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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