hey justin, Collapsing AS'es has its technical benefits, ultimately resulting in financial benefits. For starters, you'll be able to manage your transit traffic better (and thus grow your pipes in a more sane manner). You'll also be able to control your inter-AS traffic much better (especially if you plan to eventually collapse and use common servers/services across AS'es). An example of this is consolidating your news server farms or mail server farms. One approach on the BGP front before merging AS'es is to make sure you have a common local pref and community infrastructure among the AS'es you want to merge. attempting to go confeds with mismatching local pref and community based policies might be a headache. On the IGP front, make sure that your private networks are distinct among AS'es. Once you merge OSPF entities, you could have duplicate 192.168.x.x spaces. That's a start. my 0.02 cents worth. Btw, if you make it to nanog, make sure to grab josh fleishman/jeb linton of mindspring/earthlink a line. They also went through a big AS consolidation a few months ago. Miguel de Leon Dimayuga God does not ask us to be successful, Networks & Technologies only to be faithful. Cbeyond Communications -Mother Teresa of Calcutta