Haven't seen a mix like what you have. The major thing is APs moving to the other wlc. The 3600 will may try to join WiSM1 but will fail to join the WiSM1 but you existing APs might join and will upgrade to 7.2. If you require mobility between the wism1 and the wism2 then that should be fine, just be aware in case you have APs that flap. If you don't need mobility between the two, then you should have them in a different mobility group.
Sent from Cisco Technical Support iPhone App
-Scott
*** Please rate helpful posts ***