iBGP Scaling

[tt tt <tt_745 () yahoo co uk>]

Hi List,

We are looking to move our non infrastructure routes into iBGP to help with our IGP scalability (OSPF).  We already run 
full BGP tables on our core where we connect to multiple upstream and downstream customers.  Most of our aggregation 
and edge routers cannot hold full tables and it's certainly not possible to upgrade them. Is there any reason why we 
shouldn't filter iBGP routes between our core and aggregation layers (we plan to use route reflectors) or should we be 
look at using a private AS number per POP?

Thanks

Dave