ifcfg file for OVS bridge with NM_CONTROLLED=yes

[Kai Su <skai vmware com>]

Hi,

I’m trying to add an ifcfg file for an OVS bridge, with NM_CONTROLLED=yes. But I met with following warning 
when I tried to bring up the interface, and the bridge was not created:
Apr 18 21:12:04 oc3.oc.local NetworkManager[97347]: <warn>  [1524082324.0288] ifcfg-rh: Ignoring connection 
/etc/sysconfig/network-scripts/ifcfg-brexample (eff31d60-71d3-8ac9-a2ad-a429658a5895,"System brexample") of 
unrecognized type.

This is my ifcfg file:
DEVICE=brexample
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=100.100.100.100
NETMASK=255.255.255.0
HOTPLUG=no
NM_CONTROLLED=yes

I’m running RHEL 7.5 with NetworkManager 1:1.10.2-13.el7, initscripts 9.49.41-1.el7.

Could you advise what the correct configuration parameters are for OVS bridges and ports, please, so that 
they can be managed by NM? Thanks a lot.

Best,
Kai