A practise that is becoming quite common is running BGP on the edges of an AS only. It is a waste for a router in the core to have a full internet table. The Core could then comprise of ie MPLS which would optimize the traffic flows. I cannot remember which book I used but when I was studying for the CCNP I read somewhere that IBGP routes have to be 'physically connected', this is untrue of course. As long as the IGP can reach the IBGP peer it is fine. The problem is that these misinterpretations stick. For a month or so before I was corrected I actually thought that a physical connection was a requirement. There is also something else to consider; the way one book I read worded a section on Route-reflectors and Confederations made it sound like you could only use either or, not both. This is untrue of course, you can use Route-reflectors inside a confederation. Just a note.
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