Here's my scenario:
Main Mikrotik router is in my main office, it connects to my first wireless base station via 802.11a link (AirStream PtP Radios). That base station has three 120 sector APs broadcasting a 802.11b signal. I have a second p2p link from there to my second base station, which also has 3 802.11b radios on it. At both base stations the hardware is connected via a DLink Managed switch. I have set up separate VLANs to each radio to separate the traffic. Here's my question: How do I set up the PPPoE Server to respond to requests on each VLAN? Currently I added a PPPoE server to each VLAN interface, but that seems like it will get unmanagable very quickly. I've also noticed that with this scenario I can log in simultaneously into each VLAN with one set of credentials - this is not desirable. I would like to limit connections to one per username regardless of which radio(VLAN) the user connects to. One of the ways I think this might work is if I bridge all of the VLAN interfaces & add the PPPoE Server to the bridge, but wouldn't that defeat the whole idea of separating traffic by VLANs? Any ideas would be appreciated.

Well, if you don't want to bridge, then one PPPoE Server be interface is your only option (even though you *can* bridge and *just* allow PPPoE to go over the bridge).

Multiple logins and the like... Use Radius... Problem solved

I am using Radius. After poking around I figured out that concurrency control wasn't enabled on the Radius server. That's now fixed.
I am also running the hotspot service on the system.
Which is the better way to go; bridge all VLan's & add HotSpot & PPPoE to Bridge, or add them individually to each VLan?
Pro's & Cons of each?
I know management of the services will be more difficult if I add them individually, but do I gain stability & performance?

Im not sure if pppoe and hotspot will operate on the same interface (ala bridge) - I doubt it.

Perhaps bridge together for PPPoE, and seperate bridge for Hotspot...

Hello,
first of all you can not bridge vlans.
It will not work properly on MT.
I would bridge all the broadcasting sectors into one bridge.

savage: You can set pppoe and hotspot server on the same interface
with no interference on each other.

Regards,
Stoned.

Sorry for the ignorance; but I'm not exactly sure what you mean by "bridge all the broadcasting sectors".