On Sat, 4 Sep 2010, Mohammad Khalil wrote:
we use OSPF to transport customers routers into our backbone , i read in one of Cisco presentations that its best to use BGP for the same purpose
One reason not to use OSPF is control. By customers routers, I assume you mean CPE which you maintain/admin. If you use OSPF and a smart customer does password-recovery and breaks into their router and makes changes, they can inject routes into your network. OSPF has very little in the way of route filtering. With BGP, you would have a prefix filter on your end of the session that prevents CPE from injecting unexpected routes into your network. With BGP, it's also much easier to control which routes get advertised to each CPE. They probably only need a default route in most cases.
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