Here's some of the factors and concerns I have had about subnet sizing and WLAN separation guidelines. I'm interested in what others are doing to address this.
1. Right-sizing of subnets: what are folks doing with their wireless subnets in dense deployments? How are you providing scalability to support highly-dense device populations (tags, phones, medical devices)?
Are you using the default WLAN interface and assigning between a /24-/22, or using AP Group WLAN sub-interface mappings?
How are you sizing your AP Groups? Dense vs. Sparse client base, Campus vs. WAN sites, or a set # of APs per group?
2. How are you differentiating your WLANs? By traffic categories (data/voice/video)? Authenticaion methods? Device types (tags, phones, laptops)? Or specific application isolation and policy enforcement?
Thanks for your collective feedback towards a fruitful discussion.
--Bruce Johnson