CISCO-IETF-PW-ATM-MIB

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Organization: Cisco Systems, Inc

Last Updated: 2005-04-19

Category: ATM, Cisco Devices, Pseudowire

Description: Manages ATM pseudowire emulation over MPLS/IP networks, including ATM cell relay and AAL5 service configuration.

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What Is CISCO-IETF-PW-ATM-MIB?

CISCO-IETF-PW-ATM-MIB manages ATM pseudowire emulation over packet-switched (MPLS/IP) networks on Cisco devices, allowing ATM cells or AAL5 frames to be carried transparently across an IP/MPLS core. It exposes per-virtual-circuit configuration objects including the associated interface, VPI/VCI values, cell-loss-priority-to-QoS mapping, OAM cell support, QoS scaling factor, cell-packing mode, and maximum number of cells per packet for both local and peer endpoints, plus a row-status column for provisioning. Its monitoring role centers on pseudowire configuration and operational consistency rather than physical hardware: administrators verify that a pseudowire's VPI/VCI and cell-packing parameters match what's expected, and check row status to confirm a pseudowire has been successfully provisioned and is active, with mismatches indicating a misconfigured or down ATM PW. It explicitly reports into the generic IETF PW-MIB, depending on that standard for the VC-independent pseudowire framework while adding ATM-specific configuration and stats. It is deployed on Cisco provider-edge routers offering ATM pseudowire (ATM-over-MPLS) services to customers migrating legacy ATM access onto an IP/MPLS backbone. Engineers can download the CISCO-IETF-PW-ATM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-IETF-PW-ATM-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco provider-edge routers offering ATM-over-MPLS pseudowire services

Monitoring Examples

A service provider engineer would poll cpwVcAtmTable/cpwVcAtmEntry to verify cpwAtmVpi and cpwAtmVci on a provisioned pseudowire match the customer's ATM circuit configuration, and check cpwAtmRowStatus to confirm the entry is active rather than notReady. Comparing cpwAtmMncp against cpwAtmPeerMncp would reveal a cell-packing mismatch between local and remote PE routers that could cause cell reassembly errors. Checking cpwAtmOamCellSupported and cpwAtmCellPacking settings helps diagnose why OAM cells aren't being relayed correctly across the pseudowire.

What Can Be Monitored

pseudowire VPI/VCI configuration
cell-packing mode and max-cells-per-packet (local/peer)
OAM cell support
pseudowire row/provisioning status

Imported Objects

From ATM-TC-MIB

AtmVcIdentifier
AtmVpIdentifier

From CISCO-IETF-PW-MIB

cpwVcIndex

OBJECT-TYPE

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TruthValue

How to Use in IPNetwork Monitor

Example using cpwAtmCellsReceived OID:

Select a Cisco provider-edge router as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cpwAtmCellsReceived into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. This object can be used to obtain the information on the number of cells that were received and sent to the PSN. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
cpwVcAtmMIB	1.3.6.1.4.1.9.10.9000			This MIB contains managed object definitions for Pseudo Wire emulation of ATM over Packet Switched Networks(PSN). This MIB reports to the PW-MIB. The PW-MIB contains structures and MIB associations generic to Pseudo-Wire Virtual Circuit (VC) emulation. VC-specific MIBs (such as this) contain config and stats for specific VC types.
cpwVcAtmNotifications	1.3.6.1.4.1.9.10.9000.0
cpwVcAtmObjects	1.3.6.1.4.1.9.10.9000.1
cpwVcAtmTable	1.3.6.1.4.1.9.10.9000.1.1		not-accessible	This table specifies the information for an ATM interface, VC, VP to be carried over PSN.
cpwVcAtmEntry	1.3.6.1.4.1.9.10.9000.1.1.1		not-accessible	A row in this table represents an ATM interface, VC, VP that needs to be adapted and carried over PSN. This table is indexed by CpwVcIndex in CISCO-IETF-PW-MIB.
NUM cpwAtmIf	1.3.6.1.4.1.9.10.9000.1.1.1.1	InterfaceIndex	read-create	The ATM Interface that receives cells from the ATM network.
OID cpwAtmVpi	1.3.6.1.4.1.9.10.9000.1.1.1.2	AtmVpIdentifier	read-create	VPI value of this ATM VC.
OID cpwAtmVci	1.3.6.1.4.1.9.10.9000.1.1.1.3	AtmVcIdentifier	read-create	VCI value of this ATM VC.
T/F cpwAtmClpQosMapping	1.3.6.1.4.1.9.10.9000.1.1.1.4	TruthValue	read-create	This Object indicates whether the CLP bits are considered when determining the value placed in the Quality of Service fields (e.g. EXP fields of the MPLS Label Stack) of the encapsulating protocol.
ROW cpwAtmRowStatus	1.3.6.1.4.1.9.10.9000.1.1.1.5	RowStatus	read-create	This Object is used to create, modify or delete a row in this table.
T/F cpwAtmOamCellSupported	1.3.6.1.4.1.9.10.9000.1.1.1.6	TruthValue	read-create	This Object indicates whether OAM Cells are transported on this VC.
I32 cpwAtmQosScalingFactor	1.3.6.1.4.1.9.10.9000.1.1.1.7	Integer32	read-create	This Object represents the scaling factor (% value) to be applied to ATM QoS rates when calculating QoS rates for the PSN domain . For example, in the cell transport mode the bandwidth needed in the PSN domain will be higher (since PSN Transport header, PW header, and optional control word have to transmitted with every cell), whereas in the AAL5 mode the bandwidth needed in PSN domain will be less since cell headers will be removed after reassembly.
T/F cpwAtmCellPacking	1.3.6.1.4.1.9.10.9000.1.1.1.8	TruthValue	read-create	This object is used to identify if the VC is configured to do Cell Packing.
I32 cpwAtmMncp	1.3.6.1.4.1.9.10.9000.1.1.1.9	Integer32	read-create	This object indicates the maximum number of cells that get packed in one packet.
I32 cpwAtmPeerMncp	1.3.6.1.4.1.9.10.9000.1.1.1.10	Integer32	read-only	This Object represents the maximum number of cell that can be packed in one packet for peer interface.
INT cpwAtmEncap	1.3.6.1.4.1.9.10.9000.1.1.1.11	INTEGER	read-create	This object indicates if the packet going on the pseudowire is mpls or l2tpv3 encapsulated.
I32 cpwAtmMcptTimeout	1.3.6.1.4.1.9.10.9000.1.1.1.12	Integer32	read-create	This Object represents which MCPT timeout value.
cpwVcAtmPerfTable	1.3.6.1.4.1.9.10.9000.1.2		not-accessible	This table specifies performance-related attributes for an ATM vc, vp and the interface.
cpwVcAtmPerfEntry	1.3.6.1.4.1.9.10.9000.1.2.1		not-accessible	A row in this table represents an ATM interface, VC, VP that needs to be adapted and carried over PSN. This table is indexed by CpwVcIndex in CISCO-IETF-PW-MIB.
C32 cpwAtmCellsReceivedEx	1.3.6.1.4.1.9.10.9000.1.2.1.1	Counter32	read-only	This object can be used to obtain the information on the number of cells that were received and sent to the PSN.
C32 cpwAtmCellsSent	1.3.6.1.4.1.9.10.9000.1.2.1.2	Counter32	read-only	This object can be used to obtain the information on the number of cells that were received from the PSN and sent over the ATM network.
C32 cpwAtmCellsRejected	1.3.6.1.4.1.9.10.9000.1.2.1.3	Counter32	read-only	This Object indicates the number of cells that were rejected by this VC because of policing.
C32 cpwAtmCellsTagged	1.3.6.1.4.1.9.10.9000.1.2.1.4	Counter32	read-only	This Object indicates the number of cells that were Tagged.
C64 cpwAtmHCCellsReceived	1.3.6.1.4.1.9.10.9000.1.2.1.5	Counter64	read-only	High Capacity counter for the number of cells that were received by this VC.
C64 cpwAtmHCCellsRejected	1.3.6.1.4.1.9.10.9000.1.2.1.6	Counter64	read-only	High Capacity counter for the number of cells that were rejected by this VC because of policing.
C64 cpwAtmHCCellsTagged	1.3.6.1.4.1.9.10.9000.1.2.1.7	Counter64	read-only	High Capacity counter for the number of cells that were tagged
C32 cpwAtmAvgCellsPacked	1.3.6.1.4.1.9.10.9000.1.2.1.8	Counter32	read-only	It indicates the Average number of cells that were received in one packet.
C32 cpwAtmPktsReceived	1.3.6.1.4.1.9.10.9000.1.2.1.9	Counter32	read-only	This object can be used to obtain the information on the number of packets that were received and sent to the PSN.
C32 cpwAtmPktsSent	1.3.6.1.4.1.9.10.9000.1.2.1.10	Counter32	read-only	This object indicates the number of packets that were sent to the atm network.
C32 cpwAtmPktsRejected	1.3.6.1.4.1.9.10.9000.1.2.1.11	Counter32	read-only	This object indicates the number of packets that were rejected because of Policing.
cpwVcAtmConformance	1.3.6.1.4.1.9.10.9000.2
cpwVcAtmGroups	1.3.6.1.4.1.9.10.9000.2.1
cpwVcAtmGroup	1.3.6.1.4.1.9.10.9000.2.1.1			Collection of objects for basic ATM PW outbound config.
cpwAtmPerfGroup	1.3.6.1.4.1.9.10.9000.2.1.2			Collection of objects counting various outbound ATM PW statistics.
cpwVcAtmCompliances	1.3.6.1.4.1.9.10.9000.2.2
cpwVcAtmModuleCompliance	1.3.6.1.4.1.9.10.9000.2.2.1			The compliance statement for agent that support PW ATM.

RFC description

Cisco implementation of RFC 5605 for managing ATM Pseudo Wire (PW) emulation over Packet Switched Networks (PSNs). Defines managed objects for configuring and monitoring ATM services over MPLS networks.

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Download CISCO-IETF-PW-ATM-MIB