Recently it has come to my attention that Management wishes to pursue the possibility that one controller on a WiSM can run on an older version than the other controller (on the same WiSM).
Quick reasoning behind it is that our Wireless network is strictly LWAPP at the moment with close to 150x 1000 model APs deployed. Naturally this means we are stuck on version 4.2 as 5.0 and above do not support 1000 model APs, and replacing all our APs is pretty much out of the question at this time.
We also cannot use the newer APs because Cisco has started using CAPWAP now, which doesn't work on 4.2 of course.
So, this brings up a couple questions that I would like answered and verified:
1. Is it feasible/safe to run multiple software versions on the same WiSM blade, one per controller?
2. What are the downfalls of this?
3. Would I need to configure the management interfaces on both controllers to be different subnets from each other (if possible)? I would like to avoid the 1000 APs from associating to the higher version.
4. Will I need to disable LAG?
5. Which version would be recommended for the second controller?
6. I'm assuming that WCS will be able to handle both controllers, as long as the WCS is on the most recent version (to match the highest version controller). Is this correct?
That's all I can think of for now. Please add any comments/concerns that I should know about with this kind of configuration setup.