OSPF stub

约定不等于承诺〃 2022-01-10 23:09 301阅读 0赞

实验TOP：

[![185949386.jpg][]][185949386.jpg]

**实验目的：学习ospf stub的配置和作用。**

一、 路由器初始配置：

1. R1上的初始配置

R1(config-line)\#int s2/1

R1(config-if)\#ip add 12.0.0.1 255.255.255.0

R1(config-if)\#no sh

R1(config-if)\#int lo 0

R1(config-if)\#ip add 1.1.1.1 255.255.255.0

R1(config-if)\#router os 1

R1(config-router)\#router-id 1.1.1.1

R1(config-router)\#net 1.1.1.1 0.0.0.0 a1

R1(config-router)\#net 12.0.0.1 0.0.0.0 a 1

2. R2上的初始配置：

R2(config-line)\#int s2/1

R2(config-if)\#ip add 12.0.0.2 255.255.255.0

R2(config-if)\#no sh

R2(config-if)\#int s2/2

R2(config-if)\#ip add 23.0.0.2 255.255.255.0

R2(config-if)\#no sh

R2(config-if)\#int lo 0

R2(config-if)\#ip add 2.2.2.2 255.255.255.0

R2(config-if)\#router os 1

R2(config-router)\#router-id 2.2.2.2

R2(config-router)\#net 2.2.2.2 0.0.0.0 a 0

R2(config-router)\#net 12.0.0.2 0.0.0.0 a 1

R2(config-router)\#net 23.0.0.2 0.0.0.0 a 0

3. R3上的初始配置：

R3(config-line)\#int s2/1

R3(config-if)\#ip add 23.0.0.3 255.255.255.0

R3(config-if)\#no sh

R3(config-if)\#int s2/2

R3(config-if)\#ip add 34.0.0.3 255.255.255.0

R3(config-if)\#no sh

R3(config-if)\#int lo 0

R3(config-if)\#ip add 3.3.3.3 255.255.255.0

R3(config-if)\#router os 1

R3(config-router)\#router-id 3.3.3.3

R3(config-router)\#net 3.3.3.3 0.0.0.0 a 0

R3(config-router)\#net 23.0.0.3 0.0.0.0 a 0

R3(config-router)\#net 34.0.0.3 0.0.0.0 a 2

4. R4上的初始配置：

R4(config-line)\#int s2/1

R4(config-if)\#ip add 34.0.0.4 255.255.255.0

R4(config-if)\#no sh

R4(config-if)\#int lo 0

R4(config-if)\#ip add 4.4.4.4 255.255.255.0

R4(config-if)\#router os 1

R4(config-router)\#router-id 4.4.4.4

R4(config-router)\#net 4.4.4.4 0.0.0.0 a2

R4(config-router)\#net 34.0.0.4 0.0.0.0 a 2

5. 查看OSPF的运行情况：

R2(config-router)\#do sh ip os ne

Neighbor ID Pri State Dead Time Address Interface

3.3.3.3 0 FULL/ - 00:00:31 23.0.0.3 Serial2/2

1.1.1.1 0 FULL/ - 00:00:31 12.0.0.1 Serial2/1

//查看R2上路由表信息

R2(config-router)\#do sh ip rout

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

34.0.0.0/24 is subnetted, 1 subnets

O IA 34.0.0.0 \[110/128\] via 23.0.0.3, 00:05:19, Serial2/2

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 \[110/65\] via 12.0.0.1, 00:06:02, Serial2/1

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

3.0.0.0/32 is subnetted, 1 subnets

O 3.3.3.3 \[110/65\] via 23.0.0.3, 00:05:19, Serial2/2

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 \[110/129\] via 23.0.0.3, 00:04:52, Serial2/2

23.0.0.0/24 is subnetted, 1 subnets

C 23.0.0.0 is directly connected, Serial2/2

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

//查看R1上的路由表信息

R1(config-router)\#do sh ip rout

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

34.0.0.0/24 is subnetted, 1 subnets

O IA 34.0.0.0 \[110/192\] via 12.0.0.2, 00:00:36, Serial2/1

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

O IA 2.2.2.2 \[110/65\] via 12.0.0.2, 00:01:23, Serial2/1

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 \[110/129\] via 12.0.0.2, 00:00:51, Serial2/1

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 \[110/193\] via 12.0.0.2, 00:00:14, Serial2/1

23.0.0.0/24 is subnetted, 1 subnets

O IA 23.0.0.0 \[110/128\] via 12.0.0.2, 00:01:23, Serial2/1

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

二、 实验过程：

将区域1配置为STUB区域：

R1(config-router)\#area 1 stub//在R1上将区域1配置为STUB

R2(config-router)\#area 1 stub//在R2上将区域1配置为STUB

三、 实验调试：

1． 重新查看R2上路由表信息

R2(config-router)\#do sh ip rout

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

34.0.0.0/24 is subnetted, 1 subnets

O IA 34.0.0.0 \[110/128\] via 23.0.0.3, 00:02:54, Serial2/2

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 \[110/65\] via 12.0.0.1, 00:02:54, Serial2/1

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

3.0.0.0/32 is subnetted, 1 subnets

O 3.3.3.3 \[110/65\] via 23.0.0.3, 00:03:09, Serial2/2

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 \[110/129\] via 23.0.0.3, 00:02:54, Serial2/2

23.0.0.0/24 is subnetted, 1 subnets

C 23.0.0.0 is directly connected, Serial2/2

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

2． 查看R1上的路由表变化：

R1(config-router)\#do sh ip rou

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 12.0.0.2 to network 0.0.0.0

34.0.0.0/24 is subnetted, 1 subnets

O IA 34.0.0.0 \[110/192\] via 12.0.0.2, 00:04:08, Serial2/1

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

O IA 2.2.2.2 \[110/65\] via 12.0.0.2, 00:04:08, Serial2/1

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 \[110/129\] via 12.0.0.2, 00:04:08, Serial2/1

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 \[110/193\] via 12.0.0.2, 00:04:08, Serial2/1

23.0.0.0/24 is subnetted, 1 subnets

O IA 23.0.0.0 \[110/128\] via 12.0.0.2, 00:04:08, Serial2/1

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

**O\*IA 0.0.0.0/0 \[110/65\] via 12.0.0.2, 00:04:09, Serial2/1**

以上输出结果表明，R1增加了一条默认路由，指向R2的S2/1接口，如果在区域0或者1重发布其它路由信息，R1上也只会有这条默认路由。

3． 验证，在R4上重发布直连路由，在R1上查看路由表

//在R4上重建两条直连路由，并重分布到OSPF路由内

R4(config-if)\#int lo 1

R4(config-if)\#ip add 192.168.1.1 255.255.255.0

R4(config-if)\#int lo 2

R4(config-if)\#ip add 192.168.2.1 255.255.255.0

R4(config-if)\#router os 1

R4(config-router)\#redistribute connected subnets

//在R1上继续查看路由表

R1(config-router)\#do sh ip rout

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 12.0.0.2 to network 0.0.0.0

34.0.0.0/24 is subnetted, 1 subnets

O IA 34.0.0.0 \[110/192\] via 12.0.0.2, 00:11:55, Serial2/1

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

O IA 2.2.2.2 \[110/65\] via 12.0.0.2, 00:11:55, Serial2/1

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 \[110/129\] via 12.0.0.2, 00:11:55, Serial2/1

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 \[110/193\] via 12.0.0.2, 00:11:55, Serial2/1

23.0.0.0/24 is subnetted, 1 subnets

O IA 23.0.0.0 \[110/128\] via 12.0.0.2, 00:11:55, Serial2/1

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

O\*IA 0.0.0.0/0 \[110/65\] via 12.0.0.2, 00:11:55, Serial2/1

以上结果表明，STUB区域过滤外部路由信息，并自动添加一条默认路由用于路由到远程网络。

转载于:https://blog.51cto.com/kalng/888501

[185949386.jpg]: https://s1.51cto.com/attachment/201206/185949386.jpg

OSPF stub

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