routing路由v2.0300-1012配置ospf视频课件07types of routers and lsas

1、TypesofOSPFBackbone Area AreaAreaABR and TypesofOSPFBackbone Area AreaAreaABR and ABR and ASBRand )46 8UZK )46 8UZK _VYUL LSALSA 1Router2Network3orSummaryAutonomous system external LSAs57Defined for not-so-stubby LSALSA 1Router2Network3orSummaryAutonomous system external LSAs57Defined for not-so-stu

2、bby LSAType1:RouterLSAType1:RouterOnerouter LSA(type 1)forevery routerinanIncludeslistofdirectlyattachedEachlinkidentifiedbyIPprefixassignedtolinkandlinkIdentifiedbytherouterIDoftheoriginatingFloodswithin itsareaonly;doesnotcrossLSAType2:NetworkeOnenetworkLSAType2:NetworkeOnenetwork(type2)LSAforeach

3、transitbroadcastorNBMAnetworkin an area Includeslistofattachedroutersonthetransit bnetmaskofAdvertisedbytheDRofthebroadcastFloodswithinitsareaonly;doesnotcrossLSAType3:SummaryTypeTypeTypeLSAType3:SummaryTypeTypeTypeType3LSAsareusedtofloodnetworkinformationtoareasoutsidetheoriginatingareaDescribesnet

4、worknumberandmaskoflink. Advertised by the ABR of originating area.RegeneratedbysubsequentABRstofloodthroughouttheautonomousBydefault,routesarenotsummarized,andtype3LSAisadvertisedforevery默认情况下，OSPF不会自动对一组连续的子网进行汇对于区域的每一个子网，SP类的SAA中；因此应该考虑在BRLSAType3的LSATypeTypeTypeType3的LSA过102LSA内容LSAType3的LSAType

5、TypeTypeType3的LSA过102LSA内容LSA类型133LSAType4:SummaryLSAtype4的产生和扩散：（首先有LSAType4:SummaryLSAtype4的产生和扩散：（首先有ASBR产生一个1类的路由器LSA，所在区域的ABR收到后， Summary(type4)LSAsareusedtoadvertiseanASBRtoallotherareas autonomous system.TheyaregeneratedbytheABRoftheoriginatingarea.Theyareregeneratedbyall subsequent ABRs to f

6、lood throughout the autonomous system.Type4LSAs herouter IDof theLSAType4首先有ASBR产生一个1类的路由器SA，所在区域的ABR收到后，创建一个4LLSAType4首先有ASBR产生一个1类的路由器SA，所在区域的ABR收到后，创建一个4LSAAe0。AB4类LSA）Type4LSAstherouter IDoftheType4的LSA过102LSA内容LSA类型144LSAType5:ExternalLSAType5:ExternalExternal(type5)LSAsareusedtoadvertisenetwor

7、ksfromotherautonomoussystems. Type 5 LSAs are advertised and owned by the originating ASBR.Type5LSAsfloodthroughouttheentireautonomousTheadvertisingrouterID(ASBR)isunchangedthroughouttheautonomoussystem. Type 4 LSA is needed to find the ASBR.Bydefault,routesarenotLSAType5Type3的LSA过Type5的LSA过102102LS

8、A内容LSA内LSA类型133LSA类型LSAType5Type3的LSA过Type5的LSA过102102LSA内容LSA内LSA类型133LSA类型retingtheOSPFretingtheOSPFRouterA#showpfOSPF Router with ID (10.0.0.11) (ProsID1) Router Link Ses (Area 0)Link IDADV RouterChecksumLinkcount 0 x80000002 0 x00401A 10 x800000040 x003A1B100.100.100.100 100.100.100.100 0 x800002D70 x00EEA9NetLinkes(AreaLink IDADV Router100.100.100.100 0 x80000001SummaryNetLinkes(AreaLink IDADV Router0 x800000010 x80000001outputTypeofR1上可以看到全部的5种AreaAreaAreaTypeofR1上可以看到全部的5种AreaAreaAreaAreaAreaTherearefourTherearefourOS