CCIP-v2 2 pptQOS22S07L03

TrafficPolicingandShaping,ConfiguringClass-BasedShaping,Class-BasedShapingOverview,Class-basedshapingisusedtorate-limitpackets.Class-basedshapingdelaysexceedingpacketsratherthandroppingthem.Class-basedshapinghasnomarkingcapabilities.Class-basedshapingisaversionofGTSusingMQC.,TrafficShapingMethods,Class-basedshapinghastwoshapingmethods:ShapingtotheconfiguredaveragerateShapingtothepeakrateShapingtotheAverageratemeansforwardingpacketsattheconfiguredaverageratewithallowedburstinguptoBewhenthereareextratokensavailable.Thisisthemorecommonmethodused.ShapingtothePeakratemeansforwardingpacketsatthepeakrateofuptoBc+BeoftrafficateveryTc.However,trafficsentabovetheCIRmaybedroppedduringnetworkcongestion.Peakrateshapingisrecommendedwhen:NetworkhasadditionalbandwidthavailableApplicationtoleratesoccasionalpacketloss,ConfiguringClass-BasedShaping,shapeaverage|peakaverage-bit-rateBcBe,router(config-pmap-c)#,ItisrecommendedthatyouomittheBcandBetoletCiscoIOSsoftwareselecttheoptimalvaluesforthesevariables.,shapeaverage|peakpercentBcBe,router(config-pmap-c)#,Specifiesthebandwidthpercentage.Validrangeisanumberfrom1to100.ItisrecommendedthatyouomittheBcandBetoletCiscoIOSsoftwareselecttheoptimalvaluesforthesevariables.Theshape(percent)commandcannotbeconfiguredforuseinnestedpolicymapson7500routersorbelow.,CiscoIOSsoftwarecalculatedvalues:Bc=Be=8000bits,Tc=500msPeakRate=AvgRate*(1+Be/Bc)=16000*(1+8000/8000)=32000bps,Class-BasedShapingExample:AverageRate,PeakRate,class-mapShapematchprotocolcitrix!policy-mapShapeAvgclassShapeshapeaverage16000!policy-mapShapePeakclassShapeshapepeak16000!interfaceSerial0/0service-policyoutputShapeAvg!interfaceSerial0/1service-policyoutputShapePeak,Class-BasedShapingExample:Class-BasedShapingwithCBWFQ,Bandwidthstatementprovidesaminimumbandwidthguaranteeforthetrafficclass.Shapestatementprovidesamaximumtrafficrateforthetrafficclass,andexceedtrafficisqueued.,policy-mapshape-cbwfq!classcust1shapeaverage384000bandwidth256!interfaceSerial0/0service-policyoutputshape-cbwfq,Class-BasedShapingExample:Class-BasedShapingHierarchicalPolicyMaps,serviceoutshape-all,MonitoringClass-BasedShaping,routershowpolicy-mapshape-cbwfqPolicyMapshape-cbwfqClasscust1TrafficShapingAverageRateTrafficShapingCIR384000(bps)Max.BuffersLimit1000(Packets)Bandwidth256(kbps)MaxThreshold64(packets),showpolicy-mappolicy-map-name,router,Displaysinformationabouttheindicatedpolicymap,includingtheconfigurationofallclassesforaspecifiedservicepolicymap,MonitoringClass-BasedShaping(Cont.),router#showpolicy-mapinterfaces0/0Serial0/0Service-policyoutput:shape-cbwfqClass-map:cust1(match-all)0packets,0bytes5minuteofferedrate0bps,droprate0bpsMatch:access-group101TrafficShapingTarget/AverageByteSustainExcessIntervalIncrementRateLimitbits/intbits/int(ms)(bytes)384000/384000196878727872207984AdaptQueuePacketsBytesPacketsBytesShapingActiveDepthDelayedDelayedActive-00000noQueueingOutputQueue:Conversation266Bandwidth256(kbps)MaxThreshold64(packets)(pktsmatched/bytesmatched)0/0(depth/totaldrops/no-bufferdrops)0/0/0Class-map:class-default(match-any)0packets,0bytes5minuteofferedrate0bps,droprate0bpsMatch:any,Summary,Class-basedshapingdelaysexceedingpacketsratherthandroppingthemandhasnomarkingcapabilities.Class-basedshapingcanshapetotheconfiguredaveragerateortothepeakrateforpacketssatisfyingthematchcriteriaforaclass.Peak