# Threshold Configuration

Configuration > Output Scheduling > Threshold Configuration

Threshold configuration consists of configuring the drop algorithms. The two types of drop algorithms are TailDrop and Weighted Random Early Detect (WRED).

TailDrop entails dropping incoming packets if the queue type can be configured as a percentage.

WRED is a mechanism of dropping packets fairly during congestion so that adaptive applications can react to congestion. Configuring WRED is done by specifying minimum and maximum threshold.

To view the definition for a particular MIB variable, click the appropriate link from the following list:

- Queue Type (caqQueueThreshQueueType)

- Queue Number (caqQueueThreshQueueIndex)

- Threshold Value (caqQueueThreshThresholdIndex)

- Drop Algorithm (caqQueueThreshDropAlgorithm)

- Drop Threshold (caqQueueThreshDropThreshold)

- Min WRED Threshold (caqQueueThreshMinWredThreshold)

- Max WRED Threshold (caqQueueThreshMaxWredThreshold)

The following list specifies buttons in this dialog box, as well as their function:

- Click OK to continue.

- Click Apply to save the changes in the dialog box.

- Click Cancel to close the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access the online help.

Queue Type (caqQueueThreshQueueType)

Indicates the queue type.

Queue Number (caqQueueThreshQueueIndex)

Indicates the queue number. This number must not be larger than the queue count defined by caqQueueThreshQueueType.

Threshold Value (caqQueueThreshThresholdIndex)

Indicates the threshold number. This number must not be larger than the threshold count defined by caqQueueThreshQueueType.

Drop Algorithm (caqQueueThreshDropAlgorithm)

Indicates the drop algorithm used by this queue and threshold.tailDrop(1) value indicates that tailDrop is used; wred(2) value indicates that WRED is used.

Drop Threshold (caqQueueThreshDropThreshold)

Specifies the drop threshold parameter for a queue and threshold of an interface queue type when the drop algorithm used is TailDrop. When the number of packets in the buffer exceeds the value of this object, incoming packets in the buffer are dropped. The value is a percentage of the full buffer.

This object is instantiated only if the value of caqQueueThreshDropAlgorithm is tailDrop(1).

Min WRED Threshold (caqQueueThreshMinWredThreshold)

Specifies the min WRED threshold parameter of a threshold number for the specific port type when WRED drop algorithm is used.

WRED (Weighted Random Early Detect) is a mechanism which drops packets fairly during congestion so that adaptive applications can react to the congestion. This object specifies a percentage of the buffer size.

This object is instantiated only if the value of caqQueueThreshDropAlgorithm is wred(2).

Max WRED Threshold (caqQueueThreshMaxWredThreshold)

Specifies the max WRED threshold parameter of a threshold number for the specific port type when WRED drop algorithm is used.

This object is instantiated only if the value of caqQueueThreshDropAlgorithm is wred(2).