Unique AS number when connecting to two different ISP's?

From: Gregory Gombas (ggombas@gmail.com)
Date: Sun Jul 29 2007 - 15:04:31 ART

When connecting to the internet via two different ISP's, why is it
necessary to have a unique AS?

What if you simply configured your BGP router with the same AS number
as one of your ISP's?

Considering there are only 64511 unique AS numbers, I assume that most
if not all the AS numbers are already taken. What do companies do in
the case they cannot get their own AS number and need to multihome?

Thanks,
Greg

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