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docid.id RFC 9331
docid.type IETF
docid.primary True
docid#2.id 10.17487/RFC9331
docid#2.type DOI
docnumber RFC9331
language en
type standard
script Latn
date.value January 2023
date.type published
title.content The Explicit Congestion Notification (ECN) Protocol for Low Latency, Low Loss, and Scalable Throughput (L4S)
title.format text/plain
title.type main
abstract.content <p>This specification defines the protocol to be used for a new network service called Low Latency, Low Loss, and Scalable throughput (L4S). L4S uses an Explicit Congestion Notification (ECN) scheme at the IP layer that is similar to the original (or 'Classic') ECN approach, except as specified within. L4S uses 'Scalable' congestion control, which induces much more frequent control signals from the network, and it responds to them with much more fine-grained adjustments so that very low (typically sub-millisecond on average) and consistently low queuing delay becomes possible for L4S traffic without compromising link utilization. Thus, even capacity-seeking (TCP-like) traffic can have high bandwidth and very low delay at the same time, even during periods of high traffic load.</p><p>The L4S identifier defined in this document distinguishes L4S from 'Classic' (e.g., TCP-Reno-friendly) traffic. Then, network bottlenecks can be incrementally modified to distinguish and isolate existing traffic that still follows the Classic behaviour, to prevent it from degrading the low queuing delay and low loss of L4S traffic. This Experimental specification defines the rules that L4S transports and network elements need to follow, with the intention that L4S flows neither harm each other's performance nor that of Classic traffic. It also suggests open questions to be investigated during experimentation. Examples of new Active Queue Management (AQM) marking algorithms and new transports (whether TCP-like or real time) are specified separately.</p>
abstract.format text/html
abstract.script Latn
abstract.language en
revdate January 2023
contributor.role.type author
contributor.person.name.given.forename.script Latn
contributor.person.name.given.forename.language en
contributor.person.name.given.forename.initial K
contributor.person.name.given.formatted_initials.content K.
contributor.person.name.given.formatted_initials.script Latn
contributor.person.name.given.formatted_initials.language en
contributor.person.name.surname.content De Schepper
contributor.person.name.surname.script Latn
contributor.person.name.surname.language en
contributor.person.name.completename.content K. De Schepper
contributor.person.name.completename.script Latn
contributor.person.name.completename.language en
contributor#2.role.type editor
contributor#2.person.name.given.forename.script Latn
contributor#2.person.name.given.forename.language en
contributor#2.person.name.given.forename.initial B
contributor#2.person.name.given.formatted_initials.content B.
contributor#2.person.name.given.formatted_initials.script Latn
contributor#2.person.name.given.formatted_initials.language en
contributor#2.person.name.surname.content Briscoe
contributor#2.person.name.surname.script Latn
contributor#2.person.name.surname.language en
contributor#2.person.name.completename.content B. Briscoe
contributor#2.person.name.completename.script Latn
contributor#2.person.name.completename.language en
contributor#3.role.type publisher
contributor#3.organization.name.content RFC Publisher
contributor#4.role.type authorizer
contributor#4.organization.name.content RFC Series
series.title.content RFC
series.title.format text/plain
series.number 9331
series.type main
keyword Burstiness
keyword#2 Performance
keyword#3 Queuing Delay
keyword#4 One Way Delay
keyword#5 Round-Trip Time
keyword#6 RTT
keyword#7 Jitter
keyword#8 Congestion Control
keyword#9 Congestion Avoidance
keyword#10 Quality of Service
keyword#11 QoS
keyword#12 Quality of Experience
keyword#13 QoE
keyword#14 Active Queue Management
keyword#15 AQM
keyword#16 Explicit Congestion Notification
keyword#17 ECN
keyword#18 Pacing
ext.schema-version v1.0.0
editorialgroup.name tsvwg
schema-version v1.2.1
id RFC9331