OSPF中的路由汇总配置-Cisco思科认证考试网-优易学

OSPF中的路由汇总配置

来源：优易学 2011-12-2 10:01:48 【优易学：中国教育考试门户网】资料下载 IT书店

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。

责任编辑：小草

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