North American Network Operators Group|
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Re: Why doesn't BGP...
Peter Lothberg <roll@Stupi.SE> wrote: >On the radio1:: > "101 north is congested, take 280 instead" > >Guess what hapens 5 minutes laster; >On the radio2:: > "280 north is congested, take 101 instead" >goto on the radio1 Goto the theory of control systems :) This is a textbook case of a system with too strong negative feedback loop. There are two ways to deal with that -- reduce the feedback (say, make the announcement in a barely intelligible speech, so only 1/3rd of drivers will get it :), or increase inertia of the system (by posting 10MPH speed limit :), so announcements can come fast enough to compensate each other. Seriously, the load-sensitive traffic management _can_ be done, but to do it you a) need full knowledge of the load patterns, plus some historical data, and b) have a way to control system in steps less drastic than rerouting an entire flow. Can't be done with ciscos, or any existing routers... --vadim - - - - - - - - - - - - - - - - -