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《網(wǎng)絡(luò)互聯(lián)技術(shù) 梁廣民王隆杰CHP09OSPF_9.2OSPF網(wǎng)絡(luò)類型和DR選舉.ppt》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、開放鏈路最短優(yōu)先OpenShortestPathFirst深圳職業(yè)技術(shù)學(xué)院電子與通信工程學(xué)院教學(xué)目標(biāo)（Objectives）1.OSPF特征（FeatureofOSPF）2.OSPF術(shù)語（OSPFTerminology）3.OSPF數(shù)據(jù)包類型（OSPFPacketTypes）4.OSPF網(wǎng)絡(luò)類型（OSPFNetworkTypes）5.選舉DR和BDR（ElectingtheDRandBDR）6.OSPF基本配置（ConfiguringBasicOSPF）7.OSPF路由器類型（TypesofOSPFRouters）8.OSPF區(qū)域類型（TypesofAreas
2、）9.OSPF驗(yàn)證（OSPFAuthentication）10.OSPF虛鏈路（OSPFVirtualLink）第二節(jié)OSPF網(wǎng)絡(luò)類型和DR選舉OSPF網(wǎng)絡(luò)類型（OSPFNetworkTypes）NetworkTypeCharacteristicsDR/BDRElected?以太網(wǎng)（Ethernet）Yes幀中繼（FrameRelay）YesPPP,HDLCNo管理員用子接口配置（Configuredbyadministratorwithsubinterfaces）NoFrameRelayX.25廣播BroadcastMultiaccess非廣播Nonbroa
3、dcastMultiaccess點(diǎn)到點(diǎn)Point-to-Point點(diǎn)到多點(diǎn)Point-to-Multipoint點(diǎn)到點(diǎn)鏈路（Point-to-PointLinks）1.不進(jìn)行DR選舉NoDRorBDRelectionrequired2.OSPF自動檢測這種接口類型OSPFautodetectsthisinterfacetype廣播型多路訪問網(wǎng)絡(luò) （MultiaccessBroadcastNetwork）1.進(jìn)行DR選舉DRandBDRselectionrequired2.鄰居只與DR和DBR形成鄰接關(guān)系A(chǔ)llneighborroutersformfulladj
4、acencieswiththeDRand BDRonly選舉DR和BDR（ElectingtheDRandBDR）1.最高接口優(yōu)先級的路由器被選成DRTherouterwiththehighestOSPFpriorityis selectedastheDR.2.最高路由器ID的路由器被選舉成DRUsetheOSPFrouterIDasthetiebreaker.3.DR選舉不具有搶占性TheDRelectionisnonpreemptive.確定OSPF路由器ID（OSPFRouterID）1.通過router-id命令指定的最為優(yōu)先AnOSPFrouter-
5、idcommandcanoverrideOSPFrouterID.2.最高的環(huán)回接口地址次之AloopbackinterfacecanoverrideOSPFrouterID.ItisthehighestIPaddressofanyactiveloopbackinterface.3.最后是最高活動的物理接口的IP地址therouterIDisthehighestIPaddressonanactiveinterfaceatthemomentofOSPFprocessstartup.為了穩(wěn)定，命令或環(huán)回接口被推薦Theloopbackorrouter-idcomm
6、andisrecommended forstability.環(huán)回接口（LoopbackInterfaces）interfaceloopback0ipaddress172.16.17.5255.255.255.255如果ospf路由進(jìn)程已經(jīng)啟動，必須重新清除ospf進(jìn)程，新的路由器ID才生效。IftheOSPFprocessisalreadyrunning,theOSPFprocessmustbeclearedbeforethenewrouter-idcommandwilltakeeffect.Router(config)#Router(config-if)#r
7、outer-idip-address這是路由進(jìn)程下的子命令Thiscommandissubordinatetotherouter-idospfcommand.用clearipospfprocess命令可以使得配置生效。IfthiscommandisusedonanOSPFprocessthatisalreadyactive,thenthenewrouterIDisusedatthenextreloadoratamanualOSPFprocessrestartusingtheclearipospfprocesscommand.OSPFrouter-id命令 （O
8、SPFrouter-idcommand
