Frame-Relay-技术详解

1Frame-Relay45.1.1Frame-RelayFrame-Relay8090X.25TDMX.25X.253OSI2PVC(LAPFANSIITU-TFRF(Frame-RelayForum)45.1.2Frame-RelayQ.921/Q.93164kbit/sB1664kbit/sDH(384,1472,1536kbit/s)245.1.3DLCIPVCSVCPVCDLCIPVCDLCIDLCIDLCIDLCIDLCIDLCI45.1.4LAPFT1.618LAPF(LinkAccessProcedurestoFrameModeBearerServices)ITU-TQ.922LAPF-BDH(DL)(SDU)LAPFI.430I.431ISDNB/D/HLAPFLAPF(DL-CORE)LAPF(DL-CONTROL)APFDLCI38K2LAPFDTEFCSFlags-LAPF(Flag)7Eh0111111007Eh(Address)2.3422DLCI10DLCI3(1617)4(23)DLCI01-1516-1007PVC1008-10221023LMIT1.6184CiscoLMI992ANSI97634C/REA2341()FECNBECNDEDTE()DE1(Payload)PDU16000(FCS)CRCCRC2CRC-16409645.1.5LAPFLAPFLAPFQ.922,()5LAPFFCSLAPFPDUD(LAPD)Q.922PDU-3(I)I,P/FPolling/Final6(S)I“”SS(U)MIEIE4Q.93145.1.6LAPF7LAPFD/B/HISULAPFUULAPFFCS3LAPF31)SABME3SABME(DLCI)LAPFSABME33LAPFUALAPFUALAPFDMDMLAPF2)I0IN(S)N(R)ILAPF(mod128)N(S)N(R)ILAPFI3)LAPF()()3LAPFDISCLAPFUA3IIE2IE...45.1.7LMIDTE()(LocalManagementInterfaceLMI)LMIDLCILMIPVCLMIKeepalive--------PVCPVCPVCVC--------LANLMIDTELMILMILMI8ANSIDANSIAnnexDDLCI0DTECiscoLMIANSIITU-TAADLCI0DTEAPVCCIRCiscoLMIQ933ALMILMIDLCI1023DTECiscoLMICiscoQ933ALMIPVC,SVCITUQ933ALMIQ933ALMICiscoLMICiscoLMIFRAD(framerelayaccessdevice)DLCIDLCIDLCIFRADKeepaliveCiscoLMIHDLCUI03H3Q.931(09H)(00H)75H(01110101)7DH(01111101)LMIIEIE100HIE2KeepalivePVCIEPVCDLCIANSILMIT1.617AnnexDPVCPVCPVCPVC910s(6)PVCPVCPVCANSILMIDLCI0IEIE100H01H16HPVCIE2PVCIEANSILMIANSILMILMICiscoLMICisco,Digital,NortelheStrataComQ933ALMIITUCiscoHuaweiLMIQ933ALMIQ.931HDLCUILMICiscoDLCI1023Q933AANSI-LMIDLCI0FECNBECNDE0ANSIPD08HCiscoLMI09HLMICiscoDTE3LMI3ANSI,ITUQ933A,Cisco.DLCI1023CiscoDLCI0ANSIITUiLMILMILMILMILMICiscoLMIautosense10Step16LMIDTEDLCIStep2DLCIStep3DLCIInverseARPIPIPXInverseARPStep4InverseARPDLCIDLCIPVCPVC3ACTIVE-----PVCINACTIVE-----DELETED-----LMIStep510Keepalive60sLMI3LMI45.1.8InverseARPARPFrame-RelaySNAPARPDLCIARPARPRARPRARPIPMACFRARPInverseARPARPInverseARPInverseARPARP0InverseARPInverseARPInverse-ARP,InverseARPNLPID/SNAPCiscoInvereseARPLMIInverseARPDLCICiscoInverseARPDLCIActive45.1.9FRQ.922AFRCiscoITEFRFC149011FCSFlagsFrame-RelayRFC1490ID(NLPID)CiscoProtocolTypeCiscoCiscoVC,IPQ.933SNAPRFC1490IPNLPID0xCC,CLNP0x81SNAP0x80Q.933SNAPIEEE802.3NLPID0x805SNAP3OUI2PIDOUI0x000000OUI0x0080C2PIDFCS802.3FCSPID0x0001,0x0007IPXSNAPOUI0x000000PID0x8137Q.933,IPSNAP2(Seq)4(Rsvd)(F)0111(Offset)320Frame-RelayIP12CiscoFrame-RelayFCSFlags45.2.1ciscoFrame-Relay,HSSIGSRPOSATMHDLCFrame-RelayR1(config)#interfaceserial4/2R1(config-if)#encapsulationframe-relay[ietf]CiscoCiscoietfCiscoIetfFrame-RelayVC13CiscoVCCiscoCiscoietfR1(config)#interfaceserial4/2R1(config-if)#encapsulationframe-relayR1(config-if)#frame-relaymapip172.16.1.1102broadcastietfR1(config-if)#frame-relaymapip192.168.1.1103broadcastcisconoencapsulationframe-relaynoshutR1(config)#interserial4/2R1(config-if)#noshutdownR1(config-if)#02:46:09:%LINK-3-UPDOWN:InterfaceSerial4/2,changedstatetoup02:46:10:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial4/2,changedstatetoupshowinterfaceFRAME-RELAYCiscoFRAME-RELAYIETFIETFR1#showinterfaceserial4/2Serial4/2isup,lineprotocolisupHardwareisM4TInternetaddressis172.16.1.1/24MTU1500bytes,BW2048Kbit,DLY20000usec,reliability255/255,txload1/255,rxload1/255EncapsulationFRAME-RELAY,crc16,loopbacknotsetKeepaliveset(10sec)LMIenqsent76,LMIstatrecvd78,LMIupdrecvd0,DTELMIupLMIenqrecvd0,LMIstatsent0,LMIupdsent0LMIDLCI1023LMItypeisCISCOframerelayDTEFRSVCdisabled,LAPFstatedownBroadcastqueue0/64,broadcastssent/dropped9/0,interfacebroadcasts0Lastinput00:00:09,output00:00:09,outputhangneverLastclearingofshowinterfacecounters00:14:03Inputqueue:0/75/0/0(size/max/drops/flushes);Totaloutputdrops:0Queueingstrategy:weightedfairOutputqueue:0/1000/64/0(size/maxtotal/threshold/drops)Conversations0/1/256(active/maxactive/maxtotal)14ReservedConversations0/0(allocated/maxallocated)AvailableBandwidth1536kilobits/sec5minuteinputrate0bits/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/sec79packetsinput,1163bytes,0nobufferReceived0broadcasts,0runts,0giants,0throttles0inputerrors,0CRC,0frame,0overrun,0ignored,0abort101packetsoutput,1525bytes,0underruns0outputerrors,0collisions,4interfaceresets0outputbufferfailures,0outputbuffersswappedout4carriertransitionsDCD=upDSR=upDTR=upRTS=upCTS=up45.2.2LMICisco3LMILMILMInoshutdown3LMIdebugframe-relaylmiR1#debugframe-relaylmi02:51:41:%LINK-3-UPDOWN:InterfaceSerial4/2,changedstatetoup*Jul500:20:53.535:AnnexDLMIrequest⇓Serial4/2(out):StEnq,myseq1,yourseen0,DTEup*Jul500:20:53.535:datagramstart=0x7000214,datagramsize=14*Jul500:20:53.535:FRencap=0x00010308*Jul500:20:53.535:00759501010003020100*Jul500:20:53.535:*Jul500:20:53.535:Serial4/2(out):StEnq,AnnexALMIrequest⇓myseq1,yourseen0,DTEup*Jul500:20:53.535:datagramstart=0x70000D4,datagramsize=13*Jul500:20:53.535:FRencap=0x00010308*Jul500:20:53.535:007551010053020100*Jul500:20:53.535:*Jul500:20:53.535:Serial4/2(out):StEnq,CiscoLMIrequest⇓myseq1,yourseen0,DTEup*Jul500:20:53.535:datagramstart=0x7000214,datagramsize=13*Jul500:20:53.535:FRencap=0xFCF10309*Jul500:20:53.535:007501010003020100*Jul500:20:53.535:*Ju