OVS 2.6.1 and 2.5.1 formal release are both not compatible with CentOS 7.3 release. The error is related to ‘netdev_notifier_info_to_dev’ function, occurred at compilation. OVS master branch is tested ok. Considering CentOS 7.3 is a major and important release, would you like to back port the fix to 2.5.1 or 2.6.1?