# Class CIM_REDDropperService
extends CIM_DropperService

REDDropperService represents the ability to drop network traffic using a Random Early Detection (RED) algorithm. The purpose of a RED algorithm is to avoid congestion (as opposed to managing congestion). Instead of waiting for the queues to fill up, and then dropping large numbers of packets, RED works by monitoring average queue depth. When the queue depth exceeds a minimum threshold, packets are randomly discarded. These discards cause TCP to slow its transmission rate for those connections that experienced the packet discards. Other connections are not affected by these discards. A RED dropper always drops packets from a single queue, which is related to the dropper as the following Service in the NextService association. The queue(s) examined by the drop algorithm are found by following the CalculationServiceForDropper association(s) to determine the dropper's DropThresholdCalculationService(s), and then following the CalculationBasedOnQueue association to find the queue being watched by each CalculationService.

### Table of Contents
Hierarchy
Direct Known Subclasses
Class Qualifiers
Class Properties
Class Methods

## Class Hierarchy

CIM_ManagedElement
|
+--CIM_ManagedSystemElement
|
+--CIM_LogicalElement
|
+--CIM_EnabledLogicalElement
|
+--CIM_Service
|
+--CIM_ConditioningService
|
+--CIM_DropperService
|
+--CIM_REDDropperService

## Direct Known Subclasses

## Class Qualifiers

Name | Data Type | Value
--- | --- | ---
Description | string | REDDropperService represents the ability to drop network traffic using a Random Early Detection (RED) algorithm. The purpose of a RED algorithm is to avoid congestion (as opposed to managing congestion). Instead of waiting for the queues to fill up, and then dropping large numbers of packets, RED works by monitoring average queue depth. When the queue depth exceeds a minimum threshold, packets are randomly discarded. These discards cause TCP to slow its transmission rate for those connections that experienced the packet discards. Other connections are not affected by these discards. A RED dropper always drops packets from a single queue, which is related to the dropper as the following Service in the NextService association. The queue(s) examined by the drop algorithm are found by following the CalculationServiceForDropper association(s) to determine the dropper's DropThresholdCalculationService(s), and then following the CalculationBasedOnQueue association to find the queue being watched by each CalculationService.
UMLPackagePath | string | CIM::Network::QoS
Version | string | 2.7.0

## Class Properties

### Local Class Properties

Name | Data Type | Default Value | Qualifiers
--- | --- | --- | ---
Name | Data Type | Value
MaxQueueThreshold | uint32 |
Description | string | This is an unsigned 32-bit integer that defines the maximum average queue length at which packets are subject to always being dropped, regardless of the dropping algorithm and probabilities being used. (See the ThresholdUnits property to determine the units of the threshold.)
MaxValue | sint64 | 1000
MinValue | sint64 | 0
ModelCorrespondence | string | CIM_REDDropperService.ThresholdUnits
MinQueueThreshold | uint32 |
Description | string | This is an unsigned 32-bit integer that defines the minimum average queue depth at which packets are subject to being dropped. (See the ThresholdUnits property to determine the units of the threshold.) The slope of the drop probability function is described by the Start/StopProbability properties.
ModelCorrespondence | string | CIM_REDDropperService.ThresholdUnits
StartProbability | uint32 |
Description | string | This is an unsigned 32-bit integer, used in conjunction with the StopDropProbability property. The start and stop probabilities define the slope of the drop probability function. This function governs the rate at which packets are subject to being dropped, as a function of the queue length. This property expresses a drop probability in drops per thousand packets. For example, the value 100 indicates a drop probability of 100 per 1000 packets, that is, 10%. Min and max values are 0 to 1000.
ModelCorrespondence | string | CIM_REDDropperService.StopProbability
PUnit | string | count / packet * 10^-3
Units | string | Per Thousand Packets
StopProbability | uint32 |
Description | string | This is an unsigned 32-bit integer, used in conjunction with the StartDropProbability property. The start and stop probabilities define the slope of the drop probability function. This function governs the rate at which packets are subject to being dropped, as a function of the queue length. This property expresses a drop probability in drops per thousand packets. For example, the value 100 indicates a drop probability of 100 per 1000 packets, that is, 10%. Min and max values are 0 to 1000.
MaxValue | sint64 | 1000
MinValue | sint64 | 0
ModelCorrespondence | string | CIM_REDDropperService.StartProbability
PUnit | string | count / packet * 10^-3
Units | string | Per Thousand Packets
ThresholdUnits | uint16 |
Description | string | ThresholdUnits is an enumerated integer that identifies the units for the Min and MaxQueueThreshold properties. The values are either bytes (1) or packets (2).
ValueMap | string | 1, 2
Values | string | Bytes, Packets

### Inherited Properties

Name | Data Type
--- | ---
AlwaysDrop | uint16
Caption | string
CommunicationStatus | uint16
CreationClassName | string
Description | string
DetailedStatus | uint16
DropFrom | uint16
DropMaintainMetric | uint16
DropperType | uint16
DropStartMetric | uint16
ElementName | string
Enabled | boolean
EnabledDefault | uint16
EnabledState | uint16
Generation | uint64
HealthState | uint16
InstallDate | datetime
InstanceID | string
LoSID | string
LoSOrgID | string
Name | string
OperatingStatus | uint16
OtherDropperType | string
OtherEnabledState | string
PrimaryOwnerContact | string
PrimaryOwnerName | string
PrimaryStatus | uint16
RequestedState | uint16
Started | boolean
StartMode | string
Status | string
SystemCreationClassName | string
SystemName | string
TimeOfLastStateChange | datetime
TransitioningToState | uint16
AvailableRequestedStates | uint16[]
OperationalStatus | uint16[]
StatusDescriptions | string[]

## Class Methods

### Inherited Class Methods

Name | Return Type
--- | ---
ChangeAffectedElementsAssignedSequence | uint32
RequestStateChange | uint32
StartService | uint32
StopService | uint32