[6086] in North American Network Operators' Group
Re: Why doesn't BGP...
daemon@ATHENA.MIT.EDU (Daryn D. Fisher)
Mon Nov 11 15:31:20 1996
From: "Daryn D. Fisher" <oz@thoughtport.net>
Date: Mon, 11 Nov 96 13:17:44 -0700
To: nanog@merit.edu
Reply-To: oz@tpa.net
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@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
