Centos 7: failed to bring up/down networking: configure interface for a trunk interface

it seems that disabling NetworkManager did the trick :)

systemctl stop NetworkManager
systemctl disable NetworkManager

Maybe a little late, but the problem in my case was that the UUID field of the two interfaces was the same, and they must be unique. Disabling NetworkManager does the trick, but the real solution would be changing/deleting the field. Leaving this here for future reference.

I was facing the same issue. Fortunately,

/etc/rc.d/init.d/network stop

gracefully stopped the network service. Then I did an:

ip addr flush dev <<dev-name>>

After that you can start the service, using either systemctl or /etc/rc.d/init.d/network start.