ccna視頻教程第11章ospf-lchy

1、CiscoCertifiedNetworkmsn:CiscoCertifiedNetworkmsn:第十一章-標(biāo)度OSPF的優(yōu)對網(wǎng)絡(luò)發(fā)生OSPF的優(yōu)對網(wǎng)絡(luò)發(fā)生的變化能夠快速響當(dāng)網(wǎng)絡(luò)發(fā)生變化的時(shí)候發(fā)送觸發(fā)式更新(triggeredupdate) 03716611OSPF協(xié)議概述:鏈路狀態(tài)OSPF協(xié)議概述:鏈路狀態(tài)路由協(xié)議對以下信息進(jìn)鄰居本區(qū)域里的所有路由到達(dá)目標(biāo)網(wǎng)絡(luò)的最佳路03716611OSPF協(xié)議概述鄰居表OSPF協(xié)議概述鄰居表鄰居路由器的信拓?fù)浔硪步墟溌窢顟B(tài)數(shù)據(jù)路由表到達(dá)目標(biāo)網(wǎng)絡(luò)的最佳路03716611OSPF協(xié)議概述IOSPF引入了區(qū)域的概念域分2種1.骨域(area2.非骨域注意,所有

2、的非骨干區(qū)域必須和骨OSPF協(xié)議概述IOSPF引入了區(qū)域的概念域分2種1.骨域(area2.非骨域注意,所有的非骨干區(qū)域必須和骨03716611區(qū)區(qū)區(qū)區(qū)BackboneArea AreaArea AreaAutonomousOSPF協(xié)議概述03716611OSPF協(xié)議概述03716611OSPF協(xié)議概述OSPFOSPF協(xié)議概述OSPF0371661111ABLSA2552CLSA3LSA的3DLSA的1111ABABABAB2222CCCC33311ABLSA2552CLSA3LSA的3DLSA的1111ABABABAB2222CCCC3333DDDD03716611沒有PK引入DR E沒有沒

3、有PK引入DR E沒有D引入DR概念03716611引入DR后的路由信息更新流I need to update myroutingLinkeBA03716611引入DR后的路由信息更新流I need to update myroutingLinkeBA03716611OSPF協(xié)議概述規(guī)則DR/BDR 的時(shí)候要比o 包中的優(yōu)先級(jí)(priority),OSPF協(xié)議概述規(guī)則DR/BDR 的時(shí)候要比o 包中的優(yōu)先級(jí)(priority),優(yōu)先當(dāng)最高的為DR,次高的為BDR.默認(rèn)優(yōu)先級(jí)都為在優(yōu)先級(jí)相同的情況下就比較RouterID,RouterID最高的為DR,次高當(dāng)你把優(yōu)先級(jí)設(shè)置為0以后,OSPF路由器

4、就不能成為DR/BDR,只能完成后,DRother只和DR/BDR形成鄰接關(guān)系即DRLSU到DRother只組播LSU到DR路由器地址224.0.0.6,只有這個(gè)地03716611OSPF協(xié)議概述Router1.作用2.如?TherouterisknowntoOSPFbytheOSPFrouterIDLSDBsusetheOSPF協(xié)議概述Router1.作用2.如?TherouterisknowntoOSPFbytheOSPFrouterIDLSDBsusetheOSPFrouterIDtodifferentiateonerouterfromthe Bydefault,therouterIDi

5、sthehighestIPaddressonanerfaceatthemomentofOSPFsAerfacecanoverridetheOSPFrouterID.Ifaerfaceexists,therouterIDisthehighestIPaddressonanyTheOSPFrouter-routerdcanbeusedtooverridetheUsing a lo forstability.erfaceorarouter-d 03716611OSPF Network 12303716611OSPF Network 12303716611OSPF: -to-S SUsuallya Ma

6、yalsobeapo erfaceOSPF: -to-S SUsuallya Mayalsobeapo erfacerunningPPor-to-erfacerunningFrameRelayNoDRorBDRelectionOSPFautodetectserfaceOSPFpacketsaresentusingmulticast03716611Show R2#shSerial0/0isup,lineprotocolissID1,RouterShow R2#shSerial0/0isup,lineprotocolissID1,RouterID192.168.1.102,NetworkType,

7、Cost:TransmitDelayis1sec,e,ervalso10,Dead40,Wait40,Retransmitoduein03716611OSPF: Broadcast sGenerallytheseare,LANtechnologieslikeEthernetOSPF: Broadcast sGenerallytheseare,LANtechnologieslikeEthernetand Token Ring.DRandBDRselectionareAllneighborroutersformfulladjacencieswiththeDRand BDR only.Packets

8、 to the DR and the BDR use 224.0.0.6. PacketsfromDRtoallotherroutersuse224.0.0.5.03716611NetworkTypeR3#shEthernet1/0isup,lineprotocolissID1,RouterNetworkTypeR3#shEthernet1/0isup,lineprotocolissID1,RouterID3.3.3.3,NetworkTypeBROADCAST,Cost:TransmitDelayis1sec,eDR,PriorityDesignatedRouter(ID)erfaceadd

9、ressBackupDesignatedrouter(ID)erfaceaddresservalso10,Dead40,Wait40,RetransmitodueinIndex2/2,floodqueuelength0 Next 0 x0(0)/0 x0(0)Lastfloodscanlengthisumisumis0Lastfloodis0NeighborCountis2,Adjacentneighborcountis2 Adjacent with neighbor 1.1.1.1Adjacentwithneighbor2.2.2.2 (BackupDesignatedofor0037166

10、11NBMAStar(HubanderconnectsmultipleANBMApportmultiplerouters,butbroadcastingR3#shSerial0/3isNBMAStar(HubanderconnectsmultipleANBMApportmultiplerouters,butbroadcastingR3#shSerial0/3isup,lineprotocolisernetAddress13.13.13.1/24,AreasID1,RouterID3.3.3.3,NetworkTypeNON_BROADCAST,Cost:64 Transmit Delay is

11、 1 sec, Se WAITING, Priority 1NodesignatedrouteronthisNobackupdesignatedrouteronthiservalso30,Dead120,Wait120,RetransmitodueinWaittimebeforeDesignatedrouterselection00:01:54 Index 3/3, flood queue length 0NextLastfloodscanlengthisumisLastfloodis0umis0NeighborCountis0,Adjacentneighborcountisofor00371

12、6611配置單區(qū)域的 啟用將網(wǎng)段指派到指配置單區(qū)域的 啟用將網(wǎng)段指派到指定的區(qū)域指定路由器的router-03716611Router(config-router)#router-Router(config-router)#networkaddresswild-cardbitsareaarea-Router(config)#routerospfs-OSPF routerospfareaareaOSPF routerospfareaarearouterospfnetwork netwrok routerospfnetwork 13.13.13.0 0.0.0.255 areanetwrok 23.23.23.0 0.0.0.255 areaareaa