一、场景设置
说明：R1 Serial1/0 R2 Serial1/1 R3 Serial1/0 R4。需要在RB上配置路由再分配。
二、具体配置
1、RA的配置如下：
Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 199.99.1.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#router rip
RA(config-router)#version 2
RA(config-router)#network 1.0.0.0
RA(config-router)#network 199.99.1.0
RA(config-router)#exit
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 199.99.1.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#router rip
RA(config-router)#version 2
RA(config-router)#network 1.0.0.0
RA(config-router)#network 199.99.1.0
RA(config-router)#exit
2、RB的配置如下：
Router(config)#hostname RB
RB(config)#interface Loopback0
RB(config-if)#ip address 2.2.2.2 255.255.255.0
RB(config-if)#ip ospf network point-to-point
RB(config-if)#exit
RB(config)#interface Serial1/0
RB(config-if)#ip address 199.99.1.2 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#interface Serial1/1
RB(config-if)#ip address 199.99.2.1 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#router ospf 1
RB(config-router)#redistribute rip subnets
RB(config-router)#network 199.99.2.0 0.0.0.255 area 0
RB(config-router)#network 2.2.2.0 0.0.0.255 area 0
RB(config-router)#exit
RB(config)#router rip
RB(config-router)#version 2
RB(config-router)#redistribute ospf 1 metric 2
RB(config-router)#network 199.99.1.0
RB(config-router)#no auto-summary
RB(config-router)#exit
RB(config)#interface Loopback0
RB(config-if)#ip address 2.2.2.2 255.255.255.0
RB(config-if)#ip ospf network point-to-point
RB(config-if)#exit
RB(config)#interface Serial1/0
RB(config-if)#ip address 199.99.1.2 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#interface Serial1/1
RB(config-if)#ip address 199.99.2.1 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#router ospf 1
RB(config-router)#redistribute rip subnets
RB(config-router)#network 199.99.2.0 0.0.0.255 area 0
RB(config-router)#network 2.2.2.0 0.0.0.255 area 0
RB(config-router)#exit
RB(config)#router rip
RB(config-router)#version 2
RB(config-router)#redistribute ospf 1 metric 2
RB(config-router)#network 199.99.1.0
RB(config-router)#no auto-summary
RB(config-router)#exit
3、RC的配置如下：
RC(config)#hostname RC
RC(config)#interface Loopback0
RC(config-if)#ip address 3.3.3.3 255.255.255.0
RC(config-if)#ip ospf network point-to-point
RC(config-if)#exit
RC(config)#interface Serial1/1
RC(config-if)#ip address 199.99.2.2 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#interface Serial1/0
RC(config-if)#ip address 199.99.3.1 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#router ospf 1
RC(config-router)#network 3.3.3.0 0.0.0.255 area 1
RC(config-router)#network 199.99.2.0 0.0.0.255 area 0
RC(config-router)#network 199.99.3.0 0.0.0.255 area 1
RC(config-router)#exit
RC(config)#interface Loopback0
RC(config-if)#ip address 3.3.3.3 255.255.255.0
RC(config-if)#ip ospf network point-to-point
RC(config-if)#exit
RC(config)#interface Serial1/1
RC(config-if)#ip address 199.99.2.2 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#interface Serial1/0
RC(config-if)#ip address 199.99.3.1 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#router ospf 1
RC(config-router)#network 3.3.3.0 0.0.0.255 area 1
RC(config-router)#network 199.99.2.0 0.0.0.255 area 0
RC(config-router)#network 199.99.3.0 0.0.0.255 area 1
RC(config-router)#exit
4、RD的配置如下：
Router(config)#hostname RD
RD(config)#interface Loopback0
RD(config-if)#ip address 4.4.4.4 255.255.255.0
RD(config-if)#ip ospf network point-to-point
RD(config-if)#exit
RD(config)#interface Serial1/0
RD(config-if)#ip address 199.99.3.2 255.255.255.0
RD(config-if)#no shutdown
RD(config-if)#exit
RD(config)#router ospf 1
RD(config-router)#network 4.4.4.0 0.0.0.255 area 1
RD(config-router)#network 199.99.3.0 0.0.0.255 area 1
RD(config-router)#exit
RD(config)#interface Loopback0
RD(config-if)#ip address 4.4.4.4 255.255.255.0
RD(config-if)#ip ospf network point-to-point
RD(config-if)#exit
RD(config)#interface Serial1/0
RD(config-if)#ip address 199.99.3.2 255.255.255.0
RD(config-if)#no shutdown
RD(config-if)#exit
RD(config)#router ospf 1
RD(config-router)#network 4.4.4.0 0.0.0.255 area 1
RD(config-router)#network 199.99.3.0 0.0.0.255 area 1
RD(config-router)#exit
三、验证配置
1、查看各路由器相关接口的开启状态：
RA#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.1.1 YES manual up up
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.1.1 YES manual up up
Loopback0 1.1.1.1 YES manual up up
RB#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.1.2 YES manual up up
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.1.2 YES manual up up
Serial1/1 199.99.2.1 YES manual up up
Loopback0 2.2.2.2 YES manual up up
RC#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.3.1 YES manual up up
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.3.1 YES manual up up
Serial1/1 199.99.2.2 YES manual up up
Loopback0 3.3.3.3 YES manual up up
RD#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.3.2 YES manual up up
Interface IP-Address OK? Method Status Protocol
Serial1/0 199.99.3.2 YES manual up up
Loopback0 4.4.4.4 YES manual up up
可见相关的接口及链路协议已经处于开启状态！
2、查看各路由器的路由表：
RA#show 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 - IS-IS, su - IS-IS summary, 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
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 - IS-IS, su - IS-IS summary, 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
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
R 3.3.3.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
4.0.0.0/24 is subnetted, 1 subnets
R 4.4.4.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
R 199.99.3.0/24 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
R 199.99.2.0/24 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
C 199.99.1.0/24 is directly connected, Serial1/0
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
R 3.3.3.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
4.0.0.0/24 is subnetted, 1 subnets
R 4.4.4.0 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
R 199.99.3.0/24 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
R 199.99.2.0/24 [120/2] via 199.99.1.2, 00:00:17, Serial1/0
C 199.99.1.0/24 is directly connected, Serial1/0
RB#show 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 - IS-IS, su - IS-IS summary, 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
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 - IS-IS, su - IS-IS summary, 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
R 1.0.0.0/8 [120/1] via 199.99.1.1, 00:00:01, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
O IA 3.3.3.0 [110/65] via 199.99.2.2, 00:09:57, Serial1/1
4.0.0.0/24 is subnetted, 1 subnets
O IA 4.4.4.0 [110/129] via 199.99.2.2, 00:05:15, Serial1/1
O IA 199.99.3.0/24 [110/128] via 199.99.2.2, 00:06:06, Serial1/1
C 199.99.2.0/24 is directly connected, Serial1/1
C 199.99.1.0/24 is directly connected, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
O IA 3.3.3.0 [110/65] via 199.99.2.2, 00:09:57, Serial1/1
4.0.0.0/24 is subnetted, 1 subnets
O IA 4.4.4.0 [110/129] via 199.99.2.2, 00:05:15, Serial1/1
O IA 199.99.3.0/24 [110/128] via 199.99.2.2, 00:06:06, Serial1/1
C 199.99.2.0/24 is directly connected, Serial1/1
C 199.99.1.0/24 is directly connected, Serial1/0
RC#show 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 - IS-IS, su - IS-IS summary, 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
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 - IS-IS, su - IS-IS summary, 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
O E2 1.0.0.0/8 [110/20] via 199.99.2.1, 00:06:10, Serial1/1
2.0.0.0/24 is subnetted, 1 subnets
O 2.2.2.0 [110/65] via 199.99.2.1, 00:07:01, Serial1/1
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
4.0.0.0/24 is subnetted, 1 subnets
O 4.4.4.0 [110/65] via 199.99.3.2, 00:06:10, Serial1/0
C 199.99.3.0/24 is directly connected, Serial1/0
C 199.99.2.0/24 is directly connected, Serial1/1
O E2 199.99.1.0/24 [110/20] via 199.99.2.1, 00:06:10, Serial1/1
2.0.0.0/24 is subnetted, 1 subnets
O 2.2.2.0 [110/65] via 199.99.2.1, 00:07:01, Serial1/1
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
4.0.0.0/24 is subnetted, 1 subnets
O 4.4.4.0 [110/65] via 199.99.3.2, 00:06:10, Serial1/0
C 199.99.3.0/24 is directly connected, Serial1/0
C 199.99.2.0/24 is directly connected, Serial1/1
O E2 199.99.1.0/24 [110/20] via 199.99.2.1, 00:06:10, Serial1/1
RD#show 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 - IS-IS, su - IS-IS summary, 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
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 - IS-IS, su - IS-IS summary, 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
O E2 1.0.0.0/8 [110/20] via 199.99.3.1, 00:06:56, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/129] via 199.99.3.1, 00:06:56, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/65] via 199.99.3.1, 00:06:56, Serial1/0
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
C 199.99.3.0/24 is directly connected, Serial1/0
O IA 199.99.2.0/24 [110/128] via 199.99.3.1, 00:06:56, Serial1/0
O E2 199.99.1.0/24 [110/20] via 199.99.3.1, 00:06:56, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/129] via 199.99.3.1, 00:06:56, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/65] via 199.99.3.1, 00:06:56, Serial1/0
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
C 199.99.3.0/24 is directly connected, Serial1/0
O IA 199.99.2.0/24 [110/128] via 199.99.3.1, 00:06:56, Serial1/0
O E2 199.99.1.0/24 [110/20] via 199.99.3.1, 00:06:56, Serial1/0
3、在运行了OSPF协议的路由器查看邻居：
RB#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 0 FULL/ - 00:00:38 199.99.2.2 Serial1/1
3.3.3.3 0 FULL/ - 00:00:38 199.99.2.2 Serial1/1
RC#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 0 FULL/ - 00:00:31 199.99.2.1 Serial1/1
4.4.4.4 0 FULL/ - 00:00:34 199.99.3.2 Serial1/0
2.2.2.2 0 FULL/ - 00:00:31 199.99.2.1 Serial1/1
4.4.4.4 0 FULL/ - 00:00:34 199.99.3.2 Serial1/0
RD#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 0 FULL/ - 00:00:33 199.99.3.1 Serial1/0
3.3.3.3 0 FULL/ - 00:00:33 199.99.3.1 Serial1/0
4、在运行了OSPF协议的路由器查看OSPF数据库：
RB#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 776 0x80000004 0x00D838 3
3.3.3.3 3.3.3.3 772 0x80000002 0x00DC49 2
2.2.2.2 2.2.2.2 776 0x80000004 0x00D838 3
3.3.3.3 3.3.3.3 772 0x80000002 0x00DC49 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.0 3.3.3.3 780 0x80000001 0x00CC5A
4.4.4.0 3.3.3.3 481 0x80000001 0x002BB8
199.99.3.0 3.3.3.3 532 0x80000001 0x00C2FF
3.3.3.0 3.3.3.3 780 0x80000001 0x00CC5A
4.4.4.0 3.3.3.3 481 0x80000001 0x002BB8
199.99.3.0 3.3.3.3 532 0x80000001 0x00C2FF
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.0.0.0 2.2.2.2 1328 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1328 0x80000001 0x00D299 0
1.0.0.0 2.2.2.2 1328 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1328 0x80000001 0x00D299 0
RC#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 791 0x80000004 0x00D838 3
3.3.3.3 3.3.3.3 786 0x80000002 0x00DC49 2
2.2.2.2 2.2.2.2 791 0x80000004 0x00D838 3
3.3.3.3 3.3.3.3 786 0x80000002 0x00DC49 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.0 3.3.3.3 794 0x80000001 0x00CC5A
4.4.4.0 3.3.3.3 494 0x80000001 0x002BB8
199.99.3.0 3.3.3.3 545 0x80000001 0x00C2FF
3.3.3.0 3.3.3.3 794 0x80000001 0x00CC5A
4.4.4.0 3.3.3.3 494 0x80000001 0x002BB8
199.99.3.0 3.3.3.3 545 0x80000001 0x00C2FF
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 509 0x80000004 0x0010F0 3
4.4.4.4 4.4.4.4 508 0x80000003 0x000FEB 3
3.3.3.3 3.3.3.3 509 0x80000004 0x0010F0 3
4.4.4.4 4.4.4.4 508 0x80000003 0x000FEB 3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.0 3.3.3.3 779 0x80000001 0x007376
199.99.2.0 3.3.3.3 809 0x80000001 0x00CDF5
2.2.2.0 3.3.3.3 779 0x80000001 0x007376
199.99.2.0 3.3.3.3 809 0x80000001 0x00CDF5
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 3.3.3.3 799 0x80000001 0x0047A0
2.2.2.2 3.3.3.3 799 0x80000001 0x0047A0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.0.0.0 2.2.2.2 1363 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1365 0x80000001 0x00D299 0
1.0.0.0 2.2.2.2 1363 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1365 0x80000001 0x00D299 0
RD#show ip ospf database
OSPF Router with ID (4.4.4.4) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 523 0x80000004 0x0010F0 3
4.4.4.4 4.4.4.4 522 0x80000003 0x000FEB 3
3.3.3.3 3.3.3.3 523 0x80000004 0x0010F0 3
4.4.4.4 4.4.4.4 522 0x80000003 0x000FEB 3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.0 3.3.3.3 793 0x80000001 0x007376
199.99.2.0 3.3.3.3 803 0x80000001 0x00CDF5
2.2.2.0 3.3.3.3 793 0x80000001 0x007376
199.99.2.0 3.3.3.3 803 0x80000001 0x00CDF5
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 3.3.3.3 793 0x80000001 0x0047A0
2.2.2.2 3.3.3.3 793 0x80000001 0x0047A0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.0.0.0 2.2.2.2 1357 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1359 0x80000001 0x00D299 0
1.0.0.0 2.2.2.2 1357 0x80000001 0x009EF8 0
199.99.1.0 2.2.2.2 1359 0x80000001 0x00D299 0