This is indeed an interesting question although I never heard that it is
being done...
If I were to take a guess, it would be to manipulate traffic so that
upstreams A would always be preferred. (append extra AS paths and a default
route should do the trick). Then there has to be some kind of network
management tools to send out alerts when the accumulated traffic for
upstream A reaches 300G. At that point, you can tell the router to take B as
preferred while put A as backup.
Your upstream provider might have a traffic monitoring web page that you can
log into to view the same results.
Any better ideas?
Richard
""[EMAIL PROTECTED] (John Nemeth)"" wrote in
message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Here's a weird BGP question I got today. Take a standard
> dual-homed site using BGP to connect to two upstreams. Is it possible
> to get BGP to route the first 300G of traffic per month to upstream A
> and the rest to upstream B? I'm told it's done all the time, but
> somehow I doubt it.
>
> Before the famous question gets asked, the problem being solved is
> cost. The idea is to not exceed the minimum cost of upstream A.
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