要求：1.整个网络除R4的环回外，其他全部基于192.168.1.0/24划分所得。
2.R0--R3每台设备还存在两个环回接口。
3.R4的环回网段为1.1.1.0/24，全网可达。
拓扑图：
子网划分：
主干链路：
192.168.1.32/27
192.168.1.64/27
192.168.1.96/27
192.168.1.128/27
192.168.1.160/27
192.168.1.192/27
环回网段（192.168.1.0/27）：
192.168.1.0/30
192.168.1.4/30
192.168.1.8/30
192.168.1.12/30
192.168.1.16/30
192.168.1.20/30
192.168.1.24/30
192.168.1.28/30
合理规划：
| 路由器 | 接口 | 地址 |
| R0 | f0/0 | 192.168.1.1/27 |
| R0 | F0/1 | 192.168.1.161/27 |
| R0 | loopback0 | 192.168.1.1/30 |
| R0 | loopback1 | 192.168.1.5/30 |
| R1 | f0/0 | 192.168.1.2/27 |
| R1 | f0/1 | 192.168.1.33/27 |
| R1 | loopback0 | 192.168.1.9/30 |
| R1 | loopback1 | 192.168.1.13/30 |
| R2 | f0/0 | 192.168.1.162/27 |
| R2 | f0/1 | 192.168.1.129/27 |
| R2 | loopback0 | 192.168.1.17/30 |
| R2 | loopback1 | 192.168.1.21/30 |
| R3 | f0/0 | 192.168.1.34/27 |
| R3 | f0/1 | 192.168.1.130/27 |
| R3 | f1/0 | 192.168.1.65/27 |
| R3 | f1/1 | 192.168.1.97/27 |
| R3 | loopback0 | 192.168.1.25/30 |
| R3 | loopback1 | 192.168.1.29/30 |
| R4 | f0/0 | 192.168.1.66/27 |
| R4 | f0/1 | 192.168.1.98/27 |
| R4 | loopback0 | 10.1.1.1/24 |
配置：
1.R0
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
no ip address
!
interface Loopback1
no ip address
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.161 255.255.255.224
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.1.0 255.255.255.224 FastEthernet0/0
ip route 192.168.1.32 255.255.255.224 FastEthernet0/0
ip route 192.168.1.128 255.255.255.224 FastEthernet0/1
ip route 192.168.1.64 255.255.255.224 FastEthernet0/0
ip route 192.168.1.96 255.255.255.224 FastEthernet0/0
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
2.R1
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
no ip address
!
interface Loopback1
no ip address
!
interface FastEthernet0/0
ip address 192.168.1.2 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.33 255.255.255.224
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.1.160 255.255.255.224 FastEthernet0/0
ip route 192.168.1.64 255.255.255.224 FastEthernet0/1
ip route 192.168.1.96 255.255.255.224 FastEthernet0/1
ip route 192.168.1.128 255.255.255.224 FastEthernet0/1
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
3.R2
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
ip address 192.168.1.17 255.255.255.252
!
interface Loopback1
ip address 192.168.1.21 255.255.255.252
!
interface FastEthernet0/0
ip address 192.168.1.162 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.129 255.255.255.224
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
4.R3
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
ip address 192.168.1.25 255.255.255.252
!
interface Loopback1
ip address 192.168.1.29 255.255.255.252
!
interface FastEthernet0/0
ip address 192.168.1.34 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.130 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet1/0
ip address 192.168.1.65 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet1/1
ip address 192.168.1.97 255.255.255.224
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.1.0 255.255.255.224 FastEthernet0/0
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
5.R4
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.1.66 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.1.98 255.255.255.224
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.1.32 255.255.255.224 FastEthernet0/0
ip route 192.168.1.0 255.255.255.224 FastEthernet0/0
ip route 192.168.1.128 255.255.255.224 FastEthernet0/1
ip route 192.168.1.160 255.255.255.224 FastEthernet0/1
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end