1. 拓扑结构

2. 技术分析

• 引入外部路由的路由器不会改变本身路由表（解析：r2不会由于将192.168.4.0引入到ospf中，就改变自身的路由表，自身学习192.168.4.0还是通过rip），​只对引入路由器有效​

• 跟A有关的所有路由会引入进B

     包括两个部分：第一自身直连的接口，会引入B中；第二，A区域从外部引入的一会添加到B中

3. 实现配置

​R1:​

display current-configuration
[V200R003C00]

sysname r1

snmp-agent local-engineid 800007DB03000000000000
snmp-agent

clock timezone China-Standard-Time minus 08:00:00

portal local-server load portalpage.zip

drop illegal-mac alarm

set cpu-usage threshold 80 restore 75

aaa
authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user admin password cipher %$%$K8m.Nt84DZ}e#<0`8bmE3Uw}%$%$
local-user admin service-type http

firewall zone Local
priority 15

interface GigabitEthernet0/0/0
ip address 192.168.1.2 255.255.255.0

interface GigabitEthernet0/0/1

interface GigabitEthernet0/0/2

interface NULL0

interface LoopBack0
ip address 192.168.4.1 255.255.255.0

ospf 1 router-id 1.1.1.1
area 0.0.0.0
network 192.168.1.0 0.0.0.255
network 192.168.4.0 0.0.0.255

user-interface con 0
authentication-mode password
user-interface vty 0 4
user-interface vty 16 20

wlan ac

return
<r1>

​R2：​

display current-configuration
[V200R003C00]

sysname r2

snmp-agent local-engineid 800007DB03000000000000
snmp-agent

clock timezone China-Standard-Time minus 08:00:00

portal local-server load portalpage.zip

drop illegal-mac alarm

set cpu-usage threshold 80 restore 75

aaa
authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user admin password cipher %$%$K8m.Nt84DZ}e#<0`8bmE3Uw}%$%$
local-user admin service-type http

firewall zone Local
priority 15

interface GigabitEthernet0/0/0
ip address 192.168.1.1 255.255.255.0

interface GigabitEthernet0/0/1
ip address 192.168.2.1 255.255.255.0

interface GigabitEthernet0/0/2

interface NULL0

​ospf 1 router-id 2.2.2.2

​ import-route rip 1

​area 0.0.0.0

​ network 192.168.1.0 0.0.0.255 ​

​rip 1

​version 2

​ network 192.168.2.0

​import-route ospf 1​

user-interface con 0
authentication-mode password
user-interface vty 0 4
user-interface vty 16 20

wlan ac

return
<r2>

​R3：​

display current-configuration
[V200R003C00]

sysname r3

snmp-agent local-engineid 800007DB03000000000000
snmp-agent

clock timezone China-Standard-Time minus 08:00:00

portal local-server load portalpage.zip

drop illegal-mac alarm

set cpu-usage threshold 80 restore 75

aaa
authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user admin password cipher %$%$K8m.Nt84DZ}e#<0`8bmE3Uw}%$%$
local-user admin service-type http

firewall zone Local
priority 15

interface GigabitEthernet0/0/0
ip address 192.168.2.2 255.255.255.0

interface GigabitEthernet0/0/1

interface GigabitEthernet0/0/2

interface NULL0

interface LoopBack0
ip address 192.168.3.1 255.255.255.0

rip 1
version 2
network 192.168.3.0
network 192.168.2.0

user-interface con 0
authentication-mode password
user-interface vty 0 4
user-interface vty 16 20

wlan ac

return
<r3>

​注意：需要多练习，才会理解​