ART-MIB

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Organization: NetScout Systems, Inc.

Last Updated: 1999-10-05

Category: Network Monitoring (RMON)

Description: Application response time measurement for SLA monitoring and end-user experience management.

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What Is ART-MIB?

ART-MIB (Application Response Time MIB) is a vendor-associated but broadly adopted MIB - originally from NetScout/Frontier Software, visible in its 'frontier'/'netscout2' object roots - used for measuring application response time to support SLA monitoring and end-user experience management. It exposes a protocol directory table identifying monitored application protocols and a control table that lets an operator configure and run response-time measurement instances, including data source, measurement duration, and time-remaining for a given test. Rather than raw hardware sensors, this MIB monitors software/service performance status: it captures multiple response-time samples (artControlRspTime1/2/3) for a monitored transaction, letting administrators detect application-layer slowdowns that hardware-level metrics like CPU or interface counters would not directly reveal. It depends on an IETF PROTOCOL-DIRECTORY-MIB-style structure (evident from protocolDir2Table) for identifying which protocols are being measured. It is deployed on network probes, RMON2-capable monitoring appliances, or NetScout-style performance-monitoring systems embedded in enterprise or service-provider networks. Engineers can download the ART-MIB file directly to load it into their MIB browser.

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

NetScout/Frontier-style RMON2 performance-monitoring probe or appliance

Monitoring Examples

A performance engineer can poll artControlTable / artControlEntry, setting artControlDataSource and artControlDuration to define a measurement run, then track artControlTimeRemaining to see when results will be ready. The resulting artControlRspTime1, artControlRspTime2, and artControlRspTime3 values (successive response-time samples) reveal whether an application's response time is trending upward, indicating a developing performance problem, while protocolDir2Table cross-references which protocol (via protocolDir2ArtConfig) is bound to a given ART control instance.

What Can Be Monitored

response time samples
measurement duration/time remaining
data source configuration
monitored protocol identity
application response-time trend

Imported Objects

From RMON-MIB

OwnerString

From RMON2-MIB

DataSource
protocolDirEntry	OBJECT-TYPE
protocolDirLocalIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE
enterprises

From SNMPv2-TC

RowStatus
TimeStamp

How to Use in IPNetwork Monitor

Example using artControlDroppedFrames OID:

Select an RMON2 performance-monitoring probes/appliance (NetScout/Frontier-style) 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 artControlDroppedFrames 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 total number of frames which were received by the probe and therefore not accounted for in the *StatsDropEvents, but for which the probe chose not to count for this entry for whatever reason. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
art	1.3.6.1.4.1.141.2.1.5			The MIB module for Application Response Time measurement.
I32 artAvgRspTime	1.3.6.1.4.1.141.2.1.5.3.1.3	Integer32	read-only	The average response time, in milliseconds, observed during the report interval. Specification of milliseconds as the time units does not require the probe to maintain one-millisecond time granularity. Response time is measured as the number of milliseconds, as observed by the probe, between the final packet of an application-layer request PDU from client to server and the first packet of a response PDU from server client. This object is the arithmetical mean of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation. Additional semantics of 'response time' may depend on the application being monitored.
OCT artClientAddress	1.3.6.1.4.1.141.2.1.5.3.1.2	OCTET STRING	not-accessible	The address of the client. This is identified as an octet string with specific semantics and length as identified by the protocolDirLocalIndex component of the index.
C64 artClientHCOctets	1.3.6.1.4.1.141.2.1.5.3.1.16	Counter64	read-only	The high-capacity version of artClientOctets.
C32 artClientOctets	1.3.6.1.4.1.141.2.1.5.3.1.14	Counter32	read-only	The total number of octets observed in client requests during the report interval. If the application-layer PDU has been fragmented into multiple packets, all octets in each of the packets are included in this count.
C32 artClientOverflowOctets	1.3.6.1.4.1.141.2.1.5.3.1.15	Counter32	read-only	The number of times the associated artClientOctets counter has overflowed.
artConformance	1.3.6.1.4.1.141.2.1.5.4
DAT artControlDataSource	1.3.6.1.4.1.141.2.1.5.2.1.2	DataSource	read-create	The source of data for application response-time collection, i.e., the data source (typically, a probe interface) for which ART statistics are to be collected and reports generated. This object shall not be modified if the associated artControlStatus is equal to active(1).
C32 artControlDroppedFramesEx	1.3.6.1.4.1.141.2.1.5.2.1.16	Counter32	read-only	The total number of frames which were received by the probe and therefore not accounted for in the *StatsDropEvents, but for which the probe chose not to count for this entry for whatever reason. Most often, this event occurs when the probe is out of some resources and decides to shed load from this collection. This count does not include packets that were not counted because they had MAC-layer errors. Note that, unlike the dropEvents counter, this number is the exact number of frames dropped.
I32 artControlDuration	1.3.6.1.4.1.141.2.1.5.2.1.4	Integer32	read-only	This object is used to latch the value of artTimeRemaining for automatic collection restart at the end of a collection interval.
artControlEntry	1.3.6.1.4.1.141.2.1.5.2.1		not-accessible	A conceptual row in the artControlTable. Creation of a row enables ART collection and report generation for the corresponding data source. The artControlRspTime{1..6} objects are used to categorize the request-response pairs observed during an ART sample interval. The NMS is responsible to ensure that: artControlRspTime1 <= artControlRspTime2 artControlRspTime2 <= artControlRspTime3 artControlRspTime3 <= artControlRspTime4 artControlRspTime4 <= artControlRspTime5 artControlRspTime5 <= artControlRspTime6 and that: artControlRspTime6 <= artControlRspTimeout If these relationships do not hold, the probe rejects any attempt to set the artControlStatus object to active(1). Suggested default values for the time ranges are: artControlRspTime1 25 milliseconds artControlRspTime2 50 milliseconds artControlRspTime3 100 milliseconds artControlRspTime4 200 milliseconds artControlRspTime5 400 milliseconds artControlRspTime6 800 milliseconds The table is implicitly indexed by data source, using the DataSource identifier corresponding to the data source.
I32 artControlGeneratedRpts	1.3.6.1.4.1.141.2.1.5.2.1.15	Integer32	read-only	The number of report sets that have been generated by this entry. The NMS may use this value to poll for the availability of a new report set. It may also sample this value before and after a sweep of the artTable or artSummaryTable in order to verify that a new report set was not generated during the sweep.
I32 artControlGrantedSize	1.3.6.1.4.1.141.2.1.5.2.1.14	Integer32	read-only	The maximum number of report rows in the artTable granted by the probe for the associated data source. The value of this object may be less than the requested size.
I32 artControlIndex	1.3.6.1.4.1.141.2.1.5.2.1.1	Integer32	not-accessible	A unique index for this artControlEntry.
STR artControlOwner	1.3.6.1.4.1.141.2.1.5.2.1.17	OwnerString	read-create	The entity that configured this entry and is therefore using the resources assigned to it.
I32 artControlRequestedSize	1.3.6.1.4.1.141.2.1.5.2.1.13	Integer32	read-create	The maximum number of report rows to be generated in the artTable for the associated data source. If set to -1, the maximum number of report rows shall be determined by the probe based on available resources.
TIM artControlRptStartTime	1.3.6.1.4.1.141.2.1.5.2.1.12	TimeStamp	read-only	The time at which collection of the currently available reports was started.
I32 artControlRspTime1	1.3.6.1.4.1.141.2.1.5.2.1.5	Integer32	read-create	The first of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTime2	1.3.6.1.4.1.141.2.1.5.2.1.6	Integer32	read-create	The second of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTime3	1.3.6.1.4.1.141.2.1.5.2.1.7	Integer32	read-create	The third of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTime4	1.3.6.1.4.1.141.2.1.5.2.1.8	Integer32	read-create	The fourth of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTime5	1.3.6.1.4.1.141.2.1.5.2.1.9	Integer32	read-create	The fifth of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTime6	1.3.6.1.4.1.141.2.1.5.2.1.10	Integer32	read-create	The sixth of six time values used to categorize the response times observed during the report interval. This object may not be changed while artControlStatus is set to active(1).
I32 artControlRspTimeout	1.3.6.1.4.1.141.2.1.5.2.1.11	Integer32	read-create	The maximum interval that the probe will wait for a server response to a client request. Requests older than this value are abandoned, and counted as artTimeouts in the artTable and as artSummaryTimeouts in the artSummaryTable. This object may not be changed while artControlStatus is set to active(1).
ROW artControlStatus	1.3.6.1.4.1.141.2.1.5.2.1.18	RowStatus	read-create	The status of this control table entry. An entry must not exist in the active state unless all objects in the entry have an appropriate value. If this object is not equal to active(1), all associated entries in the artTable and artSummaryTable shall be deleted.
artControlTable	1.3.6.1.4.1.141.2.1.5.2		not-accessible	This table lists the data sources (typically, probe interfaces) for which application response time collection is enabled, and additionally controls the generation of ART reports in the artTable and artSummaryTable.
I32 artControlTimeRemaining	1.3.6.1.4.1.141.2.1.5.2.1.3	Integer32	read-create	The number of seconds remaining in the current report interval. When this value reaches zero, the probe deletes any existing reports for the associated data source, creates a new report corresponding to the just-expired interval, copies the current value of artControlDuration to this object, and starts a new collection interval. The value of this object is latched in artControlDuration whenever it is written to using SNMP, allowing automatic restart of collection using the same duration. If this object is overwritten while the associated artStatus is equal to active(1), the current collection for the associated data source is abandoned, and a new collection started using the new interval. Setting this value to 0 abandons current collection and disables report generation for the associated data source. (This is not recommended -- better to delete the row.) The probe should delay the initial countdown of this object in order to align report intervals to 12:00 AM UTC.
artEntry	1.3.6.1.4.1.141.2.1.5.3.1		not-accessible	A conceptual row in the artTable. Each row corresponds to an application response time report for an individual {data source, application-protocol, client, server} quadruple. Rows are created and deleted by the probe, and all objects are read-only to the NMS. Rows are indexed (in effect) by data source, application protocol identifier, server address, and client address. Note that only the client and server address index components correspond to objects in the table.
artGroup	1.3.6.1.4.1.141.2.1.5.4.2.1			This group adds application response time measurement to RMON-2.
I32 artMaxRspTime	1.3.6.1.4.1.141.2.1.5.3.1.5	Integer32	read-only	The maximum response time, in milliseconds, observed during the report interval. This object is the maximum value of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation. The probe should use wait for for artControlRspTimeout milliseconds before abandoning the wait for a server response.
artMIBCompliance	1.3.6.1.4.1.141.2.1.5.4.1.1			Describes the requirements for conformance to the ART MIB.
artMIBCompliances	1.3.6.1.4.1.141.2.1.5.4.1
artMIBGroups	1.3.6.1.4.1.141.2.1.5.4.2
I32 artMinRspTime	1.3.6.1.4.1.141.2.1.5.3.1.4	Integer32	read-only	The minimum response time, in milliseconds, observed during the report interval. This object is the minimum value of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation.
C32 artRetries	1.3.6.1.4.1.141.2.1.5.3.1.20	Counter32	read-only	This total number of application-layer client retries observed during the report interval.
C32 artRsps1	1.3.6.1.4.1.141.2.1.5.3.1.7	Counter32	read-only	The first of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required less than artRspTime1 milliseconds.
C32 artRsps2	1.3.6.1.4.1.141.2.1.5.3.1.8	Counter32	read-only	The second of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime1 milliseconds but less than artRspTime2 milliseconds.
C32 artRsps3	1.3.6.1.4.1.141.2.1.5.3.1.9	Counter32	read-only	The third of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime2 milliseconds but less than artRspTime3 milliseconds.
C32 artRsps4	1.3.6.1.4.1.141.2.1.5.3.1.10	Counter32	read-only	The fourth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime3 milliseconds but less than artRspTime4 milliseconds.
C32 artRsps5	1.3.6.1.4.1.141.2.1.5.3.1.11	Counter32	read-only	The fifth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime4 milliseconds but less than artRspTime5 milliseconds.
C32 artRsps6	1.3.6.1.4.1.141.2.1.5.3.1.12	Counter32	read-only	The sixth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime5 milliseconds but less than artRspTime6 milliseconds.
C32 artRsps7	1.3.6.1.4.1.141.2.1.5.3.1.13	Counter32	read-only	The seventh of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artRspTime6
OCT artServerAddress	1.3.6.1.4.1.141.2.1.5.3.1.1	OCTET STRING	not-accessible	The address of the server. This is identified as an octet string with specific semantics and length as identified by the protocolDirLocalIndex component of the index.
C64 artServerHCOctets	1.3.6.1.4.1.141.2.1.5.3.1.19	Counter64	read-only	The high-capacity version of artServerOctets.
C32 artServerOctets	1.3.6.1.4.1.141.2.1.5.3.1.17	Counter32	read-only	The total number of octets in server responses during the report interval. If the application-layer PDU has been fragmented into multiple packets, all octets in each of the packets are included in this count.
C32 artServerOverflowOctets	1.3.6.1.4.1.141.2.1.5.3.1.18	Counter32	read-only	The number of times the associated artServerOctets counter has overflowed.
I32 artSummaryAvgRspTime	1.3.6.1.4.1.141.2.1.5.5.1.3	Integer32	read-only	The average response time, in milliseconds, observed during the report interval. Specification of milliseconds as the time units does not require the probe to maintain one-millisecond time granularity. Response time is measured as the number of milliseconds, as observed by the probe, between the final packet of an application-layer request PDU from client to server and the first packet of a response PDU from server client. This object is the arithmetical mean of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation. Additional semantics of 'response time' may depend on the application being monitored.
C64 artSummaryClientHCOctets	1.3.6.1.4.1.141.2.1.5.5.1.16	Counter64	read-only	The high-capacity version of artSummaryClientOctets.
C32 artSummaryClientOctets	1.3.6.1.4.1.141.2.1.5.5.1.14	Counter32	read-only	The total number of octets observed in client requests during the report interval. If the application-layer PDU has been fragmented into multiple packets, all octets in each of the packets are included in this count.
C32 artSummaryClientOverflowOctets	1.3.6.1.4.1.141.2.1.5.5.1.15	Counter32	read-only	The number of times the associated artClientOctets counter has overflowed.
I32 artSummaryClients	1.3.6.1.4.1.141.2.1.5.5.1.2	Integer32	read-only	The number of clients of this server for which requests were successfully paired with server responses during the report interval.
artSummaryEntry	1.3.6.1.4.1.141.2.1.5.5.1		not-accessible	A conceptual row in the artSummaryTable. Each row corresponds to an application response time report for an individual {data source, application-protocol, server} triple. Values in the each row correspond to the summary of response time information of all clients of the associated server, whereas the rows in the artTable contain detailed information for {data source, application- protocol, client, server} quadruples. Rows are created and deleted by the probe, and all objects are read-only to the NMS. Rows are indexed (in effect) by data source, application protocol identifier, and server address. Note that only the server address index component corresponds to an object in the table.
I32 artSummaryMaxRspTime	1.3.6.1.4.1.141.2.1.5.5.1.5	Integer32	read-only	The maximum response time, in milliseconds, observed during the report interval. This object is the maximum value of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation. The probe should use a reasonable timeout period before abandoning the wait for a server response.
I32 artSummaryMinRspTime	1.3.6.1.4.1.141.2.1.5.5.1.4	Integer32	read-only	The minimum response time, in milliseconds, observed during the report interval. This object is the minimum value of the individual response times observed during the interval. Only server responses that the probe has successfully paired with client requests are included in the calculation.
C32 artSummaryRetries	1.3.6.1.4.1.141.2.1.5.5.1.20	Counter32	read-only	This total number of application-layer client retries observed during the report interval.
C32 artSummaryRsps1	1.3.6.1.4.1.141.2.1.5.5.1.7	Counter32	read-only	The first of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required less than artControlRspTime1 milliseconds.
C32 artSummaryRsps2	1.3.6.1.4.1.141.2.1.5.5.1.8	Counter32	read-only	The second of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime1 milliseconds but less than artControlRspTime2 milliseconds.
C32 artSummaryRsps3	1.3.6.1.4.1.141.2.1.5.5.1.9	Counter32	read-only	The third of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime2 milliseconds but less than artControlRspTime3 milliseconds.
C32 artSummaryRsps4	1.3.6.1.4.1.141.2.1.5.5.1.10	Counter32	read-only	The fourth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime3 milliseconds but less than artControlRspTime4 milliseconds.
C32 artSummaryRsps5	1.3.6.1.4.1.141.2.1.5.5.1.11	Counter32	read-only	The fifth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime4 milliseconds but less than artControlRspTime5 milliseconds.
C32 artSummaryRsps6	1.3.6.1.4.1.141.2.1.5.5.1.12	Counter32	read-only	The sixth of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime5 milliseconds but less than artControlRspTime6 milliseconds.
C32 artSummaryRsps7	1.3.6.1.4.1.141.2.1.5.5.1.13	Counter32	read-only	The seventh of seven counters used to categorize the response times observed during the report interval. This object is a count of responses that required at least artControlRspTime6
OCT artSummaryServerAddress	1.3.6.1.4.1.141.2.1.5.5.1.1	OCTET STRING	not-accessible	The address of the server. This is identified as an octet string with specific semantics and length as identified by the protocolDirLocalIndex component of the index.
C64 artSummaryServerHCOctets	1.3.6.1.4.1.141.2.1.5.5.1.19	Counter64	read-only	The high-capacity version of artSummaryServerOctets.
C32 artSummaryServerOctets	1.3.6.1.4.1.141.2.1.5.5.1.17	Counter32	read-only	The total number of octets in server responses during the report interval. If the application-layer PDU has been fragmented into multiple packets, all octets in each of the packets are included in this count.
C32 artSummaryServerOverflowOctets	1.3.6.1.4.1.141.2.1.5.5.1.18	Counter32	read-only	The number of times the associated artSummaryServerOctets counter has overflowed.
artSummaryTable	1.3.6.1.4.1.141.2.1.5.5		not-accessible	This table provides sets of application response time summary reports. Each row of the table corresponds to a report. Existing reports are deleted by the probe at the expiration of each sampling period, and replaced with new reports for the just-ended period. Generation of reports is controlled using the objects in the artControlTable. Note that this table is shared by all probe data sources, although reports are generated independently for each data source.
C32 artSummaryTimeouts	1.3.6.1.4.1.141.2.1.5.5.1.21	Counter32	read-only	The number of times the probe has timed-out a client request while waiting for a server response during the report interval. Timeouts may occur due to server congestion or failure, network congestion or failure, or probe congestion.
C32 artSummaryTotalResponses	1.3.6.1.4.1.141.2.1.5.5.1.6	Counter32	read-only	The total number of client requests that have been successfully paired with a corresponding server response during the report interval. Requests that have been timed-out by the probe are not counted by this object.
artTable	1.3.6.1.4.1.141.2.1.5.3		not-accessible	This table provides sets of application response time reports. Each row of the table corresponds to a report. Existing reports are deleted by the probe at the expiration of each sampling period, and replaced with new reports for the just-ended period. Generation of reports is controlled using the objects in the artControlTable. The maximum number of report rows in this table is the sum of each of the artControlGrantedSize object values in the artControlTable. Note that this table is shared by all data sources, although reports are generated independently for each data source.
C32 artTimeouts	1.3.6.1.4.1.141.2.1.5.3.1.21	Counter32	read-only	The number of times the probe has timed-out a client request while waiting for a server response during the report interval. Timeouts may occur due to server congestion or failure, network congestion or failure, or probe congestion.
C32 artTotalResponses	1.3.6.1.4.1.141.2.1.5.3.1.6	Counter32	read-only	The total number of client requests that have been successfully paired with a corresponding server response during the report interval. Requests that have been timed-out by the probe are not counted by this object.
frontier	1.3.6.1.4.1.141
mibdoc2	1.3.6.1.4.1.141.2
netscout2	1.3.6.1.4.1.141.2.1
INT protocolDir2ArtConfig	1.3.6.1.4.1.141.2.1.5.1.1.1	INTEGER	read-create	This object describes and configures the probe's support for application response time monitoring for the protocol. When the probe creates entries in this table for all protocols that it understands, it will set the entry to notSupported(1) if it doesn't have the capability to track application response time for this protocol. If the value of this object is supportedOff(2), the probe supports tracking of application response time, but is configured to not track response time for any control entries or data sources. If the value of this object is supportedOn(3), the probe supports tracking of application response time for this protocol, and will allow creation of entries in the artControlTable for the associated protocol. Whenever this value changes from supportedOn(3) to supportedOff(2), the probe shall delete all related entries in the artTable and artSummaryTable.
protocolDir2Entry	1.3.6.1.4.1.141.2.1.5.1.1		not-accessible	Contains the ART augmentations to RMON-2.
protocolDir2Table	1.3.6.1.4.1.141.2.1.5.1		not-accessible	Contains the ART augmentations to RMON-2.

RFC description

Extends RMON-2 monitoring with Application Response Time measurement capabilities by augmenting the protocol directory table.

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Download ART-MIB