I am not sure I am doing this right!!
swp1-2 trunks for vlan100 and 200
swp3 is an access port vlan 100
swp4 is an access port vlan 200
How would the config look like? - I still don't get the concept of a bridge, also why I don't seem to need to create a swp1-2 'bridge-trunk <vlan>...'
here is my guess...
bridge-vlan-aware yes bridge-ports glob swp3-4, swp1-2 bridge-vids 100 200
auto swp3 iface swp3 bridge-access 100
auto swp4 iface swp4 bridge-access 200