1、ENSP 添加三个AR220路由，分别命名为R1/R2/R3
R1地址分配：
G0/0/0 ip:1.0.0.1 掩码:255.0.0.0
G0/0/1 ip:2.0.0.1 掩码:255.0.0.0
R2地址分配：
G0/0/0 ip:1.0.0.2 掩码:255.0.0.0
G0/0/1 ip:2.0.0.2 掩码:255.0.0.0
R3地址分配：
G0/0/0 ip:3.0.0.1 掩码:255.0.0.0
G0/0/1 ip:4.0.0.1 掩码:255.0.0.0
PC1:3.0.0.2 255.0.0.0
PC2:4.0.0.2 255.0.0.0
2、R1配置命令：
SYS
SYS R1
int G0/0/0
ip add 1.0.0.1 255.0.0.0
ospf enable 1 area 0
int G0/0/1
ip add 2.0.0.1 255.0.0.0
ospf enable 1 area 0
q
int LoopBack0
ip add 1.1.1.1 255.255.255.255
ospf en 1 area 0
ospf 1 rou 1.1.1.1
area 0
net 1.0.0.0 0.0.0.255
net 2.0.0.0 0.0.0.255
q
R2配置命令：
SYS
SYS R2
int G0/0/0
ip add 1.0.0.2 255.0.0.0
ospf enable 1 area 0
int G0/0/1
ip add 3.0.0.1 255.0.0.0
ospf enable 1 area 0
q
int LoopBack0
ip add 2.2.2.2 255.255.255.255
ospf en 1 area 0
ospf 1 rou 2.2.2.2
area 0
net 1.0.0.0 0.0.0.255
net 3.0.0.0 0.0.0.255
q
R3路由配置命令：
SYS
SYS R3
int G0/0/0
ip add 2.0.0.2 255.0.0.0
ospf enable 1 area 0
int G0/0/1
ip add 4.0.0.1 255.0.0.0
ospf enable 1 area 0
q
int LoopBack0
ip add 3.3.3.3 255.255.255.255
ospf en 1 area 0
ospf 1 rou 3.3.3.3
area 0
net 2.0.0.0 0.0.0.255
net 4.0.0.0 0.0.0.255
q
3、查看OSPF DR/BDR已经出现了
4、查看OSPF 路由表
命令：dis ospf ro
5、PC测试PING成功
