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Policy-Map Commands

XSR CLI Reference Guide 12-95

Examples

ThefollowingexampleenablesWREDwithaminimumthresholdforDSCPaf21of24and

maximumthresholdof40.Thedroppingprobabilityis1/4th.AllotherDSCPshavedefaultvalues.

XSR(config)#policy-map wred

XSR(config-pmap<wred>)#class a

XSR(config-pmap-c<a>)#random-detect dscp-based

XSR(config-pmap-c<a>)#random-detect dscp af21 24 40 4

ThefollowingexamplesetsWREDItsetsDSCP33WREDparametersto10,20,10andchangesthe

settingforallotherDSCPvaluesfrominitialtodefault5,10,20 .

XSR(config)#policy-map wred

XSR(config-pmap<wred>)#class a

XSR(config-pmap-c<a>)#random-detect dscp-based

XSR(config-pmap-c<a>)#random-detect dscp 33 10 20 10

XSR(config-pmap-c<a>)#random-detect default 5 10 20

random-detect exponential-weighting-constant

ThiscommandconfigurestheWeightedRandomEarlyDetect(WRED)exponentialweightfactor

fortheaveragequeuesizecalculation.Theweightconstantisexpressedasapowerof2.

WREDusestheexponentialweightingfactortocalculateaveragequeuesize.Tosimplify

computingaveragequeuesize,theweightconstantisallowedto

beapowerof2.Choosingthe

rightvalueofthisconstantisimportantforproperWREDoperation.Thedefaultvalueisbasedon

availabledataandshouldbechangedonlyifyourapplicationsbenefitfromadifferentvalue.

Syntax

random-detect exponential-weighting-constant value

Cs1 32 40 1/10

Cs2 28 40 1/10

Cs3 24 40 1/10

Cs4 32 40 1/10

Cs5 28 40 1/10

Cs6 24 40 1/10

Cs7 32 40 1/10

Ef 28 40 1/10

Initialparametersforall

otherDSCP values

24 40 1/10

Table 12-1 DSCP Threshold/Max Drop Probability Parameters (continued)

DSCP Min Threshold Max Threshold Max Drop Probability

value

Exponentrangingfrom1to16.

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