Fore-TC-MIB

All MIBs › Fore-TC-MIB

Organization: FORE

Last Updated: 1999-11-05

Category: ATM, Textual Conventions and Registries, Vendor: Fore Systems (ATM)

Description: Fore Systems textual conventions MIB defining common data types and enumerations used throughout the Fore Systems ForeRunner MIB suite.

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What Is Fore-TC-MIB?

Fore-TC-MIB is a Fore Systems textual-conventions MIB defining shared ATM traffic-convergence-layer data types used across the ForeRunner ATM switch MIB suite, alongside actual traffic-convergence configuration and counter objects. It exposes ATM TC-layer configuration (cell scrambling, empty-cell insertion, loopback mode, framing mode) and cumulative error counters for HCS (Header Check Sequence) correctable/uncorrectable events and LCD (Loss of Cell Delineation) seconds. Its monitoring value is physical-layer/hardware health focused -- foreTcTotalLcdSeconds and the HCS error counters reveal physical ATM line/transmission-layer problems such as cell-delineation loss or header errors, serving as a hardware/link-quality health indicator for the ATM transport medium. As a textual-conventions module it underpins type definitions reused by other Fore Systems MIBs (such as Fore-Asxethernet-MIB), acting as a foundational dependency within the ForeRunner MIB suite rather than depending on external standards. It is deployed on Fore Systems ForeRunner ATM switches in legacy ATM networks, providing physical-layer diagnostics for ATM interface cards. Network engineers evaluating or troubleshooting this functionality can download the Fore-TC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Fore-TC-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

Fore Systems ForeRunner ATM switch

Monitoring Examples

An administrator would poll foreTcConfigTable/foreTcConfigEntry to check foreTcConfigFramingMode, foreTcConfigCellScrambling, and foreTcConfigLoopback settings on an ATM interface, then check foreTcTotalTable/foreTcTotalEntry for foreTcTotalLcdSeconds and foreTcTotalUncorrectableHcs -- a rising foreTcTotalLcdSeconds count combined with increasing uncorrectable HCS errors would indicate a degrading physical ATM link or a cabling/framing mismatch.

What Can Be Monitored

ATM cell scrambling/framing configuration
loopback mode
loss-of-cell-delineation seconds
correctable/uncorrectable HCS error counts

Imported Objects

From Fore-Common-MIB

asx	OBJECT-IDENTITY

From Fore-TrapLog-MIB

trapLogIndex

OBJECT-TYPE

From IF-MIB

ifIndex	OBJECT-TYPE
ifName	OBJECT-TYPE

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using foreTcTotalLcdSeconds OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch (ATM traffic convergence layer/textual conventions) 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 foreTcTotalLcdSeconds 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. The number of seconds in which the LCD (loss of cell delineation) defect occured. 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
foreTcMib	1.3.6.1.4.1.326.2.2.1.1.12			This mib implements management information for the ATM traffic convergence layer in an atm interface.
NTF foreTcLCDDetected	1.3.6.1.4.1.326.2.2.1.1.12.0.1			This trap indicates that the specified SONET port is experiencing Loss of Cell Deliniation (LCD). A LCD failure is declared when the LCD defect persists for a period of 2.5 +/- 0.5 seconds.
NTF foreTcLCDCleared	1.3.6.1.4.1.326.2.2.1.1.12.0.2			This trap indicates that the LCD failure identified by trap asxSonetAtmLCDDetected has been cleared. A LCD failure is cleared when the LCD defect is absent for 10 +/- 0.5 seconds.
foreTcConfigTable	1.3.6.1.4.1.326.2.2.1.1.12.1		not-accessible	A table of ATM Cell Convergence Layer configuration parameters.
foreTcConfigEntry	1.3.6.1.4.1.326.2.2.1.1.12.1.1		not-accessible	A table entry containing ATM Cell convergence layer configuration information for each atm interface.
INT foreTcConfigCellScrambling	1.3.6.1.4.1.326.2.2.1.1.12.1.1.1	INTEGER	read-write	This variable indicates if cell payload scrambling is enabled. If enabled, all outgoing cell payloads are scrambled via the X**43+1 generator polynomial as defined in ITU I.432.1 and all incoming cell payloads are descrambled by the same mechanism.
INT foreTcConfigEmptyCell	1.3.6.1.4.1.326.2.2.1.1.12.1.1.2	INTEGER	read-write	This variable indicates the type of ATM cells inserted into the outgoing data stream when there is no real data to send. There are two choices: idle -> All bits 0 except that CLP is set to 1 unassigned -> All bits 0 The default value is to send unassigned cells.
INT foreTcConfigLoopback	1.3.6.1.4.1.326.2.2.1.1.12.1.1.3	INTEGER	read-write	This variable indicates if cell loopback is enabled at the TC layer. There are three choices: tcNoLoop - Normal operating mode, cells are passed through. tcDiagLoop - Diagnostic mode. Transmitted cells are looped back to the ATM interface. tcPayloadLoop - Payload Loopback. Received cells are looped back to the Phy port.
INT foreTcConfigFramingMode	1.3.6.1.4.1.326.2.2.1.1.12.1.1.4	INTEGER	read-write	This variable configures and indicates the method used to encapsulate ATM cells in the data stream. There are two choices: tcFramingDirect - Direct insertion of cells into the data stream. tcFramingPlcp - Use PLCP framing. Typically this is used on T1/E1 and T3/E3 lines. Not all interfaces may support all modes. It is possible on some interfaces, for example Sonet, that this is implemented as a read-only variable set to tcFramingDirect.
I32 foreTcConfigStatus	1.3.6.1.4.1.326.2.2.1.1.12.1.1.5	Integer32	read-only	This variable indicates the ATM Status of the interface. The variable is a bit map represented as a sum, therefore it can represent multiple defects simultaneously. The sonetAtmNoDefect should be set if and only if no other flag is set. The various bit mask values are: 1 sonetAtmNoDefect 2 sonetAtmLCD Loss of Cell Delineation was detected. LCD is declared when a 'normal pointer value' is not found for eight consecutive frames. 4 sonetAtmPlcpLOF Valid PLCP frames were not detected at the interface. 8 sonetAtmPlcpYellow Plcp Yellow alarm was detected in the incoming PLCP frame stream.
foreTcTotalTable	1.3.6.1.4.1.326.2.2.1.1.12.2		not-accessible	A table of ATM Cell Convergence Layer statistics.
foreTcTotalEntry	1.3.6.1.4.1.326.2.2.1.1.12.2.1		not-accessible	A table entry containing ATM Cell convergence layer statistics for each atm interface.
C32 foreTcTotalLcdSecondsEx	1.3.6.1.4.1.326.2.2.1.1.12.2.1.1	Counter32	read-only	The number of seconds in which the LCD (loss of cell delineation) defect occured. An LCD defect is detected when an out of cell delineation state has persisted for 4ms. The defect is cleared when sync state has been maintained for 4ms.
C32 foreTcTotalCorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.2.1.2	Counter32	read-only	The number of correctable Header Check Sequence (HCS) error events that have occured since the port has been reset.
C32 foreTcTotalUncorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.2.1.3	Counter32	read-only	The number of uncorrectable Header Check Sequence (HCS) error events that have occured since the port has been reset.
C32 foreTcTotalTxCells	1.3.6.1.4.1.326.2.2.1.1.12.2.1.4	Counter32	read-only	The number of cells that were transmitted for this atm interface.
C32 foreTcTotalRxCells	1.3.6.1.4.1.326.2.2.1.1.12.2.1.5	Counter32	read-only	The number of cells that were received on this atm interface.
foreTcCurrentTable	1.3.6.1.4.1.326.2.2.1.1.12.4		not-accessible	A table of ATM Cell Convergence Layer statistics.
foreTcCurrentEntry	1.3.6.1.4.1.326.2.2.1.1.12.4.1		not-accessible	A table entry containing ATM Cell convergence layer statistics for each atm interface.
C32 foreTcCurrentErrSeconds	1.3.6.1.4.1.326.2.2.1.1.12.4.1.1	Counter32	read-only	Number of Errored Seconds
C32 foreTcCurrentSevErrSeconds	1.3.6.1.4.1.326.2.2.1.1.12.4.1.2	Counter32	read-only	Number of Severely Errored Seconds
C32 foreTcCurrentUnavailSeconds	1.3.6.1.4.1.326.2.2.1.1.12.4.1.3	Counter32	read-only	Number of Unavailable Seconds
C32 foreTcCurrentCorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.4.1.4	Counter32	read-only	The number of correctable Header Check Sequence (HCS) error events that have occured since the port has been reset.
C32 foreTcCurrentUncorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.4.1.5	Counter32	read-only	The number of uncorrectable Header Check Sequence (HCS) error events that have occured since the port has been reset.
foreTcIntervalTable	1.3.6.1.4.1.326.2.2.1.1.12.5		not-accessible	A table of ATM Cell Convergence Layer statistics.
foreTcIntervalEntry	1.3.6.1.4.1.326.2.2.1.1.12.5.1		not-accessible	A table entry containing ATM Cell convergence layer statistics for each atm interface.
I32 foreTcInterval	1.3.6.1.4.1.326.2.2.1.1.12.5.1.1	Integer32	read-only	Interval number
C32 foreTcIntervalErrSeconds	1.3.6.1.4.1.326.2.2.1.1.12.5.1.2	Counter32	read-only	Number of Errored Seconds
C32 foreTcIntervalSevErrSeconds	1.3.6.1.4.1.326.2.2.1.1.12.5.1.3	Counter32	read-only	Number of Severely Errored Seconds
C32 foreTcIntervalUnavailSeconds	1.3.6.1.4.1.326.2.2.1.1.12.5.1.4	Counter32	read-only	Number of Unavailable Seconds
C32 foreTcIntervalCorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.5.1.5	Counter32	read-only	The number of correctable Header Check Sequence (HCS) error events that have occured since the port has been reset.
C32 foreTcIntervalUncorrectableHcs	1.3.6.1.4.1.326.2.2.1.1.12.5.1.6	Counter32	read-only	The number of uncorrectable Header Check Sequence (HCS) error events that have occured since the port has been reset.

RFC description

Manages ATM traffic convergence layer configuration, statistics, and diagnostics for Fore Systems ATM interfaces.

Start monitoring Fore Systems (later Marconi) ForeRunner ATM switch (ATM traffic convergence layer/textual conventions) 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.

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