# 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
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
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 | Class Origin
--- | --- | ---
AlwaysDrop | uint16 | CIM_DropperService
Caption | string | CIM_ManagedElement
CommunicationStatus | uint16 | CIM_ManagedSystemElement
CreationClassName | string | CIM_Service
Description | string | CIM_ManagedElement
DetailedStatus | uint16 | CIM_ManagedSystemElement
DropFrom | uint16 | CIM_DropperService
DropMaintainMetric | uint16 | CIM_DropperService
DropperType | uint16 | CIM_DropperService
DropStartMetric | uint16 | CIM_DropperService
ElementName | string | CIM_ManagedElement
Enabled | boolean | CIM_ConditioningService
EnabledDefault | uint16 | CIM_EnabledLogicalElement
EnabledState | uint16 | CIM_EnabledLogicalElement
HealthState | uint16 | CIM_ManagedSystemElement
InstallDate | datetime | CIM_ManagedSystemElement
InstanceID | string | CIM_ManagedElement
Name | string | CIM_Service
OperatingStatus | uint16 | CIM_ManagedSystemElement
OtherDropperType | string | CIM_DropperService
OtherEnabledState | string | CIM_EnabledLogicalElement
PrimaryOwnerContact | string | CIM_Service
PrimaryOwnerName | string | CIM_Service
PrimaryStatus | uint16 | CIM_ManagedSystemElement
RequestedState | uint16 | CIM_EnabledLogicalElement
Started | boolean | CIM_Service
StartMode | string | CIM_Service
Status | string | CIM_ManagedSystemElement
SystemCreationClassName | string | CIM_Service
SystemName | string | CIM_Service
TimeOfLastStateChange | datetime | CIM_EnabledLogicalElement
TransitioningToState | uint16 | CIM_EnabledLogicalElement
AvailableRequestedStates | uint16[] | CIM_EnabledLogicalElement
OperationalStatus | uint16[] | CIM_ManagedSystemElement
StatusDescriptions | string[] | CIM_ManagedSystemElement

## Class Methods

### Inherited Class Methods

Name | Return Type | Class Origin
--- | --- | ---
RequestStateChange | uint32 | CIM_EnabledLogicalElement
StartService | uint32 | CIM_Service
StopService | uint32 | CIM_Service