Some basic rules on regulatory domains:
- APs located in a specific regulatory domain (country) may only terminate on controllers that carry that domain. FCC mandates that APs located in the US are terminated on a US controller.
- You can't order a RW controller for the US or vice-versa.
- You can't order a RW AP for the US or vice-versa. In fact, I have seen US APs being seized by customs when they were shipped into the European Union. You are just not allowed to have an AP or controller outside its regulatory domain. This may also force you to order equipment local in the country rather than one order for your complete environment.
- So US APs must terminate on a US controller located in the US. RW APs must terminate on a RW controller located outside the US and inside the RW regulatory domain.
- Master-local does not support cross-regulatory domain, as on a US master you cannot even configure another regulatory than US, and on a RW controller you can't configure US regulatory.
- ArubaOS 8.x with Mobility Master does support cross-regulatory as the MM does not terminate any APs. You can configure MDs in the different regulatory zones to handle their regulatory zone APs.
All of the above results in that you will likely end up with at least one controller (or two for redundancy) in each regulatory domain that you operate in and use either Airwave with 'all-master design' or Mobility Master with the option of controller-clusters to sync the configuration if needed.