Neutron w/Existing Single Primary Interface

https://www.rdoproject.org/networking/neutron-with-existing-external-network/

• Delete existing bridge ovs-vsctl del-br br-ex
• Create bridge configuration /etc/sysconfig/network-scripts/ifcfg-br-ex

DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=172.11.11.120  # Old eno1 IP since we want the network restart to not
                      # kill the connection, otherwise pick something outside your dhcp range
NETMASK=255.255.252.0 # your netmask
GATEWAY=172.11.11.1   # your gateway
DNS1=172.11.11.18     # your nameserver
DNS2=172.11.11.19     # your nameserver
ONBOOT=yes

• Change your existing network interface /etc/sysconfig/network-scripts/ifcfg-eno1

DEVICE=eno1
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-ex
ONBOOT=yes

• Re-run your packer configuration with --provision-ovs-bridge=n