rfc2127.txt

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   Mapping of B channels to upper interface layers is usually done using
   the Dial Control MIB. For example, mapping on top of B channels might
   look as follows:

+-------------------------------------------------------+
|               Network Layer Protocol                  |
+------+ +-------+ +-------+ +-------+ +-------+ +------+
       | |       | |       | |       | |       | | <== appears active
     +-+ +-+   +-+ +-+   +-+ +-+   +-+ +-+   +-+ +-+
     | PPP |   | PPP |   | F/R |   | PPP |   | F/R |
     | for |   | for |   | for |   | for |   | for |   ifEntry with
     |Peer1|   |Peer2|   |switch   |Peer3|   |switch   shadow PeerEntry
     |     |   |     |   |  A  |   |     |   |  B  |
     +-+ +-+   +-+ +-+   +-+ +-+   +-+ +-+   +-+ +-+
                 | |                 | |           <== some actually are
    +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+
    |   B   | |   B   | |   B   | |   B   | |   B   |
    |channel| |channel| |channel| |channel| |channel|
    +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+
       | |       | |       | |       | |       | |
+------+ +-------+ +-------+ +-------+ +-------+ +------+
|             Basic/Primary Rate Interface              |
+-------------------------------------------------------+

   Mapping of IP interfaces to Called Peers to B Channels






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RFC 2127                        ISDN MIB                      March 1997


   In this model, ifEntries are maintained for each peer.  Each peer is
   required to have an associated ifEntry.  This interface can be of any
   kind, e.g. PPP or LAPB.

   The Dial Control MIB can be used for all types of demand-access
   interfaces, e.g., ISDN, modems or X.25 virtual connections.

3.2.2.  ifTestTable

   The ifTestTable is not supported by this MIB.

3.2.3.  ifRcvAddressTable

   The ifRcvAddressTable is not supported by this MIB.

3.2.4.  ifEntry

3.2.4.1.  ifEntry for a Basic Rate hardware interface

   The ifGeneralGroup is supported for Basic Rate hardware interfaces.

   ifTable           Comments
   ==============    ===========================================
   ifIndex           Each ISDN Basic Rate hardware interface is
                     represented by an ifEntry.

   ifDescr           Textual port description.

   ifType            The IANA value of isdns(75) or isdnu(76),
                     whichever is appropriate.

   ifSpeed           The overall bandwidth of this interface.

   ifPhysAddress     Return an empty string.

   ifAdminStatus     The administrative status of the ISDN interface.

   ifOperStatus      The current operational status of this interface.
                     The operational status is dormant(5) if
                     the interface is in standby mode, i.e. connected
                     to the network, but without call activity.
                     The operational status is down(2) if the hardware
                     has detected that there is no layer 1 connection
                     to the switch.
                     For other values, refer to the Interfaces MIB.

   ifLastChange      Refer to the Interfaces MIB.




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RFC 2127                        ISDN MIB                      March 1997


   ifLinkUpDownTrapEnable
                     Refer to the Interfaces MIB.

   ifConnectorPresent
                     Refer to the Interfaces MIB.

   ifHighSpeed       Return zero.

   ifName            Refer to the Interfaces MIB.

3.2.4.2.  ifEntry for a B channel

   The ifEntry for a B channel supports the ifGeneralGroup of the
   Interfaces MIB.

   ifTable           Comments
   ==============    ===========================================
   ifIndex           Each ISDN B channel is represented by an ifEntry.

   ifDescr           Textual port description.

   ifType            The IANA value of ds0(81).

   ifSpeed           The bandwidth of this B channel.
                     Usually, this is the value of 56000 or 64000.

   ifPhysAddress     Return an empty string.

   ifAdminStatus     The administrative status of this interface.

   ifOperStatus      The current operational status of this interface.
                     Note that dormant(5) is explicitly being used
                     as defined in the Interfaces MIB.
                     For other values, refer to the Interfaces MIB.

   ifLastChange      Refer to the Interfaces MIB.

   ifLinkUpDownTrapEnable
                     Refer to the Interfaces MIB.

   ifConnectorPresent
                     Refer to the Interfaces MIB.

   ifHighSpeed       Return zero.

   ifName            Refer to the Interfaces MIB.





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RFC 2127                        ISDN MIB                      March 1997


3.2.4.3.  ifEntry for LAPD (D channel Data Link Layer)

   The ifEntry for LAPD (D channel Data Link Layer) supports the
   ifGeneralGroup and the ifPacketGroup of the Interfaces MIB.

   ifTable           Comments
   ==============    ===========================================
   ifIndex           Each ISDN D channel Data Link layer is represented
                     by an ifEntry.

   ifDescr           Textual port description.

   ifType            The IANA value of lapd(77).

   ifSpeed           The bandwidth of this interface. Usually, this is
                     the value of 16000 for basic rate interfaces or
                     64000 for primary rate interfaces.

   ifPhysAddress     Return an empty string.

   ifAdminStatus     The administrative status of this interface.

   ifOperStatus      The current operational status of the ISDN
                     LAPD interface. The operational status is
                     dormant(5) if the interface is in standby mode
                     (see Q.931 [8], Annex F, D channel backup
                     procedures).
                     For other values, refer to the Interfaces MIB.

   ifLastChange      Refer to the Interfaces MIB.

   ifLinkUpDownTrapEnable
                     Refer to the Interfaces MIB.

   ifConnectorPresent
                     Refer to the Interfaces MIB.

   ifHighSpeed       Return zero.

   ifName            Refer to the Interfaces MIB.

   ifMtu             The size of the largest frame which can be
                     sent/received on this interface,
                     specified in octets. Usually, this is the
                     default value of 260 as specified in Q.921
                     [6], chapter 5.9.3.





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RFC 2127                        ISDN MIB                      March 1997


   ifInOctets        The total number of octets received on this
                     interface.

   ifInUcastPkts     The number of frames received on this interface
                     whose address is not TEI=127.

   ifInNUcastPkts    Deprecated.  Return the number of frames
                     received on this interface with TEI=127.

   ifInMulticastPkts Return zero.

   ifInBroadcastPkts Return the number of frames received
                     on this interface with TEI=127.

   ifInDiscards      The total number of received frames which have
                     been discarded.
                     The possible reasons are: buffer shortage.

   ifInErrors        The number of inbound frames that contained
                     errors preventing them from being deliverable
                     to LAPD.

   ifInUnknownProtos The number of frames with known TEI, but unknown
                     SAPI (Service Access Point Identifier,
                     see Q.921 [6], chapter 3.3.3).

   ifOutOctets       The total number of octets transmitted on this
                     interface.

   ifOutUcastPkts    The number of frames transmitted on this
                     interface whose address is not TEI=127.

   ifOutNUcastPkts   Deprecated.  Return the number of frames
                     transmitted on this interface with TEI=127.

   ifOutMulticastPkts
                     Return zero.

   ifOutBroadcastPkts
                     Return the number of frames transmitted
                     on this interface with TEI=127.

   ifOutDiscards     The total number of outbound frames which
                     were discarded. Possible reasons are:
                     buffer shortage.

   ifOutErrors       The number of frames which could not be
                     transmitted due to errors.



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RFC 2127                        ISDN MIB                      March 1997


   ifOutQlen         Deprecated. Return zero.

   ifSpecific        Deprecated. Return {0 0}.

3.2.4.4.  ifEntry for a signaling channel

   The ifEntry for a signaling channel supports the ifGeneralGroup and
   the ifPacketGroup of the Interfaces MIB.

   ifTable           Comments
   ==============    ===========================================
   ifIndex           Each ISDN signaling channel is represented by
                     an ifEntry.

   ifDescr           Textual port description.

   ifType            The IANA value of isdn(63).

   ifSpeed           The bandwidth of this signaling channel. Usually,
                     this is the same value as for LAPD, i.e. 16000
                     for basic rate interfaces or 64000 for primary rate
                     interfaces.

   ifPhysAddress     The ISDN address assigned to this signaling channel.
                     This is a copy of isdnSignalingCallingAddress.

   ifAdminStatus     The administrative status of the signaling channel.

   ifOperStatus      The current operational status of this signaling
                     channel. The operational status is dormant(5) if
                     the signaling channel is currently not activated.
                     For other values, refer to the Interfaces MIB.

   ifLastChange      Refer to the Interfaces MIB.

   ifLinkUpDownTrapEnable
                     Refer to the Interfaces MIB.

   ifConnectorPresent
                     Refer to the Interfaces MIB.

   ifHighSpeed       Return zero.

   ifName            Refer to the Interfaces MIB.







Roeck                      Standards Track                     [Page 12]

RFC 2127                        ISDN MIB                      March 1997


   ifMtu             The size of the largest frame which can be
                     sent/received on this signaling channel,
                     specified in octets. Usually, this is the
                     default value of 260 as specified in Q.921
                     [6], chapter 5.9.3.

   ifInOctets        The total number of octets received on this
                     signaling channel.

   ifInUcastPkts     The number of frames received which are targeted
                     to this channel.

   ifInNUcastPkts    Deprecated.  Return the number of frames
                     received on this signaling channel with TEI=127.

   ifInMulticastPkts Return zero.

   ifInBroadcastPkts Return the number of frames received
                     on this signaling channel with TEI=127.

   ifInDiscards      The total number of received frames which have been
                     discarded.
                     The possible reasons are: buffer shortage.

   ifInErrors        The number of inbound frames that contained
                     errors preventing them from being deliverable
                     to the signaling channel.

   ifInUnknownProtos Return zero.

   ifOutOctets       The total number of octets transmitted on this
                     signaling channel.

   ifOutUcastPkts    The number of frames transmitted on this