disable Ethernet Port in Engineering leads to strange behavior of the stack (certification issue)

If an Ethernet port is disabled in Engineering system (e.g. Step7) this is internaly done in the stack in an incorrect way.
This leads to strange effects, e.g.

• many many link Change indications generated by the stack
• if an AR is configured with FSU and the AR is not existing DCP Hello frames are send infinitely
• very high CPU load on netX (~100%)