The experimental requirements ：

Lay out the following topology , And the whole network can reach

The configuration is as follows ：

R1：
Get into R1, Enter the corresponding interface configuration IP
[r1]int g 0/0/0
[r1-GigabitEthernet0/0/0]ip address 192.168.1.1 255.255.255.0
[r1]int g0/0/1
[r1-GigabitEthernet0/0/1]ip address 192.168.2.1 255.255.255.0
Then configure the corresponding static route
[r1]ip route-static 192.168.3.0 24 192.168.2.2
[r1]ip route-static 192.168.4.0 24 192.168.2.2
[r1]ip route-static 192.168.5.0 24 192.168.2.2

Other routers such as R1 The steps are the same

R2:
[r2]int g 0/0/0
[r2-GigabitEthernet0/0/0]ip address 192.168.3.1 255.255.255.0
[r2]int g 0/0/1
[r2-GigabitEthernet0/0/1]ip address 192.168.2.2 255.255.255.0
[r2]int g 0/0/2
[r2-GigabitEthernet0/0/2]ip address 192.168.4.1 255.255.255.0
Static routing
[r2]ip route-static 192.168.1.0 255.255.255.0 192.168.2.1
[r2]ip route-static 192.168.5.0 255.255.255.0 192.168.4.2

R3：
[r3]int g 0/0/0
[r3-GigabitEthernet0/0/0]ip address 192.168.5.1 255.255.255.0
[r3-GigabitEthernet0/0/0]int g 0/0/1
[r3-GigabitEthernet0/0/1]ip address 192.168.4.2 255.255.255.0
static state ：
[r3]ip route-static 192.168.1.0 255.255.255.0 192.168.4.1
[r3]ip route-static 192.168.2.0 255.255.255.0 192.168.4.1
[r3]ip route-static 192.168.3.0 255.255.255.0 192.168.4.1

PC1：

PC2：

PC3：

And then use PC1 Go separately pingPC2 and PC3:

Use PC2 Go to pingPC3