/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

allow-ovs ovsbr0
iface ovsbr0 inet static
    address 10.10.189.3
    netmask 255.255.255.192
    broadcast 10.10.189.63
    gateway 10.10.189.1
    ovs_type OVSBridge
    ovs_ports eno1

allow-ovsbr0 eno1
iface eno1 inet manual
    ovs_bridge ovsbr0
    ovs_type OVSPort


/etc/network/if-pre-up.d/openvswitch

output set -xv

sep 21 18:43:30 shu ifup[663]: if [ -z "${IF_OVS_TYPE}" ]; then
Sep 21 18:43:30 shu ifup[663]:     exit 0
Sep 21 18:43:30 shu ifup[663]: fi
Sep 21 18:43:30 shu ifup[663]: + [ -z  ]
Sep 21 18:43:30 shu ifup[663]: + exit 0