TIME-AGGREGATE-MIB

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Organization: Cyber Solutions Inc. NetMan Working Group

Last Updated: 2006-04-27

Category: MPLS and Traffic Engineering

Description: Defines managed objects for aggregating multiple time-based samples of the same MIB object instance, reducing SNMP bandwidth.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring TIME-AGGREGATE-MIB with a free 30-day trial of IPNetwork Monitor.

What Is TIME-AGGREGATE-MIB?

TIME-AGGREGATE-MIB is an IETF experimental-track MIB (RFC 4498) that defines managed objects for time-based aggregation of repeated samples of any other MIB object instance, reducing the SNMP polling overhead of collecting time-series data. Its control table, tAggrCtlTable, lets a manager define a Time-Based Aggregate MO (TAgMO) by pointing tAggrCtlMOInstance at any target OBJECT IDENTIFIER, specifying a sampling tAggrCtlInterval (in microseconds) and tAggrCtlSamples count, and optionally applying a tAggrCtlCompressionAlgorithm (none or deflate per RFC 1951) before the agent returns the accumulated samples as an Opaque-encoded TimeAggrMOValue or CompressedTimeAggrMOValue, with per-sample error status available via TAggrMOErrorStatus. This makes it useful for efficient monitoring of rapidly-changing counters or gauges — retrieving many time-spaced samples of a single object in one PDU instead of many separate polls — which is valuable for high-resolution performance trending without proportionally increasing SNMP traffic. It depends on RMON-MIB (OwnerString), SNMP-FRAMEWORK-MIB (SnmpAdminString), and SNMPv2-TC (RowStatus, StorageType) for its supporting types, and implementers can consult the TIME-AGGREGATE-MIB RFC directly for the full encoding rules.

IPNetwork Monitor allows you to monitor SNMP objects defined in TIME-AGGREGATE-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 (RFC 4498), not tied to a specific manufacturer

Monitoring Examples

An operator creates a tAggrCtlTable row pointing tAggrCtlMOInstance at an interface's ifInOctets, with a short tAggrCtlInterval and enough tAggrCtlSamples to cover a polling gap; retrieving the resulting TimeAggrMOValue in one GET and finding gaps flagged by TAggrMOErrorStatus would indicate the sampled counter was temporarily unreachable during part of the aggregation window.

What Can Be Monitored

time-aggregated sample control table entries
sampling interval and sample count configuration
compression algorithm selection
aggregated (and optionally compressed) sample value payloads
per-sample error status for failed samples

Imported Objects

From RMON-MIB

OwnerString

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
Opaque
experimental

From SNMPv2-TC

RowStatus
StorageType
TEXTUAL-CONVENTION

OIDs

OID symbolic	OID numeric	Type	Access	Description
tAggrMIB	1.3.6.1.3.124			The MIB for servicing Time-Based aggregate objects. Copyright (C) The Internet Society (2006). This version of this MIB module is part of RFC 4498; see the RFC itself for full legal notices.
tAggrCtlTable	1.3.6.1.3.124.1		not-accessible	The Time-Based aggregation control table. It controls the aggregation of the samples of MO instances. There will be a row for each TAgMO.
tAggrCtlEntry	1.3.6.1.3.124.1.1		not-accessible	A row of the control table that defines one Time-Based aggregate MO (TAgMO).
STR tAggrCtlEntryID	1.3.6.1.3.124.1.1.1	SnmpAdminString	not-accessible	A locally unique, administratively assigned name for this aggregated MO. It is used as an index to uniquely identify this row in the table.
OID tAggrCtlMOInstance	1.3.6.1.3.124.1.1.2	OBJECT IDENTIFIER	read-create	The sampled values of this MO instance will be aggregated by the TAgMO.
STR tAggrCtlAgMODescr	1.3.6.1.3.124.1.1.3	SnmpAdminString	read-create	A textual description of the aggregate object.
I32 tAggrCtlInterval	1.3.6.1.3.124.1.1.4	Integer32	read-create	The interval, in microseconds, at which the MO instance pointed at by tAggrInstance will be sampled for Time-Based aggregation.
I32 tAggrCtlSamples	1.3.6.1.3.124.1.1.5	Integer32	read-create	The number of times at which the MO instance referred to by tAggrInstance will be sampled for Time-Based aggregation.
INT tAggrCtlCompressionAlgorithm	1.3.6.1.3.124.1.1.6	INTEGER	read-create	The compression algorithm that will be used by the agent to compress the value of the TAgMO. The deflate algorithm and corresponding data format specification is described in RFC 1951. It is compatible with the widely used gzip utility.
STR tAggrCtlEntryOwner	1.3.6.1.3.124.1.1.7	OwnerString	read-create	A textual description of the entity that created this entry.
STO tAggrCtlEntryStorageType	1.3.6.1.3.124.1.1.8	StorageType	read-create	This object defines whether the parameters defined in this row are kept in volatile storage and lost upon reboot or backed up by non-volatile (permanent) storage. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row.
ROW tAggrCtlEntryStatus	1.3.6.1.3.124.1.1.9	RowStatus	read-create	The row status variable, used according to row installation and removal conventions. Objects in a row can be modified only when the value of this object in the corresponding conceptual row is not 'active'. Thus, to modify one or more of the objects in this conceptual row, a. change the row status to 'notInService', b. change the values of the row, and c. change the row status to 'active'. The tAggrCtlEntryStatus may be changed to 'active' iff all the MOs in the conceptual row have been assigned valid values.
tAggrDataTable	1.3.6.1.3.124.2		not-accessible	This is the data table. Each row of this table contains information about a TAgMO indexed by tAggrCtlEntryID. tAggrCtlEntryID is the key to the table. It is used to identify instances of the TAgMO that are present in the table.
tAggrDataEntry	1.3.6.1.3.124.2.1		not-accessible	Entry containing information pertaining to a TAgMO.
TIM tAggrDataRecord	1.3.6.1.3.124.2.1.1	TimeAggrMOValue	read-only	The snapshot value of the TAgMO.
COM tAggrDataRecordCompressed	1.3.6.1.3.124.2.1.2	CompressedTimeAggrMOValue	read-only	The compressed value of the TAgMO. The compression algorithm will depend on the tAggrCtlCompressionAlgorithm given in the corresponding tAggrCtlEntry. If the value of the corresponding tAggrCtlCompressionAlgorithm is (1) 'none', then the value of all instances of this object will be a string of zero length. Note that the access privileges to this object will be governed by the access privileges of the corresponding MO instance. Thus, an entity attempting to access an instance of this MO MUST have access rights to the instance object pointed at by tAggrCtlMOInstance and this MO instance.
TAG tAggrDataErrorRecord	1.3.6.1.3.124.2.1.3	TAggrMOErrorStatus	read-only	The error status corresponding to the MO instance samples aggregated in tAggrDataRecord (and tAggrDataRecordCompressed).
tAggrConformance	1.3.6.1.3.124.3
tAggrGroups	1.3.6.1.3.124.3.1
tAggrMibBasicGroup	1.3.6.1.3.124.3.1.1			A collection of objects for Time-Based aggregation of MOs.
tAggrCompliances	1.3.6.1.3.124.3.2
tAggrMibCompliance	1.3.6.1.3.124.3.2.1			The compliance statement for SNMP entities that implement the TIME-AGGREGATE-MIB.

RFC description

Vendor-private MIB for time-series data aggregation and statistics collection in network monitoring.

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Download TIME-AGGREGATE-MIB

What Is TIME-AGGREGATE-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description