[c-nsp] Switch recommendation

[Vincent De Keyzer]

> Not sure what pre-wimax gear you are using, but our Alvarion radio gear
> supports tagged VLAN and the CPE can untag if desired. I'm working on
> setting up separate VLANs for seperate customer groups. Then each
> VLAN can have it's own router to the internet or corresponding
> agency office. Non-roaming users can use a routed netblock at each BS,
> and mobile users will use various layer2 vlans. Since we have more
> non-roamers than roamers, it should give us the benefits of a routed
> network for the fixed customers, and the benefits of the flat network
> for the smaller number of roaming users.

Maybe that's an option (although it would require a lot of changes at
product definition level)... but we already have seen "fixed" customers
"roaming" between two BS while their CPE did not move at all - this happens
when they are at the limit of two BS coverage areas, and due to radio magic
the CPE decides that signal is not strong enough anymore, so it de-registers
from the BS and re-registers to another... we cannot tell those customers to
buy a "roaming" subscription while they don't move at all!

Vincent