Why doesn't BGP...
Daryn D. Fisher
oz at thoughtport.net
Mon Nov 11 20:17:44 UTC 1996
Is this really a discussion for this list-server?
I don't know about all of you, but I don't have the time to
continually read a re-hash of age-old discussion.
Peter Lothberg <roll at 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
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