There's not a way that I'm aware of that would allow you to do this. The radius servers are defined locally, and in my testing, can hit any one of them. I use two servers for redundancy, and I've seen them both randomly be hit. My only suggestion would be make sure that you have the same database across radius servers so you can account for a user should they hit any one of the three servers that you have.
HTH,
John
HTH,
John
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