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Cisco Active Network Abstraction Technology Support and Information Model Reference Manual, 3.6
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Introduction
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Internet Protocol "IP"
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Routing Protocols "BGP/OSPF"
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Ethernet (IEEE 802.3)
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Token Ring "TR" (IEEE 802.5)
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Asynchronous Transfer Mode "ATM"
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Frame Relay "FR"
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Point-to-Point Protocol "PPP" and High Level Data Link Control "HDLC"
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Layer 2 Tunnel Protocol "L2TP"
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Digital Subscriber Line "DSL" and Integrated Services Digital Network "ISDN"
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Physical Technologies
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Multiprotocol Label Switching "MPLS"
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Multi Protocol Label Switching Traffic Engineering (MPLS-TE)
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Virtual Private Networks "VPNs"
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Pseudo Wire Emulation Edge to Edge (PWE3)
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Quality of Service "QoS"
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Physical Equipment
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Base Logical Components
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Common (Shared by Several)
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Feedback
Table Of Contents
Asynchronous Transfer Mode "ATM"
Inventory and Information Model Objects (IMOs)
Inverse Multiplexing for ATM (IMA) Group
Vendor Specific Inventory and Information Model Objects
Cisco or Lucent's ATM Logical Interface
Cisco or Lucent's ATM Trunk Virtual Connection
Cisco or Lucent's ATM Soft Permanent Virtual Connection
Alcatel's ASAM ATM Traffic Descriptor
ECI's HiFocus ATM Traffic Descriptor
Lucent's WAN Switch ATM Traffic Descriptor
Alcatel's ATM Access Traffic Descriptor
Alcatel's ASAM Access Traffic Descriptor
Asynchronous Transfer Mode "ATM"
This chapter describes the level of support that Cisco ANA provides for ATM and IMA, as follows:
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Inventory and Information Model Objects (IMOs)
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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 (Mbps) to many gigabits per second (Gbps), which usually run over Synchronous Optical NETwork/Digital Hierarchy (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 and recreates the original ATM cell stream and passed to the ATM layer.
Inventory and Information Model Objects (IMOs)
This section includes the following tables:
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ATM Interface
The following 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, and is primarily being accessed by the Virtual Connection Switching Entity and VC Encapsulation Multiplexer bound by its Contained Connection Termination Points attribute. It is also being accessed by Virtual Connection Switching Entity.
Table 6-1 ATM Interface (IAtm)
ATM Address
ATM 20 byte address (Address Prefix | MAC Address | Address Selector)
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)
VP and VC Ranges
Numeric ranges of the allowed VPI/VCI values
VC Table
Array of ATM Virtual Connections
Cross Connect Table
Array of Virtual Cross Connections
IANA Type
IANA type of the sub/layer
Containing Termination Points
Underlying termination points (connection or physical)
Contained Connection Termination Points
Bound Connection Termination Points
ATM Virtual Connection
The following Data Link layer ATM Virtual Connection object, is bound by its Containing Termination Points attribute to a Data Link layer ATM Interface object, and is primarily accessed by the Virtual Cross Connection and Data Link layer VC Encapsulation, however it is not bound to any of them by any of its attributes.
Table 6-2 ATM Virtual Connection (IAtmVc)
Virtual Channel Identifier
Virtual Channel Identifier (VCI)
Virtual Path Identifier
Virtual Path Identifier (VPI)
Shaping Profile
Shaping profile (ATM Traffic Shape Descriptor)
Discarded and Received
Input Data Counters
Discarded and received input octets and reassembled packets counters
Dropped and Forward
Output Data Counters
Dropped and forward output octets and reassembled packets counters
Ingress Traffic Descriptor
Ingress traffic descriptor (ATM Traffic Descriptor)
Egress Traffic Descriptor
Egress traffic descriptor (ATM Traffic Descriptor)
Administrative Status
Administrative status (Unknown, Up, Down)
Operational Status
Operational status (Unknown, Up, Down)
IANA Type
IANA type of the sub/layer
Containing Termination Points
Underlying termination points (connection or physical)
Contained Connection Termination Points
Bound Connection Termination Points
Inverse Multiplexing for ATM (IMA) Group
The following Inverse Multiplexing for ATM (IMA) Group object, multiplex multiple Digital Signalling 1 Physicals, which it is bound to by its Containing Termination Points attribute, into a single Data Link layer ATM Interface, by which it is accessed.
Table 6-3 Inverse Multiplexing for ATM (IMA) Group (IIMAGroup)
Description
IMA port description
Speed
Group aggregated speed
Administrative Status
Administrative status (Unknown, Up, Down, Testing)
Operational Status
Operational status (Unknown, Up, Down, Testing, Dormant, Not Presented)
Operational Status Last Change
Date of last operational status change
IANA Type
IANA type of the sub/layer
Containing Termination Points
Underlying termination points (Digital Signalling 1 Physicals)
ATM Traffic Descriptor
The following ATM Traffic Descriptor object describes traffic of a single ATM Virtual Connection, which it is being aggregated by a Traffic Descriptor Container object (see Common (Shared by Several)).
ATM Traffic Shape Descriptor
The following ATM Traffic Shape Descriptor object describes the traffic shape of a single ATM Virtual Connection and is being aggregated by a Traffic Descriptor Container object (see Common (Shared by Several)).
Vendor Specific Inventory and Information Model Objects
Vendor specific Information Model Objects are implemented only for specific devices of the vendor.
The following sections describe the objects of specific vendors:
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Lucent's ATM Trunk Interface
Lucent's ATM Trunk Interface Data Link layer object aggregates multiple ATM Virtual Connections, which it is bound to by its VC Table attributes. It is bound by its Containing Termination Points attribute to a Physical Layer Interface, and is primarily accessed by a Virtual Connection Switching Entity bound by its Contained Connection Termination Points attribute.
Table 6-6 Lucent's ATM Trunk Interface (IAtmTrunk)
Same as ATM Interface (IAtm) - see Table 6-1.
Cisco or Lucent's ATM Logical Interface
Cisco or Lucent's ATM Logical Interface Data Link layer object aggregates multiple ATM Virtual Connections, which it is bound to by its VC Table attributes. It is bound by its Containing Termination Points attribute to a Physical Layer Interface, and is primarily accessed by a Virtual Connection Switching Entity and Data Link layer VC Encapsulation bound by its Contained Connection Termination Points attribute.
Table 6-7 Cisco or Lucent's ATM Logical Interface (IAtmLogicalPort/Trunk)
Resource Management Cell Termination
Resource management cell termination (Unknown, CCRM Only, CCRM & BCM)
Resource Management Cell Generation
Resource management cell generation (Unknown, None, CCRM, BCM)
Effective Check
Effective check (Unknown, No, Yes)
Input and Output Capacities
Input and output capacities
Administrative Status
Administrative status (Null, Up, Down, Testing)
Operational Status
Operational status (Null, Up, Down, Testing, Unknown, Dormant, Not Present)
Same as ATM or ATM Trunk Interface - see Table 6-1.
Cisco or Lucent's ATM Trunk Virtual Connection
Cisco or Lucent's ATM Trunk Virtual Connection and Cisco or Lucent's ATM Soft Permanent Virtual Connection Data Link layer objects, are bound by their Containing Termination Points attributes to an ATM Interface object, and are primarily accessed by a Virtual Cross Connection object, although they are not bound to it by any of their attributes.
Table 6-8 Cisco or Lucent's ATM Trunk Virtual Connection (IAtmTrunkVc)
Destination Description
Destination party description
Same as ATM Virtual Connection (IAtmVc) - see Table 6-2.
Cisco or Lucent's ATM Soft Permanent Virtual Connection
Table 6-9 Cisco or Lucent's ATM Soft Permanent Virtual Connection (IAtmSpVc)
Remote Virtual Channel Identifier
Remote virtual channel identifier (VCI)
Remote Virtual Path Identifier
Remote virtual path iIdentifier (VPI)
Remote Network Service Access Point
Remote network service access point (NSAP), which is the destination ATM address
Same as ATM Virtual Connection (IAtmVc) - see Table 6-2.
Alcatel's ASAM ATM Interface
Alcatel's ASAM ATM Interface and ECI's 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, and are primarily accessed by Virtual Connection Switching Entity and Data Link layer VC Encapsulation objects bound by their Contained Connection Termination Points attributes.
Table 6-10 Alcatel's ASAM ATM Interface (IAsamAtm)
CAC Traffic Descriptor
Connection Admission Control (CAC) traffic descriptor (Alcatel's ASAM ATM Traffic Descriptor)
Access Traffic Descriptor
Access traffic descriptor (Alcatel's ASAM Access Traffic Descriptor)
Same as ATM Interface (IAtm) - see Table 6-1.
ECI's HiFocus ATM Interface
Table 6-11 ECI's HiFocus ATM Interface (IHiFocusAtm)
CAC Traffic Descriptor
Connection Admission Control (CAC) traffic descriptor (ECI's HiFocus ATM Traffic Descriptor)
Access Traffic Descriptor
Access traffic descriptor (Alcatel's ATM Access Traffic Descriptor)
Same as ATM Interface (IAtm) - see Table 6-1.
Alcatel's ASAM ATM Traffic Descriptor
The following objects—Alcatel's ASAM ATM Traffic Descriptor, ECI's HiFocus ATM Traffic Descriptor, Lucent's WAN Switch ATM Traffic Descriptor and Lucent's WAN Switch ATM Traffic Descriptor describe traffic of a single ATM Virtual Connection, and are aggregated by a Traffic Descriptor Container object.
Table 6-12 Alcatel's ASAM ATM Traffic Descriptor (IAsamAtmTrafficDescriptor)
User VP and VC Ranges
Numeric ranges of the allowed user VPI/VCI values
Same as ATM Traffic Descriptor (IAtmTrafficDescriptor) - see Table 6-4.
ECI's HiFocus ATM Traffic Descriptor
Table 6-13 ECI's HiFocus ATM Interface (IHiFocusAtm)
Service Category
ATM service category (Unspecified)
Same as ATM Traffic Descriptor (IAtmTraffic Descriptor) - see Table 6-4.
Lucent's WAN Switch ATM Traffic Descriptor
Table 6-14 Lucent's WAN Switch ATM Traffic Descriptor (ILucentWANSwitchAtmTrafficDescriptor)
Priority
Connection pPriority
Type
Connection type
Same as ATM Traffic Descriptor (IAtmTrafficDescriptor) - see Table 6-4.
Alcatel's ATM Access Traffic Descriptor
Alcatel's ATM Access Traffic Descriptor object describes access traffic of a single ATM Virtual Connection, and is aggregated by a Traffic Descriptor Container.
Alcatel's ASAM Access Traffic Descriptor
Alcatel's ASAM Access Traffic Descriptor object describes access traffic of a single ATM Virtual Connection, and is aggregated by a Traffic Descriptor Container.
Table 6-16 Alcatel's ASAM Access Traffic Descriptor (IAsamAccessTrafficDescriptor)
Maximum Supported VPCs and VCCs
Maximum supported virtual path and virtual channel connections
Maximum Active VPI and VCI Bits
Maximum active virtual path and virtual channel bits
Same as ATM Access Traffic Descriptor (IAtmAccessTrafficDescriptor) - see Table 6-15.
Network Topology
The discovery of Asynchronous Transfer Mode (ATM) Data Link layer topology is done 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 it 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 traffic amount in order to function correctly.
This mechanism support configuration that have on both sides either the same VCs or the same VPs. However it does not support a mixture of VCs on one side and VPs on the other one.
Service Alarms
The following alarms are supported for this technology:
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