如图所示，需求如下：
1、所有交换机互联端口均为trunk口，并允许所有VLAN通过 2、客户端需要从dhcp服务器获取地址，但网关不在dhcp服务器上，网关在右侧交换机，dhcp服务器交换机只有一个管理地址110.189.70.11 3、模拟客户端交换机启用SVI接口VLAN 110，并且配置地址时允许自动获取 DHCP服务器配置：
interface Vlan-interface70
ip address 10.189.70.11 255.255.255.0
#
dhcp enable
vlan 70
vlan 110
#
dhcp server ip-pool vlan110
gateway-list 10.189.74.1
network 10.189.74.0 mask 255.255.254.0
#
interface GigabitEthernet1/0/1
真空海绵吸盘port link-mode bridge
port link-type trunk
port trunk permit vlan all
#
interface GigabitEthernet1/0/2
port link-mode bridge
port link-type trunk
port trunk permit vlan all
网关中继配置：
heffSystem-view
#
低频声波吹灰器
dhcp enable
#
vlan 70
#
vlan 110
#
interface Vlan-interface70
ip address 10.189.70.1 255.255.255.0
#
网络对时interface Vlan-interface110
ip address 10.189.74.1 255.255.254.0
dhcp select relay
dhcp relay server-address 10.189.70.11
#
interface GigabitEthernet1/0/1
port link-mode bridge
port link-type trunk热轧酸洗
port trunk permit vlan all
客户端配置:
System-view
#
#
vlan 110
#
interface Vlan-interface110
ip address dhcp-alloc
#
interface GigabitEthernet1/0/1
port link-mode bridge
port link-type trunk
port trunk permit vlan all
#
验证配置
[SW3]display ip int brief
Vlan110 up up 10.189.74.2 --
#
[SW3]display dhcp client verbose
Vlan-interface110 DHCP client information:
Current state: BOUND
Allocated IP: 10.189.74.2 255.255.254.0
Allocated lease: 86400 seconds, T1: 40460 seconds, T2: 75600 seconds
Lease from Aug 17 09:44:08 2022 to Aug 18 09:44:08 2022
DHCP server: 10.189.70.11
Transaction ID: 0x10261807
Default router: 10.189.74.1
Client ID type: ascii(type value=00)
铜管焊接 Client ID value: 60dd.c839.0302-Vlan110
Client ID (with type) hex: 0036-3064-642e-6338-
3339-2e30-3330-322d-
566c-616e-3131-30
T1 will timeout in 0 days 10 hours 47 minutes 56 seconds
