Red Hat Enterprise Linux 7 still offers a possibility to specify names for network interface by setting DEVICE and HWADDR options in /etc/sysconfig/network-scripts/ifcfg-* configuration files. Unfortunatelly, udev does not support swapping interface names anymore. In the case that you set ethX names to multiple network card and kernel discovers them in a different order, udev rule 60-net.rules will most likely fail.

It is highly recommended to rename such interfaces or remove DEVICE line from ifcfg configuration files.

Red Hat Enterprise Linux 7 also introduces predictable network interface device names: http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
