Maybe a historic reason, merger that has not been fully integrated?
Maybe not worth the hassle/interruption of doing the migration to a single AS.
Separate realms of control/policy?

William Jackson
NGN Engineering

Gibtelecom 
Email: [email protected] 


-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of mert ozkul
Sent: 06 December 2012 12:55
To: [email protected]
Subject: [c-nsp] ISP Dual AS

Hi All,
I have query about ISP Design.
Why some ISP`s (Ex: BT) using dual AS`es on their network?  
What are the advantages of using more than one AS in the ISP network?What can 
be achieved if you use more than one AS?
Thanks,Best Regards,
-Mert                                     
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