Outbound Routing Toward the Internet
The single biggest reason to consider using BGP between an enterprise and an ISP is to influence the choice of best path (best route). The idea of choosing the best path sounds appealing at first. However, because the majority of the end-to-end route exists inside the Internet, particularly if the destination is 12 routers and a continent away, it can be a challenge to determine which exit point from the enterprise is actually a better route.
As a result, enterprises typically have two major classes of options for outbound routing toward the Internet: default routing and BGP. Using default routes is perfectly reasonable, depending on the objectives. This section examines the use of default routes toward the ...
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