VP
/interface bridge
add admin-mac=BE:64:A6:48:7B:F7 auto-mac=no name=bridge1
/interface ethernet switch port
set 0 vlan-header=add-if-missing vlan-mode=secure
set 1 default-vlan-id=1203 vlan-header=add-if-missing vlan-mode=secure
set 5 vlan-mode=secure
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
/interface ethernet switch vlan
add independent-learning=yes ports=ether1,ether2 switch=switch1 vlan-id=1203
add independent-learning=yes ports=ether1,ether2 switch=switch1 vlan-id=1253
/ip dhcp-client
add dhcp-options=hostname,clientid disabled=no interface=bridge1
P.S. Atheros 8327