诊断项目:[DHCP服务是否使能]
可能涉及的指令:
    show version slots
    show run | include service dhcp
!
!
诊断项目:[DHCP地址池是否正常]
可能涉及的指令:
    show run | include ip dhcp pool
    show run | begin ip dhcp pool <DHCP_POOL_NAME>
    show run | in ip dhcp excluded-address
    show dhcp pool <DHCP_POOL_NAME>
    show dhcp-server pool
    show ip dhcp pool
!
!
诊断项目:[与服务器是否能正常通信]
可能涉及的指令:
    show run | include ip helper-address
    ping <ARG>
!
!
诊断项目:[是否正确配置DHCP SNOOPING]
可能涉及的指令:
    show run | include dhcp snooping
    show ip interface brief
    show running-config interface <INTERFACE_NAME>
!
!
诊断项目:[检测用户接入端口是否正确]
可能涉及的指令:
    show mac-address-table address <MAC>
    show ip interface brief | in VLAN
    show vlan id <VLAN_ID_GATEWAY>
