拓扑图：

 PC端

PC1>ipconfig

PC2>ipconfig

PC3>ipconfig

 PC4>ipconfig

PC>ping

PC1>ping 192.168.1.125

PC1>ping 192.168.1.254

PC1>ping 192.168.1.253

 PC2>ping 192.168.1.125

PC2>ping 192.168.1.253

PC3>ping 192.168.1.126

PC3>ping 192.168.1.254

PC4>ping 192.168.1.126

LSW1

[LSW1-GigabitEthernet0/0/1]display this 

[LSW1-GigabitEthernet0/0/2]display this 

[LSW1-GigabitEthernet0/0/3]display this 

[LSW1-GigabitEthernet0/0/4]display this 

LSW2

[LSW2-GigabitEthernet0/0/1]display this 

[LSW2-GigabitEthernet0/0/2]display this 

[LSW2-GigabitEthernet0/0/3]display this 

AR1

[AR1]display ip routing-table 

[AR1]display ip interface brief 

[AR1-GigabitEthernet0/0/0.1]display this 

[AR1-GigabitEthernet0/0/0.2]display this