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have a look on this link . https://www.rdoproject.org/networking/neutron-with-existing-external-network/
you can create the interface fie if not already done.

DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=192.168.122.212 # Old eth0 IP since we want the network restart to not 
                       # kill the connection, otherwise pic your something outside your dhcp range
NETMASK=255.255.255.0  # your netmask
GATEWAY=192.168.122.1  # your gateway
DNS1=192.168.122.1     # your nameserver
ONBOOT=yes


And change the config file of your physical interface

DEVICE=eth0
HWADDR=52:54:00:92:05:AE # your hwaddr (find via ip link show eth0)
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-ex
ONBOOT=yes