R1:
system-view
sysname r1
interface GigabitEthernet0/0/0
ip address 10.1.4.1 255.255.255.0
interface GigabitEthernet0/0/1
ip address 10.1.1.1 255.255.255.0
interface GigabitEthernet0/0/2
ip address 10.1.2.1 255.255.255.0
interface GigabitEthernet0/0/3
ip address 10.1.3.1 255.255.255.0
ospf 1 router-id 1.1.1.1
area 0.0.0.1
network 10.1.1.0 0.0.0.255
network 10.1.2.0 0.0.0.255
network 10.1.3.0 0.0.0.255
network 10.1.4.0 0.0.0.255
R2:
system-view
sysname r2
interface GigabitEthernet0/0/0
ip address 10.1.4.2 255.255.255.0
interface GigabitEthernet0/0/1
ip address 10.1.5.1 255.255.255.0
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 10.1.5.0 0.0.0.255
area 0.0.0.1
abr-summary 10.1.0.0 255.255.248.0
network 10.1.4.0 0.0.0.255
R3:
system-view
sysname r3
interface GigabitEthernet0/0/0
ip address 10.1.5.2 255.255.255.0
interface GigabitEthernet0/0/1
ip address 10.1.6.1 255.255.255.0
ospf 1 router-id 3.3.3.3
area 0.0.0.0
network 10.1.6.0 0.0.0.255
network 10.1.5.0 0.0.0.255
R4:
system-view
sysname r4
interface GigabitEthernet0/0/0
ip address 10.1.6.2 255.255.255.0
ospf 1 router-id 4.4.4.4
area 0.0.0.0
network 10.1.6.0 0.0.0.255
注意事项：区域间路由汇总，汇总的命令需要在ABR（AREA BORDER ROUTER）中进行配置
目的：减少路由数量
配置命令：
ospf 1
area 1
abr-summary 汇总的路由 子网掩码
