TIARA-QOS-MIB

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Organization: Tiara Networks Inc.

Last Updated: 2000-06-10

Category: QoS

Description: Manages Tiara Networks WAN router QoS policy classification and queuing configuration.

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What Is TIARA-QOS-MIB?

TIARA-QOS-MIB is Tiara Networks' enterprise MIB for configuring and monitoring Quality of Service policy on WAN interfaces, specifically Random Early Detection (RED) congestion-avoidance queuing. It exposes RED configuration objects (thresholds, weighting factor, enable flag) per queue alongside RED statistics objects reporting loaned bandwidth counts and average/peak queue size. Its monitoring value is centered on traffic performance and congestion behavior: an operator can watch queue size and loaned-bandwidth statistics to detect when a WAN interface is approaching congestion or actively dropping/marking packets under RED. It is a self-contained enterprise MIB for Tiara's QoS subsystem without strong dependency on other standard MIBs. It is typically deployed by WAN operators tuning congestion-avoidance behavior on Tiara Networks routers carrying mixed traffic classes. Engineers can download the TIARA-QOS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TIARA-QOS-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

Tiara Networks WAN router

Monitoring Examples

An administrator would configure redTxMaxThreshold, redTxMinThreshold, and redTxWqBiasFactor in tiaraRedConfigTable to tune when RED begins marking/dropping packets on a transmit queue, then poll tiaraRedStatTable for redTxAvgQueueSize and redTxMaxAvgQueueSize to see how close the queue runs to those thresholds. A rising redTxLoanedCount or redTxMaxLoanedCount alongside a growing redTxAvgQueueSize would indicate the interface is under sustained congestion and borrowing bandwidth beyond its normal allocation, signaling a need to re-tune QoS policy or add capacity.

What Can Be Monitored

RED queue congestion thresholds
RED enable status per queue
average and maximum queue size
loaned bandwidth count

Imported Objects

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

From TIARA-IP-MIB

tiaraIpIfIndex

OBJECT-TYPE

From TIARA-NETWORKS-SMI

tiaraMgmt

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using redTxLoanedCount OID:

Select a Tiara Networks WAN router (RED congestion-avoidance queue/statistics status) 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 redTxLoanedCount 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. This is the instantaneous queue size measured by RED for a given WAN interface. 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
tiaraQosMib	1.3.6.1.4.1.3174.2.17			QoS MIB for configuring Quality of Service parameters on a WAN interface.
tiaraRedConfigTable	1.3.6.1.4.1.3174.2.17.1		not-accessible	This table consists of all parameters that are needed to configure RED on a WAN interface.
tiaraRedConfigEntry	1.3.6.1.4.1.3174.2.17.1.1		not-accessible	Describes an entry in the RED configuration table.
I32 redTxMaxThreshold	1.3.6.1.4.1.3174.2.17.1.1.1	Integer32	read-write	This is the upper limit for the average queue size for a given WAN interface. If the average queue size exceeds this value, RED drops all packets that are destined for that WAN interface. When a WAN interface is created, the maximum threshold is initialized to three times the minimum threshold. Setting maximum threshold to greater than two times minimum threshold is recommended for proper operation.
I32 redTxMinThreshold	1.3.6.1.4.1.3174.2.17.1.1.2	Integer32	read-write	This is the threshold at which RED begins dropping packets. When the average queue size for a WAN interface increases above the minimum threshold, RED drops packets with a certain probability that increases linearly as the average queue size increases from the minimum to the maximum threshold. Below the minimum threshold, RED allows all packets. When a WAN interface is created, the minimum threshold is initialized to a value that is dependent on the bandwidth of the interface. Setting the minimum threshold to less than this value may cause unnecessary packet drops at close to 100% utilization.
I32 redTxWqBiasFactor	1.3.6.1.4.1.3174.2.17.1.1.3	Integer32	read-write	This is the exponential weighting/bias factor used to calculate the moving average of the queue size. A higher value smooths out the peaks and troughs in the instantaneous queue size and, hence, better accomodates bursts. A lower value is more responsive to changes in queue size. It is important to select the optimum value. Using the default of 5 is recommended.
T/F redTxEnable	1.3.6.1.4.1.3174.2.17.1.1.4	TruthValue	read-write	This is used to enable or disable RED on a WAN interface. RED is enabled by default.
tiaraRedStatTable	1.3.6.1.4.1.3174.2.17.2		not-accessible	This table gives RED statistics for a given WAN interface.
tiaraRedStatEntry	1.3.6.1.4.1.3174.2.17.2.1		not-accessible	Describes an entry in the RED statistics table.
C32 redTxLoanedCountEx	1.3.6.1.4.1.3174.2.17.2.1.1	Counter32	read-only	This is the instantaneous queue size measured by RED for a given WAN interface.
C32 redTxMaxLoanedCount	1.3.6.1.4.1.3174.2.17.2.1.2	Counter32	read-only	This is the maximum instantaneous queue size seen on a given WAN interface. In other words, it is the maximum number of packets that had been queued for transmission on the WAN interface.
C32 redTxAvgQueueSize	1.3.6.1.4.1.3174.2.17.2.1.3	Counter32	read-only	This is the current value of the average queue size on a given WAN interface and is a measure of congestion on that interface. RED attempts to keep this value between the minimum and maximum thresholds.
C32 redTxMaxAvgQueueSize	1.3.6.1.4.1.3174.2.17.2.1.4	Counter32	read-only	This is the maximum value that the average queue size on a given WAN interface has reached.
C32 redTxDropRate	1.3.6.1.4.1.3174.2.17.2.1.5	Counter32	read-only	This is the rate at which RED drops packets when the average queue size is between the minimum and maximum thresholds. A value of N indicates that one out of N packets will be dropped.
C32 redTxMinThresholdSuccess	1.3.6.1.4.1.3174.2.17.2.1.6	Counter32	read-only	This is the number of packets allowed by RED while the average queue size (for a given WAN interface) is below the minimum threshold.
C32 redTxMaxThresholdFailure	1.3.6.1.4.1.3174.2.17.2.1.7	Counter32	read-only	This is the number of packets dropped by RED when the average queue size exceeds the maximum threshold.
C32 redTxMinMaxRangeSuccess	1.3.6.1.4.1.3174.2.17.2.1.8	Counter32	read-only	This is the number of packets allowed by RED while the average queue size is between the minimum and maximum thresholds.
C32 redTxMinMaxRangeFailure	1.3.6.1.4.1.3174.2.17.2.1.9	Counter32	read-only	This is the number of packets dropped by RED while the average queue size is between the minimum and maximum thresholds.
C32 redTxControlSuccess	1.3.6.1.4.1.3174.2.17.2.1.10	Counter32	read-only	This is the number of control packets (for e.g., routing updates) that need to be dropped, but are allowed by RED. Routing updates are detected by RED and are not dropped.
tiaraCbqConfigTable	1.3.6.1.4.1.3174.2.17.3		not-accessible	This table consists of all the parameters required to configure a CBQ traffic class on an interface.
tiaraCbqConfigEntry	1.3.6.1.4.1.3174.2.17.3.1		not-accessible	Describes an entry in the CBQ config table.
INT cbqClassIndex	1.3.6.1.4.1.3174.2.17.3.1.1	INTEGER	read-only
STR cbqClassName	1.3.6.1.4.1.3174.2.17.3.1.2	DisplayString	read-only
STR cbqClassParentName	1.3.6.1.4.1.3174.2.17.3.1.3	DisplayString	read-only
INT cbqClassBandwidth	1.3.6.1.4.1.3174.2.17.3.1.4	INTEGER	read-only
INT cbqClassBurstTolerance	1.3.6.1.4.1.3174.2.17.3.1.5	INTEGER	read-only
INT cbqClassKeyType	1.3.6.1.4.1.3174.2.17.3.1.6	INTEGER	read-only
T/F cbqClassIsDefault	1.3.6.1.4.1.3174.2.17.3.1.7	TruthValue	read-only
INT cbqClassAverageBandwidth	1.3.6.1.4.1.3174.2.17.3.1.8	INTEGER	read-only
tiaraCbqClassKeyTable	1.3.6.1.4.1.3174.2.17.4		not-accessible
tiaraCbqClassKeyTableEntry	1.3.6.1.4.1.3174.2.17.4.1		not-accessible
INT cbqClassKeyIndex	1.3.6.1.4.1.3174.2.17.4.1.1	INTEGER	read-only
STR cbqKeyClassName	1.3.6.1.4.1.3174.2.17.4.1.2	DisplayString	read-only
INT cbqClassKeyVlanId	1.3.6.1.4.1.3174.2.17.4.1.3	INTEGER	read-only
IP cbqClassKeyIpAddress	1.3.6.1.4.1.3174.2.17.4.1.4	IpAddress	read-only
IP cbqClassKeyIpNetMask	1.3.6.1.4.1.3174.2.17.4.1.5	IpAddress	read-only
INT cbqClassKeyPort	1.3.6.1.4.1.3174.2.17.4.1.6	INTEGER	read-only
INT cbqClassKeyProtocolType	1.3.6.1.4.1.3174.2.17.4.1.7	INTEGER	read-only
tiaraCbqStatsTable	1.3.6.1.4.1.3174.2.17.5		not-accessible	This table gives CBQ's traffic class statistics for a given TIARA interface.
tiaraCbqStatsEntry	1.3.6.1.4.1.3174.2.17.5.1		not-accessible	Describes an entry in the CBQ's statistics table.
STR cbqStatsClassName	1.3.6.1.4.1.3174.2.17.5.1.1	DisplayString	read-only
C32 cbqClassPacketsForwarded	1.3.6.1.4.1.3174.2.17.5.1.2	Counter32	read-only
C32 cbqClassBytesForwarded	1.3.6.1.4.1.3174.2.17.5.1.3	Counter32	read-only
C32 cbqClassPacketsDropped	1.3.6.1.4.1.3174.2.17.5.1.4	Counter32	read-only
C32 cbqClassBytesDropped	1.3.6.1.4.1.3174.2.17.5.1.5	Counter32	read-only
C32 cbqClassBurstExceedCount	1.3.6.1.4.1.3174.2.17.5.1.6	Counter32	read-only

RFC description

Tiara Networks vendor-private MIB; provides QoS (Quality of Service) configuration and monitoring objects for Tiara network devices.

Start monitoring Tiara Networks WAN router (RED congestion-avoidance queue/statistics 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 TIARA-QOS-MIB