A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Identifying Modified Explicit Congestion Notification (ECN) Semantics for Ultra-Low Queuing Delay
Authors : Koen De Schepper
Bob Briscoe
Ing-jyh Tsang
Filename : draft-briscoe-tsvwg-ecn-l4s-id-01.txt
Pages : 24
Date : 2016-03-21
Abstract:
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, even during high
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.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-briscoe-tsvwg-ecn-l4s-id/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id-01
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-briscoe-tsvwg-ecn-l4s-id-01
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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