OSPF中的路由汇总配置

　　目的：通过汇总减少路由器由于路由表中的路由条目过多产生的负担

　　

　　路由器的基本配置：

　　r1#sho run

　　!

　　interface Loopback0

　　ip address 199.172.16.1 255.255.255.0

　　!

　　interface Loopback1

　　ip address 199.172.17.1 255.255.255.0

　　!

　　interface Loopback2

　　ip address 199.172.18.1 255.255.255.0

　　!

　　interface Loopback3

　　ip address 199.172.19.1 255.255.255.0

　　!

　　interface FastEthernet0/0

　　ip address 12.0.0.1 255.255.255.0

　　duplex half

　　!

　　router ospf 110

　　log-adjacency-changes

　　network 0.0.0.0 255.255.255.255 area 12

　　!

　　!

　　End

　　r2#sho run

　　!

　　interface FastEthernet0/0

　　ip address 12.0.0.2 255.255.255.0

　　duplex half

　　!

　　interface Serial2/2

　　ip address 23.0.0.2 255.255.255.0

　　serial restart-delay 0

　　!

　　router ospf 110

　　log-adjacency-changes

　　area 12 range 199.172.16.0 255.255.252.0 //路由汇总

　　network 12.0.0.0 0.0.0.255 area 12

　　network 23.0.0.0 0.0.0.255 area 0

　　!

　　End

　　r3#sho run

　　!

　　interface Serial2/1

　　ip address 23.0.0.3 255.255.255.0

　　serial restart-delay 0

　　!

　　interface Serial2/2

　　ip address 34.0.0.3 255.255.255.0

　　serial restart-delay 0

　　!

　　router ospf 110

　　log-adjacency-changes

　　network 23.0.0.0 0.0.0.255 area 0

　　network 34.0.0.0 0.0.0.255 area 34

　　!

　　End

　　r4#sho run

　　!

　　interface Loopback0

　　ip address 151.100.32.1 255.255.255.0

　　!

　　interface Loopback1

　　ip address 151.100.33.1 255.255.255.0

　　!

　　interface Loopback2

　　ip address 151.100.34.1 255.255.255.0

　　!

　　interface Loopback3

　　ip address 151.100.35.1 255.255.255.0

　　!

　　interface Serial2/1

　　ip address 34.0.0.4 255.255.255.0

　　serial restart-delay 0

　　!

　　router ospf 110

　　log-adjacency-changes

　　summary-address 151.100.32.0 255.255.252.0

　　//路由汇总把区域外的路由条目汇总成一条,

　　redistribute connected subnets route-map hhh

　　//把域外的路由条目重分布到域内

　　network 34.0.0.0 0.0.0.255 area 34

　　!

　　route-map hhh permit 10

　　match interface Loopback0 Loopback1 Loopback2 Loopback3

　　!

　　End

　　查看路由表：

　　r1#sho 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 - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

　　* - candidate default, U - per-user static route, o - ODR

　　P - periodic downloaded static route

　　Gateway of last resort is not set

　　34.0.0.0/24 is subnetted, 1 subnets

　　O IA 34.0.0.0 [110/129] via 12.0.0.2, 00:11:38, FastEthernet0/0

　　23.0.0.0/24 is subnetted, 1 subnets

　　O IA 23.0.0.0 [110/65] via 12.0.0.2, 00:11:38, FastEthernet0/0

　　C 199.172.18.0/24 is directly connected, Loopback2

　　C 199.172.19.0/24 is directly connected, Loopback3

　　C 199.172.16.0/24 is directly connected, Loopback0

　　C 199.172.17.0/24 is directly connected, Loopback1

　　12.0.0.0/24 is subnetted, 1 subnets

　　C 12.0.0.0 is directly connected, FastEthernet0/0

　　151.100.0.0/22 is subnetted, 1 subnets

　　O E2 151.100.32.0 [110/20] via 12.0.0.2, 00:03:40, FastEthernet0/0

　　//经过汇总后重分布到域内的路由条目

　　r2#sho 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 - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

　　* - candidate default, U - per-user static route, o - ODR

　　P - periodic downloaded static route

　　Gateway of last resort is not set

　　34.0.0.0/24 is subnetted, 1 subnets

　　O IA 34.0.0.0 [110/128] via 23.0.0.3, 00:11:17, Serial2/2

　　23.0.0.0/24 is subnetted, 1 subnets

　　C 23.0.0.0 is directly connected, Serial2/2

　　199.172.18.0/32 is subnetted, 1 subnets

　　O 199.172.18.1 [110/2] via 12.0.0.1, 00:11:17, FastEthernet0/0

　　199.172.19.0/32 is subnetted, 1 subnets

　　O 199.172.19.1 [110/2] via 12.0.0.1, 00:11:17, FastEthernet0/0

　　199.172.16.0/32 is subnetted, 1 subnets

　　O 199.172.16.1 [110/2] via 12.0.0.1, 00:11:17, FastEthernet0/0

　　199.172.17.0/32 is subnetted, 1 subnets

　　O 199.172.17.1 [110/2] via 12.0.0.1, 00:11:17, FastEthernet0/0

　　12.0.0.0/24 is subnetted, 1 subnets

　　C 12.0.0.0 is directly connected, FastEthernet0/0

　　151.100.0.0/22 is subnetted, 1 subnets

　　O E2 151.100.32.0 [110/20] via 23.0.0.3, 00:04:38, Serial2/2

　　//经过汇总后重分布到域内的路由条目

　　O 199.172.16.0/22 is a summary, 00:11:28, Null0

　　//经过汇总后的路由条目

　　r3#sho 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 - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

　　* - candidate default, U - per-user static route, o - ODR

　　P - periodic downloaded static route

　　Gateway of last resort is not set

　　34.0.0.0/24 is subnetted, 1 subnets

　　C 34.0.0.0 is directly connected, Serial2/2

　　23.0.0.0/24 is subnetted, 1 subnets

　　C 23.0.0.0 is directly connected, Serial2/1

　　12.0.0.0/24 is subnetted, 1 subnets

　　O IA 12.0.0.0 [110/65] via 23.0.0.2, 00:13:25, Serial2/1

　　151.100.0.0/22 is subnetted, 1 subnets

　　O E2 151.100.32.0 [110/20] via 34.0.0.4, 00:05:06, Serial2/2

　　//经过汇总后重分布到域内的路由条目

　　O IA 199.172.16.0/22 [110/66] via 23.0.0.2, 00:11:57, Serial2/1

　　//经过汇总后的路由条目

　　r4#sho 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 - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

　　* - candidate default, U - per-user static route, o - ODR

　　P - periodic downloaded static route

　　Gateway of last resort is not set

　　34.0.0.0/24 is subnetted, 1 subnets

　　C 34.0.0.0 is directly connected, Serial2/1

　　23.0.0.0/24 is subnetted, 1 subnets

　　O IA 23.0.0.0 [110/128] via 34.0.0.3, 01:06:25, Serial2/1

　　12.0.0.0/24 is subnetted, 1 subnets

　　O IA 12.0.0.0 [110/129] via 34.0.0.3, 00:25:26, Serial2/1

　　151.100.0.0/16 is variably subnetted, 5 subnets, 2 masks

　　C 151.100.35.0/24 is directly connected, Loopback3

　　C 151.100.34.0/24 is directly connected, Loopback2

　　C 151.100.33.0/24 is directly connected, Loopback1

　　O 151.100.32.0/22 is a summary, 00:05:41, Null0

　　C 151.100.32.0/24 is directly connected, Loopback0

　　O IA 199.172.16.0/22 [110/130] via 34.0.0.3, 00:12:31, Serial2/1

　　///经过汇总后的路由条目

　　r1#ping 151.100.32.1

　　Type escape sequence to abort.

　　Sending 5, 100-byte ICMP Echos to 151.100.32.1, timeout is 2 seconds:

　　!!!!!

　　Success rate is 100 percent (5/5), round-trip min/avg/max = 296/440/564 ms

　　PING测试

　　r4#ping 199.172.19.1

　　Type escape sequence to abort.

　　Sending 5, 100-byte ICMP Echos to 199.172.19.1, timeout is 2 seconds:

　　!!!!!

　　Success rate is 100 percent (5/5), round-trip min/avg/max = 264/446/576 ms

　　由于路由条目过多，给路由器很大负担，因此通过汇总，减少路由器的负担。