1-prefix, 1-AS question

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Hello,
   I'm a newcomer to the world of BGP, though I have some experience
with Internet routing.  My company is just now having to become its
own AS and start handling routing to the outside world.

The situation is this: we have until now been connected through a
single provider, P1, and have been included in their AS.  Now we're
planning to connect to P2 and P3 as well.  Our IP addresses belong
to P1's CIDR block.

I read in Hawkinson & Bates' Internet draft "Guidelines for creation,
... of an AS" that a prefix should ordinarily belong to only a single
AS, but that it is not unacceptable to have it belong to multiple ASes.
But I don't understand BGP well enough to see under what circumstances
this may be allowed.

My question is:
If we advertise our routes via BGP to P2 and P3, will this conflict
with their implicit advertisement by P1 as part of P1's CIDR block?

If I've missed something in the literature, a pointer would be much
appreciated. Thanks in advance,


Dave Iannucci                                     ATSON, Inc., Tokyo, Japan