【正文】 connected, S static, 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 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static routeGateway of last resort is not set , 5 subnetsD [90/7292416] via , 00:02:24, Serial1/，但是路由表中只有一條通往該網(wǎng)絡(luò)的路由D [90/7289856] via , 00:02:24, Serial1/0C is directly connected, Serial1/0C is directly connected, Serial1/2C is directly connected, FastEthernet0/0 R1show ip eigrp topology查看EIGRP的拓撲表P , 1 successors, FD is 7292416P代表該網(wǎng)絡(luò)可用，可被加入到路由表重穩(wěn)定的網(wǎng)絡(luò)處于被動狀態(tài)，1 Successors代表有1個當前后繼路由，它到達目的地的FD最小，此后繼路由的可行距離FD是7292416 via (7292416/6780416), Serial1/0這條就是當前后繼路由，將被加入到路由表中 via (27260416/28160), Serial1/2這條是可行后繼路由，即必須滿足ADFD(281607292416)，如果當前后繼路由從路由表中消失，可行后繼路由就會加入到路由表中P , 1 successors, FD is 7289856 via (7289856/6777856), Serial1/0 via (27769856/2169856), Serial1/2P , 1 successors, FD is 2169856 via Connected, Serial1/0P , 1 successors, FD is 27257856 via Connected, Serial1/2 via (7801856/7289856), Serial1/0P , 1 successors, FD is 28160 via Connected, FastEthernet0/0 將R1的variance值修改為20后，觀察路由表。R1(config)router eigrp 110R1(configrouter)variance 20定義variance的值與Successors的FD的乘積大于Feasible Successor的FD時，就能實現(xiàn)EIGRP在不等成本的負載均衡R1(configrouter)endR1show ip route Codes: C connected, S static, 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 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static routeGateway of last resort is not set , 5 subnetsD [90/7292416] via , 00:00:03, Serial1/0 [90/27260416] via , 00:00:03, Serial1/，實現(xiàn)了不等價負載均衡 動態(tài)路由協(xié)議單域OSPF配置實驗?zāi)康?1. 理解動態(tài)路由協(xié)議OSPF的內(nèi)容； 2. 理解OSPF等鏈路狀態(tài)協(xié)議的算法處理過程； 3. 掌握OSPF的基本配置，并與距離失量協(xié)議的配置過程相比較； 4. 掌握DR和BDR，手動配置DR、BDR。 實驗拓撲如下實驗過程：R1配置如下：R1(config)interface Loopback0R1(configif)ip address R1(configif)interface FastEthernet0/0R1(configif)ip address R1(configif)interface Serial1/0R1(configif)ip address R1(configif)clock rate 64000R1(config)router ospf 110OSPF路由配置模式，進程號為110R1(configrouter)routerid R1(configrouter)network area ，并定義這個地址在區(qū)域0內(nèi)R1(configrouter)network area ，并定義這個網(wǎng)段在區(qū)域0內(nèi)R1(configrouter)network area 0R2配置如下：R2(config)interface Loopback0R2(configif)ip address R2(configif)interface Serial1/0R2(configif)ip address R2(configif)clock rate 64000R2(configif)interface Serial1/1R2(configif)ip address R2(configif)clock rate 64000R2(config)router ospf 110R2(configrouter)routerid R2(configrouter)network area 0R2(configrouter)network area 0R2(configrouter)network area 0R3配置如下：R3(config)interface Loopback0進入接口配置模式，配置一個環(huán)回口R3(configif)ip address R3(configif)interface FastEthernet0/0R3(configif)ip address R3(configif)interface Serial1/1R3(configif)ip address R3(configif)clock rate 64000R3(config)router ospf 110R3(configrouter)routerid R3(configrouter)network area 0R3(configrouter)network area 0R3(configrouter)network area 0查看RRR3路由表R1show ip route Codes: C connected, S static, 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 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static routeGateway of last resort is not set , 1 subnetsC is directly connected, Loopback0 , 1 subnetsO [110/65] via , 00:05:53, Serial1/0 , 1 subnetsO代表OSPF的路由表項，從本地端口Serial1/，建立鄰居時間為05：53O [110/2] via , 00:05:53, FastEthernet0/0 , 3 subnetsO [110/65] via , 00:05:53, FastEthernet0/0C is directly connected, Serial1/0C is directly connected, FastEthernet0/0R2show ip route Codes: C connected, S static, 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 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static routeGateway of last resort is not set , 1 subnetsO [110/65] via , 00:06:12, Serial1/0 , 1 subnetsC is directly connected, Loopback0 , 1 subnetsO [110/65] via , 00:06:12, Serial1/1 , 3 subnetsC is directly connected, Serial1/1C is directly connected, Serial1/0O [110/65] via , 00:06:12, Serial1/0 [110/65] via , 00:06:12, Serial1/1R3show ip route Codes: C connected, S static, 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 exter