One 、 The experimental requirements and topology are shown in the figure below ：

Two 、 planning ip

R1-R4 Each device has two loops 6 Net segment
4×2＋6＝14
take 4 The two loops of a router are first viewed as one and then divided 2 Net segment , take 6 A network segment belongs to a backbone network segment and is regarded as a , So it's going to take 4+1=5 Net segment
192.168.1.0/24

128 64 32 16 8 4 2 1
192.168.1.0000 0000 192.168.1.0/27 Backbone network segment
192.168.1.0010 0000 192.168.1.32/27 R1 Loopback
192.168.1.0100 0000 192.168.1.64/27 R2 Loopback
192.168.1.0110 0000 192.168.1.96/27 R3 Loopback
192.168.1.1000 0000 192.168.1.128/27 R4 Loopback
192.168.1.1010 0000
192.168.1.1100 0000
192.168.1.1110 0000

① Divide the backbone network segment into 6 individual
192.168.1.0/27 Backbone network segment

192.168.1.000 00000

128 64 32 16 8 4 2 1
192.168.1.000 000 00 192.168.1.0/30
192.168.1.000 001 00 192.168.1.4/30
192.168.1.000 010 00 192.168.1.8/30
192.168.1.000 011 00 192.168.1.12/30
192.168.1.000 100 00 192.168.1.16/30
192.168.1.000 101 00 192.168.1.20/30
192.168.1.000 110 00
192.168.1.000 111 00
② Separately r1-r4 It is divided into two network segments
192.168.1.32/27 R1 Loopback
192.168.1.001 00000
192.168.1.001 00000 192.168.1.32/28
192.168.1.001 10000 192.168.1.48/28

192.168.1.64/27 R2 Loopback
192.168.1.010 00000
192.168.1.010 00000 192.168.1.64/28
192.168.1.010 10000 192.168.1.80/28

192.168.1.96/27 R3 Loopback
192.168.1.011 00000
192.168.1.011 00000 192.168.1.96/28
192.168.1.011 10000 192.168.1.112/28

192.168.1.128/27 R4 Loopback
192.168.1.100 00000
192.168.1.100 00000 192.168.1.128/28
192.168.1.100 10000 192.168.1.144/28

3、 ... and 、 The first two have been met ：

3 R1-R4 You can't write directly to 5.5.5.0/24 Static routing of , But there's still access to

To assume that r5 The loopback and 100m interface of does not exist , Configure others ：

Configure routing table

here ,r1pingr5

To configure r1-r4 Default ：

r4 default ：

r2 default ：

r3 default ：

r1 default ：

ping 5.5.5.5

next：

r1 ping r5 Hundred trillion

Four 、 Change priority

ip route-static 192.168.1.0 255.255.255.252 192.168.1.13 p 61
ip route-static 192.168.1.4 255.255.255.252 192.168.1.13 p 61
ip route-static 192.168.1.16 255.255.255.252 192.168.1.13 p 61
ip route-static 192.168.1.20 255.255.255.252 192.168.1.13 p 61
ip route-static 192.168.1.32 255.255.255.224 192.168.1.13 p 61
ip route-static 192.168.1.64 255.255.255.224 192.168.1.13 p 61
ip route-static 192.168.1.96 255.255.255.224 192.168.1.13 p 61
ip route-static 192.168.1.128 255.255.255.224 192.168.1.13 p 61

5、 ... and 、 Each router is equipped with an empty interface , Guard ring