ifName  
  24) ifInMulticastPkts  
  25) ifInBroadcastPkts  
  26) ifOutMulticastPkts  
  27) ifOutBroadcastPkts  
  28) ifHCInOctets  
  29) ifHCInUcastPkts  
  30) ifHCInMulticastPkts  
  31) ifHCInBroadcastPkts  
  32) ifHCOutOctets  
  33) ifHCOutUcastPkts  
  34) ifHCOutMulticastPkts  
  35) ifHCOutBroadcastPkts  
  36) ifLinkUpDownTrapEnable  
  37) ifHighSpeed  
  38) ifPromiscuousMode  
  39) ifConnectorPresent  
  40) ifAlias  
  41) ifCounterDiscontinuityTime  
  42) ifStackHigherLayer  
  43) ifStackLowerLayer  
  44) ifStackStatus  
  45) ifRcvAddressAddress  
  46) ifRcvAddressStatus  
  47) ifRcvAddressType  
  48) ifTestId  
  49) ifTestStatus  
  50) ifTestType  
  51) ifTestResult  
  52) ifTestCode  
  53) ifTestOwner  
 
 Column Object:   ifIndex1.3.6.1.2.1.2.2.1.1
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
A unique value, greater than zero, for each
interface.  It is recommended that values are assigned
contiguously starting from 1.  The value for each
interface sub-layer must remain constant at least from
one re-initialization of the entity's network
management system to the next re-initialization.
 
  Table: ifTable
  Indexing:  ifTable, ifRcvAddressTable
  Status:   current
  Access:   read-only
 
  Type:   Integer32
  Syntax:   IF-MIB.InterfaceIndex
 
 Column Object:   ifDescr1.3.6.1.2.1.2.2.1.2
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
A textual string containing information about the
interface.  This string should include the name of the
manufacturer, the product name and the version of the
interface hardware/software.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   OCTET STRING
  Syntax:   SNMPv2-TC.DisplayString (SIZE (0..255) )
 
 Column Object:   ifType1.3.6.1.2.1.2.2.1.3
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The type of interface.  Additional values for ifType
are assigned by the Internet Assigned Numbers
Authority (IANA), through updating the syntax of the
IANAifType textual convention.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   INTEGER
  Syntax:   IANAifType-MIB.IANAifType
 
 Column Object:   ifMtu1.3.6.1.2.1.2.2.1.4
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The size of the largest packet which can be
sent/received on the interface, specified in octets.
For interfaces that are used for transmitting network
datagrams, this is the size of the largest network
datagram that can be sent on the interface.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Integer32
  Syntax:   Integer32
 
 Column Object:   ifSpeed1.3.6.1.2.1.2.2.1.5
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
An estimate of the interface's current bandwidth in
bits per second.  For interfaces which do not vary in
bandwidth or for those where no accurate estimation
can be made, this object should contain the nominal
bandwidth.  If the bandwidth of the interface is
greater than the maximum value reportable by this
object then this object should report its maximum
value (4,294,967,295) and ifHighSpeed must be used to
report the interace's speed.  For a sub-layer which
has no concept of bandwidth, this object should be
zero.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Gauge32
  Syntax:   Gauge32
 
 Column Object:   ifPhysAddress1.3.6.1.2.1.2.2.1.6
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The interface's address at its protocol sub-layer.
For example, for an 802.x interface, this object
normally contains a MAC address.  The interface's
media-specific MIB must define the bit and byte
ordering and the format of the value of this object.
For interfaces which do not have such an address
(e.g., a serial line), this object should contain an
octet string of zero length.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   OCTET STRING
  Syntax:   SNMPv2-TC.PhysAddress
 
 Column Object:   ifAdminStatus1.3.6.1.2.1.2.2.1.7
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The desired state of the interface.  The testing(3)
state indicates that no operational packets can be
passed.  When a managed system initializes, all
interfaces start with ifAdminStatus in the down(2)
state.  As a result of either explicit management
action or per configuration information retained by
the managed system, ifAdminStatus is then changed to
either the up(1) or testing(3) states (or remains in
the down(2) state).
 
  Table: ifTable
  Status:   current
  Access:   read-write
 
  Type:   INTEGER
  Syntax:   INTEGER
{   
 up(1),
 down(2),
 testing(3)
} 
 
 Column Object:   ifOperStatus1.3.6.1.2.1.2.2.1.8
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The current operational state of the interface.  The
testing(3) state indicates that no operational packets
can be passed.  If ifAdminStatus is down(2) then
ifOperStatus should be down(2).  If ifAdminStatus is
changed to up(1) then ifOperStatus should change to
up(1) if the interface is ready to transmit and
receive network traffic; it should change to
dormant(5) if the interface is waiting for external
actions (such as a serial line waiting for an incoming
connection); it should remain in the down(2) state if
and only if there is a fault that prevents it from
going to the up(1) state; it should remain in the
notPresent(6) state if the interface has missing
(typically, hardware) components.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   INTEGER
  Syntax:   INTEGER
{   
 up(1),
 down(2),
 testing(3),
 unknown(4),
 dormant(5),
 notPresent(6),
 lowerLayerDown(7)
} 
 
 Column Object:   ifLastChange1.3.6.1.2.1.2.2.1.9
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The value of sysUpTime at the time the interface
entered its current operational state.  If the current
state was entered prior to the last re-initialization
of the local network management subsystem, then this
object contains a zero value.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   TimeTicks
  Syntax:   TimeTicks
 
 Column Object:   ifInOctets1.3.6.1.2.1.2.2.1.10
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The total number of octets received on the interface,
including framing characters.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifInUcastPkts1.3.6.1.2.1.2.2.1.11
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The number of packets, delivered by this sub-layer to
a higher (sub-)layer, which were not addressed to a
multicast or broadcast address at this sub-layer.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifInNUcastPkts1.3.6.1.2.1.2.2.1.12
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The number of packets, delivered by this sub-layer to
a higher (sub-)layer, which were addressed to a
multicast or broadcast address at this sub-layer.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.

This object is deprecated in favour of
ifInMulticastPkts and ifInBroadcastPkts.
 
  Table: ifTable
  Status:   deprecated
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifInDiscards1.3.6.1.2.1.2.2.1.13
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The number of inbound packets which were chosen to be
discarded even though no errors had been detected to
prevent their being deliverable to a higher-layer
protocol.  One possible reason for discarding such a
packet could be to free up buffer space.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifInErrors1.3.6.1.2.1.2.2.1.14
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
For packet-oriented interfaces, the number of inbound
packets that contained errors preventing them from
being deliverable to a higher-layer protocol.  For
character-oriented or fixed-length interfaces, the
number of inbound transmission units that contained
errors preventing them from being deliverable to a
higher-layer protocol.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifInUnknownProtos1.3.6.1.2.1.2.2.1.15
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
For packet-oriented interfaces, the number of packets
received via the interface which were discarded
because of an unknown or unsupported protocol.  For
character-oriented or fixed-length interfaces that
support protocol multiplexing the number of
transmission units received via the interface which
were discarded because of an unknown or unsupported
protocol.  For any interface that does not support
protocol multiplexing, this counter will always be 0.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifOutOctets1.3.6.1.2.1.2.2.1.16
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The total number of octets transmitted out of the
interface, including framing characters.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifOutUcastPkts1.3.6.1.2.1.2.2.1.17
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The total number of packets that higher-level
protocols requested be transmitted, and which were not
addressed to a multicast or broadcast address at this
sub-layer, including those that were discarded or not
sent.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
 
  Table: ifTable
  Status:   current
  Access:   read-only
 
  Type:   Counter32
  Syntax:   Counter32
 
 Column Object:   ifOutNUcastPkts1.3.6.1.2.1.2.2.1.18
   ( status | access | type | syntax ) ( section | top )
 
 Description
  
The total number of packets that higher-level
protocols requested be transmitted, and which were
addressed to a multicast or broadcast address at this
sub-layer, including those that were discarded or not
sent.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime.
This object is deprecated in favour of
ifOutMulticastPkts and ifOutBroadcastPkts.
 
  Table: ifTable
  Status:   deprecated
  Access:   read-only
 
  Type: