RFC2515 - Definitions of Managed Objects for ATM Management

Network Working Group K. Tesink, Editor
Request for Comments: 2515 Bell Communications Research
Obsoletes: 1695 February 1999
Category: Standards Track
Definitions of Managed Objects
for ATM Management
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Table of Contents
1 Abstract ............................................. 2
2 The SNMP Network Management Framework ................. 2
3 ATM Terminology ....................................... 3
3.1 VCL/VPL and VCC/VPC ................................. 3
3.2 PVC, SVC and Soft PVC ............................... 5
3.3 Traffic Management Parameters ....................... 6
3.3.1 Traffic Policing and Traffic Shaping Parameters
.................................................... 6
3.3.2 Cell Loss Priority ................................ 6
3.3.3 QoS Class ......................................... 6
3.3.4 Service Category .................................. 7
3.4 Max Active and Max Current VPI and VCI Bits ......... 7
4 Overview .............................................. 8
4.1 Background .......................................... 8
4.2 StrUCture of the MIB ................................ 9
4.3 ATM Interface Configuration Table ................... 9
4.4 ATM Interface DS3 PLCP and TC Layer Tables .......... 9
4.5 ATM Virtual Link and Cross-Connect Tables ........... 9
5 Application of MIB II to ATM .......................... 10
5.1 The System Group .................................... 10
5.2 The Interface Group ................................. 10
5.2.1 Support of the ATM Cell Layer by ifTable .......... 10
6 Support of the AAL3/4 Based Interfaces ................ 12
7 Support of the AAL5 Managed Objects ................... 12
7.1 Managing AAL5 in a Switch ........................... 12
7.2 Managing AAL5 in a Host ............................. 14
7.3 Support of AAL5 by ifTable .......................... 15
7.4 Support of Proprietary Virtual Interface by ifT-
able ............................................... 16
7.5 AAL5 Connection Performance Statistics Table ........ 17
8 ILMI MIBs and the ATM Managed Objects ................. 18
9 Definitions ........................................... 20
10 Acknowledgments ...................................... 83
11 References ........................................... 83
12 Security Considerations .............................. 85
13 Author"s Address ..................................... 85
14 Intellectual Property ................................ 86
15 Full Copyright Statement ............................. 87
1. Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes objects used for managing ATM-based
interfaces, devices, networks and services.
This memo replaces RFC1695 [24]. Changes relative to RFC1695 are
summarized in the MIB module"s REVISION clause.
Textual Conventions used in this MIB are defined in [6] and [19].
2. The SNMP Network Management Framework
The SNMP Management Framework presently consists of five major
components:
0 An overall architecture, described in RFC2271 [1].
0 Mechanisms for describing and naming objects and events
for the purpose of management. The first version of this
Structure of Management Information (SMI) is called SMIv1 and
described in STD 16, RFC1155 [2], STD 16, RFC1212 [3] and RFC
1215 [4]. The second version, called SMIv2, is described in RFC
1902 [5], RFC1903 [6] and RFC1904 [7].
0 Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC1157 [8]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC1901 [9] and
RFC1906 [10].
The third version of the message protocol is called SNMPv3 and
described in RFC1906 [10], RFC2272 [11] and RFC2274 [12].
0 Protocol operations for Accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC1157 [8]. A second set of protocol
operations and associated PDU formats is described in RFC1905
[13].
0 A set of fundamental applications described in RFC2273 [14] and
the view-based access control mechanism described in RFC2275
[15].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A
MIB conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because no
translation is possible (e.g., use of Counter64). Some machine
readable information in SMIv2 will be converted into textual
descriptions in SMIv1 during the translation process. However, this
loss of machine readable information is not considered to change the
semantics of the MIB.
3. ATM Terminology
Some basic ATM terminologies are described in this section to
facilitate defining the ATM managed objects.
3.1. VCL/VPL and VCC/VPC
There are two distinct types of ATM virtual connections: Virtual
Channel Connections (VCCs) and Virtual Path Connection (VPCs). As
shown in Figures 1 and 2, ATM virtual connections consist of
concatenated series of virtual links which forms a path between two
end points, with each concatenation occurring at an ATM switch.
Virtual links of VCCs are called Virtual Channel Links (VCLs).
Virtual links of VPCs are called Virtual Path Links (VPLs). The VCI
and VPI fields in the ATM cell header associate each cell of a VCC
with a particular VCL over a given physical link. The VPI field in
the ATM cell header associates each cell of a VPC with a particular
VPL over a given physical link. Switches route cells between VCLs
(or VPLs) via a cross-connect function according to the cells"
VCI/VPI (or VPI) values.
<-----------------------VCC-------------------------->
------------ -----------
ATM ATM
X-Connect X-Connect
VCL1 Point VCL2 Point VCL3
O-------------X---------------------X------------O

------------ ------------
ATM Switch ATM Switch
Figure 1: Virtual Channel Links and
Virtual Channel Connection
<-----------------------VPC-------------------------->
------------ -----------
ATM ATM
X-Connect X-Connect
VPL1 Point VPL2 Point VPL3
O-------------X---------------------X------------O

------------ ------------
ATM Switch ATM Switch
Figure 2: Virtual Path Links and
Virtual Path Connection
A single ATM end-system or switch does not support the whole end-to-
end span of a VCC (or VPC). Rather, multiple ATM end-systems and/or
switches each support one piece of the VCC (or VPC). That is, each
ATM end-system (or ATM switch) at one end of the VCC/VPC supports its
end of the VCC/VPC plus the VCL or VPL on its external interface, and
each switch through which the VCC/VPC passes supports the pair of
VCLs/VPLs on its external interfaces as well as the cross-connection
of those VCLs/VPLs. Thus, the end-to-end management of a VCC or VPC
is achieved only by appropriate management of its individual pieces
in combination.
Note that for management purposes, an ATM network may be viewed as a
large distributed switch by hiding all the network"s internal
connectivity as being internal to the distributed switch (as shown in
Figure 2a). This model may for example be used for Customer Network
Management (CNM) purposes.
<---------------------VCC--------------------------->
--------------------------------------

---------- ----------
ATM ATM
VCL1 Switch Switch VCL3
O----------------------/----------------------O

---------- ----------

ATM Network
--------------------------------------
Figure 2a: ATM Network modeled as a large distributed
switch
A VCC has a set of traffic characteristics (i.e., bandwidth
parameters, service category parameters, etc.). VCLs inherit their
traffic characteristics from the VCC of which they are a part. VCCs
are bi-directional by definition. However, the traffic parameters in
the two directions of a connection can be symmetric or asymmetric,
i.e., the two directions can have the same or different traffic
flows. A uni-directional traffic flow across a VCC is achieved by
assigning a zero bandwidth in one direction. Note that in addition
to the bandwidth required by the user traffic flow, bandwidth is also
required for OAM cell flows, even for the zero-bandwidth direction of
a uni-directional connection. These same principles apply to VPCs.
3.2. PVC, SVC and Soft PVC
A Permanent Virtual Connection (PVC) is a provisioned VCC or VPC. A
Switched Virtual Connection (SVC) is a switched VCC or VPC that is
set up in real-time via call set-up signaling procedures. A PVC (or
an SVC) can be a point-to-point, point-to-multipoint, or multipoint-
to-multipoint VCC or VPC. A Soft PVC is a connection of which
portions are switched, while other portions are permanent (see Figure
3 and [22]).
+--------+ +--------+ +--------+
pvc ATM svc svc ATM svc svc ATM pvc
---- Switch ----------- Switch ----------- Switch ----
+--------+ +--------+ +--------+
Figure 3: An example of a Soft PVC
3.3. Traffic Management Parameters
3.3.1. Traffic Policing and Traffic Shaping Parameters
In order to allocate resources fairly among different users, some
networks police traffic at resource access points. The traffic
enforcement or policing taken at a UNI is called Usage Parameter
Control (UPC) and is conceptually activated on an incoming VCL or VPL
as shown in Figure 4. The use of the traffic enforcer at the ingress
of the connection is to make sure that the user traffic does not
exceed the negotiated traffic parameters such as the peak cell rate
associated with a specific traffic descriptor type.
---------- ----------
UNI ATM NNI ATM UNI
switch switch
O<------->X(UPC) <----------> (UPC)X<-------->O
VCL VCL VCL
---------- ----------
Figure 4: An Example of a UPC
In addition, traffic shaping may be performed on an outgoing VPL or
VCL at a given ATM interface. The function of the ATM traffic
shaper, conceptually either at the source or an egress point of the
connection, is to smooth the outgoing cell traffic inter-arrival
time. If policing or shaping is not performed then the policing or
shaping algorithm is not activated.
3.3.2. Cell Loss Priority
To prioritize traffic during resource congestion, ATM cells are
assigned one of the two types of Cell Loss Priority (CLP), CLP=0 and
CLP=1. ATM cells with CLP=0 have a higher priority in regard to cell
loss than ATM cells with CLP=1. Therefore, during resource
congestions, CLP=1 cells are dropped before any CLP=0 cell is
dropped.
3.3.3. QoS Class
RFC1695 specified that one of a number of Quality of Service (QoS)
classes is assigned to a VCC or VPC by associating the object
atmTrafficQoSClass with each VCL or VPL. However, new insights in
ATM traffic management have caused this object to be deprecated.
3.3.4. Service Category
Replacing QoS Class, VPLs and VCLs are qualified in terms of their
service category (atmServiceCategory). When properly configured, VCLs
(or VPLs) concatenated to form a VCC (or VPC) will all have the same
service category class as that of the VCC (or VPC).
3.4. Max Active and Max Current VPI and VCI Bits
A manager may wish to configure the maximum number of VPI and VCI
bits that can be used to identify VPIs and VCIs on a given ATM
interface. This value can be less than or equal to the maximum
number of bits supported by the interface hardware, and is referred
to in the MIB as the Max Active VPI Bits and Max Active VCI Bits.
However, a manager may not be able to configure the Max Active Bits
on both ends of an ATM link. For example, the manager may not be
allowed write access to the peer"s MIB, or there may be hardware
limitations on the peer device. Therefore, the two ATM devices may
use ILMI to negotiate "Max Current" VPI and VCI bits, which is the
maximum number of bits that both interfaces are willing to support.
This is illustrated in Figure 5. The relationship between the
different parameters is illustrated in Figure 6. Note that if ILMI
negotiation is not supported, then the devices have no choice but to
use the configured Max Active bits, and assume that it has been
configured to the same value on both ends of the link.
+--------+ +--------+ +--------+
ATM IF a IF b ATM IF c IF d ATM
Device -------------- Device -------------- Device
+--------+ +--------+ +--------+
IF a: Max Active VPI Bits = 6 (configured)
Max Current VPI Bits = 6 (negotiated)
IF b: Max Active VPI Bits = 8 (configured)
Max Current VPI Bits = 6 (negotiated)
IF c: Max Active VPI Bits = 8 (configured)
Max Current VPI Bits = 8 (negotiated)
IF d: Max Active VPI Bits = 8 (configured)
Max Current VPI Bits = 8 (negotiated)
(between IF a and IF b, the minimum of the two configured
"Max Active VPI Bits" is 6, so both interfaces set their
"Max Current VPI Bits" to 6. Since IF c and IF d both
are configured with "Max Active VPI Bits" of 8, they
set their "Max Current VPI Bits" to 8.)
Figure 5
MSB LSB
+----------------------------------------------------+

+----------------------------------------------------+
^ ^ ^ ^

Max bits Max Bits Max Max
supported supported Active (config.) current (negotiated)
by MIB by h/w Bits Bits
Figure 6
4. Overview
ATM management objects are used to manage ATM interfaces, ATM virtual
links, ATM cross-connects, AAL5 entities and AAL5 connections
supported by ATM hosts, ATM switches and ATM networks. This section
provides an overview and background of how to use this MIB and other
potential MIBs for this purpose.
The purpose of this memo is primarily to manage ATM PVCs. ATM SVCs
are also represented by the management information in this MIB.
However, full management of SVCs may require additional capabilities
which are beyond the scope of this memo.
4.1. Background
In addition to the MIB module defined in this memo, other MIB modules
are necessary to manage ATM interfaces, links and cross-connects.
Examples include MIB II for general system and interface management
[16][17], the DS3 or SONET MIBs for management of physical
interfaces, and, as appropriate, MIB modules for applications that
make use of ATM, such as SMDS. These MIB modules are outside the
scope of this specification.
The current specification of this ATM MIB is based on SNMPv2-SMI.
4.2. Structure of the MIB
The managed ATM objects are arranged into the following tables:
(1) ATM interface configuration table
(2) ATM interface DS3 PLCP and TC sublayer tables
(3) ATM traffic parameter table
(4) ATM interface virtual link (VPL/VCL) configuration
tables
(5) ATM VP/VC cross-connect tables
(6) AAL5 connection performance statistics table
Note that, managed objects for activation/deactivation of OAM cell
flows and ATM traps notifying virtual connection or virtual link
failures are outside the scope of this memo.
4.3. ATM Interface Configuration Table
This table contains information on ATM cell layer configuration of
local ATM interfaces on an ATM device in addition to the information
on such interfaces contained in the ifTable.
4.4. ATM Interface DS3 PLCP and TC Layer Tables
These tables provide performance statistics of the DS3 PLCP and TC
sublayer of local ATM interfaces on a managed ATM device. DS3 PLCP
and TC sublayer are currently used to carry ATM cells respectively
over DS3 and SONET transmission paths.
4.5. ATM Virtual Link and Cross-Connect Tables
ATM virtual link and cross-connect tables model bi-directional ATM
virtual links and ATM cross-connects. The ATM VP/VC link tables are
implemented in an ATM host, ATM switch and ATM network. The ATM
switch and ATM network also implement the ATM VP/VC cross-connect
tables. Both link and cross-connect tables are implemented in a
carrier"s network for Customer Network Management (CNM) purposes.
The ATM virtual link tables are used to create, delete or modify ATM
virtual links in an ATM host, ATM switch and ATM network. ATM
virtual link tables along with the cross-connect tables are used to
create, delete or modify ATM cross-connects in an ATM switch or ATM
network (e.g., for CNM purposes).
For a PVC, the cross-connect between two VPLs is represented in the
atmVpCrossConnectTable of the ATM-MIB, indexed by the
atmVplCrossConnectIdentifier values for the two VPLs, and the cross-
rconnect between two VCLs is represented in the
atmVcCrossConnectTable of the ATM-MIB, indexed by the
atmVclCrossConnectIdentifier values for the two VCLs.
For an SVC or Soft PVC the VPL and VCL tables defined in this memo
are used. Hoewever, for an SVC or Soft PVC the cross-connect between
two VPLs is represented in the atmSvcVpCrossConnectTable of the
ATM2-MIB, indexed by the atmVplCrossConnectIdentifier values for the
two VPLs, and the cross-connect between two VCLs is represented in
the atmSvcVcCrossConnectTable of the ATM2-MIB, indexed by the
atmVclCrossConnectIdentifier values for the two VCLs.
Note: The ATM2-MIB module was being defined in a separate memo at the
time of this publication. Please consult the RFCDirectory for an
exact reference.
5. Application of MIB II to ATM
5.1. The System Group
For the purposes of the sysServices object in the System Group of MIB
II [16], ATM is a data link layer protocol. Thus, for ATM switches
and ATM networks, sysServices will have the value "2".
5.2. The Interface Group
The Interfaces Group of MIB II defines generic managed objects for
managing interfaces. This memo contains the media-specific
extensions to the Interfaces Group for managing ATM interfaces.
This memo assumes the interpretation of the Interfaces Group to be in
accordance with [17] which states that the interfaces table (ifTable)
contains information on the managed resource"s interfaces and that
each sub-layer below the internetwork layer of a network interface is
considered an interface. Thus, the ATM cell layer interface is
represented as an entry in the ifTable. This entry is concerned with
the ATM cell layer as a whole, and not with individual virtual
connections which are managed via the ATM-specific managed objects
specified in this memo. The inter-relation of entries in the ifTable
is defined by Interfaces Stack Group defined in [17].
5.2.1. Support of the ATM Cell Layer by ifTable
Some specific interpretations of ifTable for the ATM cell layer
follow.
Object Use for the generic ATM layer
====== =============================
ifIndex Each ATM port is represented by an ifEntry.
ifDescr Description of the ATM interface.
ifType The value that is allocated for ATM is 37.
ifSpeed The total bandwidth in bits per second
for use by the ATM layer.
ifPhysAddress The interface"s address at the ATM protocol
sublayer; the ATM address which would be used as the value
of the Called Party Address Information Element (IE) of a
signalling message for a connection which either:
- would terminate at this interface, or
- for which the Called Party Address IE
would need to be replaced by the Called Party SubAddress
IE before the message was forwarded to any other
interface.
For an interface on which signalling is not supported,
then the interface does not necessarily have an address,
but if it does, then ifPhysAddress is the address which
would be used as above in the event that signalling were
supported. If the interface has multiple such addresses,
then ifPhysAddress is its primary address. If the
interface has no addresses, then ifPhysAddress is an octet
string of zero length. Address encoding is as per [20].
Note that addresses assigned for purposes other than those
listed above (e.g., an address associated with the service
provider side of a public network UNI) may be represented
through atmInterfaceSubscrAddress.
ifAdminStatus See [17].
ifOperStatus Assumes the value down(2) if the ATM cell
layer is down.
ifLastChange See [17].
ifInOctets The number of received octets over the
interface, i.e., the number of received, assigned cells
multiplied by 53.
ifOutOctets The number of transmitted octets over the interface,
i.e., the number of transmitted, assigned cells multiplied
by 53.
ifInErrors The number of cells dropped due to uncorrectable HEC
errors.
ifInUnknownProtos The number of received cells discarded during cell
header validation, including cells with unrecognized
VPI/VCI values, and cells with invalid cell header
patterns. If cells with undefined PTI values are
discarded, they are also counted here.
ifOutErrors See [17].
ifName Textual name (unique on this system) of the
interface or an octet string of zero length.
ifLinkUpDownTrapEnable Default is disabled (2).
ifConnectorPresent Set to false (2).
ifHighSpeed See [17].
ifHCInOctets The 64-bit version of ifInOctets; supported
if required by the compliance statements in [17].
ifHCOutOctets The 64-bit version of ifOutOctets; supported
if required by the compliance statements in [17].
ifAlias The non-volatile "alias" name for the interface
as specified by a network manager.
6. Support of the AAL3/4 Based Interfaces
For the management of AAL3/4 CPCS layer, see [18].
7. Support of the AAL5 Managed Objects
Support of AAL5 managed objects in an ATM switch and ATM host are
described below.
7.1. Managing AAL5 in a Switch
Managing AAL5 in a switch involves:
(1) performance management of an AAL5 entity as
an internal resource in a switch
(2) performance management of AAL5 per virtual connection
AAL5 in a switch is modeled as shown in Figure 7 and 8. AAL5 will be
managed in a switch for only those virtual connections that carry
AAL5 and are terminated at the AAL5 entity in the switch. Note that,
the virtual channels within the ATM UNIs carrying AAL5 will be
switched by the ATM switching fabric (termed as ATM Entity in the
figure) to the virtual channels on a proprietary internal interface
associated with the AAL5 process (termed as AAL5 Entity in the
figure). Therefore, performance management of the AAL5 resource in
the switch will be modeled using the ifTable through an internal
(pseudo-ATM) virtual interface and the AAL5 performance management
per virtual connection will be supported using an additional AAL5
connection table in the ATM MIB. The association between the AAL5
virtual link at the proprietary virtual, internal interface and the
ATM virtual link at the ATM interface will be derived from the
virtual channel cross-connect table and the virtual channel link
table in the ATM MIB. Note that for the proprietary virtual interface
the traffic transmit and receive conventions in the virtual channel
link table are as follows:
Transmitting traffic: ATM Entity ---> AAL5 Entity
Receiving traffic: ATM Entity <--- AAL5 Entity
___________________________

=============
AAL5
Entity
=============

-----Prop. Virtual Interface

=============
ATM
Entity
=============
____________________

---------------- ATM UNIs


v v v v v
Figure 7: Model of an AAL5 Entity in a Switch
__________________

AAL5
________________

Prop. Virtual
Interface
________________
Figure 8: AAL5 Entity"s Interface Stack in a Switch
7.2. Managing AAL5 in a Host
Managing AAL5 in a host involves managing the AAL5 sublayer interface
as shown in Figure 9 and 10. The AAL5 sublayer is stacked directly
over the ATM sublayer. The ifTable is applied to the AAL5 sublayer
as defined in Section 10.3.
___________________________

=============
AAL5
Entity
=============
ATM
Entity
=============
________________________

____ ATM UNI


v
Figure 9: Model of an AAL5 Entity in a Host
__________________

AAL5
________________

ATM Layer
________________

Physical Layer
________________
Figure 10: AAL5 Entity"s Interface Stack in a Host
7.3. 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 [21]. 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 [17].
ifOperStatus Assumes the value down(2) if the AAL5
layer is down.
ifLastChange See [17].
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.]
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).
ifAlias The non-volatile "alias" name for the interface
as specified by a network manager.
7.4. 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
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 [17]. Set to 0 if the speed is not
known.
ifPhysAddress See [17]. An octet string of zero length
if no address is used for this interface.
ifAdminStatus See [17].
ifOperStatus See [17].
ifLastChange See [17].
ifName Textual name (unique on this system) of the
interface or an octet string of zero length.
ifHighSpeed See [17]. Set to 0 if the speed is not known.
ifConnectorPresent Set to false (2).
ifLinkUpDownTrapEnable Default is disabled (2).
ifAlias The non-volatile "alias" name for the interface
as specified by a network manager.
7.5. AAL5 Connection Performance Statistics Table
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.
8. ILMI MIBs and the ATM Managed Objects
The ILMI MIBs are specified by the ATM Forum as a set of several
MIBs, all currently defined in the ILMI Specification [23]. The ILMI
protocols and MIBs allow two connected ATM Interface Management
Entities (IMEs) to exchange bi-directional parameters, mainly to
facilitate auto-configuration between ATM peer entities. The support
of the ATM management functions by the ILMI MIBs and those contained
in this memo are compared in Table 1. In this table, "yes" in the
"ILMI MIBs" column indicates that the management functions are
supported by the ILMI MIBs. The parenthesized numbers in the "This
memo" column correspond to the sets of tables enumerated in Section
6.2.
For that subset of management information which the ILMI MIBs and
this memo have in common, every effort has been made to retain
identical semantics and syntax, even though the MIB objects are
identified using different OBJECT IDENTIFIERs.
Table 1 - Structuring of ATM Managed Objects
______________________________________________________________
This ILMI
ATM Mgmt.Inf. ATM Managed Objects memo MIBs
__________________________________________________________
Local Interface Information:
_____________________________________________________________
ATM interface: (1) port identifier ATM MIB
physical layer (2) physical transmission types (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 (1) yes
configuration (3) configured VPCs/VCCs **
(4) ILMI VPI/VCI values
(5) Neighbor system info
(6) Max. number of VPI/VCI bits yes
(7) ATM Subscribed 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 (2)
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 (3,4)yes
(3)VCL/VPL administrative status ***
(4)VCL/VPL last change status
(5)transmit/receive traffic/
service category parameters
(6)AAL type
(7)transmit/receive AAL5 SDU size
(8)AAL5 encapsulation type
(9)connection topology type
(10)use of call control
_____________________________________________________________
VP/VC (1)cross-connect identifier
Cross-connect:(2)port identifier of one
configuration end
(3)port identifier of the other ATM MIB
end (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
_____________________________________________________________
VCC AAL5 CPCS (1)PDUs discarded for CRC errors ATM MIB
layer: (2)PDUs discarded due to (6)
performance reassembly time out no
(3)PDUs discarded due to large
SDUs
_____________________________________________________________
AAL5 entity: (1)received/transmitted PDUs
(2)PDUs discarded due to
protocol errors MIB II no
(3)a set of configuration/state
parameters
_____________________________________________________________
*The operational, administrative, and last change status of the ATM
interface and the physical transmission type shall be supported by
the interface table in MIB II [16][17]. ILMI does not contain the
administrative and last change status of the ATM interface.
** The ILMI MIB contains read-only objects for various parameters at
the ATM interface level.
***The ILMI MIBs contain local and end-to-end operational status of
the VPC/VCC segment. However, it does not contain the VPC/VCC
administrative and last change status and the VCC AAL information.
9. Definitions
ATM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
Counter32, Integer32, IpAddress, mib-2
FROM SNMPv2-SMI
DisplayString, RowStatus, TruthValue
FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
InterfaceIndex, ifIndex
FROM IF-MIB
AtmAddr, AtmConnKind, AtmConnCastType,
AtmServiceCategory, AtmTrafficDescrParamIndex,
AtmVpIdentifier, AtmVcIdentifier,
AtmVorXAdminStatus, AtmVorXLastChange,
AtmVorXOperStatus, atmNoClpNoScr
FROM ATM-TC-MIB;
atmMIB MODULE-IDENTITY
LAST-UPDATED "9810191200Z"
ORGANIZATION "IETF AToM MIB Working Group"
CONTACT-INFO
" Kaj Tesink
Postal: Bellcore
331 Newman Springs Road
Red Bank, NJ 07701
Tel: 732-758-5254
Fax: 732-758-2269
E-mail: kaj@bellcore.com"
DESCRIPTION
"This is the MIB Module for ATM and AAL5-related
objects for managing ATM interfaces, ATM virtual
links, ATM cross-connects, AAL5 entities, and
and AAL5 connections."
REVISION "9810191200Z"
DESCRIPTION
"The initial revision of this module was published
as RFC1695. Key revisions include:
o Textual Conventions and OBJECT IDENTITIES have
been moved to a separate MIB module.
o Applicability of objects to PVCs, SVCs and Soft
PVCs has been clarified.
o DEFVAL clauses have been added.
o The relationship of ifIndex values with different
layers and sublayers related to ATM has been
clarified.
o atmTrafficQosClass has been deprecated
and replaced with atmServiceCategory.
o atmInterfaceCurrentMaxVpiBits and
atmInterfaceCurrentMaxVciBits have been added with
a description on their relationship with other
objects.
o atmInterfaceAddressType and atmInterfaceAdminAddress
have been deprecated and replaced by
atmInterfaceSubscrAddress.
o atmInterfaceTCAlarmState has been clarified.
o atmTrafficDescrParamIndexNext has been introduced
in order to provide a manager a free
atmTrafficDescrParamIndex value.
o The atmTrafficFrameDiscard capability has been added.
o A connection topology type (atmVpl/VclCastType) and
a call control type (atmVpl/VclConnKind) have been
added.
o aal2 has been added to atmVccAalType."
REVISION "9406072245Z"
DESCRIPTION
"The RFC1695 version of this MIB module."
::= { mib-2 37 }
atmMIBObjects OBJECT IDENTIFIER ::= {atmMIB 1}
-- {atmMIBObjects 1} has been moved to a separate
-- specification [19].
-- This ATM MIB Module consists of the following tables:
-- (1) ATM Interface configuration table
-- (2) ATM Interface DS3 PLCP table
-- (3) ATM Interface TC Sublayer table
-- (4) Atm Traffic Descriptor table
-- (5) ATM Interface VPL configuration table
-- (6) ATM Interface VCL configuration table
-- (7) ATM VP Cross Connect table (for PVCs)
-- (8) ATM VC Cross Connect table (for PVCs)
-- (9) ATM Interface AAL5 VCC performance statistics
-- table
-- ATM Interface Configuration Parameters Table
-- This table contains ATM specific
-- configuration information associated with
-- an ATM interface beyond those
-- supported using the ifTable.
atmInterfaceConfTable OBJECT-TYPE
SYNTAX SEQUENCE OF AtmInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains ATM local interface
configuration parameters, one entry per ATM
interface port."
::= { atmMIBObjects 2 }
atmInterfaceConfEntry OBJECT-TYPE
SYNTAX AtmInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This list contains ATM interface configuration
parameters and state variables and is indexed
by ifIndex values of ATM interfaces."
INDEX { ifIndex }
::= { atmInterfaceConfTable 1}
AtmInterfaceConfEntry ::= SEQUENCE {
atmInterfaceMaxVpcs INTEGER,
atmInterfaceMaxVccs INTEGER,
atmInterfaceConfVpcs INTEGER,
atmInterfaceConfVccs INTEGER,
atmInterfaceMaxActiveVpiBits INTEGER,
atmInterfaceMaxActiveVciBits INTEGER,
atmInterfaceIlmiVpi AtmVpIdentifier,
atmInterfaceIlmiVci AtmVcIdentifier,
atmInterfaceAddressType INTEGER,
atmInterfaceAdminAddress AtmAddr,
atmInterfaceMyNeighborIpAddress IpAddress,
atmInterfaceMyNeighborIfName DisplayString,
atmInterfaceCurrentMaxVpiBits INTEGER,
atmInterfaceCurrentMaxVciBits INTEGER,
atmInterfaceSubscrAddress AtmAddr
}
atmInterfaceMaxVpcs OBJECT-TYPE
SYNTAX INTEGER (0..4096)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The maximum number of VPCs (PVPCs and SVPCs)
supported at this ATM interface. At the ATM UNI,
the maximum number of VPCs (PVPCs and SVPCs)
ranges from 0 to 256 only."
::= { atmInterfaceConfEntry 1}
atmInterfaceMaxVccs OBJECT-TYPE
SYNTAX INTEGER (0..65536)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The maximum number of VCCs (PVCCs and SVCCs)
supported at this ATM interface."
::= { atmInterfaceConfEntry 2}
atmInterfaceConfVpcs OBJECT-TYPE
SYNTAX INTEGER (0..4096)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of VPCs (PVPC, Soft PVPC and SVPC)
currently in use at this ATM interface. It includes
the number of PVPCs and Soft PVPCs that are configured
at the interface, plus the number of SVPCs
that are currently established at the
interface.
At the ATM UNI, the configured number of
VPCs (PVPCs and SVPCs) can range from
0 to 256 only."
::= { atmInterfaceConfEntry 3}
atmInterfaceConfVccs OBJECT-TYPE
SYNTAX INTEGER (0..65536)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of VCCs (PVCC, Soft PVCC and SVCC)
currently in use at this ATM interface. It includes
the number of PVCCs and Soft PVCCs that are configured
at the interface, plus the number of SVCCs
that are currently established at the
interface."
::= { atmInterfaceConfEntry 4}
atmInterfaceMaxActiveVpiBits OBJECT-TYPE
SYNTAX INTEGER (0..12)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The maximum number of active VPI bits
configured for use at the ATM interface.
At the ATM UNI, the maximum number of active
VPI bits configured for use ranges from
0 to 8 only."
::= { atmInterfaceConfEntry 5}
atmInterfaceMaxActiveVciBits OBJECT-TYPE
SYNTAX INTEGER (0..16)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The maximum number of active VCI bits
configured for use at this ATM interface."
::= { atmInterfaceConfEntry 6}
atmInterfaceIlmiVpi OBJECT-TYPE
SYNTAX AtmVpIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The VPI value of the VCC supporting
the ILMI at this ATM interface. If the values of
atmInterfaceIlmiVpi and atmInterfaceIlmiVci are
both equal to zero then the ILMI is not
supported at this ATM interface."
DEFVAL { 0 }
::= { atmInterfaceConfEntry 7}
atmInterfaceIlmiVci OBJECT-TYPE
SYNTAX AtmVcIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The VCI value of the VCC supporting
the ILMI at this ATM interface. If the values of
atmInterfaceIlmiVpi and atmInterfaceIlmiVci are
both equal to zero then the ILMI is not
supported at this ATM interface."
DEFVAL { 16 }
::= { atmInterfaceConfEntry 8}
atmInterfaceAddressType OBJECT-TYPE
SYNTAX INTEGER {
private(1),
nsapE164(2),
nativeE164(3),
other(4)
}
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The type of primary ATM address configured
for use at this ATM interface."
::= { atmInterfaceConfEntry 9 }
-- The atmInterfaceAdminAddress object has been replaced by
-- atmInterfaceSubscrAddress.
atmInterfaceAdminAddress OBJECT-TYPE
SYNTAX AtmAddr
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The primary address assigned for administrative purposes,
for example, an address associated with the
service provider side of a public network UNI
(thus, the value of this address corresponds
with the value of ifPhysAddress at the host side).
If this interface has no assigned administrative
address, or when the address used for
administrative purposes is the same as that used
for ifPhysAddress, then this is an octet string of
zero length."
::= { atmInterfaceConfEntry 10 }
atmInterfaceMyNeighborIpAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The IP address of the neighbor system connected to
the far end of this interface, to which a Network
Management Station can send SNMP messages, as IP
datagrams sent to UDP port 161, in order to access
network management information concerning the
operation of that system. Note that the value
of this object may be oBTained in different ways,
e.g., by manual configuration, or through ILMI
interaction with the neighbor system."
::= { atmInterfaceConfEntry 11 }
atmInterfaceMyNeighborIfName OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The textual name of the interface on the neighbor
system on the far end of this interface, and to
which this interface connects. If the neighbor
system is manageable through SNMP and supports
the object ifName, the value of this object must
be identical with that of ifName for the ifEntry
of the lowest level physical interface
for this port. If this interface does not have a
textual name, the value of this object is a zero
length string. Note that the value of this object
may be obtained in different ways, e.g., by manual
configuration, or through ILMI interaction with
the neighbor system."
::= { atmInterfaceConfEntry 12 }
atmInterfaceCurrentMaxVpiBits OBJECT-TYPE
SYNTAX INTEGER (0..12)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum number of VPI Bits that may
currently be used at this ATM interface.
The value is the minimum of
atmInterfaceMaxActiveVpiBits, and the
atmInterfaceMaxActiveVpiBits of the interface"s
UNI/NNI peer.
If the interface does not negotiate with
its peer to determine the number of VPI Bits
that can be used on the interface, then the
value of this object must equal
atmInterfaceMaxActiveVpiBits."
::= { atmInterfaceConfEntry 13 }
atmInterfaceCurrentMaxVciBits OBJECT-TYPE
SYNTAX INTEGER (0..16)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum number of VCI Bits that may
currently be used at this ATM interface.
The value is the minimum of
atmInterfaceMaxActiveVciBits, and the
atmInterfaceMaxActiveVciBits of the interface"s
UNI/NNI peer.
If the interface does not negotiate with
its peer to determine the number of VCI Bits
that can be used on the interface, then the
value of this object must equal
atmInterfaceMaxActiveVciBits."
::= { atmInterfaceConfEntry 14 }
atmInterfaceSubscrAddress OBJECT-TYPE
SYNTAX AtmAddr
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The identifier assigned by a service provider
to the network side of a public network UNI.
If this interface has no assigned service provider
address, or for other interfaces this is an octet string
of zero length."
::= { atmInterfaceConfEntry 15 }
-- The ATM Interface DS3 PLCP Table
-- This table contains the DS3 PLCP configuration and
-- state parameters of those ATM interfaces
-- which use DS3 PLCP for carrying ATM cells over DS3.
atmInterfaceDs3PlcpTable OBJECT-TYPE
SYNTAX SEQUENCE OF AtmInterfaceDs3PlcpEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains ATM interface DS3 PLCP
parameters and state variables, one entry per
ATM interface port."
::= { atmMIBObjects 3}
atmInterfaceDs3PlcpEntry OBJECT-TYPE
SYNTAX AtmInterfaceDs3PlcpEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This list contains DS3 PLCP parameters and
state variables at the ATM interface and is
indexed by the ifIndex value of the ATM interface."
INDEX { ifIndex }
::= { atmInterfaceDs3PlcpTable 1}
AtmInterfaceDs3PlcpEntry ::= SEQUENCE {
atmInterfaceDs3PlcpSEFSs Counter32,
atmInterfaceDs3PlcpAlarmState INTEGER,
atmInterfaceDs3PlcpUASs Counter32
}
atmInterfaceDs3PlcpSEFSs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of DS3 PLCP Severely Errored Framing
Seconds (SEFS). Each SEFS represents a
one-second interval which contains
one or more SEF events."
::= { atmInterfaceDs3PlcpEntry 1}
atmInterfaceDs3PlcpAlarmState OBJECT-TYPE
SYNTAX INTEGER {
noAlarm(1),
receivedFarEndAlarm(2),
incomingLOF(3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if there is an
alarm present for the DS3 PLCP. The value
receivedFarEndAlarm means that the DS3 PLCP
has received an incoming Yellow
Signal, the value incomingLOF means that
the DS3 PLCP has declared a loss of frame (LOF)
failure condition, and the value noAlarm
means that there are no alarms present.
Transition from the failure to the no alarm state
occurs when no defects (e.g., LOF) are received
for more than 10 seconds."
::= { atmInterfaceDs3PlcpEntry 2}
atmInterfaceDs3PlcpUASs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds encountered by the PLCP."
::= { atmInterfaceDs3PlcpEntry 3}
-- The ATM Interface TC Sublayer Table
-- This table contains TC sublayer configuration and
-- state parameters of those ATM interfaces
-- which use TC sublayer for carrying ATM cells over
-- SONET/SDH or DS3.
atmInterfaceTCTable OBJECT-TYPE
SYNTAX SEQUENCE OF AtmInterfaceTCEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains ATM interface TC
Sublayer parameters and state variables,
one entry per ATM interface port."
::= { atmMIBObjects 4}
atmInterfaceTCEntry OBJECT-TYPE
SYNTAX AtmInterfaceTCEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This list contains TC Sublayer parameters
and state variables at the ATM interface and is
indexed by the ifIndex value of the ATM interface."
INDEX {ifIndex }
::= { atmInterfaceTCTable 1}
AtmInterfaceTCEntry ::= SEQUENCE {
atmInterfaceOCDEvents Counter32,
atmInterfaceTCAlarmState INTEGER
}
atmInterfaceOCDEvents OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times the Out of Cell
Delineation (OCD) events occur. If seven
consecutive ATM cells have Header Error
Control (HEC) violations, an OCD event occurs.
A high number of OCD events may indicate a
problem with the TC Sublayer."
::= { atmInterfaceTCEntry 1}
atmInterfaceTCAlarmState OBJECT-TYPE
SYNTAX INTEGER {
noAlarm(1),
lcdFailure(2)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if there is an
alarm present for the TC Sublayer. The value
lcdFailure(2) indicates that the TC Sublayer
is currently in the Loss of Cell Delineation
(LCD) defect maintenance state. The value
noAlarm(1) indicates that the TC Sublayer
is currently not in the LCD defect
maintenance state."
::= { atmInterfaceTCEntry 2}
-- ATM Traffic Descriptor Parameter Table
-- This table contains a set of self-consistent
-- ATM traffic parameters including the
-- ATM traffic service category.
-- The ATM virtual link tables (i.e., VPL and VCL tables)
-- will use this ATM Traffic Descriptor table
-- to assign traffic parameters and service category
-- to the receive and transmit directions of
-- the ATM virtual links (i.e., VPLs and VCLs).
-- The ATM VPL or VCL table will indicate a row
-- in the atmTrafficDescrParamTable
-- using its atmTrafficDescrParamIndex value.
-- The management application can then compare a set of
-- ATM traffic parameters with a single value.
-- If no suitable row(s) in the atmTrafficDescrParamTable
-- exists, the manager must create a new row(s) in this
-- table. If such a row is created, agent checks the
-- sanity of that set of ATM traffic parameter values.
-- The manager may use atmTrafficDescrParamIndexNext
-- in order to obtain a free atmTrafficDescrParamIndex
-- value.
-- When creating a new row, the parameter values
-- will be checked for self-consistency.
-- Predefined/template rows may be supported.
-- A row in the atmTrafficDescrParamTable is deleted
-- by setting the atmTrafficDescrRowStatus to destroy(6).
-- The agent will check whether this row is still in use
-- by any entry of the atmVplTable or atmVclTable.
-- The agent denies the request if the row is still in
-- use.
-- The ATM Traffic Descriptor Parameter Table
atmTrafficDescrParamTable OBJECT-TYPE
SYNTAX SEQUENCE OF AtmTrafficDescrParamEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains information on ATM traffic
descriptor type and the associated parameters."
::= { atmMIBObjects 5}
atmTrafficDescrParamEntry OBJECT-TYPE
SYNTAX AtmTrafficDescrParamEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This list contains ATM traffic descriptor
type and the associated parameters."
INDEX {atmTrafficDescrParamIndex}
::= { atmTrafficDescrParamTable 1}
AtmTrafficDescrParamEntry ::= SEQUENCE {
atmTrafficDescrParamIndex AtmTrafficDescrParamIndex,
atmTrafficDescrType OBJECT IDENTIFIER,
atmTrafficDescrParam1 Integer32,
atmTrafficDescrParam2 Integer32,
atmTrafficDescrParam3 Integer32,
atmTrafficDescrParam4 Integer32,
atmTrafficDescrParam5 Integer32,
atmTrafficQoSClass INTEGER,
atmTrafficDescrRowStatus RowStatus,
atmServiceCategory AtmServiceCategory,
atmTrafficFrameDiscard TruthValue
}
atmTrafficDescrParamIndex OBJECT-TYPE
SYNTAX AtmTrafficDescrParamIndex (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object is used by the virtual link
table (i.e., VPL or VCL table)
to identify the row of this table.
When creating a new row in the table
the value of this index may be obtained
by retrieving the value of
atmTrafficDescrParamIndexNext."
::= { atmTrafficDescrParamEntry 1}
atmTrafficDescrType OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value of this object identifies the type
of ATM traffic descriptor.
The type may indicate no traffic descriptor or
traffic descriptor with one or more parameters.
These parameters are specified as a parameter
vector, in the corresponding instances of the
objects:
atmTrafficDescrParam1
atmTrafficDescrParam2
atmTrafficDescrParam3
atmTrafficDescrParam4
atmTrafficDescrParam5."
DEFVAL { atmNoClpNoScr }
::= { atmTrafficDescrParamEntry 2}
atmTrafficDescrParam1 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The first parameter of the ATM traffic descriptor
used according to the value of
atmTrafficDescrType."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 3}
atmTrafficDescrParam2 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The second parameter of the ATM traffic descriptor
used according to the value of
atmTrafficDescrType."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 4}
atmTrafficDescrParam3 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The third parameter of the ATM traffic descriptor
used according to the value of
atmTrafficDescrType."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 5}
atmTrafficDescrParam4 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The fourth parameter of the ATM traffic descriptor
used according to the value of
atmTrafficDescrType."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 6}
atmTrafficDescrParam5 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The fifth parameter of the ATM traffic descriptor
used according to the value of
atmTrafficDescrType."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 7}
atmTrafficQoSClass OBJECT-TYPE
SYNTAX INTEGER (0..255)
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"The value of this object identifies the QoS Class.
Four Service classes have been
specified in the ATM Forum UNI Specification:
Service Class A: Constant bit rate video and
Circuit emulation
Service Class B: Variable bit rate video/audio
Service Class C: Connection-oriented data
Service Class D: Connectionless data
Four QoS classes numbered 1, 2, 3, and 4 have
been specified with the aim to support service
classes A, B, C, and D respectively.
An unspecified QoS Class numbered `0" is used
for best effort traffic."
DEFVAL { 0 }
::= { atmTrafficDescrParamEntry 8}
atmTrafficDescrRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used to create
a new row or modify or delete an
existing row in this table."
DEFVAL { active }
::= {atmTrafficDescrParamEntry 9}
atmServiceCategory OBJECT-TYPE
SYNTAX AtmServiceCategory
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The ATM service category."
DEFVAL { ubr }
::= { atmTrafficDescrParamEntry 10}
atmTrafficFrameDiscard OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If set to "true", this object indicates that the network
is requested to treat data for this connection, in the
given direction, as frames (e.g. AAL5 CPCS_PDU"s) rather
than as individual cells. While the precise
implementation is network-specific, this treatment may
for example involve discarding entire frames during
congestion, rather than a few cells from many frames."
DEFVAL { true }
::= { atmTrafficDescrParamEntry 11 }
-- ATM Interface Virtual Path Link (VPL) Table
-- This table contains configuration and state
-- information of a bi-directional Virtual Path Link
-- (VPL)
-- This table can be used to create, delete or modify
-- a VPL that is terminated in an ATM host or switch.
-- This table can also be used to create, delete or
-- modify a VPL which is cross-connected to another
-- VPL.
-- In the example below, the traffic flows on the receive
-- and transmit directions of the VPLs are characterized
-- by atmVplReceiveTrafficDescrIndex and
-- atmVplTransmitTrafficDescrIndex respectively.
-- The cross-connected VPLs are identified by
-- atmVplCrossConnectIdentifier.
-- ________________________________
--
-- VPL ATM Host, Switch, or Network VPL
-- receive receive
-- ========> X X <=======
-- <======== X X ========>
-- transmit transmit
-- ______________________________
-- The ATM Interface VPL Table
atmVplTable OBJECT-TYPE
SYNTAX SEQUENCE OF AtmVplEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The Virtual Path Link (VPL) table. A
bi-directional VPL is modeled as one entry
in this table. This table can be used for
PVCs, SVCs and Soft PVCs.
Entries are not present in this table for
the VPIs used by entries in the atmVclTable."
::= { atmMIBObjects 6}
atmVplEntry OBJECT-TYPE
SYNTAX AtmVplEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the VPL table. This entry is
used to model a bi-directional VPL.
To create a VPL at an ATM interface,
either of the following procedures are used:
Negotiated VPL establishment
(1) The management application creates
a VPL entry in the atmVplTable
by setting atmVplRowStatus to createAndWait(5).
This may fail for the following reasons:
- The selected VPI value is unavailable,
- The selected VPI value is in use.
Otherwise, the agent creates a row and
reserves the VPI value on that port.
(2) The manager selects an existing row(s) in the
atmTrafficDescrParamTable,
thereby, selecting a set of self-consistent
ATM traffic parameters and the service category
for receive and transmit directions of the VPL.
(2a) If no suitable row(s) in the
atmTrafficDescrParamTable exists,
the manager must create a new row(s)
in that table.
(2b) The manager characterizes the VPL"s traffic
parameters through setting the
atmVplReceiveTrafficDescrIndex and the
atmVplTransmitTrafficDescrIndex values
in the VPL table, which point to the rows
containing desired ATM traffic parameter values
in the atmTrafficDescrParamTable. The agent
will check the availability of resources and
may refuse the request.
If the transmit and receive service categories
are inconsistent, the agent should refuse the
request.
(3) The manager activates the VPL by setting the
the atmVplRowStatus to active(1).
If this set is successful, the agent has
reserved the resources to satisfy the requested
traffic parameter values and the service category
for that VPL.
(4) If the VPL terminates a VPC in the ATM host
or switch, the manager turns on the
atmVplAdminStatus to up(1) to turn the VPL
traffic flow on. Otherwise, the
atmVpCrossConnectTable must be used
to cross-connect the VPL to another VPL(s)
in an ATM switch or network.
One-Shot VPL Establishment
A VPL may also be established in one step by a
set-request with all necessary VPL parameter
values and atmVplRowStatus set to createAndGo(4).
In contrast to the negotiated VPL establishment
which allows for detailed error checking
(i.e., set errors are eXPlicitly linked to
particular resource acquisition failures),
the one-shot VPL establishment
performs the setup on one operation but
does not have the advantage of step-wise
error checking.
VPL Retirement
A VPL is released by setting atmVplRowStatus to
destroy(6), and the agent may release all
associated resources."
INDEX {ifIndex, atmVplVpi }
::= { atmVplTable 1}
AtmVplEntry ::= SEQUENCE {
atmVplVpi AtmVpIdentifier,
atmVplAdminStatus AtmVorXAdminStatus,
atmVplOperStatus AtmVorXOperStatus,
atmVplLastChange AtmVorXLastChange,
atmVplReceiveTrafficDescrIndex
AtmTrafficDescrParamIndex,
atmVplTransmitTrafficDescrIndex
AtmTrafficDescrParamIndex,
atmVplCrossConnectIdentifier INTEGER,
atmVplRowStatus RowStatus,