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version 1.1.2.1, 2012/01/24 13:50:20
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version 1.1.2.2, 2012/02/15 17:46:37
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// Copyright (c) 2005 DMTF. All rights reserved. |
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// <change cr="ArchCR00066.004" type="add">Add UmlPackagePath |
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// qualifier values to CIM Schema.</change> |
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// ================================================================== |
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// CIM_REDDropperService |
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// ================================================================== |
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[Version ( "2.7.0" ), |
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UMLPackagePath ( "CIM::Network::QoS" ), |
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Description ( |
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"REDDropperService represents the ability to drop network " |
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"traffic using a Random Early Detection (RED) algorithm. The " |
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"purpose of a RED algorithm is to avoid congestion (as opposed " |
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"to managing congestion). Instead of waiting for the queues to " |
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"fill up, and then dropping large numbers of packets, RED works " |
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"by monitoring average queue depth. When the queue depth " |
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"exceeds a minimum threshold, packets are randomly discarded. " |
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"These discards cause TCP to slow its transmission rate for " |
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"those connections that experienced the packet discards. Other " |
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"connections are not affected by these discards. \n" |
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"\n" |
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"A RED dropper always drops packets from a single queue, which " |
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"is related to the dropper as the following Service in the " |
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"NextService association. The queue(s) examined by the drop " |
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"algorithm are found by following the " |
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"CalculationServiceForDropper association(s) to determine the " |
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"dropper\'s DropThresholdCalculationService(s), and then " |
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"following the CalculationBasedOnQueue association to find the " |
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"queue being watched by each CalculationService." )] |
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class CIM_REDDropperService : CIM_DropperService { |
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[Description ( |
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"This is an unsigned 32-bit integer that defines the " |
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"minimum average queue depth at which packets are subject " |
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"to being dropped. (See the ThresholdUnits property to " |
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"determine the units of the threshold.) The slope of the " |
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"drop probability function is described by the " |
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"Start/StopProbability properties." ), |
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ModelCorrespondence { "CIM_REDDropperService.ThresholdUnits" }] |
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uint32 MinQueueThreshold; |
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|
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[Description ( |
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"This is an unsigned 32-bit integer that defines the " |
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"maximum average queue length at which packets are " |
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"subject to always being dropped, regardless of the " |
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"dropping algorithm and probabilities being used. (See " |
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"the ThresholdUnits property to determine the units of " |
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"the threshold.)" ), |
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MinValue ( 0 ), |
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MaxValue ( 1000 ), |
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ModelCorrespondence { "CIM_REDDropperService.ThresholdUnits" }] |
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uint32 MaxQueueThreshold; |
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|
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[Description ( |
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"This is an unsigned 32-bit integer, used in conjunction " |
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"with the StopDropProbability property. The start and " |
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"stop probabilities define the slope of the drop " |
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"probability function. This function governs the rate at " |
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"which packets are subject to being dropped, as a " |
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"function of the queue length. \n" |
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"\n" |
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"This property expresses a drop probability in drops per " |
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"thousand packets. For example, the value 100 indicates a " |
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"drop probability of 100 per 1000 packets, that is, 10%. " |
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"Min and max values are 0 to 1000." ), |
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Units ( "Per Thousand Packets" ), |
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ModelCorrespondence { "CIM_REDDropperService.StopProbability" }] |
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uint32 StartProbability; |
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|
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[Description ( |
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"This is an unsigned 32-bit integer, used in conjunction " |
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"with the StartDropProbability property. The start and " |
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"stop probabilities define the slope of the drop " |
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"probability function. This function governs the rate at " |
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"which packets are subject to being dropped, as a " |
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"function of the queue length. \n" |
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"\n" |
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"This property expresses a drop probability in drops per " |
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"thousand packets. For example, the value 100 indicates a " |
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"drop probability of 100 per 1000 packets, that is, 10%. " |
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"Min and max values are 0 to 1000." ), |
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Units ( "Per Thousand Packets" ), |
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MinValue ( 0 ), |
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MaxValue ( 1000 ), |
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ModelCorrespondence { "CIM_REDDropperService.StartProbability" }] |
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uint32 StopProbability; |
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|
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[Description ( |
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"ThresholdUnits is an enumerated integer that identifies " |
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"the units for the Min and MaxQueueThreshold properties. " |
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"The values are either bytes (1) or packets (2)." ), |
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ValueMap { "1", "2" }, |
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Values { "Bytes", "Packets" }] |
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uint16 ThresholdUnits; |
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}; |
Return to
CIM_REDDropperService.mof
CVS log
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