[tsvwg] I-D Action: draft-ietf-tsvwg-ecn-l4s-id-08.txt

internet-drafts@ietf.org Mon, 04 November 2019 23:59 UTC

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Subject: [tsvwg] I-D Action: draft-ietf-tsvwg-ecn-l4s-id-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Area Working Group WG of the IETF.

        Title           : Identifying Modified Explicit Congestion Notification (ECN) Semantics for Ultra-Low Queuing Delay (L4S)
        Authors         : Koen De Schepper
                          Bob Briscoe
	Filename        : draft-ietf-tsvwg-ecn-l4s-id-08.txt
	Pages           : 42
	Date            : 2019-11-04

   This specification defines the identifier to be used on IP packets
   for a new network service called low latency, low loss and scalable
   throughput (L4S).  It is similar to the original (or 'Classic')
   Explicit Congestion Notification (ECN).  'Classic' ECN marking was
   required to be equivalent to a drop, both when applied in the network
   and when responded to by a transport.  Unlike 'Classic' ECN marking,
   for packets carrying the L4S identifier, the network applies marking
   more immediately and more aggressively than drop, and the transport
   response to each mark is reduced and smoothed relative to that for
   drop.  The two changes counterbalance each other so that the
   throughput of an L4S flow will be roughly the same as a 'Classic'
   flow under the same conditions.  However, the much more frequent
   control signals and the finer responses to them result in ultra-low
   queuing delay without compromising link utilization, and low delay is
   maintained during high traffic load.  Examples of new active queue
   management (AQM) marking algorithms and examples of new transports
   (whether TCP-like or real-time) are specified separately.  The new
   L4S identifier is the key piece that enables them to interwork and
   distinguishes them from 'Classic' traffic.  It gives an incremental
   migration path so that existing 'Classic' TCP traffic will be no
   worse off, but it can be prevented from degrading the ultra-low delay
   and loss of the new scalable transports.

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