TCAv1-MIB

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Category: Vendor-Specific Device Management

Description: Manages TCA v1 device configuration, threshold settings, and operational state.

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What Is TCAv1-MIB?

TCAv1-MIB is a Bellcore (Telcordia) standards-oriented MIB that defines a generic Threshold Crossing Alert (TCA) mechanism for telecom network elements, allowing any interface performance counter to be watched against a configured threshold. Its tcaTable lets an operator associate a target object (tcaObject/tcaObjectDesc) on a given interface with a threshold value, a sample type/interval, and a running count of threshold crossings, with tcaTrapEnabler controlling whether an SNMP trap fires on crossing. Its monitoring purpose is generic performance/fault threshold monitoring: it wraps around whatever performance counters an interface exposes and reports how many times, and when, a configured threshold was exceeded, functioning as a fault/alerting layer rather than exposing its own hardware sensors. It is explicitly designed to be layered on top of other interface/performance MIBs, referencing arbitrary performance counters by OID, rather than defining new raw counters itself. It is deployed in telecom transport network elements (e.g., SONET/SDH, DS1/DS3 equipment) needing standardized threshold-crossing alerting per Bellcore/Telcordia requirements. Engineers can download the TCAv1-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TCAv1-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

vendor-neutral, standards-based MIB (Bellcore/Telcordia TCA)
telecom transport network elements (SONET/SDH, DS1/DS3 equipment)

Monitoring Examples

An administrator would configure a tcaTable/tcaEntry indexed by tcaIfIndex and tcaIndex, setting tcaObject to point at a specific performance counter (such as an error-second counter on that interface) and tcaThreshold to the acceptable crossing limit. Polling tcaCounts and tcaTimeStamp reveals how many times and when that threshold was exceeded during the tcaSampleType interval, and if tcaTrapEnabler is set, an SNMP trap would fire automatically the moment the monitored counter crosses tcaThreshold, flagging a degrading transport link before it fails outright.

What Can Be Monitored

threshold-crossing count per monitored object
configured threshold value
sample type/interval
trap-on-crossing enablement
last crossing timestamp

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
TimeTicks
enterprises

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
bellcore	1.3.6.1.4.1.148
requirements	1.3.6.1.4.1.148.1
tcaMIB	1.3.6.1.4.1.148.1.5
tcaObjects	1.3.6.1.4.1.148.1.5.1
tcaTable	1.3.6.1.4.1.148.1.5.1.1		not-accessible	The Threshold Crossing Alert table.
tcaEntry	1.3.6.1.4.1.148.1.5.1.1.1		not-accessible	An entry in the Threshold Crossing Alert table.
INT tcaIfIndex	1.3.6.1.4.1.148.1.5.1.1.1.1	INTEGER	read-only	The value of this object is equal to MIB II's ifIndex value for this interface sublayer (ifEntry).
INT tcaIndex	1.3.6.1.4.1.148.1.5.1.1.1.2	INTEGER	read-only	The value of this object is used as one of the indices for this table. It is a unique identifier for this row in the table for this interface (ifIndex). The value of this object can be from 1 to N, where N is the number of potential TCAs for this interface sublayer (ifEntry).
OID tcaObject	1.3.6.1.4.1.148.1.5.1.1.1.3	OBJECT IDENTIFIER	read-only	The value of this object is the OBJECT IDENTIFIER of the counter object being thresholded. The counter objects being thresholded are defined in other MIB Modules.
STR tcaObjectDesc	1.3.6.1.4.1.148.1.5.1.1.1.4	DisplayString	read-only	The value of this object is a description of the counter object being thresholded. For example, DS1 Coding Violations.
INT tcaThreshold	1.3.6.1.4.1.148.1.5.1.1.1.5	INTEGER	read-only	The value of this object is the threshold value of the counter object being thresholded.
INT tcaSampleType	1.3.6.1.4.1.148.1.5.1.1.1.6	INTEGER	read-only	The value of this object is the sample type of the counter object being thresholded from the perspective of the CNM or XA-OM customer. All counters are thresholded over a 15-minute interval. However, over this 15-minute interval the threshold value may be an absolute value (e.g., used for interval counters) or a delta value (e.g., used for continuous counters). The intervals are measured locally at the agent, and are not visible to the manager. At the agent's local interval boundary, all threshold crossing measurements are reset to zero. (A counter value may cross the predefined threshold and a TCA is sent only once within a 15-minute interval.)
CTR tcaCounts	1.3.6.1.4.1.148.1.5.1.1.1.7	Counter	read-only	The value of this object is the number of times the threshold was crossed for this counter object, since sysUpTime was initialized or restarted. This counter is a continuous counter. It should be noted that as this object has a SYNTAX of Counter, that it does not have a defined initial value. However, it is recommended that this object be initialized to zero.
TIK tcaTimeStamp	1.3.6.1.4.1.148.1.5.1.1.1.8	TimeTicks	read-only	The value of this object is equal to the value of MIB-II's sysUpTime object at which last (latest) threshold was crossed for this counter object. The value of this object is set to zero at (re)initialization.
INT tcaTrapEnabler	1.3.6.1.4.1.148.1.5.1.1.1.9	INTEGER	read-write	Indicates whether an fyiTrap should be generated for this threshold crossing count (tcaObject). The physical layer counters' and gauges' (e.g., DS1, DS3, SONET, and PLCP) TCAs should have a default value of disabled(2). The SMDS service violations and higher layer protocol violations counters' TCAs should have a default value of enabled(1). A fyiTrap, when generated, shall have the following varBind list: tcaObject, tcaObjectDesc, tcaThreshold, and tcaTimeStamp.
tcaConformance	1.3.6.1.4.1.148.1.5.2
tcaGroups	1.3.6.1.4.1.148.1.5.2.1
tcaGroup	1.3.6.1.4.1.148.1.5.2.1.1
tcaCompliances	1.3.6.1.4.1.148.1.5.2.2
tcaCompliance	1.3.6.1.4.1.148.1.5.2.2.1

RFC description

Threshold Crossing Alert table for monitoring interface statistics and triggering alarms based on thresholds.

Start monitoring vendor-neutral, standards-based MIB (Bellcore/Telcordia TCA), telecom transport network elements (threshold-crossing alert status) 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 TCAv1-MIB

What Is TCAv1-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description