NA-NP-IE系列实验27: default-information originate-白红宇

实验27: default-information originate

实验目的

通过本实验可以掌握如何通过命令“default-information originate”向OSPF 网络

注入一条默认路由。

注：本实验用R0的环回接口1 来模拟Internet。

实验拓扑

本实验的拓扑结构如图所示。

实验步骤

配置如下：

r0(config)#no ip do loo

r0(config)#lin c 0

r0(config-line)#logg s

r0(config-line)#exec-t 00

r0(config-line)#exit

r0(config)#int loo 1

r0(config-if)#

*Mar 1 00:02:45.631: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

r0(config-if)#ip add 1.1.1.1 255.255.255.0

r0(config-if)#int s0/1

*Mar 1 00:03:20.375: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

*Mar 1 00:03:21.375: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r0(config-if)#int s0/1

r0(config-if)#ip add 172.16.1.1 255.255.255.0

r0(config-if)#no sh

r0(config-if)#

*Mar 1 00:03:38.475: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

*Mar 1 00:03:39.475: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up

r0(config-if)#

*Mar 1 00:03:49.279: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down

r0(config-if)#

*Mar 1 00:04:12.623: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down

r0(config-if)#

*Mar 1 00:05:52.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up

r0(config-if)#exit

r0(config)#ip route 0.0.0.0 0.0.0.0 loo 1

r0(config)#router ospf 1

r0(config-router)#net 1.1.1.0 0.0.0.255 area 0

r0(config-router)#net 172.16.119.0 0.0.0.255 area 0

r0(config-router)#net 172.16.1.0 0.0.0.255 area 0

r0(config-router)#ex

*Mar 1 00:08:03.623: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0/1 from LOADING to FULL, Loading Done

r0(config-router)#default-in

r0(config-router)#default-information ori

r0(config-router)#default-information originate

r0(config-router)#do ping 172.16.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 32/49/88 ms

r0(config-router)#do ping 3.3.3.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 48/76/120 ms

r0(config)#do sh 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

Gateway of last resort is 0.0.0.0 to network 0.0.0.0

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback1

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/65] via 172.16.1.2, 00:11:22, Serial0/1

3.0.0.0/32 is subnetted, 1 subnets

O 3.3.3.3 [110/129] via 172.16.1.2, 00:11:22, Serial0/1

172.16.0.0/24 is subnetted, 2 subnets

C 172.16.1.0 is directly connected, Serial0/1

O 172.16.2.0 [110/128] via 172.16.1.2, 00:11:22, Serial0/1

S* 0.0.0.0/0 is directly connected, Loopback1

r0(config)#do sh ip ospf da

OSPF Router with ID (1.1.1.1) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

1.1.1.1 1.1.1.1 789 0x80000003 0x00EE10 3

2.2.2.2 2.2.2.2 804 0x80000004 0x0015B8 5

3.3.3.3 3.3.3.3 894 0x80000003 0x008560 3

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

0.0.0.0 1.1.1.1 108 0x80000001 0x001D91 1

r1(config)#int loo 1

r1(config-if)#ip add 2.2..2

*Mar 1 00:05:23.583: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

r1(config-if)#ip add 2.2.2.2 255.255.255.0

r1(config-if)#int s0/0

r1(config-if)#ip add 172.16.1.2 255.255.255.0

r1(config-if)#no sh

r1(config-if)#exit

r1(config)#int s0/

*Mar 1 00:05:48.995: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

*Mar 1 00:05:49.995: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r1(config)#int s0/1

r1(config-if)#ip add 172.16.2.1 255.255.255.0

r1(config-if)#no sh

r1(config-if)#exit

r1(config)#router ospf 1

r1(config-router)#net 172.16.1.0 0.0.0.255 area 0

r1(config-router)#net 172.16.2.0 0.0.0.255 area 0

r1(config-router)#

*Mar 1 00:06:33.831: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on Serial0/1 from LOADING to FULL, Loading Done

r1(config-router)#net 2.2.2.0 0.0.0.255 area 0

r1(config-router)#exit

r1(config)#ip

*Mar 1 00:08:03.291: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/0 from LOADING to FULL, Loading Done

r1(config)#do sh 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

Gateway of last resort is 172.16.1.1 to network 0.0.0.0

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/65] via 172.16.1.1, 00:14:57, Serial0/0

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback1

3.0.0.0/32 is subnetted, 1 subnets

O 3.3.3.3 [110/65] via 172.16.2.2, 00:14:57, Serial0/1

172.16.0.0/24 is subnetted, 2 subnets

C 172.16.1.0 is directly connected, Serial0/0

C 172.16.2.0 is directly connected, Serial0/1

O*E2 0.0.0.0/0 [110/1] via 172.16.1.1, 00:03:41, Serial0/0

从上面R0 的路由表的输出，可以看到通过命令“default-information originate”

确实可以向OSPF 区域注入一条默认路由。

O*E2 0.0.0.0/0 [110/1] via 172.16.1.1, 00:03:41, Serial0/0

r1(config)#do sh ip ospf da

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

1.1.1.1 1.1.1.1 945 0x80000003 0x00EE10 3

2.2.2.2 2.2.2.2 959 0x80000004 0x0015B8 5

3.3.3.3 3.3.3.3 1050 0x80000003 0x008560 3

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

0.0.0.0 1.1.1.1 264 0x80000001 0x001D91 1

通过查看R4 的拓扑结构数据库可以看到，确实从外面注入了一条类型5 的LSA

r2(config)#int loo 1

r2(config-if)#ip add

*Mar 1 00:01:53.915: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

r2(config-if)#ip add 3.3.3.3 255.255.255.0

r2(config-if)#int s0/0

r2(config-if)#ip add 172.16.2.2 255.255.255.0

r2(config-if)#no sh

r2(config-if)#

*Mar 1 00:02:17.255: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

*Mar 1 00:02:18.255: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r2(config-if)#exit

r2(config)#router ospf 1

r2(config-router)#net 3.3.3.0 0.0.0.255

% Incomplete command.

r2(config-router)#net 3.3.3.0 0.0.0.255 area 0

r2(config-router)#net 172.16.2.0 0.0.0.255 area 0

r2(config-router)#

*Mar 1 00:06:33.459: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0/0 from LOADING to FULL, Loading Done

r2(config-router)#

本文转自gauyanm 51CTO博客，原文链接：http://blog.51cto.com/gauyanm/237883，如需转载请自行联系原作者