Hi Colin, thanks for your answer.
Controller 1 is running 6.3.1.19, I have no access to the second controller right now.
I am sure the setup you are proposing is the right one, I am planning that after a lab test which will take place in 4 weeks. I have already read through all availible documentation (Campus Redundancy Models, Redundancy Design Best Practices from 2005 and about central licensing) and came to the conclusion it needs more pratice as well as a lab test before changing something on the network. Especialy as we have two new subsidaries where i have learned to go with a combination of VRRP and LMS/BLMS N+1 deployment
Meanwhile I need a solution with "limited" redundancy capabilities. I only have 12 APs, so the licenses should not be an issue.
So could my "Idea" with Cold Standby work?