the lenny/squeeze way.
/etc/network/interfaces
auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto eth0.201 iface eth0.201 inet manual auto eth0.200 iface eth0.200 inet manual auto eth0.202 iface eth0.202 inet manual auto br1 iface br1 inet static address 10.15.10.10 netmask 255.255.255.0 gateway 10.15.10.1 bridge_ports eth0.201 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto br0 iface br0 inet manual bridge_ports eth0.200 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto br2 iface br2 inet manual bridge_ports eth0.202 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off