Yikes. I think I'll defer to Howard, et. al. on that one. Here are my
thoughts on it, though.
For each separate routing policy you want to present to the internet,
you need a separate AS. This is to prevent inconsistent views of your
AS in the internet. Once you have connected your networks, if you are
planning on having both networks advertise the prefixes of the other,
then that means you now have a single routing policy and should use a
single AS on all of your border routers.
In practice, this is going to get complex very quickly and someone who
actually has done this sort of thing before should advise you. I'm
guessing Howard might chime in any moment since this is right down his
alley.
Regards,
John
>>> "Alassar, Sonia" <[EMAIL PROTECTED]> 3/22/01 12:44:51 PM >>>
Yes, I am speaking about routing on the internet with BGP-4. If I am a
carrier that has 1 AS and I purchase another network (that has
multiple
ASes) from another carrier, should I integrate them into a single AS,
or
keep them as multiple AS? It is not that I want to have multiple AS,
however, I will have them via the acquisition. The question is should I
keep
them separate, or migrate them into one. What added benefit do I get if
I
have one? A second question is if 1 AS is so great, why do Sprint,
WorldCom,
AT&T, and Genuity all have multiple AS?
Sonia
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