I would like know
1) Whether Cat 9800 wireless controller can support IW3702 because IW3702 doesnt have DNA license when I configured in CCW
2) How to select number of AP license in Cat 9800? Is Cat 9800 only work for AP that have DNA license only?
1. Yes, 3700 series is supported in 9800 WLC
2. You can go with "AIR-DNA-x" as explained in below. 9800 work with smart licensing, so as long as you have AP licences on your smart licensing ports that should work.
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Even you do not plan to use DNA-C (appliance), you have to choose that DNA subscriptions as that is how licensing work. Two types of licensing tiers "DNA-Essential" or "DNA-Advantage"