核心交换机完成不同Vlan的DHCP地址分配
1、在核心交换机上需要有三种配置：
1、Vlan划分、Vlan接口的IP地址配置及每个Vlan接口应用DHCP地址池;
2、配置DHCP地址池，开启DHCP服务。
3、去往路由器设定Trunk接口，设定Vlan去路由器的默认静态路由
2、Vlan划分、Vlan接口的IP地址配置及每个Vlan接口应用DHCP地址池;
--------------------------------------------------------------------------------
划分Vlan:
<H3C>system-view
System View: return to User View with Ctrl+Z.
[H3C-GigabitEthernet1/0/1]vlan 2
[H3C-vlan2]vlan 3
[H3C-vlan3]quit
[H3C]interface GigabitEthernet 1/0/1
[H3C-GigabitEthernet1/0/1]port access vlan 2
[H3C]interface GigabitEthernet 1/0/3
[H3C-GigabitEthernet1/0/3]port access vlan 3
[H3C-GigabitEthernet1/0/3]quit
Vlan接口的IP地址配置：
[H3C]interface Vlan-interface 2
[H3C-Vlan-interface2]ip address 192.168.2.254 24
[H3C-Vlan-interface2]quit
[H3C]interface Vlan-interface 3
[H3C-Vlan-interface3]ip address 192.168.3.254 24
[H3C-Vlan-interface3]quit
每个Vlan接口应用DHCP地址池：
[H3C]interface Vlan-interface 2
[H3C-Vlan-interface2]dhcp select server
[H3C-Vlan-interface2]dhcp server apply ip-pool vlan2
[H3C-Vlan-interface2]quit
[H3C]interface Vlan-interface 3
[H3C-Vlan-interface3]dhcp select server
[H3C-Vlan-interface3]dhcp server apply ip-pool vlan3
[H3C-Vlan-interface3]quit
3、配置DHCP地址池，开启DHCP服务。
--------------------------------------------------------------------------------
[H3C]dhcp server ip-pool vlan2
[H3C-dhcp-pool-vlan2]network 192.168.2.0 mask 255.255.255.0
[H3C-dhcp-pool-vlan2]gateway-list 192.168.2.254
[H3C-dhcp-pool-vlan2]dns-list 202.102.128.68
[H3C-dhcp-pool-vlan2]quit
[H3C]
[H3C]dhcp server ip-pool vlan3
[H3C-dhcp-pool-vlan3]network 192.168.3.0 mask 255.255.255.0
[H3C-dhcp-pool-vlan3]gateway-list 192.168.3.254
[H3C-dhcp-pool-vlan3]dns-list 202.102.128.68
[H3C-dhcp-pool-vlan3]quit
[H3C]
[H3C]dhcp enable
4、去往路由器设定Trunk接口，设定Vlan包去路由器的默认静态路由
--------------------------------------------------------------------------------
去往路由器设定Trunk接口
[H3C]interface GigabitEthernet 1/0/2
[H3C-GigabitEthernet1/0/2]port link-type trunk
[H3C-GigabitEthernet1/0/2]port trunk permit vlan 2 3
[H3C-GigabitEthernet1/0/2]quit
[H3C]
设定Vlan包去路由器的默认静态路由
[H3C]ip route-static 0.0.0.0 0.0.0.0 192.168.2.253
[H3C]ip route-static 0.0.0.0 0.0.0.0 192.168.3.253
192.168.2.253 和 192.168.3.253是路由器子接口的地址。
两条静态路由，没有设定优先级，优先级一样，故同时起作用。
5、在路由器上设定两种配置：
1、配置路由子接口的IP地址和每个子接口终结Vlan的VID。
2、开启环回口，模拟公网IP。
6、配置路由子接口的IP地址和每个子接口终结Vlan的VID。
--------------------------------------------------------------------------------
<H3C>system-view
System View: return to User View with Ctrl+Z.
[H3C]interface GigabitEthernet 0/1.2
[H3C-GigabitEthernet0/1.2]ip address 192.168.2.253 24
[H3C-GigabitEthernet0/1.2]vlan-type dot1q vid 2
[H3C-GigabitEthernet0/1.2]quit
[H3C]interface GigabitEthernet 0/1.3
[H3C-GigabitEthernet0/1.3]ip address 192.168.3.253 24
[H3C-GigabitEthernet0/1.3]vlan-type dot1q vid 3
[H3C-GigabitEthernet0/1.3]quit
7、开启环回口，模拟公网IP。
[H3C]interface LoopBack 0
[H3C-LoopBack0]ip address 202.102.128.68 32
8、在计算机上自动获取IP，并测试连通性
