802.1Qau – Congestion Notification

The full title of this PAR is “IEEE Standard for Local and Metropolitan Area Networks—Virtual Bridged Local Area Networks – Amendment: 10: Congestion Notification.”.

This standard specifies protocols, procedures and managed objects that support congestion management of long-lived data flows within network domains of limited bandwidth delay product. This is achieved by enabling bridges to signal congestion information to end stations capable of transmission rate limiting to avoid frame loss. This mechanism enables support for higher layer protocols that are highly loss or latency sensitive. VLAN tag encoded priority values are allocated to segregate frames subject to congestion control, allowing simultaneous support of both congestion controlled and other higher layer protocols. This standard does not specify communication or reception of congestion notification information to or from stations outside the congestion controlled domain or encapsulation of frames from those stations across the domain.

Data center networks and backplane fabrics employ applications that depend on the delivery of data packets with a lower latency and much lower probability of packet loss than is typical of IEEE 802 VLAN bridged networks. This amendment will support the use of a single bridged local area network for these applications as well as traditional LAN applications.

There is significant customer interest and market opportunity for Ethernet as a consolidated Layer 2 solution in high-speed short-range networks such as data centers, backplane fabrics, single and multi-chassis interconnects, computing clusters, and storage networks. These applications currently use Layer 2 networks that offer very low latency and controlled frame loss due to congestion. Use of a consolidated network will realize operational and equipment cost benefits.

Current Status

Status	PAR approved September 15th, 2006; Standard approved March 25th, 2010; Published April 23rd, 2010.
Editor	Norm Finn

 

Archive

Date	Document
29 Sep 2006	802.1au, Draft 0.1
29 Aug 2007	802.1au, Draft 0.2
12 Nov 2007	802.1au, Draft 0.4
02 Apr 2008	802.1au, Draft 1.0
11 May 2008	802.1au, Draft 1.0 proposed comment dispositions
14 May 2008	802.1au, Draft 1.0 comment dispositions
11 Jul 2008	802.1au, Draft 1.1 with changebars
11 Jul 2008	802.1au, Draft 1.1
17 Jul 2008	802.1au, Draft 1.1 comment dispositions
08 Aug 2008	802.1au, Draft 1.2 with changebars
08 Aug 2008	802.1au, Draft 1.2
15 Sep 2008	802.1au, Draft 1.2 proposed comment dispositions
18 Sep 2008	802.1au, Draft 1.2 comment dispositions
08 Nov 2008	802.1au, Draft 1.3 with changebars
08 Nov 2008	802.1au, Draft 1.3
08 Nov 2008	802.1au, Draft 1.3
13 Jan 2009	802.1au, Draft 1.3 proposed comment dispositions
14 Jan 2009	802.1au, Draft 1.3 proposed comment dispositions
15 Jan 2009	802.1au, Draft 1.3 comment dispositions
13 Feb 2009	802.1au, Draft 1.4 with changebars
13 Feb 2009	802.1au, Draft 1.4
13 Feb 2009	802.1au, Draft 1.4
06 Mar 2009	802.1au, Draft 1.4 proposed comment dispositions
11 Mar 2009	802.1au, Draft 1.4 comment dispositions
24 Mar 2009	802.1au, Draft 2.0 with changebars
24 Mar 2009	802.1au, Draft 2.0
24 Mar 2009	802.1au, Draft 2.0
14 May 2009	802.1au, Draft 2.0 proposed comment dispositions
20 May 2009	802.1au, Draft 2.0 proposed comment dispositions
11 Jun 2009	802.1au, Draft 2.0 comment dispositions
11 Jun 2009	802.1au, Draft 2.1 with changebars
11 Jun 2009	802.1au, Draft 2.1
11 Jun 2009	802.1au, Draft 2.1
13 Jul 2009	802.1au, Draft 2.1 proposed comment dispositions
13 Jul 2009	802.1au, Draft 2.1 proposed comment dispositions
16 Jul 2009	802.1au, Draft 2.1 comment dispositions
23 Jul 2009	802.1au, Draft 2.2 with changebars
23 Jul 2009	802.1au, Draft 2.2
23 Jul 2009	802.1au, Draft 2.2
17 Aug 2009	802.1au, Draft 2.2 proposed comment dispositions
11 Sep 2009	802.1au, Draft 2.2 comment dispositions
28 Sep 2009	802.1au, Draft 2.3 with changebars
28 Sep 2009	802.1au, Draft 2.3
15 Oct 2009	802.1au, Draft 2.3
28 Oct 2009	802.1au, Draft 2.3 comment dispositions
28 Oct 2009	802.1au, Draft 2.4
28 Oct 2009	802.1au, Draft 2.4
10 Dec 2009	802.1au, Draft 2.4 proposed comment dispositions
15 Dec 2009	802.1au, Draft 2.4 proposed comment dispositions

 

Presentations

Date	Document
26 Jun 2006	Presentation au-sim-gupta-bcn-sim-environment-0606-v0-3.pdf
05 Jul 2006	Presentation au-sim-bkwan-bcn-sim-metrics-200607.pdf
19 Jul 2006	Presentation au-sim-wadekar-bcn-sim-env-0706-v1.pdf
20 Jul 2006	Presentation au-gusat-congestion-bmrk-0607-r089.pdf
02 Aug 2006	Presentation au-sim-bergamasco-common-bridge-model-080206.pdf
31 Aug 2006	Presentation au-sim-bergamasco-baseline-sim-scenario-080906v2.pdf
31 Aug 2006	Presentation au_sim_thaler_best_case_simulation.xls
06 Sep 2006	Presentation au-sim-kwan-bcn-calibration-060906.pdf
11 Sep 2006	Presentation au-sim-loh-bcn-calibration-091406.pdf
13 Sep 2006	Presentation au-sim-loh-bcn-calibration-091406.pdf
14 Sep 2006	Presentation au-sim-bergamasco-baseline-sim-scenario-091406v4.pdf
14 Sep 2006	Presentation au-sim-kwan-bcn-calibration-091406.pdf
20 Sep 2006	Presentation au-sim-bergamasco-baseline-sim-scenario-092106v5.pdf
20 Sep 2006	Presentation au-sim-loh-bcn-fairness-index-09202006.pdf
21 Sep 2006	Presentation au-sim-kwan-bcn-calibration-092106.pdf
28 Sep 2006	Presentation au-gusat-802-1-Tutorial-Survey-of-LL-FC-for-Datacenter-Ethernet-r1-2.ppt
28 Sep 2006	Presentation au-sim-wadekar-adhoc-report-092806v1.pdf
11 Oct 2006	Presentation au-sim-bergamasco-common-bridge-model-101206v2.pdf
11 Oct 2006	Presentation au-sim-loh-bcn-mod1-10122006.pdf
18 Oct 2006	Presentation au-sim-gupta-baseline-pause-101906.pdf
18 Oct 2006	Presentation au-sim-loh-bcn-pause-sample-window-10192006.pdf
19 Oct 2006	Presentation au-sim-ding-bcn-pause-w-innocent.pdf
19 Oct 2006	Presentation au-sim-ding-bcn-pause.pdf
25 Oct 2006	Presentation au-sim-bergamasco-bcnmax-comparison-102606.pdf
25 Oct 2006	Presentation au-sim-loh-bcn-sample-window-2-10262006.pdf
26 Oct 2006	Presentation au-sim-ding-bcn-pause-102606.pdf
31 Oct 2006	Presentation au-Lu-et-al-BCN-study.pdf
02 Nov 2006	Presentation au-sim-thaler-bcn-large-topo-110206.pdf
06 Nov 2006	Presentation au-thaler-802-1CNforIETF-061106-v2.pdf
06 Nov 2006	Presentation au-thaler-802-1CNforIETF-061106.pdf
08 Nov 2006	Presentation au-sim-bergamasco-bcnmax-comparison-110906v2.pdf
08 Nov 2006	Presentation au-sim-loh-bcn-innocent-flow-hotspot-degree.pdf
12 Nov 2006	Presentation au-BCN_luyi.pdf
14 Nov 2006	Presentation au-sim-ZRL-BCN-sens-analys-r101.pdf
14 Nov 2006	Presentation au-sim-ZRL-IBA-CM-sensitivity-sims-r100.pdf
14 Nov 2006	Presentation au-sim-loh-innocent-hotspot-degree-11152006.pdf
14 Nov 2006	Presentation au-sim-wadekar-adhoc-report-111406v1.pdf
14 Nov 2006	Presentation au-thaler-ietf-transport-area-report.pdf
15 Nov 2006	Presentation au-Brunner-Hazarika-Priority-Pause-considerations-111406.pdf
15 Nov 2006	Presentation au-ashvin-simulation.pdf
15 Nov 2006	Presentation au-jain-ecn-20061115.pdf
15 Nov 2006	Presentation au-lakshmikantha-presentation-pdf.pdf
15 Nov 2006	Presentation au-prabhakar-overview-pdf.pdf
20 Nov 2006	Presentation au-kwan-bcn-sims-summary-111506.pdf
30 Nov 2006	Presentation au-sim-Zurich-Hotspot-Bmrk-OG-r09.pdf
13 Dec 2006	Presentation au-sim-bergamasco-baseline-output-generated-121406v1.pdf
14 Dec 2006	Presentation au-sim-ZHB-OG-SS-r1.pdf
14 Dec 2006	Presentation au-sim-Zurich-Hotspot-Benchmark-OG-ss-01.pdf
15 Dec 2006	Presentation au-sim-Zurich-Hotspot-Benchmark-OG-MS-r2.pdf
21 Dec 2006	Presentation au-kwan-ding-prelim-multihop-bcn-061221.pdf
03 Jan 2007	Presentation au-sim-bergamasco-multihop-output-generated-010407v1.pdf
04 Jan 2007	Presentation au-sim-ding-kwan-multihop-output-generated-010407v1.pdf
06 Jan 2007	Presentation au-LL-FC-issues-PAUSE-r102.pdf
11 Jan 2007	Presentation au-sim-Zurich-Hotspot-Benchmark-dual-HS-r1.pdf
23 Jan 2007	Presentation au-ZRL-Ethernet-LL-FC-requirements-r03.pdf
23 Jan 2007	Presentation au-sim-ZRL-ZHB-sim-results-Monterey-r04.pdf
23 Jan 2007	Presentation au-wadekar-cm-discovery-protocol-needs-012407-v3.pdf
24 Jan 2007	Presentation au-bergamasco-bcn-ecn-comparison-jan-2007-interim-v0.1.pdf
24 Jan 2007	Presentation au-jain-fecn-20070124.pdf
24 Jan 2007	Presentation au-sim-bergamasco-bcn-large-topologies-jan-2007-interim.pdf
24 Jan 2007	Presentation au-sim-kwan-transient-duration-012407.pdf
24 Jan 2007	Presentation au-thaler-agenda-070124.pdf
25 Jan 2007	Presentation au-prabhakar-monterey-proposal-070124.pdf
25 Jan 2007	Presentation au-prabhakar-monterey-proposal-070124.ppt
07 Feb 2007	Presentation au-sim-ZRL-fat-tree-build-and-route-r1.0.pdf
09 Feb 2007	Presentation au-bergamasco-ecm-v0.1.pdf
13 Feb 2007	Presentation au-thaler-CN-0bjectives-0906.pdf
15 Feb 2007	Presentation au-kwan-ding-bcn-effects-of-delay-02152007.pdf
15 Feb 2007	Presentation au-sim-ZRL-OG-BCNmax-and-dyn-range-r10.pdf
22 Feb 2007	Presentation au-sim-bergamasco-on-metrics-070221.pdf
12 Mar 2007	Presentation au-bergamasco-ethernet-congestion-manager-070313.pdf
12 Mar 2007	Presentation au-sim-bergamasco-on-metrics-070313.pdf
13 Mar 2007	Presentation au-jain-fecn-20070313.pdf
13 Mar 2007	Presentation au-thaler-agenda-0703.pdf
14 Mar 2007	Presentation au-prabhakar-simple-ideas-0703.pdf
14 Mar 2007	Presentation au-sim-bergamasco-on-metrics-070314.pdf
18 Mar 2007	Presentation au-wadekar-march-2007-meeting-minutes-v01.pdf
21 Mar 2007	Presentation au-sim-IBM-ZRL-E2CM-proposal-r1.09b.ppt
22 Mar 2007	Presentation au-sim-ZRL-E2CM-src-based-r1.2.pdf
27 Mar 2007	Presentation au-prabhakar-simpleideas-070329.pdf
29 Mar 2007	Presentation au-sim-ZRL-E2CM-src-based-r1.1a.pdf
29 Mar 2007	Presentation au-sim-kwan-ding-revised-prelim-fecn-20070329.pdf
05 Apr 2007	Presentation au-sim-bergamasco-single-hop-output-generated-070405.pdf
11 Apr 2007	Presentation au-sim-bergamasco-single-hop-output-generated-070412.pdf
26 Apr 2007	Presentation au-sim-ZRL-E2CM-bursty-and-hiHSD-r1.1.pdf
03 May 2007	Presentation au-sim-ZRL-E2CM-bursty-hiHSD-BCN0-r1.1.pdf
10 May 2007	Presentation au-sim-ZRL-smallmem-r1-1.pdf
10 May 2007	Presentation au-sim-ZRL-smallmem-r1-0.pdf
17 May 2007	Presentation au-prabhakar-qcn-description.pdf
22 May 2007	Presentation au-ko-fabric-convergence-0507.pdf
29 May 2007	Presentation au-jain-fecn-enhanced-20070530.pdf.filepart
29 May 2007	Presentation au-sim-ZRL-FCT-BMRK-r03.pdf
29 May 2007	Presentation au-sim-wadekar-adhoc-report-052907-v1.pdf
30 May 2007	Presentation au-pan-qcn-details-053007.pdf
30 May 2007	Presentation au_prabhakar_qcn_overview_geneva.pdf
14 Jun 2007	Presentation au-ZRL-Grand-Canal-r1.00.pdf
14 Jun 2007	Presentation au-wadekar-convergence-thoughts_v1.pdf
14 Jun 2007	Presentation au_prabhakar_qcn_with_drift.pdf
21 Jun 2007	Presentation au-prabhakar-shared-rls.pdf
21 Jun 2007	Presentation au-sim-ZRL-signaling-r1.02.pdf
21 Jun 2007	Presentation au-wadekar-practical-limitations-RL-v1.pdf
15 Jul 2007	Presentation au-kyoung-criteria-thoughts-0707.pdf
17 Jul 2007	Presentation au-prabhakar-qcn-scalability-transience.pdf
17 Jul 2007	Presentation au-roeck-simulation-results-071707.pdf
17 Jul 2007	Presentation au-sim-wadekar-adhoc-report-071707-v1.pdf
18 Jul 2007	Presentation au-ZRL-prelim-QCN-r1.01.pdf
18 Jul 2007	Presentation au-jain-congestion-principles-0707.pdf
18 Jul 2007	Presentation au-jain-fecn-multistage-hotspot-0707.pdf
26 Jul 2007	Presentation au-sim-groeck-simulation-results-qcn-0707.pdf
22 Aug 2007	Presentation au-sim-roeck-simulation-results-qcn-fbhat-0807.pdf
23 Aug 2007	Presentation au-prabhakar-improving-recovery-v1-1.pdf
23 Aug 2007	Presentation au-prabhakar-improving-recovery.pdf
05 Sep 2007	Presentation au-ZRL-triple-case-for-RTT-probing-r1.01.pdf
05 Sep 2007	Presentation au-bergamasco-qcn-problems-solutions-proposal-070905.pdf
05 Sep 2007	Presentation au-prabhakar-stockholm-improving-transience.pdf
05 Sep 2007	Presentation au-roeck-addressing-concerns-closed-loop-0907.pdf
05 Sep 2007	Presentation au-sim-roeck-complex-situations-0907.pdf
05 Sep 2007	Presentation au-wadekar-cm-nic-perspective-rev-1.0.pdf
06 Sep 2007	Presentation au-desanti-straw_poll_v4.pdf
06 Sep 2007	Presentation au-roeck-addressing-concerns-closed-loop-0907-v2.pdf
18 Oct 2007	Presentation au-roeck-qcn-sp-pseudocode-v1.0-0710.pdf
18 Oct 2007	Presentation au-wadekar-sept-2007-meeting-minutes-rev2.pdf
08 Nov 2007	Presentation au-prabhakar-sonar-part2.pdf
13 Nov 2007	Presentation au-roeck-complex-scenarios-1107.pdf
14 Nov 2007	Presentation au-prabhakar-sonar-fbpause-1107.pdf
06 Dec 2007	Presentation au-prabhakar-qcn-with-timer-0711.pdf
07 Dec 2007	Presentation au-rong-qcn-serial-hai-pseudo-code-0711.pdf
17 Dec 2007	Presentation au-rong-qcn-serial-hai-psuedo-code-0711.txt
20 Dec 2007	Presentation au-sim-rong-qcn-hai-simu1-0711.pdf
19 Mar 2008	Presentation au-nfinn-issues-0308-v2.pdf
19 Mar 2008	Presentation au-sim-kwan-qcn-tcp-0308.pdf
19 Mar 2008	Presentation au_prabhakar_qcn_evolution_summary.pdf
20 Mar 2008	Presentation au-atikoglu-prabhakar-tcp.pdf
05 Apr 2008	Presentation au-pan-qcn-serial-hai-2-1-0408.zip
21 Apr 2008	Presentation au-bestler-endstationrps-0408.pdf
24 Apr 2008	Presentation au-atikoglu-prabhakar-newreno.pdf
13 May 2008	Presentation au-nfinn-D1-ballot-issues-0508-v01.pdf
14 May 2008	Presentation au-nfinn-D1-ballot-issues-0508-v02.pdf
15 May 2008	Presentation au-bestler-endstationrps-0508-v02.pdf
29 May 2008	Presentation au-nfinn-RPID-0508-v01.pdf
05 Jun 2008	Presentation au-nfinn-RPID-0508-v02.pdf
16 Jun 2008	Presentation au-bestler-endstationrps-0608-03.pdf
15 Jul 2008	Presentation au-bestler-endstationrps-0708-04.pdf
15 Jul 2008	Presentation au-prabhakar-qcn-model-07-15.pdf
15 Jul 2008	Presentation au-prabhakar-qcn-tcp-07-15.pdf
16 Jul 2008	Presentation au-bestler-endstationrps-0708-05.pdf
16 Jul 2008	Presentation au-nfinn-RPID-0508-v03.pdf
17 Jul 2008	Presentation au-crupnicoff-AFID-0708-v1.pdf
17 Jul 2008	Presentation au-gusat-feedback-request-0708.pdf
13 Aug 2008	Presentation au-bestler-cffid-0808-01.ppt
14 Aug 2008	Presentation au-bestler-cffid-0808-01.pdf
20 Aug 2008	Presentation au-bestler-flowidoptions-0808-01.pdf
28 Aug 2008	Presentation au-gusat-dcn-monitoring-fb-rq-0808-v11.pdf
28 Aug 2008	Presentation au-gusat-dcn-monitoring-fb-rq-0808-v11.ppt
14 Sep 2008	Presentation au-ghanwani-rpid-0908-v1.pdf
16 Oct 2008	Presentation au-prabhakar-ave-principle-1016.pdf
09 Nov 2008	Presentation au-nfinn-draft-1-3-issues-1108-v1.pdf
10 Nov 2008	Presentation au-nfinn-draft-1-3-issues-1108-v2.pdf
11 Nov 2008	Presentation au-ghanwani-flowid-1008-v1.pdf
11 Nov 2008	Presentation au-gusat-FbRq-v301.pdf
11 Nov 2008	Presentation au-gusat-FbRq-v302.pdf
11 Nov 2008	Presentation au-wadekar-nic-teaming-1108-v1.pdf
12 Nov 2008	Presentation au-rong-rate-limiter-installation-1108.pdf
18 May 2009	Presentation au-kabbani-yasuda-0509-HW_implementation_evaluation.pdf
18 May 2009	Presentation au-yasuda-kabbani-0509-HW_implementation.pdf
13 Jul 2009	Presentation au-nfinn-pbb-0709-v01.pdf
14 Jul 2009	Presentation au-lipshteyn-diffQCN-0709-v01.ppt
16 Jul 2009	Presentation au-thaler-cnm-through-pbb-0709.pdf
08 Sep 2009	Presentation au-lipshteyn-diffQCN-0909-v01.ppt
16 Nov 2009	Presentation au-yasuda-10G-QCN-Implementation-1109.pdf