// Copyright (c) 2005 DMTF. All rights reserved. // Add UmlPackagePath // qualifier values to CIM Schema. // ================================================================== // CIM_REDDropperService // ================================================================== [Version ( "2.7.0" ), UMLPackagePath ( "CIM::Network::QoS" ), Description ( "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. \n" "\n" "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." )] class CIM_REDDropperService : CIM_DropperService { [Description ( "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 { "CIM_REDDropperService.ThresholdUnits" }] uint32 MinQueueThreshold; [Description ( "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.)" ), MinValue ( 0 ), MaxValue ( 1000 ), ModelCorrespondence { "CIM_REDDropperService.ThresholdUnits" }] uint32 MaxQueueThreshold; [Description ( "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. \n" "\n" "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." ), Units ( "Per Thousand Packets" ), ModelCorrespondence { "CIM_REDDropperService.StopProbability" }] uint32 StartProbability; [Description ( "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. \n" "\n" "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." ), Units ( "Per Thousand Packets" ), MinValue ( 0 ), MaxValue ( 1000 ), ModelCorrespondence { "CIM_REDDropperService.StartProbability" }] uint32 StopProbability; [Description ( "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 { "1", "2" }, Values { "Bytes", "Packets" }] uint16 ThresholdUnits; };