【正文】 S0 1 6 0 0 Routing Table S0 S1 S1 S0 5 1 0 0 169。 1999, Cisco Systems, Inc. ICND—930 解決方法：水平分割 不會(huì)接收到由自身傳達(dá)出去的路由信息 A B C E0 S0 S0 S1 S0 E0 X X X Routing Table S0 S0 S0 S0 1 2 0 0 Routing Table E0 S0 S0 S0 1 2 0 0 Routing Table S0 S1 S1 E1 1 2 0 0 169。 1999, Cisco Systems, Inc. ICND—932 解決方法：反轉(zhuǎn)毒殺 反轉(zhuǎn)毒殺可以超越水平分割 A B C E0 S0 S0 S1 S0 E0 X Routing Table S0 S0 S0 S0 1 2 0 Infinity Routing Table E0 S0 S0 S0 1 2 0 0 Routing Table S0 S1 S1 E1 Possibly Down 2 0 0 Poison Reverse 169。 1999, Cisco Systems, Inc. ICND—934 解決方法：觸發(fā)更新 當(dāng)路由表發(fā)生變化時(shí)路由器立即發(fā)送更新信息 A B C E0 S0 S0 S1 S0 E0 X Network is unreachable Network is unreachable Network is unreachable 169。 1999, Cisco Systems, Inc. ICND—936 路由器配置 ? 選擇路由協(xié)議 ? 指定網(wǎng)絡(luò)或端口 Network Network IGRP, RIP Network RIP RIP IGRP IP路由的配置任務(wù) 169。 1999, Cisco Systems, Inc. ICND—938 kbps T1 T1 T1 ? Hop 計(jì)算 ? 路由器每隔 30秒更新 ? 最多支持相同 hop數(shù)的 6條路徑 RIP 概 述 169。 1999, Cisco Systems, Inc. ICND—940 router rip work work RIP 配置舉例 router rip work router rip work work S2 E0 S3 S2 S3 A B C E0 169。 1999, Cisco Systems, Inc. ICND—942 查看路由表 RouterAsh ip route Codes: C connected, S static, I IGRP, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2, E EGP i ISIS, L1 ISIS level1, L2 ISIS level2, * candidate default U peruser static route, o ODR T traffic engineered route Gateway of last resort is not set , 1 subs C is directly connected, Ether0 , 2 subs R [120/1] via , 00:00:07, Serial2 C is directly connected, Serial2 R [120/2] via , 00:00:07, Serial2 S2 E0 S3 S2 S3 A B C E0 169。 1999, Cisco Systems, Inc. ICND—944 ? 使用 IGRP的網(wǎng)絡(luò)較大 ? 缺省 100hops， 最大 255hops ? 支持多路徑 IGRP 介 紹 IGRP 169。 1999, Cisco Systems, Inc. ICND—946 ? 最多六條路徑 ? 下一次所要到達(dá)的路由器必須接近目的網(wǎng)絡(luò) ? 在允許的參數(shù)內(nèi)選擇路徑 New Route Initial Route Source Destination IGRP 的不平衡路徑 169。 1999, Cisco Systems, Inc. ICND—948 router igrp 100 work work IGRP 配置舉例 router igrp 100 work router igrp 100 work work Autonomous System = 100 S2 E0 S3 S2 S3 A B C E0 169。 1999, Cisco Systems, Inc. ICND—950 查看 IP路由表 RouterAsh ip route Codes: C connected, S static, I IGRP, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2, E EGP i ISIS, L1 ISIS level1, L2 ISIS level2, * candidate default U peruser static route, o ODR T traffic engineered route Gateway of last resort is not set , 1 subs C is directly connected, Ether0 , 2 subs I [100/90956] via , 00:00:23, Serial2 C is directly connected, Serial2 I [100/91056] via , 00:00:23, Serial2 S2 E0 S3 S2 S3 A B C E0 169。 1999, Cisco Systems, Inc. ICND—952 OSPF協(xié)議計(jì)算路由過程 LSDB LSA 的 RTA LSA 的 RTB LSA 的 RTC LSA 的 RTD （二）每臺(tái)路由器的鏈 路狀態(tài)數(shù)據(jù)庫 (一）網(wǎng)絡(luò)的拓樸結(jié)構(gòu) C A B D 1 2 3 C A B D 1 2 3 C A B D 1 2 3 C A B D 1 2 3 （四）每臺(tái)路由器分別以自己為根節(jié)點(diǎn)計(jì)算最小生成樹 （三）由鏈路狀態(tài)數(shù)據(jù)庫得 到的帶權(quán)有向圖 C A B D 1 2 3 5 RTC RTD 3 2 1 5 RTB RTA 169。 1999, Cisco Systems, Inc. ICND—954 OSPF 配置舉例 Can Assign Network or Interface Address. Broadcast Network PointtoPoint Network E0 E0 S0 10. S1 A B C Output Omitted interface Ether0 ip address ! Output Omitted router ospf 1 work area 0 Output Omitted interface Ether0 ip address ! interface Serial0 ip address Output Omitted router ospf 50 work area 0 work area 0 169。 1999, Cisco Systems, Inc. ICND—956 show ip ospf interface R2sh ip ospf int e0 Ether0 is up, line protocol is up Inter Address , Area 0 Process ID 1, Router ID , Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State DROTHER, Priority 1 Designated Router (ID) , Interface 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 3, Adjacent neighbor count is 2 Adjacent with neighbor (Backup Designated Router) Adjacent with n