1.组网拓扑图（交换机-PC）
2.MSR36-2-3是DHCP服务器，跨网段使PC自动获取 192.168.10.0（vlan10）网段地址
3、使用命令
MSR36-20-3开启DHCP功能
[R2]dhcp enable
[R2]dhcp server ip-pool 1
[R2-dhcp-pool-1]network 192.168.1.0 mask 255.255.255.0
[R2-dhcp-pool-1]gateway-list 192.168.1.254
[R2-dhcp-pool-1]dns-list 8.8.8.8
[R2-GigabitEthernet0/0]ip address 10.10.10.1 24（配置接口地址）
MSR36-20-1配置接口地址
[R1-GigabitEthernet0/1]ip address 10.10.10.2 24
[R1-GigabitEthernet0/0]ip address 192.168.1.254 24
MSR36-20-1配置DHCP功能，连接客户端的接口开启dhcp中继，指向DHCP服务器地址
[R1]dhcp enable
[R1-GigabitEthernet0/0]dhcp select relay
[R1-GigabitEthernet0/0]dhcp relay server-address 10.10.10.1
MSR36-20-3配置静态路由，让dhcp服务器可以访问PC
[R2]ip route-static 0.0.0.0 0.0.0.0 10.10.10.2
