实验案例：在华为ensp软件上做DHCP中继实验
实验环境
如图所示，在win10下使用华为ensp软件上进行模拟实验
需求描述
通过模拟环境配置DHCP中继，使得各pc可以互相通信；
推荐步骤
新建一个拓扑图如下所示，
手动配置五台pc使用DHCP服务（自动分配ip地址）
对交换机各接口进行配置，
配置路由器各vlan虚拟网关
配置r2和r3的DHCP中继线路
各个pc配置DHCP请求ip地址
抓包观察并使得全网互通
具体如下：这里的ip地址以及vlan划分已经标识在拓扑图里了
1、配置sw1各接口类型已所属vla
sys
[Huawei]sysname sw1
[sw1]int e0/0/1
[sw1-Ethernet0/0/1]p l a
[sw1-Ethernet0/0/1]p d v 10
[sw1-Ethernet0/0/1]un sh
[sw1]int e0/0/2
[sw1-Ethernet0/0/2]p l a
[sw1-Ethernet0/0/2]p d v 20
[sw1-Ethernet0/0/2]un sh
[sw1]int e0/0/2
[sw1]int e0/0/3
[sw1-Ethernet0/0/3]p l a
[sw1-Ethernet0/0/3]p d v 10
[sw1-Ethernet0/0/3]un sh
[sw1]int e0/0/4
[sw1-Ethernet0/0/4]p l a
[sw1-Ethernet0/0/4]p d v 20
[sw1-Ethernet0/0/4]un sh
[sw1]int g0/0/1
[sw1-GigabitEthernet0/0/1]p l t
[sw1-GigabitEthernet0/0/1]p t a v 10 20
[sw1-GigabitEthernet0/0/1]un sh
2、配置r2各逻辑接口的ip地址，设置DHCP中继线路，
[Huawei]sysname r2
[r2]dhcp enable
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 12.0.0.1 24
[r2]int g0/0/1.10
[r2-GigabitEthernet0/0/1.10]ip add 192.168.10.1 24
[r2-GigabitEthernet0/0/1.10]d t v
[r2-GigabitEthernet0/0/1.10]a b e
[r2-GigabitEthernet0/0/1.10]dhcp select relay
[r2-GigabitEthernet0/0/1.10]dhcp relay server-ip 14.0.0.2
[r2]int g0/0/2
[r2-GigabitEthernet0/0/2]ip add 14.0.0.1 24
3.配置r4各接口ip地址，设置不同vlan所对应的网段，子网掩码网关以及dns，设置分配地址的范围，绑定pc5为固定ip地址
[Huawei]sysname r4
[r4]dhcp enable
[r4]ip pool dhcp15.0.0.0
[r4-ip-pool-dhcp15.0.0.0]network 15.0.0.0 mask 24
[r4-ip-pool-dhcp15.0.0.0]gateway-list 15.0.0.1
[r4-ip-pool-dhcp15.0.0.0]dns-list 8.8.8.8 2.2.2.2
[r4-ip-pool-dhcp15.0.0.0]excluded-ip-address 15.0.0.100 15.0.0.254
[r4-ip-pool-dhcp15.0.0.0]static-bind ip-address 15.0.0.88 mac-address 5489-98CB-210B
[r4]ip pool dhcpvlan10
[r4-ip-pool-dhcpvlan10]network 192.168.10.0 mask 24
[r4-ip-pool-dhcpvlan10]gateway-list 192.168.10.1
[r4-ip-pool-dhcpvlan10]dns-list 8.8.8.8 2.2.2.2
[r4]ip pool dhcpvlan20
[r4-ip-pool-dhcpvlan20]network 192.168.20.0 mask 24
[r4-ip-pool-dhcpvlan20]gateway-list 192.168.20.1
[r4-ip-pool-dhcpvlan20]dns-list 8.8.8.8 2.2.2.2
[r4-ip-pool-dhcpvlan20]int g0/0/0
[r4-GigabitEthernet0/0/0]dhcp select global
4、配置r3的接口ip地地址，设置DHCP的中继线路。
[Huawei]sysname r3
[r3]dhcp enable
[r3]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 15.0.0.1 24
[r3-GigabitEthernet0/0/1]dhcp select relay
[r3-GigabitEthernet0/0/1]dhcp relay server-ip 14.0.0.2
[r3-GigabitEthernet0/0/0]ip add 12.0.0.2 24
5.r4、r2设置为默认路由，r3配置静态路由
[r4]ip route-static 0.0.0.0 0.0.0.0 14.0.0.1
[r3]ip route-static 192.168.10.0 24 12.0.0.1
[r3]ip route-static 192.168.20.0 24 12.0.0.1
[r3]ip route-static 14.0.0.0 24 12.0.0.1
[r2]ip route-static 0.0.0.0 0.0.0.0 12.0.0.2
6.获取动态ip地址，并与其他pc互通
