Metro1000 ET1 board supports VLAN, the operation route of Ethernet port data is determined by port number + VLAN number.The port data type: when the packet going through the port includes VLANID, it is called the TAG port, and is called the UNTAG port when it does not includes VLANID. ET1 ports include Ethernet physical port and MP channel port, when one is UNTAG type, we will designate a default VLANID to this port. When one port is of TAG type, it transmits data according to packet VLAN ID. If there? no VLAN ID identifier in the incoming packet, the port will discard this packet.