For the last 10 years, I've been preaching that you should use static BGP prefix advertising (with the network mask router configuration command) to advertise your IP address space into the public Internet, not the BGP aggregation. I might see some use for BGP aggregation in enterprise networks (or MPLS VPN networks) using BGP as the core routing protocol with other routing protocols serving the edge, but I cannot find a good scenario where BGP aggregation in public Internet would be a good solution. Do you use BGP aggregation in your network? Do you have a good scenario that you'd like to share with us? Write a comment.