we have two WLC. WLC1 in one data center and WLC2 in DR data center. I've to upgrade s/w on both WLCs. currently all of our APs are associated with WLC1 so I'll upgrade WLC2 1st. and then WLC1. when I ugprade WLC1 then all APs will failover to WLC2. once WLC1 s/w ugprade is done then I've to failover all APs to WLC1. how do I do that?
Plus: I found that two images on cisco website. FUS.aes and .aes file. do I have to upload both files on WLC for ugprade? which one should I upload first?