1) to clear VLAN ID Table,
2) to enable 802.1Q in SECURE mode for each port except CPU port,
3) to enable 802.1Q in FALL BACK mode for the CPU port.
4) to add VLAN ID 1 with member port 0 and CPU port
(untagged egress),
5) to add VLAN ID 2 with member the rest of the ports and CPU port
(untagged egress),
6) to configure the default vid of each port:
Port 0 have PVID 1, CPU port has PVID 3, and the rest ports have PVID 2.
Note: CPU port's PVID should be unknown VID, so that QuarterDeck can use VlanTable (header info) for TX.