Table Of Contents

Asynchronous Transfer Mode

Technology Description

ATM

IMA

Inventory and Information Model Objects (IMOs)

ATM Interface

ATM Virtual Connection

Inverse Multiplexing for ATM (IMA) Group

ATM Traffic Descriptor

ATM Traffic Shape Descriptor

Vendor-Specific Inventory and IMOs

Lucent ATM Trunk Interface

Cisco or Lucent ATM Logical Interface

Cisco or Lucent ATM Trunk Virtual Connection

Cisco or Lucent ATM Soft Permanent Virtual Connection

Alcatel ASAM ATM Interface

ECI HiFocus ATM Interface

Alcatel ASAM ATM Traffic Descriptor

ECI HiFocus ATM Traffic Descriptor

Lucent WAN Switch ATM Traffic Descriptor

Alcatel ATM Access Traffic Descriptor

Alcatel ASAM Access Traffic Descriptor

Network Topology

Service Alarms

Asynchronous Transfer Mode

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This chapter describes the level of support that Cisco ANA provides for ATM, as follows:

•Technology Description

•Inventory and Information Model Objects (IMOs)

•Vendor-Specific Inventory and IMOs

•Network Topology

•Service Alarms

Technology Description

ATM

ATM is a cell-switching and multiplexing technology that combines the benefits of circuit switching (guaranteed capacity and constant transmission delay) with those of packet switching (flexibility and efficiency for intermittent traffic). It provides data link (Layer 2) services with scalable bandwidth from a few megabits per second (Mb/s) to many gigabits per second (Gb/s), which usually run over SONET/SDH physical (Layer 1) links.

ATM networks consist of ATM switches interconnected by point-to-point ATM links or interfaces and are fundamentally connection oriented, which means that a virtual channel (VC) must be set up across the ATM network prior to any data transfer.

IMA

Inverse Multiplexing over ATM (IMA) involves inverse multiplexing and demultiplexing of ATM cells in a cyclical fashion among physical links grouped to form a higher bandwidth and logical link. The rate of the logical link is approximately the sum of the rate of the physical links in the IMA group. Streams of cells are distributed in a round-robin manner across the multiple T1/E1 links and reassembled at the destination to form the original cell stream. Sequencing is provided using IMA Control Protocol (ICP) cells.

The ATM cell stream received from the ATM layer is distributed on a cell-by-cell basis across the multiple links within the IMA group. At the far end, the receiving IMA unit reassembles the cells from each link on a cell-by-cell basis, recreates the original ATM cell stream, and passes it to the ATM layer.

Inventory and Information Model Objects (IMOs)

This section describes the following IMOs:

•ATM Interface (IAtm)

•ATM Virtual Connection (IAtmVc)

•Inverse Multiplexing for ATM (IMA) Group (IIMAGroup)

•ATM Traffic Descriptor (IAtmTrafficDescriptor)

•ATM Traffic Shape Descriptor (IAtmTrafficShapingDescriptor)

ATM Interface

The data link layer ATM Interface object aggregates multiple ATM Virtual Connections by its VC Table attributes. It is bound by its Containing Termination Points attribute to a physical layer interface. It is accessed primarily by the Virtual Connection Switching Entity and VC Encapsulation Multiplexer bound by its Contained Connection Termination Points attribute. It is also accessed by the Virtual Connection Switching Entity.

Table 5-1 ATM Interface (IAtm)

Attribute Name	Attribute Description	Scheme	Polling Interval
ATM Address	ATM 20-byte address (Address Prefix | MAC Address | Address Selector)	Any	Configuration
Interface Type	ATM interface type (N/A, Private UNI, Public UNI, Private NNI, Public NNI, NNI, UNI, STI, Unconfigured, VNNI, VUNI, EVNNI, EVUNI, VP TRUNK UNI)	Any	Configuration
VP and VC Ranges	Numeric ranges of the allowed Virtual Path Identifier/Virtual Channel Identifier (VPI/VCI) values	Any	Configuration
VC Table	Array of ATM Virtual Connections	Any	Configuration
Cross Connect Table	Array of Virtual Cross Connections	Any	Configuration
IANA Type	Internet Assigned Numbers Authority (IANA) type of the sublayer	N/A	N/A
Containing Termination Points	Underlying termination points (connection or physical)	Any	N/A
Contained Connection Termination Points	Bound connection termination points	Any	N/A

ATM Virtual Connection

The data link layer ATM Virtual Connection object is bound by its Containing Termination Points attribute to a data link layer ATM Interface object. It is accessed primarily by the Virtual Cross Connection and data link layer VC Encapsulation, but is not bound to any of them by any of its attributes.

Table 5-2 ATM Virtual Connection (IAtmVc)

Attribute Name	Attribute Description	Scheme	Polling Interval
Virtual Channel Identifier	Virtual Channel Identifier (VCI)	Any	Configuration
Virtual Path Identifier	Virtual Path Identifier (VPI)	Any	Configuration
Shaping Profile	Shaping profile (ATM Traffic Shape Descriptor)	Any	Configuration
Discarded and Received Input Data Counters	Discarded and received input octets and reassembled packet counters	Any	Topology L2
Dropped and Forward Output Data Counters	Dropped and forwarded output octets and reassembled packet counters	Any	Topology L2
Ingress Traffic Descriptor	Ingress traffic descriptor (ATM Traffic Descriptor)	Any	Configuration
Egress Traffic Descriptor	Egress traffic descriptor (ATM Traffic Descriptor)	Any	Configuration
Administrative Status	Administrative status (Unknown, Up, Down)	Any	Status
Operational Status	Operational status (Unknown, Up, Down)	Any	Status
IANA Type	Internet Assigned Numbers Authority (IANA) type of the sublayer	N/A	N/A
Containing Termination Points	Underlying termination points (connection or physical)	Any	N/A
Contained Connection Termination Points	Bound connection termination points	Any	N/A

Inverse Multiplexing for ATM (IMA) Group

The Inverse Multiplexing for ATM (IMA) Group object is bound to its multiplex multiple DS1 Physicals by its Containing Termination Points attribute. It is accessed by a single data link layer ATM Interface.

Table 5-3 Inverse Multiplexing for ATM (IMA) Group (IIMAGroup) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Description	IMA port description	Any	Configuration
Speed	Group aggregated speed	Any	Configuration
Administrative Status	Administrative status (Unknown, Up, Down, Testing)	Any	Status
Operational Status	Operational status (Unknown, Up, Down, Testing, Dormant, Not Presented)	Any	Status
Operational Status Last Change	Date of last operational status change	Any	Configuration
IANA Type	Internet Assigned Numbers Authority (IANA) type of the sublayer	N/A	N/A
Containing Termination Points	Underlying termination points (DS1 Physicals)	Any	N/A

ATM Traffic Descriptor

The ATM Traffic Descriptor object describes the traffic of a single ATM Virtual Connection. It is aggregated by a Traffic Descriptor Container object (see Common Components).

Table 5-4 ATM Traffic Descriptor (IAtmTrafficDescriptor)

Attribute Name	Attribute Description	Scheme	Polling Interval
Traffic Descriptor Type	ATM traffic descriptor type (Null, Best Effort, No CLP and no SCR, CLP with no tagging and no SCR, CLP with tagging and no SCR, No CLP with SCR, CLP with no tagging and with SCR, CLP with tagging and with SCR, CLP with no tagging and with MCR, CLP-transparent with no SCR, CLP-transparent with SCR, No CLP with tagging and no SCR, No CLP and no SCR with CDVT, No CLP with SCR and CDVT, No CLP and no SCR with CDVT, No CLP with SCR and CDVT)	Any	Configuration
Service Category	ATM service category (Unknown, UBR, UBR1, UBR2, CBR, CBR1, CBR2, CBR3, ABR, RT VBR, NRT VBR, VBR, VBR1RT, VBR2RT, VBR3RT, VBR1NRT, VBR2NRT, VBR3NRT, GFR)	Any	Configuration
Cell Loss Priority	Cell loss priority (Unknown, True, False)	Any	Configuration
Cell Delay Variation	Cell delay variation	Any	Configuration
Cell Delay Variation Tolerance	Cell delay variation tolerance	Any	Configuration
Maximum High Priority and Aggregate Burst Sizes	Maximum high priority and aggregate (CLP=0 and CLP=0+1) burst sizes	Any	Configuration
Minimum High Priority and Aggregate Cell Rates	Minimum high priority and aggregate (CLP=0 and CLP=0+1) cell rates	Any	Configuration
Sustainable High Priority and Aggregate Cell Rates	Sustainable high priority and aggregate (CLP=0 and CLP=0+1) cell rates	Any	Configuration
Peak High Priority and Aggregate Cell Rates	Peak high priority and aggregate (CLP=0 and CLP=0+1) cell rates	Any	Configuration
Name	Traffic descriptor name	Any	Configuration
Index	Traffic descriptor index	Any	Configuration

ATM Traffic Shape Descriptor

The ATM Traffic Shape Descriptor object describes the traffic shape of a single ATM Virtual Connection. It is aggregated by a Traffic Descriptor Container object (see Common Components).

Table 5-5 ATM Traffic Shape Descriptor (IAtmTrafficShapingDescriptor)  

Attribute Name	Attribute Description	Scheme	Polling Interval
Maximum Burst Size	Maximum burst sizes	Any	Configuration
Sustainable and Peak Cell Rates	Sustainable and peak cell rates	Any	Configuration
Cell Delay Variation	Cell delay variation	Any	Configuration
State	Descriptor state (Null, Enabled, Disabled)	Any	Configuration
Buffer Size	Buffer size	Any	Configuration
Cell Loss Priority Discarded Size	Cell loss priority discarded size	Any	Configuration
Name	Traffic descriptor name	Any	Configuration
Index	Traffic descriptor index	Any	Configuration

Vendor-Specific Inventory and IMOs

Vendor-specific IMOs are implemented only for specific vendor devices. The following sections describe vendor-specific objects for this technology:

•Lucent ATM Trunk Interface

•Cisco or Lucent ATM Logical Interface

•Cisco or Lucent ATM Trunk Virtual Connection

•Cisco or Lucent ATM Soft Permanent Virtual Connection

•Alcatel ASAM ATM Interface

•ECI HiFocus ATM Interface

•Alcatel ASAM ATM Traffic Descriptor

•ECI HiFocus ATM Traffic Descriptor

•Lucent WAN Switch ATM Traffic Descriptor

•Alcatel ATM Access Traffic Descriptor

•Alcatel ASAM Access Traffic Descriptor

Lucent ATM Trunk Interface

The Lucent ATM Trunk Interface data link layer object aggregates multiple ATM Virtual Connections, to which it is bound by its VC Table attributes. It is bound by its Containing Termination Points attribute to a physical layer interface. It is accessed primarily by a Virtual Connection Switching Entity bound by its Contained Connection Termination Points attribute.

Table 5-6 Lucent ATM Trunk Interface (IAtmTrunk)

Attribute Name	Attribute Description	Scheme	Polling Interval
All attributes are the same as ATM Interface (IAtm)

Cisco or Lucent ATM Logical Interface

The Cisco or Lucent ATM Logical Interface data link layer object aggregates multiple ATM Virtual Connections, to which it is bound by its VC Table attributes. It is bound by its Containing Termination Points attribute to a physical layer interface. It is accessed primarily by a Virtual Connection Switching Entity and data link layer VC Encapsulation bound by its Contained Connection Termination Points attribute.

Table 5-7 Cisco or Lucent ATM Logical Interface (IAtmLogicalPort/Trunk)

Attribute Name	Attribute Description	Scheme	Polling Interval
Resource Management Cell Termination	Resource management cell termination (Unknown, CCRM Only, CCRM, BCM)	Any	Configuration
Resource Management Cell Generation	Resource management cell generation (Unknown, None, CCRM, BCM)	Any	Configuration
Effective Check	Effective check (Unknown, No, Yes)	Any	Configuration
Input and Output Capacities	Input and output capacities	Any	Configuration
Administrative Status	Administrative status (Null, Up, Down, Testing)	Any	Status
Operational Status	Operational status (Null, Up, Down, Testing, Unknown, Dormant, Not Present)	Any	Status
All additional attributes are the same as ATM Interface (IAtm)

Cisco or Lucent ATM Trunk Virtual Connection

The Cisco or Lucent ATM Trunk Virtual Connection and Cisco or Lucent ATM Soft Permanent Virtual Connection data link layer objects are bound by their Containing Termination Points attributes to an ATM Interface object. They are accessed primarily by a Virtual Cross Connection object, although they are not bound to it by any of their attributes.

Table 5-8 Cisco or Lucent ATM Trunk Virtual Connection (IAtmTrunkVc)

Attribute Name	Attribute Description	Scheme	Polling Interval
Destination Description	Destination party description	Any	Configuration
All additional attributes are the same as ATM Virtual Connection (IAtmVc)

Cisco or Lucent ATM Soft Permanent Virtual Connection

Table 5-9 Cisco or Lucent ATM Soft Permanent Virtual Connection (IAtmSpVc)

Attribute Name	Attribute Description	Scheme	Polling Interval
Remote Virtual Channel Identifier	Remote Virtual Channel Identifier (VCI)	Any	Configuration
Remote Virtual Path Identifier	Remote Remote Virtual Path Identifier (VPI)	Any	Configuration
Remote Network Service Access Point	Remote Network Service Access Point (NSAP), which is the destination ATM address	Any	Configuration
All additional attributes are the same as ATM Virtual Connection (IAtmVc)

Alcatel ASAM ATM Interface

The Alcatel ASAM ATM Interface and ECI HiFocus ATM Interface data link layer objects aggregate multiple ATM Virtual Connections, which they are bound to by their VC Table attributes. They are bound by their Containing Termination Points attributes to a physical layer interface. They are accessed primarily by Virtual Connection Switching Entity and data link layer VC Encapsulation objects bound by their Contained Connection Termination Points attributes.

Table 5-10 Alcatel ASAM ATM Interface (IAsamAtm)

Attribute Name	Attribute Description	Scheme	Polling Interval
CAC Traffic Descriptor	Connection admission control (CAC) traffic descriptor (Alcatel ASAM ATM Traffic Descriptor)	Product	Configuration
Access Traffic Descriptor	Access traffic descriptor (Alcatel ASAM Access Traffic Descriptor)	Product	Configuration
All additional attributes are the same as ATM Interface (IAtm)

ECI HiFocus ATM Interface

Table 5-11 ECI HiFocus ATM Interface (IHiFocusAtm)

Attribute Name	Attribute Description	Scheme	Polling Interval
CAC Traffic Descriptor	Connection admission control (CAC) traffic descriptor (ECI HiFocus ATM Traffic Descriptor)	Product	Configuration
Access Traffic Descriptor	Access traffic descriptor (Alcatel ATM Access Traffic Descriptor)	Product	Configuration
All additional attributes are the same as ATM Interface (IAtm)

Alcatel ASAM ATM Traffic Descriptor

The following objects — Alcatel ASAM ATM Traffic Descriptor, ECI HiFocus ATM Traffic Descriptor, Lucent WAN Switch ATM Traffic Descriptor and Lucent WAN Switch ATM Traffic Descriptor — describe traffic of a single ATM Virtual Connection. They are aggregated by a Traffic Descriptor Container object.

Table 5-12 Alcatel ASAM ATM Traffic Descriptor (IAsamAtmTrafficDescriptor)

Attribute Name	Attribute Description	Scheme	Polling Interval
User VP and VC Ranges	Numeric ranges of the allowed user VPI/VCI values	Product	Configuration
All additional attributes are the same as ATM Traffic Descriptor (IAtmTrafficDescriptor)

ECI HiFocus ATM Traffic Descriptor

Table 5-13 ECI HiFocus ATM Interface (IHiFocusAtm)

Attribute Name	Attribute Description	Scheme	Polling Interval
Service Category	ATM service category (Unspecified)	Product	Configuration
All additional attributes are the same as ATM Traffic Descriptor (IAtmTrafficDescriptor)

Lucent WAN Switch ATM Traffic Descriptor

Table 5-14 Lucent's WAN Switch ATM Traffic Descriptor (ILucentWANSwitchAtmTrafficDescriptor)

Attribute Name	Attribute Description	Scheme	Polling Interval
Priority	Connection priority	Product	Configuration
Type	Connection type	Product	Configuration
All additional attributes are the same as ATM Traffic Descriptor (IAtmTrafficDescriptor)

Alcatel ATM Access Traffic Descriptor

The Alcatel ATM Access Traffic Descriptor object describes access traffic of a single ATM Virtual Connection. It is aggregated by a Traffic Descriptor Container.

Table 5-15 Alcatel ATM Access Traffic Descriptor (IAtmAccessTrafficDescriptor) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Scope	Access scope (Null, Local, Network)	Product	Configuration
Maximum Active VPCs and VCCs	Maximum active virtual path and virtual channel connections	Product	Configuration
Maximum Supported VPI and VCI Bits	Maximum supported virtual path and virtual channel bits	Product	Configuration
Generic Flow Control Mode	Generic flow control mode (Null, UNI, NNI)	Product	Configuration
Police Mode	Police mode (Null, None, VC Only, All)	Product	Configuration
Name	Traffic descriptor name	Product	Configuration
Index	Traffic descriptor index	Product	Configuration

Alcatel ASAM Access Traffic Descriptor

Alcatel ASAM Access Traffic Descriptor object describes access traffic of a single ATM Virtual Connection. It is aggregated by a Traffic Descriptor Container.

Table 5-16 Alcatel ASAM Access Traffic Descriptor (IAsamAccessTrafficDescriptor)

Attribute Name	Attribute Description	Scheme	Polling Interval
Maximum Supported VPCs and VCCs	Maximum supported virtual path and virtual channel connections	Product	Configuration
Maximum Active VPI and VCI Bits	Maximum active virtual path and virtual channel bits	Product	Configuration
All additional attributes are the same as Alcatel ATM Access Traffic Descriptor (IAtmAccessTrafficDescriptor)

Network Topology

Cisco ANA performs discovery of ATM data link layer topology by searching for the same set of active ATM Virtual Connections in any remote side's ATM port VCs table related to the same type of the local ATM port. This topology is also applied to the underlying physical links.

In particular, Cisco ANA looks for harmony between the VCs tables of participating ports based on the lowest active VCs (registry default to 3). Further verification is done by matching the VC traffic signature of these ports using Cisco's confidential scheme, which requires a substantial amount of traffic to function correctly.

This mechanism supports configurations that have either the same VCs or the same VPs on both sides. It does not support a mixture of VCs on one side and VPs on the other side.

Service Alarms

The following alarms are supported for this technology:

•Cloud Problem

•Discard Input Packets/Normal Discard Input Packets

•Dropped Output Packets/Normal Dropped Output Packets

•Link Down/Link Up

•Port Down/Port Up

•Receive Utilization/Receive Utilization Normal

•Transmit Utilization/Transmit Utilization Normal

Note that these alarms, apart from Cloud Problem, are related to the underlying physical interface (see Common Components).

For detailed information about alarms and correlation, see the Cisco Active Network Abstraction 3.6.6 User Guide.