一、实验拓扑
二、实验需求
1、全网可达
2、使用DHCP获取IP地址
三、实验思路
1、划分地址、进行地址配置
2、vlan配置：
划分vlan；
更改接口的链路类型，将相应的接口加入vlan；
在trunk链路上放行网络中的vlan
3、配置子接口
4、DHCP配置
四、实验步骤
1、创建vlan
SW1\]vlan 2 \[SW1-vlan2\]vlan 3 \[SW2\]vlan 2 \[SW2-vlan2\]vlan 3 \[SW3\]vlan 2 \[SW3-vlan2\]vlan 3 2、接口加入相应vlan，配置trunk链路，精确放行相应VLAN \[SW1\]int e0/0/2 \[SW1-Ethernet0/0/2\]port link-type access \[SW1-Ethernet0/0/2\]port default vlan 2 \[SW1-Ethernet0/0/2\]int e0/0/3 \[SW1-Ethernet0/0/3\]port link-type access \[SW1-Ethernet0/0/3\]port default vlan 3 \[SW1-Ethernet0/0/3\]int e0/0/1 \[SW1-Ethernet0/0/1\]port link-type trunk \[SW1-Ethernet0/0/1\]port trunk allow-pass vlan 2 3 \[SW2\]int e0/0/3 \[SW2-Ethernet0/0/3\]port link-type access \[SW2-Ethernet0/0/3\]port default vlan 2 \[SW2-Ethernet0/0/3\]int e0/0/4 \[SW2-Ethernet0/0/4\]port link-type access \[SW2-Ethernet0/0/4\]port default vlan 3 \[SW2-Ethernet0/0/4\]int e0/0/2 \[SW2-Ethernet0/0/2\]port link-type trunk \[SW2-Ethernet0/0/2\]port trunk allow-pass vlan 2 3 \[SW2\]int e0/0/1 \[SW2-Ethernet0/0/1\]port link-type trunk \[SW2-Ethernet0/0/1\]port trunk allow-pass vlan 2 3 \[SW3\]int e0/0/2 \[SW3-Ethernet0/0/2\]port link-type access \[SW3-Ethernet0/0/2\]port default vlan 2 \[SW3-Ethernet0/0/2\]int e0/0/3 \[SW3-Ethernet0/0/3\]port link-type access \[SW3-Ethernet0/0/3\]port default vlan 3 \[SW3-Ethernet0/0/3\]int e0/0/1 \[SW3-Ethernet0/0/1\]port link-type trunk \[SW3-Ethernet0/0/1\]port trunk allow-pass vlan 2 3    3、在路由器上配置路由信息或者子接口信息，实现全网通 \[R1\]int g0/0/0.2 \[R1-GigabitEthernet0/0/0.2\]ip a 192.168.1.254 24 \[R1-GigabitEthernet0/0/0.2\]dot1q termination vid 2 \[R1-GigabitEthernet0/0/0.2\]arp broadcast enable \[R1\]int g0/0/0.3 \[R1-GigabitEthernet0/0/0.3\]ip a 192.168.2.254 24 \[R1-GigabitEthernet0/0/0.3\]dot1q termination vid 3 \[R1-GigabitEthernet0/0/0.3\]arp broadcast enable \[R1\]int g0/0/1.2 \[R1-GigabitEthernet0/0/1.2\]ip a 192.168.3.254 24 \[R1-GigabitEthernet0/0/1.2\]dot1q termination vid 2 \[R1-GigabitEthernet0/0/1.2\]arp broadcast enable \[R1\]int g0/0/1.3 \[R1-GigabitEthernet0/0/1.3\]ip a 192.168.4.254 24 \[R1-GigabitEthernet0/0/1.3\]dot1q termination vid 3 \[R1-GigabitEthernet0/0/1.3\]arp broadcast enable  4、DHCP配置 \[R1\]dhcp enable \[R1\]ip pool aa \[R1-ip-pool-aa\]net 192.168.1.0 mask 24 \[R1-ip-pool-aa\]gateway-list 192.168.1.254 \[R1-ip-pool-aa\]dns-list 114.114.114.114 8.8.8.8 \[R1\]int g0/0/0.2 \[R1-GigabitEthernet0/0/0.2\]dhcp select global \[R1\]ip pool bb \[R1-ip-pool-bb\]net 192.168.2.0 mask 24 \[R1-ip-pool-bb\]gateway-list 192.168.2.254 \[R1-ip-pool-bb\]dns-list 114.114.114.114 8.8.8.8 \[R1\]int g0/0/0.3 \[R1-GigabitEthernet0/0/0.3\]dhcp select global \[R1\]ip pool cc \[R1-ip-pool-cc\]net 192.168.3.0 mask 24 \[R1-ip-pool-cc\]gateway-list 192.168.3.254 \[R1-ip-pool-cc\]dns-list 114.114.114.114 8.8.8.8 \[R1\]int g0/0/1.2 \[R1-GigabitEthernet0/0/1.2\]dhcp select global \[R1\]ip pool dd \[R1-ip-pool-dd\]net 192.168.4.0 mask 24 \[R1-ip-pool-dd\]gateway-list 192.168.4.254 \[R1-ip-pool-dd\]dns-list 114.114.114.114 8.8.8.8 \[R1\]int g0/0/1.3 \[R1-GigabitEthernet0/0/1.3\]dhcp select global     实现全网通     