Comment # 5 on bug 956180 from tom master

Sorry, i have not exact described that bug:

openSUSE 13.2:
All Hardware have get the biosdevname, virtual systems too!

Leap 42.1:
Only pure DELL Hardware-Systems becomme bios dev names!

So when you upgrade a route or something similar (example VMs) without direct
konsole access. you will get no access after upgrade. The Network Interfaces
will  be no longer a ens0p2, like on 13.2, but eth0 eth1 ..

Solution:
Is to activate the biosdevname for all Hardware 
or put a comment in the upgrade docu. so everybody can rename ifcfg-ens0p2 to
eth0  after zypper dup before reboot.