实验27: default-information originate
1.
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。
2.
实验拓扑
本实验的拓扑结构如图所示。
3.
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
C
1.1.1
.0 is directly connected, Loopback1
O
2.2.2
.2 [110/65] via 172.16.1.2, 00:11:22, Serial0/1
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
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
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
O
1.1.1
.1 [110/65] via 172.16.1.1, 00:14:57, Serial0/0
C
2.2.2
.0 is directly connected, Loopback1
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
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
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
