实验对象：一台路由器、一台交换机、四台PC机

实验环境：eNSP

单臂路由实验命令： interface Ethernet0/0/0.10

                                 dot1q termination vid 10（该接口属于vlan10）

                                 ip add 192.168.10.1 24 

                                 arp broadcast enable（开启arp广播）

 实验要求：
            1.按照拓扑配置vlan和trunk，使各个vlan之间都能ping通

            2.在R2上基于接口口DHCP功能，让四台PC通过DHCP获取IP地址

            3.PC5-1保留192.168.40.250-254地址不分配

R2:
interface Ethernet0/0/0.10
 dot1q termination vid 10
 ip address 192.168.10.1 255.255.255.0
 arp broadcast enable
 dhcp select interface
 dhcp server dns-list 10.10.10.10 1.1.1.1

interface Ethernet0/0/0.20
 dot1q termination vid 20
 ip address 192.168.20.1 255.255.255.0
 arp broadcast enable
 dhcp select interface
 dhcp server dns-list 20.20.20.20 2.2.2.2

interface Ethernet0/0/0.30
 dot1q termination vid 30
 ip address 192.168.30.1 255.255.255.0
 arp broadcast enable
 dhcp select interface
 dhcp server dns-list 30.30.30.30 3.3.3.3

interface Ethernet0/0/0.40
 dot1q termination vid 40
 ip address 192.168.40.1 255.255.255.0
 arp broadcast enable
 dhcp select interface
 dhcp server excluded-ip-address 192.168.40.250 192.168.40.254
 dhcp server dns-list 40.40.40.40 4.4.4.4

LSW5-1:

interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094

interface GigabitEthernet0/0/2
 port link-type access
 port default vlan 10

interface GigabitEthernet0/0/3
 port link-type access
 port default vlan 40

interface GigabitEthernet0/0/4
 port link-type access
 port default vlan 20

interface GigabitEthernet0/0/5
 port link-type access
 port default vlan 30

R2:

LSW5-1:

PC机通过DHCP方式获取IP地址，测试PC之间的网络连通性PC4-1pingPC5-1

PC5-1 保留192.168.40.250-254地址不分配