CENTILLION-ATMMON-MIB

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Category: ATM, Vendor: Nortel

Description: Monitors ATM cell traffic statistics and connection performance on Nortel Centillion ATM switch platforms.

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What Is CENTILLION-ATMMON-MIB?

CENTILLION-ATMMON-MIB is a Nortel-specific MIB for the Centillion family of ATM (Asynchronous Transfer Mode) switches, providing detailed cell-level and port-level traffic monitoring for ATM interfaces. It exposes per-card, per-port statistics such as cell counts, HEC (header error control) errors, SUNI FIFO overruns, and DMA drop counts, along with PVC (permanent virtual circuit) status and ELAN (emulated LAN) monitoring objects. This makes it directly useful for monitoring hardware and link-level health: rising bad-HEC-cell or FIFO-overrun counts point to a failing ATM interface card or degraded physical layer, while signal-detection and PVC status objects reveal whether a circuit is up. The module builds on base ATM interface conventions and is used alongside other Centillion MIBs (bridge group, VLAN, LES/BUS) that together manage the same switch. It is deployed in legacy Nortel Centillion ATM/LAN-emulation switch fabrics found in older enterprise campus backbones. Network engineers evaluating or troubleshooting this functionality can download the CENTILLION-ATMMON-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CENTILLION-ATMMON-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

Nortel Centillion ATM switch

Monitoring Examples

An administrator would poll atmPortStatTable/atmPortStatEntry, keyed by atmStatCardId and atmStatPortId, to track counters like atmRxGoodCell, atmTxGoodCell, atmRxBadHecCell, and atmSuniFifoOverrun for each ATM port. A sustained rise in atmRxBadHecCell or atmSuniFifoOverrun on a specific port typically indicates a failing transceiver or a physical-layer fiber problem, while atmSigDetected going false flags a lost carrier signal. atmPvcStatusMonitor and atmElanMonitor would be checked to confirm that configured PVCs and emulated LANs remain operational.

What Can Be Monitored

ATM port cell counters (good/bad cells)
HEC error counts
SUNI FIFO overruns
DMA drop counts
PVC status
signal detection status

Imported Objects

From CENTILLION-ROOT-MIB

CardId
MacAddress
PortId
atmMonitor	OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
IpAddress

From RFC1213-MIB

ifIndex

OIDs

OID symbolic	OID numeric	Type	Access	Description
atmPortMonitor	1.3.6.1.4.1.930.2.2.2.1
atmPortStatTable	1.3.6.1.4.1.930.2.2.2.1.1		not-accessible	ATM Port Statistics
atmPortStatEntry	1.3.6.1.4.1.930.2.2.2.1.1.1		not-accessible	ATM Port Statistics. Each entry is indexed by two fields: The card number and the port number.
CAR atmStatCardId	1.3.6.1.4.1.930.2.2.2.1.1.1.1	CardId	read-only	This field is the card index
POR atmStatPortId	1.3.6.1.4.1.930.2.2.2.1.1.1.2	PortId	read-only	This field is the port index
INT atmSigDetected	1.3.6.1.4.1.930.2.2.2.1.1.1.3	INTEGER	read-only	This bit field indicates if the port receives signal from the remote ATM port. 1= signal present, 2= no signal.
CTR atmRxBadHecCell	1.3.6.1.4.1.930.2.2.2.1.1.1.4	Counter	read-only	The number of cells received that has a bad ATM cell header (HEC). The error is usually due to a physical layer problem. For example, when the fiber is first connected to the system or a clock mismatch.
CTR atmRxDmaDropCell	1.3.6.1.4.1.930.2.2.2.1.1.1.5	Counter	read-only	The number of cells received but is discarded by the ATM header validation checking. The error is usually due to a incorrectly configured VPI/VCI or other configuration error.
CTR atmRxGoodCell	1.3.6.1.4.1.930.2.2.2.1.1.1.6	Counter	read-only	The number of cells received that is valid.
CTR atmTxDmaDropCell	1.3.6.1.4.1.930.2.2.2.1.1.1.7	Counter	read-only	The number of outgoing cells dropped due to congestions.
CTR atmTxGoodCell	1.3.6.1.4.1.930.2.2.2.1.1.1.8	Counter	read-only	The number of cells transmitted.
CTR atmSuniFifoOverrun	1.3.6.1.4.1.930.2.2.2.1.1.1.9	Counter	read-only	The number of times that the SUNI FIFO overrun status bit has been read in the true state.
atmElanMonitor	1.3.6.1.4.1.930.2.2.2.2
atmElanPvcStatisticTable	1.3.6.1.4.1.930.2.2.2.2.1		not-accessible	Tmp ATM Elan PVC statistics
atmElanPvcStatisticEntry	1.3.6.1.4.1.930.2.2.2.2.1.1		not-accessible	ATM Elan PVC statistics. The Elan ID is used as the index of the object.
INT atmElanId	1.3.6.1.4.1.930.2.2.2.2.1.1.1	INTEGER	read-only	The Elan index.
INT atmElanPvcInUcastPkt	1.3.6.1.4.1.930.2.2.2.2.1.1.2	INTEGER	read-only	The number of unicast packet that is received from this Elan PVC.
INT atmElanPvcInMcastPkt	1.3.6.1.4.1.930.2.2.2.2.1.1.3	INTEGER	read-only	The number of multicast packet that is received from this Elan PVC.
INT atmElanPvcOutUcastPkt	1.3.6.1.4.1.930.2.2.2.2.1.1.4	INTEGER	read-only	The number of unicast packet that is transmitted from this Elan PVC.
INT atmElanPvcOutMcastPkt	1.3.6.1.4.1.930.2.2.2.2.1.1.5	INTEGER	read-only	The number of unicast packet that is transmitted from this Elan PVC.
atmPvcStatusMonitor	1.3.6.1.4.1.930.2.2.2.3
atmPvcStatusTable	1.3.6.1.4.1.930.2.2.2.3.1		not-accessible	Tmp ATM InterSwitch PVC status
atmPvcStatusEntry	1.3.6.1.4.1.930.2.2.2.3.1.1		not-accessible	ATM PVC status. The PVC circuit ID is used as the index of the object.
INT atmPvcCktId	1.3.6.1.4.1.930.2.2.2.3.1.1.1	INTEGER	read-only	This field is the index of the circuit.
INT atmPvcElanId	1.3.6.1.4.1.930.2.2.2.3.1.1.2	INTEGER	read-only	This field is the index of the elan this circuit belongs to.
INT atmPvcRemoteSwitchInfoValid	1.3.6.1.4.1.930.2.2.2.3.1.1.3	INTEGER	read-only	This field is based on the aging timer of a remote switch. If the local switch has not received any packets from the remote switch for a period of time, then it is declared as non-valid. 1 = non-valid 2 = valid (normal state of operation).
MAC atmPvcRemoteSwitchMacAddress	1.3.6.1.4.1.930.2.2.2.3.1.1.4	MacAddress	read-only	This field lists the remote switch's MAC address. If the atmInterSwitchPvcRemoteSwitchInfoValid object is 1, then this field contains the valid info. Otherwise, this field contains the last learned info.
INT atmPvcRemoteSwitchPvcStatus	1.3.6.1.4.1.930.2.2.2.3.1.1.5	INTEGER	read-only	This field is set if the remote switch receives packets from this switch. If atmInterSwitchPvcRemoteSwitchInfoValid objeect is 1, then this field contains the valid info. Otherwise, this field contains the last learned info.
INT atmPvcSTPState	1.3.6.1.4.1.930.2.2.2.3.1.1.6	INTEGER	read-only	This field indicates the STP port state of the circuit.
INT atmPvcRemoteElanId	1.3.6.1.4.1.930.2.2.2.3.1.1.7	INTEGER	read-only	This field indicates the elan ID of the circuit.
IP atmPvcRemoteMcpIpAddress	1.3.6.1.4.1.930.2.2.2.3.1.1.8	IpAddress	read-only	This is the remote mcp ip address.
atmSigMonitor	1.3.6.1.4.1.930.2.2.2.4
INT cnCurPtptConns	1.3.6.1.4.1.930.2.2.2.4.1	INTEGER	read-only	This counter counts the number of current point-to-point calls of the switch.
INT cnCurPtmptConns	1.3.6.1.4.1.930.2.2.2.4.2	INTEGER	read-only	This counter counts the number of current point-to-multipoint calls of the switch.
INT cnCurActiveConns	1.3.6.1.4.1.930.2.2.2.4.3	INTEGER	read-only	This counter counts the number of current active calls of the switch.
cnCurPortConnsTable	1.3.6.1.4.1.930.2.2.2.4.4		not-accessible	This table contains the point-to-point, point-to-multipoint and active calls per port for all the atm ports in the switch.
cnCurPortConnsEntry	1.3.6.1.4.1.930.2.2.2.4.4.1		not-accessible	This entry contains the point-to-point, point-to-multipoint and active calls per port.
INT cnCurPortConnsPtptConns	1.3.6.1.4.1.930.2.2.2.4.4.1.1	INTEGER	read-only	This entry counts the number of current point-to-point calls per port.
INT cnCurPortConnsPtmptConns	1.3.6.1.4.1.930.2.2.2.4.4.1.2	INTEGER	read-only	This entry counts the number of current point-to-multipoint calls per port.
INT cnCurPortConnsActiveConns	1.3.6.1.4.1.930.2.2.2.4.4.1.3	INTEGER	read-only	This entry counts the number of current active calls per port.
atmCardMonitor	1.3.6.1.4.1.930.2.2.2.5
atmCardOperTable	1.3.6.1.4.1.930.2.2.2.5.1		not-accessible	ATM Card Operational values
atmCardOperEntry	1.3.6.1.4.1.930.2.2.2.5.1.1		not-accessible	ATM Card Operational values. Each entry is indexed by card number
CAR atmCardOperCardId	1.3.6.1.4.1.930.2.2.2.5.1.1.1	CardId	read-only	This field is the card index
INT atmCardOperExtClockSource	1.3.6.1.4.1.930.2.2.2.5.1.1.2	INTEGER	read-only	This field indicates the operational external clock source. The following value is read-only: 0 = Local Oscillator, 1..N = ATM port id for external clock source. This object only applies to ATM MDA modules with SM, MM, or UTP media types.
atmStatusEnqMonitor	1.3.6.1.4.1.930.2.2.2.6
INT cnStsEnqPTPCalls	1.3.6.1.4.1.930.2.2.2.6.1	INTEGER	read-only	The number of current point-to-point calls in the status enquiry queue of the switch.
INT cnStsEnqActiveParties	1.3.6.1.4.1.930.2.2.2.6.2	INTEGER	read-only	The number of current active parties in the status enquiry queue of the switch. (This includes point- to-multi-point calls).
INT cnStsEnqSent	1.3.6.1.4.1.930.2.2.2.6.3	INTEGER	read-only	The total number of status enquiry requests sent.
INT cnStsEnqCfmsRecvd	1.3.6.1.4.1.930.2.2.2.6.4	INTEGER	read-only	The number of current status messages (in response to status enquiry) received.
INT cnStsEnqRetried	1.3.6.1.4.1.930.2.2.2.6.5	INTEGER	read-only	The total number of status enquiry commands retried.
INT cnStsEnqTimeOuts	1.3.6.1.4.1.930.2.2.2.6.6	INTEGER	read-only	The total number of status enquiry commands timed out i.e The number of calls for which status (in response to status enquiry) was not received.
INT cnStsEnqQueueSize	1.3.6.1.4.1.930.2.2.2.6.7	INTEGER	read-only	The size of the status enquiry queue.
INT cnStsEnqCallsCleared	1.3.6.1.4.1.930.2.2.2.6.8	INTEGER	read-only	The number of calls cleared by status enquiry.

RFC description

Bay Networks Centillion ATM port, ELAN, and PVC monitoring for asynchronous transfer mode.

Start monitoring Nortel/Bay Networks Centillion ATM/LAN switches (legacy) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CENTILLION-ATMMON-MIB

What Is CENTILLION-ATMMON-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description