To get internet connectivity to the host machines only through the Open vSwitch,
USING DHCP
1: add the interface connected to internet(say eth0) on the OVS machine to the OVS bridge.
2: change the ip address of eth0 interface to 0 and get a dhcp ip to the bridge interface using dhclient
3: add the interfaces that are connected to the hosts to the OVS bridge
4: get dhcp ip's to the hosts by using dhclient on the host machines
USING custom IP addresses
1: add the interfaces connected to the hosts and the interface connected to the internet to the OVS bridge
2: make the internet interface ip as 0
3: set the bridge ip address to the ip address that was previously assigned to the internet interface
4: make sure you have the host ip addresses in the same network address range as the bridge IP address.