gistfile1.txt

apt-get update 
apt-get install -y linux-headers-virtual
apt-get install -y openvswitch-datapath-dkms
apt-get install -y openvswitch-switch openvswitch-controller openvswitch-brcompat
/etc/init.d/openvswitch-switch start
ovs-vsctl add-br br0
sudo ovs-vsctl add-port br0 gre0 -- set interface gre0 type=gre options:remote_ip=10.8.0.3
sudo ovs-vsctl add-port br0 gre1 -- set interface gre1 type=gre options:remote_ip=10.8.0.5
ovs-vsctl add-port br0 test -- set interface test type=internal
ifconfig test 172.24.16.1/24 up
ifconfig br0 up