Re: ISO8473 vs. IP

Paul Tsuchiya (
Wed, 9 Sep 87 07:38:39 EDT

> From: "Marty Schoffstall" <>
> Status: R
> Isn't this mechanism a bit indirect? Does anyone have some
> thoughts about latency in a live ISO INTERNET?.
> Your transmitter is hosing the net, Mr. Gateway
> (whoops IS), 4 PDN's away determines there is
> congestion toggles the bit and we arrive at
> the receiver. The receiver then takes this
> Layer3 information exports it to the Layer4
> machine who does something bright with it
> like communicating with the transmitter Layer4.
> [ My recollection of this is that Layer4 had
> to be TP4, ie this wasn't going to
> be effective for other transports.]
> Marty

The algorithm doesn't work quite like that. In fact, the bit is
set roughly half the time, and all it takes is one packet in the
queue to set the bit. Setting it half the time has the result of getting
the most information out of it (information theory). So it is not
like there is a problem and then the bit is set to relieve the problem.
Instead, the bit is continuously set to achieve a smooth and appropriate
flow of data into the net. I.e., we neven (hopefully) reach the point
where a transmitter is hosing the net in the first place.

        Paul Tsuchiya
        The MITRE Corp.

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