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【正文】 rface Address Backup Designated Router (ID) Interface Address Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:04 Neighbor Count is 1, Adjacent neighbor count is 1 Neighbor information : Neighbor ID State Address Interface Full/DR eth1/0: 廣播類型網(wǎng)絡接口的數(shù)據(jù)結(jié)構(gòu) 智慧無盡 .創(chuàng)意無限 OSPF接口數(shù)據(jù)結(jié)構(gòu)(續(xù)) NBMA類型網(wǎng)絡接口的數(shù)據(jù)結(jié)構(gòu) RT1 show ip ospf interface s0/0 serial0/0 is up, line protocol is up Inter Address , Area () Router ID , Network Type POINTOMULTIPOINT, Cost: 1563 Transmit Delay is 1 sec, State PointToPoint, Priority 1 flag20483 ifptype4 No designated router on this work No backup designated router on this work Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5 Hello due in 00:00:07 Neighbor Count is 2, Adjacent neighbor count is 2 Neighbor information : Neighbor ID State Address Interface Full/DROther serial0/0: Full/DROther serial0/0: 智慧無盡 .創(chuàng)意無限 接口狀態(tài)機( interface state machine) ? OSPF協(xié)議接口的變化過程 Down Waiting Loopback DR Backup DRother PointtoPoint DR/BDR選舉 PointtoPoint網(wǎng)絡類型 廣播型 /NBMA網(wǎng)絡類型 智慧無盡 .創(chuàng)意無限 相鄰( Adjacency)關(guān)系建立過程 ? 鄰居發(fā)現(xiàn)( Neighbor discovery) ? 雙向通信( Bidirectional munication) ? 數(shù)據(jù)庫同步( Database synchronization) – 數(shù)據(jù)庫描述( Database Description) – 鏈路狀態(tài)查詢( Link State Request) – 鏈路狀態(tài)更新( Link State Update) ? 相鄰關(guān)系建立( Full adjacency) 智慧無盡 .創(chuàng)意無限 鄰居狀態(tài) ? Down:沒有從鄰居處接收到信息,但努力嘗試同網(wǎng)絡鄰居聯(lián)系 ? init:從網(wǎng)絡鄰居處接收到 HELLO包,但路由器本身并沒有在該 HELLO包中列出 ? twoway:同網(wǎng)絡鄰居建立了雙向通訊 ? Exstart:用于 DD同步 ,確定主 /輔助路由器、 DD包的第一個序列號 ? exchange:路由器通過 DD包描述了整個鏈路狀態(tài)數(shù)據(jù)庫,一次發(fā)送一個 DD包。也可發(fā)送鏈路狀態(tài)請求,以請求新的 LSA ? loading :系統(tǒng)發(fā)鏈路狀態(tài)請求包,以得到更新的 LSA(在交換期間沒有收到的 LSA) ? full:所有信息都已交換 智慧無盡 .創(chuàng)意無限 鄰居數(shù)據(jù)結(jié)構(gòu) ( Neighbor Data Structure) RT2 show ip ospf neighbor detail Neighbor , interface address In the area () via interface eth1/0 Neighbor priority is 1, State is Full, 6 state changes DR is , BDR is Options 2 *|*|||||E|* Dead timer due in 00:00:38 Database Summary List 0 Link State Request List 0 Link State Retransmission List 0 Thread Inactivity Timer on Thread Database Description Retransmision off Thread Link State Request Retransmission on Thread Link State Update Retransmission on 智慧無盡 .創(chuàng)意無限 鄰居狀態(tài)機( Neighbor State Machine) 由鄰居( neighbor)狀態(tài)到建立相鄰( adjacency)關(guān)系的過程 RT1 RT2 Down Down Hello( DR=, Neighbors Seen=0) Init Hello( DR=RT2, Neighbors Seen=RT1) ExStart DD( Seq=x, I=1, M=0, MS=1) ExStart DD( Seq=y, I=1, M=1, MS=1) Exchange DD( Seq=y, I=0, M=1, MS=0) Exchange DD( Seq=y+1, I=0, M=1, MS=1) DD( Seq=y+1, I=0, M=1, MS=0) DD( Seq=y+n, I=0, M=0, MS=1) Loading DD( Seq=y+n, I=0, M=0, MS=0) LS Request Full LS Update LS Request LS Update Full 智慧無盡 .創(chuàng)意無限 Debug信息- 鄰居狀態(tài)機 RT2 debug ip ospf nsm OSPF: NSM[eth1/0::]: Down (HelloReceived) OSPF: NSM[eth1/0::]: Status change Down Init OSPF: NSM[eth1/0::]: Init (2WayReceived) OSPF: NSM[eth1/0::]: Status
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