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Figure 4 : Model of an AAL5 Entity in a Switch
Ahmed & Tesink [Page 11]
RFC 1695 ATM Management Objects August 1994
__________________
| |
| AAL5 |
|________________|
| |
| Prop. Virtual |
| Interface |
|________________|
Figure 5 : AAL5 Entity's Interface Stack in a Switch
8.2. Managing AAL5 in a Host
Managing AAL5 in a host involves managing the AAL5 sublayer interface
as shown in Figures 6 and 7. The AAL5 sublayer is stacked directly
over the ATM sublayer. The ifTable is applied to the AAL5 sublayer
as defined in Section 8.3.
___________________________
| |
| ============= |
| | AAL5 | |
| | Entity | |
| ============= |
| | ATM | |
| | Entity | |
| ============= |
|___________|_____________|
|
__|__ ATM UNI
|
|
v
Figure 6 : Model of an AAL5 Entity in a Host
__________________
| |
| AAL5 |
|________________|
| |
| ATM Layer |
|________________|
| |
| Physical Layer|
|________________|
Ahmed & Tesink [Page 12]
RFC 1695 ATM Management Objects August 1994
Figure 7 : AAL5 Entity's Interface Stack in a Host
8.3. Support of AAL5 by ifTable
The AAL5 entity in an ATM device (e.g., switch or host) is managed
using the ifTable. There are additional counters specified for AAL5
than those specified in the ATM B-ICI document [10]. Specific
interpretations of ifTable for the AAL5 CPCS layer are as follows.
Object Use for AAL5 CPCS layer entity
====== ==============================
ifIndex Each AAL5 entity is represented by an ifEntry.
ifDescr Description of the AAL5 entity.
ifType The value that is allocated for AAL5 is 49.
ifMtu Set to the largest PDU size for the
AAL5 CPCS layer that can be processed
by the AAL5 entity.
ifSpeed Set to 0.
ifPhysAddress An octet string of zero length.
ifAdminStatus See [5].
ifOperStatus Assumes the value down(2) if the AAL5 or
any layer below that layer is down.
ifLastChange See [5].
ifInOctets The number of received AAL5 CPCS PDU octets.
ifOutOctets The number of AAL5 CPCS PDU octets
transmitted.
ifInUcastPkts The number of received AAL5 CPCS PDUs passed
to a higher-layer.
ifOutUcastPkts The number of AAL5 CPCS PDUs received from a
higher-layer for transmission.
[Note: The number of AAL5 PDUs actually
transmitted is the number received from a
higher-layer for transmission minus any which
are counted by ifOutErrors and ifOutDiscards.]
Ahmed & Tesink [Page 13]
RFC 1695 ATM Management Objects August 1994
ifInErrors Number of errored AAL5 CPCS PDUs received.
The types of errors counted include CRC-32 errors,
SAR time-out errors, and oversized SDU errors.
ifInUnknownProtos Set to 0.
ifInDiscards Number of received AAL5 CPCS PDUs discarded.
Possible reason may be input buffer overflow.
ifOutErrors Number of AAL5 CPCS PDUs that could not
be transmitted due to errors.
ifOutDiscards Number of AAL5 CPCS PDUs received for
transmission that are discarded.
Possible reason may be output buffer
overflow.
ifInMulticastPkts Set to 0.
ifInBroadcastPkts Set to 0.
ifOutMulticastPkts Set to 0.
ifOutBroadcastPkts Set to 0.
ifName Textual name (unique on this system) of the
AAL5 entity or an octet string of zero length.
ifHighSpeed Set to 0.
ifConnectorPresent Set to false (2).
ifPromiscuousMode Set to false(2).
ifLinkUpDownTrapEnable Default is disabled (2).
8.4. Support of Proprietary Virtual Interface by ifTable
Specific interpretations of ifTable for the proprietary virtual,
internal interface associated with an AAL5 entity in an ATM switch
are as follows.
Object Use for proprietary virtual, internal interface
associated with AAL entities
====== ===============================================
ifIndex Each proprietary virtual, internal interface
associated with AAL entities is represented by an
Ahmed & Tesink [Page 14]
RFC 1695 ATM Management Objects August 1994
ifEntry.
ifDescr Description of the proprietary virtual, internal
interface associated with AAL entities.
ifType The value that is allocated for proprietary
virtual, internal interface is 53.
ifSpeed See [5]. Set to 0 if the speed is not
known.
ifPhysAddress See [5]. An octet string of zero length
if no address is used for this interface.
ifAdminStatus See [5].
ifOperStatus See [5].
ifLastChange See [5].
ifName Textual name (unique on this system) of the
interface or an octet string of zero length.
ifHighSpeed See [5]. Set to 0 if the speed is not known.
ifConnectorPresent Set to false (2).
ifLinkUpDownTrapEnable Default is disabled (2).
8.5. AAL5 Connection Performance Statistics Group
An AAL5 connection table is used to provide AAL5 performance
information for each AAL5 virtual connection that is terminated at
the AAL5 entity contained within an ATM switch or host.
9. ILMI MIB and the ATM Managed Objects
The ILMI MIB is specified by the ATM Forum in UNI specification [9],
to manage local ATM UNIs. The support of the ATM management
functions by the ILMI MIB and those contained in this memo are
compared in Table 1. In this table, "yes" in the "ILMI MIB" column
indicates that the management functions are supported by the ILMI
MIB. The MIB groups in the "This memo" column are the groups listed
in Section 5.2.
For that subset of management information which the ILMI MIB and this
memo have in common, every effort has been made to retain identical
semantics and syntax, even though the MIB objects are identified
Ahmed & Tesink [Page 15]
RFC 1695 ATM Management Objects August 1994
using different OBJECT IDENTIFIERs.
Table 1 - Structuring of ATM Managed Objects
______________________________________________________________
| |This |ILMI|
ATM Mgmt.Inf. |ATM Managed Objects |memo |MIB |
______________|_________________________________|_______|____|
Local Interface Information:
_____________________________________________________________
ATM interface:| (1) port identifier |ATM MIB| |
physical layer| (2) physical transmission types | gr.1*|yes*|
configuration | (3) operational status |MIB II | |
| (4) administrative status | | |
| (5) last change status | | |
_____________________________________________________________
ATM interface:| (1) active VPI/VCI fields |ATM MIB| |
cell layer | (2) maximum number of VPCs/VCCs | gr.1 |yes |
configuration | (3) configured VPCs/VCCs | | ** |
| (4) ILMI VPI/VCI values | | |
| (5) ATM address type | | |
| (6) ATM administrative address | | |
_____________________________________________________________
ATM interface:|(1) received/transmitted cells | | |
cell layer |(2) cells with HEC error |MIB II |yes |
performance |(3) cell header validation errors| | |
_____________________________________________________________
ATM interface:|(1)DS3 PLCP severely errored |ATM MIB| |
PLCP & TC | framing seconds | gr.2,3| |
layer |(2)DS3 PLCP unavailable seconds | |no |
performance |(3)DS3 PLCP alarm state | | |
|(4)out of cell delineation events| | |
|(5)TC alarm state | | |
_____________________________________________________________
VP/VC link: |(1)VPI or VPI/VCI value |ATM MIB| |
configuration |(2)VCL or VPL operational status | gr. 4|yes |
|(3)VCL/VPL administrative status | |*** |
|(4)VCL/VPL last change status | | |
|(5)transmit/receive traffic/QoS | | |
| parameters | | |
|(6)AAL type | | |
|(7)transmit/receive AAL5 SDU size| | |
|(8)AAL5 encapsulation type | | |
_____________________________________________________________
Ahmed & Tesink [Page 16]
RFC 1695 ATM Management Objects August 1994
_____________________________________________________________
VP/VC |(1)cross-connect identifier | | |
Cross-connect:|(2)port identifier of one | | |
configuration | end | | |
|(3)port identifier of the other |ATM MIB| |
| end | gr. 5|no |
|(4)VPI or VPI/VCI value | | |
| of one end | | |
|(5)VPI or VPI/VCI value of | | |
| the other end | | |
|(6)VC/VP cross-connect | | |
| operational status | | |
|(7)VC/VP cross-connect | | |
| administrative status | | |
|(8)VC/VP last change status | | |
_____________________________________________________________
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