OSPF路由协议优化

OSPF路由协议优化LSA的类型LSA类型发起者传递范围描述对象LSA1:RouterLSA区域中的每台路由器区域内传递描述路由器的直连链路状态信息LSA2:NetworkLSADR、BDR区域内传递描述本网段内直连的路由器LSA3：NetworkSummaryLSAABR区域间传递描述ABR所在区域内的路由信息（LSA1，LSA2）LSA4：ASBRSummaryLSAABR区域间传递通告ABR所在区域内的ASBR信息LSA5:AutonomoussystemexternalLSAASBR区域间传递通告外部路由（RIP,BGP等）LSA的类型ZXR10#showipospfdatabaseOSPFRouterwithID(110.1.1.1)(ProcessID1)RouterLinkStates(Area0.0.0.0)LinkIDADVRouterAgeSeq#ChecksumLinkcount110.1.1.1110.1.1.130x800000020x3dbe1SummaryNetLinkStates(Area0.0.0.0)LinkIDADVRouterAgeSeq#Checksum112.1.1.0110.1.1.160x800000010xd99f168.1.0.0110.1.1.160x800000010xff43SummaryASBLinkStates(Area0.0.0.0)LinkIDADVRouterAgeSeq#Checksum168.1.1.3110.1.1.160x800000010xc875RouterLinkStates(Area0.0.0.1)LinkIDADVRouterAgeSeq#ChecksumLinkcount110.1.1.1110.1.1.130x800000250xf8f81168.1.1.3168.1.1.3610x800000050x70e2NetLinkStates(Area0.0.0.1)LinkIDADVRouterAgeSeq#Checksum168.1.1.1110.1.1.111830x800000020x9787Type-5ASExternalLinkStatesLinkIDADVRouterAgeSeq#ChecksumTag113.1.0.0168.1.1.3480x800000010xa0dd0111.1.0.0110.1.1.12720x800000010x4ae33489660928多区域网络中LSU的洪泛Type1afadjfjorqpoeru39547439070713Area1Area0Area50Type3afadjfjorqpoeru39547439070713Type3afadjfjorqpoeru39547439070713RIPInternalABR1ABR2InternalBBoneType5afadjfjorqpoeru39547439070713Type5afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713Type4afadjfjorqpoeru39547439070713OSPF路由的组成路由表区域间路由区域内路由外部路由(非OSPF路由)Area1Area1Area0Area1RIP完全末节区Totallystub不接收区域外路由NetworkSummaryLSA不接收重分发路由ASBRSummaryLSAAutonomoussystemexternalLSA末节区Stub不接收重分发路由ASBRSummaryLSAAutonomoussystemexternalLSA骨干区

Area0骨干区域接收所有LSAAreas的类型Stub和TotallyStubby区域（1）Area1Area0Area50RIPCDABEFABRABRASBR1.1.1.01.1.2.01.1.3.02.1.1.02.1.2.03.1.1.03.1.2.04.1.1.04.1.2.01.1.1.0int1ospf1.1.2.0int1ospf1.1.3.0int1ospf2.1.1.0int1direct2.1.2.0int2direct3.1.1.0int1ospf3.1.2.0int1ospf4.1.1.0int1ospf4.1.2.0int1ospf1.1.1.0int1direct1.1.2.0int1ospf1.1.3.0int1ospf2.1.1.0int2direct2.1.2.0int2ospf3.1.1.0int1ospf3.1.2.0int1ospf4.1.1.0int1ospf4.1.2.0int1ospfRD路由表RC路由表1.1.1.0int1ospf1.1.2.0int1ospf1.1.3.0int1direct2.1.1.0int1ospf2.1.2.0int1ospf3.1.1.0int2direct3.1.2.0int2ospf4.1.1.0int1ospf4.1.2.0int1ospfRE路由表1.1.1.0int1ospf1.1.2.0int1ospf1.1.3.0int1ospf2.1.1.0int1ospf2.1.2.0int1ospf3.1.1.0int1direct3.1.2.0int2direct4.1.1.0int1ospf4.1.2.0int1ospfRF路由表Stub和TotallyStubby区域（2）DefaultDefaultSummaryDefaultArea1—TotallyStubbyArea0Area50—StubSummaryExternalExternalRIPafadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713afadjfjorqpoeru39547439070713InternalABR1ASBRBBoneABR2InternalSummaryafadjfjorqpoeru39547439070713Stub和TotallyStubby区域（3）Area1—TotallyStubbyArea0Area50—StubRIPCDABEFABRABRASBR1.1.1.01.1.2.01.1.3.02.1.1.02.1.2.03.1.1.03.1.2.04.1.1.04.1.2.01.1.1.0int1ospf1.1.2.0int1ospf1.1.3.0int1ospf2.1.1.0int1direct2.1.2.0int2direct3.1.1.0int1ospf3.1.2.0int1ospf0.0.0.0int1ospf1.1.1.0int1direct1.1.2.0int1ospf1.1.3.0int1ospf2.1.1.0int2direct2.1.2.0int2ospf3.1.1.0int1ospf3.1.2.0int1ospf4.1.1.0int1ospf4.1.2.0int1ospfRD路由表RC路由表1.1.1.0int1ospf1.1.2.0int1ospf1.1.3.0int1direct2.1.1.0int1ospf2.1.2.0int1ospf3.1.1.0int2direct3.1.2.0int2ospf4.1.1.0int1ospf4.1.2.0int1ospfRE路由表3.1.1.0int1direct3.1.2.0int2direct0.0.0.0int1ospfRF路由表通常只能有一个出口域内不能有ASBR不能是AREA0（Backbone）不能使用虚连接（Virtuallinks）末节和完全末节区域的限制单出口Area20.0.0.0外部

AS0.0.0.0R3R4XXNSSANotSoStubbyArea（非完全末节区域）ToOtherAreaType5Area20.0.0.0External

ASRIPType7Type7Area0R3R4NSSA区域不会自动生成默认路由，需要命令下发R3(config-router)#area2nssadefault-information-originate减小路由表的大小将拓扑变化的影响限制在本地减少LSAs的数量，节省CPU资源支持路由汇总Area0骨干区ABRsArea1汇总路由xx一条路由信息就可以代表多个子网路由汇总O172.16.8.0 255.255.252.0

O172.16.12.0 255.255.252.0

O172.16.16.0 255.255.252.0

O172.16.20.0 255.255.252.0

O172.16.24.0 255.255.252.0

O172.16.28.0 255.255.252.0路由器B的路由表发送至路由