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OSPF????????????????????IGP???????????????????????OSPF????????????LSDB????SPF??????????SPT??????????????OSPF????????
OSPF??????
OSPF?Open Shortest Path First?????????????????????????????????????????????????IGP?RIP?EIGRP???OSPF???????????????????Area?????????????????
OSPF??????????????????Hello??????????DBD??????????????????LSR??????????LSU????????????LSAck??????????????
OSPF????
OSPF???????????????????
??????Down??????????????????????????????
?????Hello??Init?????????????????????????????????????????
???????2-Way???????????Hello???????????????????????????
??DR?BDR?ExStart????????????????IP???????????DR??????????BDR??
??????Exchange?????????DBD?????????DBD?????LSR???????????????LSU?????????????
?????????Full???????????????????????????
OSPF????
OSPF????????????????
??????Point-to-Point?????????????????DR?BDR?????224.0.0.5?????
?????????Broadcast MultiAccess?BMA?????????????????????DR?BDR?????224.0.0.5?224.0.0.6?????
??????????Non-Broadcast MultiAccess?NBMA?????????????????????????DR?BDR?
???????Point-to-Multipoint?????????????????DR?BDR?????224.0.0.5?????
OSPF????
??????????????????????OSPF?????????????Area??????????????????????????????????????
????
?????Area 0??????????????????????????
??????????????????????????????????????????
?????Stub Area?
?????????
???????????????
?????????????????
?????????????????ASBR??
????????Area 0??
???????Totally Stubby Area?????????????????????????????????????
OSPF?????
???????????????????????????????????
????????Area Border Router?ABR???????????????????????????
??????????Autonomous System Border Router?ASBR????????????????????????????OSPF???
OSPF???????
OSPF????????????????????
???LSA?Type 1????????????????????
??LSA?Type 2???????DR???????????????
????LSA?Type 3???ABR????????????????
ASBR??LSA?Type 4???ABR??????ASBR????
????LSA?Type 5???ASBR?????????????
NSSA??LSA?Type 7???????????ASBR?????????????????
OSPF????
???????OSPF???????????????
ABR???
[R4]ospf 1[R4-ospf-1]area 0[R4-ospf-1-area-0.0.0.0]network x.x.x.x/24[R4-ospf-1-area-0.0.0.0]network y.y.y.y/24[R4-ospf-1-area-0.0.0.0]area 2[R4-ospf-1-area-0.0.0.2]network a.a.a.a/24[R4-ospf-1-area-0.0.0.2]stub
?????????
[R5]ospf 1[R5-ospf-1]area 2[R5-ospf-1-area-0.0.0.2]network a.a.a.a/24[R5-ospf-1-area-0.0.0.2]stub
???????????OSPF??????????????????????????????
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