| > Except you do lose out on best path routing / any other outbound TE, and you’re now restricted to rudimentary load balancing methodologies / manual prefix-specific hackery. After 3-4 hops you're probably hitting a Tier 1 network, after which point you can basically think of the Internet like cloud icon you see in many diagrams, because your route choices are no longer really determining reachability, rather the choices of other people/companies are: * https://en.wikipedia.org/wiki/Tier_1_network If you're talking about reachability of a network on another continent or the other side of the planet, your local decisions aren't going to much to determine the path. The main thing to have locally for routing decisions is the ASNs/networks of the other customers of your ISPs: if Service A is also a customer of ISP #1, you want to send traffic for them through that service instead of ISP #2. The other nice thing to have is the reachability to the closest IXP, as quite often many CDNs have connections to those. Beyond knowing IXP reachability and other-customers reachability, I don't think there are many other advantages for a smaller entity on the Internet, so a full Internet-wide BGP is not needed. |