Issue Description
After Ethernet of AR28-09B is divided into sub-interface, IP address cannot be configured on sub-interface.
Alarm Information
Configure IP address and it indicatesIncorrect command.
Handling Process
After dividing sub-interface, first configure vlan-type dot1q vid XX and then IP address.
Root Cause
For mid-low end router of VRP1.74 version, if it is required to configure IP address on sub-interface, first encapsulate VLAN on sub-interface.
