rfc2127.txt
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TXT
1,729 行
HigherLayer LowerLayer
0 3
0 4
0 5
0 8
0 9
1 0
2 1
3 2
4 2
5 2
6 1
7 1
8 6
9 7
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
Roeck Standards Track [Page 7]
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.
Roeck Standards Track [Page 8]
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.
Roeck Standards Track [Page 9]
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.
Roeck Standards Track [Page 10]
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.
Roeck Standards Track [Page 11]
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.
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