Microsoft's Datacenter TCP (DCTCP): TCP Congestion Control for Datacenters

Document Type Replaced Internet-Draft (individual in tsv area)
Authors Stephen Bensley  , Lars Eggert  , Dave Thaler  , Praveen Balasubramanian  , Glenn Judd 
Last updated 2015-10-14 (latest revision 2015-07-07)
Replaced by RFC 8257
Stream Internet Engineering Task Force (IETF)
Intended RFC status Informational
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-tcpm-dctcp
Action Holders
Consensus Boilerplate Unknown
Telechat date
Responsible AD Martin Stiemerling
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo describes Datacenter TCP (DCTCP), an improvement to TCP congestion control for datacenter traffic. DCTCP uses improved Explicit Congestion Notification (ECN) processing to estimate the fraction of bytes that encounter congestion, rather than simply detecting that some congestion has occurred. DCTCP then scales the TCP congestion window based on this estimate. This method achieves high burst tolerance, low latency, and high throughput with shallow- buffered switches.


Stephen Bensley (
Lars Eggert (
Dave Thaler (
Praveen Balasubramanian (
Glenn Judd (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)