BBR Congestion Control

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Publisher: IETF
Doc Type: Standard
Abstract: This document specifies the BBR congestion control algorithm. BBR ("Bottleneck Bandwidth and Round-trip propagation time") uses recent measurements of a transport connection's delivery rate, round-trip time, and packet loss rate to build an explicit model of the network path. BBR then uses this model to control both how fast it sends data and the maximum volume of data it allows in flight in the network at any time. Relative to loss-based congestion control algorithms such as Reno [RFC5681] or CUBIC [RFC8312], BBR offers substantially higher throughput for bottlenecks with shallow buffers or random losses, and substantially lower queueing delays for bottlenecks with deep buffers (avoiding "bufferbloat"). BBR can be implemented in any transport protocol that supports packet-delivery acknowledgment. Thus far, open source implementations are available for TCP [RFC793] and QUIC [RFC9000]. This document specifies version 2 of the BBR algorithm, also sometimes referred to as BBRv2 or bbr2.
Publication Date: 2022-03-07
Status Note: Internet-Draft
Link: https://datatracker.ietf.org/doc/html/draft-cardwell-iccrg-bbr-congestion-control-02/
Author(s): Neal Cardwell
Yuchung Cheng
Soheil Hassas Yeganeh
Ian Swett
Van Jacobson
Keyword(s): Congestion Control, TCP, QUIC

Normative Reference(s)

IETF RFC 793 [Superseded*]
IETF RFC 2018 [Active*]
IETF RFC 2119 [Active*]
IETF RFC 4340 [Active*]
IETF RFC 5226 [Superseded*]
IETF RFC 5681 [Active*]
IETF RFC 6298 [Active*]
IETF RFC 7323 [Active*]
IETF RFC 7942 [Active*]
IETF RFC 8312 [Superseded*]
IETF RFC 8985 [Active*]
IETF RFC 9000 [Active*]

Bibliographic Reference(s)

IETF.draft-cheng-iccrg-delivery-rate-estimation — Delivery Rate Estimation EXTERNAL
IETF.draft-romo-iccrg-ccid5 — Profile for Datagram Congestion Control Protocol (DCCP) Congestion Control ID 5 EXTERNAL
TCP ACK suppression EXTERNAL
BBR: Congestion-Based Congestion Control EXTERNAL
TSO, fair queuing, pacing: three's a charm EXTERNAL
TCP-NV: An Update to TCP-Vegas EXTERNAL
BBR: Congestion-Based Congestion Control EXTERNAL
BBR Startup Pacing Gain: a Derivation EXTERNAL
Deprecating The TCP Macroscopic Model EXTERNAL
CUBIC: A New TCP-Friendly High-Speed TCP Variant EXTERNAL
Power and deterministic rules of thumb for probabilistic problems in computer communications EXTERNAL
An Invariant Property of Computer Network Power EXTERNAL
TCP Vegas: end-to-end congestion avoidance on a global Internet EXTERNAL
TCP/IP Illustrated, Volume 2: The Implementation EXTERNAL
Congestion Avoidance and Control EXTERNAL
BBR Drain Pacing Gain: a Derivation EXTERNAL
Modified TCP Congestion Avoidance Algorithm EXTERNAL

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Referenced By

IETF RFC 9330 [Active*]
IETF RFC 9331 [Active*]
IETF RFC 9332 [Active*]
IETF RFC 9743 [Active*]