【Problem Description】：can not get the ip automat4illy from the VLAN 20, need to support
【Problem Analysis】：confirm the version and the FC ,FA state
【Root Cause】：give the guide to config the gateway
【Solution Description】：1.can not get the ip automat4illy from the VLAN 20, need to support
2.give the guide to config the gateway
https://support.huawei.com/hedex/hdx.do?lib=EDOC1100010266YEH1114K&docid=EDOC1100010266&lang=en&v=06&tocLib=EDOC1100010266YEH1114K&tocV=06&id=EN-US_TOPIC_0077247846&tocURL=resources%252fen%252dus%255ftopic%255f0077247846%252ehtml&p=t&fe=1&ui=3&keyword=the&keyword=servic&keyword=configur&keyword=dhcp&text=%2525253Cb%2525253EConfiguring%2525253C%2525252Fb%2525253E%25252B%2525253Cb%2525253Ethe%2525253C%2525252Fb%2525253E%25252B%2525253Cb%2525253EDHCP%2525253C%2525252Fb%2525253E%25252B%2525253Cb%2525253EService%2525253C%2525252Fb%2525253E
