写出中间多层交换机的代码（分Vlan、设置不同vlan网关、设置DHCP IP池等等）：

以下是一个示例中间多层交换机的代码，包括分Vlan、设置不同vlan网关、设置DHCP IP池等等： // 创建 VLAN vlan 10 vlan 20 vlan 30 // 配置 VLAN 网关 interface vlan 10 ip address 192.168.10.1/24 no shutdown interface vlan 20 ip address 192.168.20.1/24 no shutdown interface vlan 30 ip address 192.168.30.1/24 no shutdown // 配置 DHCP IP 池 ip dhcp pool vlan10-pool network 192.168.10.0/24 default-router 192.168.10.1 dns-server 8.8.8.8 ip dhcp pool vlan20-pool network 192.168.20.0/24 default-router 192.168.20.1 dns-server 8.8.8.8 ip dhcp pool vlan30-pool network 192.168.30.0/24 default-router 192.168.30.1 dns-server 8.8.8.8 // 配置端口 VLAN interface gigabitethernet 1/0/1 switchport mode access switchport access vlan 10 interface gigabitethernet 1/0/2 switchport mode access switchport access vlan 20 interface gigabitethernet 1/0/3 switchport mode access switchport access vlan 30 // 配置端口连接其他交换机 interface gigabitethernet 1/0/4 switchport mode trunk switchport trunk allowed vlan 10,20,30 switchport trunk encapsulation dot1q // 保存配置 write memory