> If it is a protocol stack (like TCP) then it can
> tell the far end
> to stop sending - so there will be a finite amount
> of excess data.

its called RED(random early detection) but its not
trivial ie  you might have several TCP connections and
if you tell all connections to back-off, then it will
lead to under-utilization of capacity. so you need to
smoothen the bandwidth-utlization graph.
regards
-kamal



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