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Re: [tsvwg] [Bloat] [Ecn-sane] [iccrg] Fwd: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104

Bob Briscoe <ietf@bobbriscoe.net> Thu, 21 March 2019 08:02 UTC

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To: Jonathan Morton <chromatix99@gmail.com>
Cc: "Holland, Jake" <jholland@akamai.com>, tsvwg IETF list <tsvwg@ietf.org>, bloat <bloat@lists.bufferbloat.net>
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From: Bob Briscoe <ietf@bobbriscoe.net>
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Date: Thu, 21 Mar 2019 09:02:00 +0100
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Subject: Re: [tsvwg] [Bloat] [Ecn-sane] [iccrg] Fwd: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104
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Just to rapidly reply,


On 21/03/2019 07:46, Jonathan Morton wrote:
> The ECN field was never intended to be used as a classifier, except to distinguish Not-ECT flows from ECT flows (which a middlebox does need to know, to choose between mark and drop behaviours).  It was intended to be used to convey congestion information from the network to the receiver.  SCE adheres to that ideal.

Each PHB has a forwarding behaviour a DSCP re-marking behaviour and an 
ECN marking behaviour. The ECN field is the claissifer for the ECN 
marking behaviour.


Bob

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

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