When creating a bridge interface, the new bridge interface becomes the primary interface that you talk to. It assumes control of whatever your original physical interface was doing. This is dangerous if you are bridging your primary ethernet interface because if you don't setup the bridge correctly you will be locked out of your machine.
ssh -o Tunnel=ethernet -f -w 0:0 10.10.10.7 true
ifconfig tap0 up brctl addbr br0 brctl stp br0 on ifconfig br0 up brctl addif br0 tap0 ip route add 10.10.10.0/24 dev br0 ip route add default via 10.10.10.1