CCIP-v2 2 pptQOS22S08L03

LinkEfficiencyMechanisms,ConfiguringLinkFragmentationandInterleaving,FragmentationOptions,CiscoIOSLFImechanismsinclude:MultilinkPPPwithinterleaving:PPPlinksFRF.12:FrameRelayPVCcarryingdatatraffic,includingVoIPoverFrameRelaytrafficFRF.11AnnexC:FrameRelayPVCcarryingVoFRtraffic,SerializationDelays,For1500-bytepackets,fragmentationisnotnecessaryaboveT1(1.5Mbps),FragmentSizeRecommendationforVoice,ConfiguringMLPwithInterleaving,Configurationsteps:EnableMLPonaninterface(usingamultilinkgroupinterface).EnableMLPinterleavingonthemultilinkinterface.Specifymaximumfragmentsizebysettingthemaximumdelayonthemultilinkinterface.,ConfiguringMLPwithInterleaving,pppmultilink,router(config-if)#,EnablesMLP,pppmultilinkinterleave,router(config-if)#,Enablesinterleavingofframeswithfragments,pppmultilinkfragmentdelaydelay,router(config-if)#,Configuresmaximumfragmentdelayinms.Theroutercalculatesthemaximumfragmentsizefromtheinterfacebandwidthandthemaximumfragmentdelay.Fragmentsize=interfacebandwidth*maximumfragmentdelayDefaultmaximumfragmentdelayis30ms.,MLPwithInterleavingExample,interfaceMultilink1ipaddress172.22.130.1255.255.255.252pppmultilinkpppmultilinkgroup1pppmultilinkfragmentdelay10-所有大包（传送时间超过10MS）都切，每片都有一个切片头，用于重组（即便是数据包没有切片也有这个头）pppmultilinkinterleavebandwidth128service-policyoutputllq-policy!interfaceSerial0/0noipaddressencapsulationppppppmultilinkpppmultilinkgroup1,MonitoringMLPInterleaving,showinterfacesmultilinkinterface-number,router,DisplaysMLPstatisticsincludingthenumberofinterleavedframes,routershowinterfacesmultilink1Multilink1isup,lineprotocolisupHardwareismultilinkgroupinterfaceInternetaddressis172.22.130.1/30MTU1500bytes,BW64Kbit,DLY100000usec,reliability255/255,txload27/255,rxload1/255EncapsulationPPP,loopbacknotsetKeepaliveset(10sec)DTRispulsedfor2secondsonresetLCPOpen,multilinkOpenOpen:IPCPLastinput00:00:03,outputnever,outputhangneverLastclearingofshowinterfacecounters6d00hInputqueue:0/75/0/0(size/max/drops/flushes);Totaloutputdrops:0Queueingstrategy:weightedfairOutputqueue:0/1000/64/0/2441(size/maxtotal/threshold/drops/interleaves)Conversations0/7/16(active/maxactive/maxtotal)ReservedConversations0/0(allocated/maxallocated)5minuteinputrate0bits/sec,0packets/sec5minuteoutputrate7000bits/sec,6packets/sec,FRF.12FrameRelayFragmentation,FRF.12specifiesfragmentationofFrameRelaydataframes:FrameRelaydataframesthatexceedthespecifiedfragmentationsizearefragmented.Smallertime-sensitivepacketscanbeinterleaved.ThisistherecommendedFrameRelayfragmentationmethodtobeusedwithVoIPoverFrameRelay.FragmentsVoIPoverFrameRelaypacketsifthefragmentsizeissettoavaluesmallerthanthevoicepacketsize.FRF.12requiresFRTSorDTS.,ConfiguringFRF.12FrameRelayFragmentation,map-classframe-relaymap-class-name,router(config)#,SpecifiesamapclasstodefineQoSvaluesforavirtualcircuit,frame-relayfragmentfragment-size,router(config-map-class)#,EnablesfragmentationofFrameRelayframesforaFrameRelaymapclassSetsthemaximumfragmentsizeinbytes,frame-relayclassname,router(config-if)#|(config-subif)#|(config-fr-dlci)#,Associatesamapclasswithaninterface,subinterface,orDLCI,FRF.12FrameRelayFragmentationExample,interfaceserial0/0encapsulationframe-relayframe-relaytraffic-shaping!interfaceserial0/0.1point-to-pointframe-relayinterface-dlci100classFRF12!map-classframe-relayFRF12frame-relayfragment80二层包大小，如果切片，加上切片头，如果不切，就没有切片头!FRTSparametersframe-relaycir64000frame-relaybc2600frame-relayfair-queue,FRF.12FrameRelayFragmentationExample,interfaceserial0/0encapsulationframe-relayframe-relaytraffic-shaping!interfaceserial0/0.1point-to-pointframe-relayinterface-dlci100classFRF12!map-classframe-relayFRF12frame-relayfragment80!FRTSparametersframe-relaycir64000frame-relaybc640frame-relaymincir64000收到BECN后降低发送速度，降低到的最低值，缺省是1/2service-policyoutputllq-policy一般来说套一个IP5的class，放到LLQ里面,MonitoringFRF.12FrameRelayFragmentation,showframe-relayfragmentinterfaceinterfaceDLCI,router,routershowframe-relayfragmentinterfacedlcifrag-typefrag-sizein-fragout-fragdropped-fragSerial0/0.1100end-to-end80000,DisplaysinformationabouttheFrameRelayfragmentation,Summary,CiscoLFIoptionsareMultilinkPPPwithinterleaving,FRF.12,andFRF.11AnnexC.Serializationdelayisafunctionofthelinkspeedandpacketsize.Toensurelowdelayandjitterforvoicepacketsonslowlinks,therecommendedstandardgoalforserializationdelayistonotexceed10to15ms.ThepppmultilinkcommandenablesMLPonaPPPinterface.Thepppmultilinkinterleavecommandenablesinterleavingoffragmentswithinthemultilinkconnection.Thepppmultilinkfragment-delaycommandspecifiesthemaximumdesiredfragmentdelayfortheinterleavedmultilinkconnection.TheshowinterfacemultilinkcommandoutputincludesMLPLFIstatisticsinformationandindicateswhetherMLPinterleavingisenabledontheinterface.,Summary(Cont.),FRF.12specifiesfragmentationofFrameRelaydataframeswhentheyexceedaspecifiedsizeorwhentherearesmallertime-sensitivepacketsthatcanbeinterleaved,andwillfragmentVoIPsiffragmentsizeissettoasmallervaluethantheVoIPsize.Theframe-