By default, the DHCP service is enabled using the dhcp select global command in the VLANIF interface view in S2700
V100R003 and disabled in V100R005. To ensure that V100R005 is compatible with earlier versions, the DHCP service is enabled in V100R005. If the global DHCP service enabled using the dhcp enable command is disabled, the related commands do not take effect. It is recommended that you delete these commands manually. If the global DHCP service is enabled, contact Huawei technical support engineers to delete related commands.