ISP operational question

["Charles Smith" <chasmith9 () hotmail com>]

Please consider the following scenario:

A new company wants to become a regional ISP. This company will purchase one 
or two large bandwidth circuits from a NSP of their choice.

Then the new regional ISP will offer private line p2p Internet service to 
regional businesses. Basically, this is a small operation.

Now here is the question. What choices does the regional ISP have when 
implementing routing and IP addressing? I assume the regional ISP will not 
implement BGP, since there will only be one maybe two upstream connections 
to a single NSP - initially.

Furthermore, I assume the NSP would provide the regional ISP with a supernet 
- say a /20 or so. Then the regional ISP would allocate subnets of the 
supernet to their customer - say /24s.

I also assume the regional ISP would not require an AS number since they are 
not implementing BGP. Basically, all traffic from the regional ISP and 
customers is default routed to the single upstream connection.

Are these assumptions valid? Is this a good configuration? I realize 
multiple upstreams from different providers is optimal, however not 
plausdable in this case.

Your constructive insight to the scenario is appreciated.

Chas
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