P802.1Qcz – Congestion Isolation

This amendment specifies protocols, procedures and managed objects that support the isolation of congested data flows within data center environments. This is achieved by enabling systems to individually identify flows creating congestion, adjust transmission selection for frames of those flows, and signal to neighbors. This mechanism reduces head-of-line blocking for uncongested flows sharing a traffic class in lossless networks. Congestion Isolation is intended to be used with higher layer protocols that utilize end-to-end congestion control in order to reduce packet loss and latency. This amendment also addresses errors and omissions in the description of existing functionality.

There is significant customer interest and market opportunity for large scale, low-latency, lossless Ethernet data centers to support high-performance computing and distributed storage applications. Congestion is the primary cause of loss and delay. These environments currently use higher layer end-to-end congestion control coupled with priority-based flow control at Layer 2 to avoid performance degradation from packet loss due to congestion. As the Ethernet data center network scales in size, speed and number of concurrent flows, the current environment creates head-of-line blocking for flows sharing the same traffic class. Isolating flows that cause congestion reduces latency for flows not causing congestion and improves the scale and performance of the Ethernet data center network. This amendment will support the identification and isolation of the higher layer protocol flows that are creating congestion. The amendment will interoperate with existing congestion management. Use of a consolidated Ethernet data center network will realize operational and equipment cost benefits..

Current Status

Status Working Group ballot
Current Draft D1.3
PAR & CSD Full title: Draft Standard for Local and Metropolitan Area Networks — Bridges and Bridged Networks — Amendment: Congestion Isolation
PAR (Approved: 27 Sep 2018; Expires: 31 Dec 2022)
CSD
Editor Paul Congdon

Archive

Date Document
14 September 2020 802.1Qcz, Draft 1.3: Comment Disposition
11 September 2020 802.1Qcz, Draft 1.3: Proposed Comment Disposition v1
11 August 2020 802.1Qcz, Draft 1.3
10 August 2020 802.1Qcz, Draft 1.2: Comment Disposition
07 August 2020 802.1Qcz, Draft 1.2: Proposed Comment Disposition v1
16 July 2020 802.1Qcz, Draft 1.2
13 July 2020 802.1Qcz, Draft 1.1: Comment Disposition
29 June 2020 802.1Qcz, Draft 1.1: Proposed Comment Disposition v2
28 June 2020 802.1Qcz, Draft 1.1: Proposed Comment Disposition v1
2 June 2020 802.1Qcz, Draft 1.1
21 May 2020 802.1Qcz, Draft 1.0: Comment Disposition
19 May 2020 802.1Qcz, Draft 1.0: Proposed Comment Disposition v2
18 May 2020 802.1Qcz, Draft 1.0: Proposed Comment Disposition v1
15 April 2020 802.1Qcz, Draft 1.0
16 March 2020 802.1Qcz, Draft 0.6: Comment Disposition
14 March 2020 802.1Qcz, Draft 0.6: Proposed Comment Disposition v1
24 February 2020 802.1Qcz, Draft 0.6
13 February 2020 802.1Qcz, Draft 0.5: Comment Disposition
08 February 2020 802.1Qcz, Draft 0.5: Proposed Comment Disposition v3
25 January 2020 802.1Qcz, Draft 0.5: Proposed Comment Disposition v2
18 January 2020 802.1Qcz, Draft 0.5: Proposed Comment Disposition v1
12 December 2019 802.1Qcz, Draft 0.5
14 October 2019 802.1Qcz, Draft 0.3: Comment Disposition
07 October 2019 802.1Qcz, Draft 0.3: Proposed Comment Disposition v3
18 September 2019 802.1Qcz, Draft 0.3: Proposed Comment Disposition v2
17 September 2019 802.1Qcz, Draft 0.3: Proposed Comment Disposition v1
30 August 2019 802.1Qcz, Draft 0.3
15 July 2019 802.1Qcz, Draft 0.2
15 May 2019 802.1Qcz, Draft 0.0

The above list includes only the latest version of (proposed) dispositions. See the project folder for a complete list). The dates listed are the website file dates; they may differ from the creation dates in the documents.

Contributions

Important NOTICE on contributions.

Date Document
22 May 2019 Initial draft review
(cz-congdon-d0-0-status-0519-v01.pdf)
11 March 2019 Text contribution
(cz-congdon-draft-text-contribution-0319-v01.pdf)
12 Sep 2018 Proposed Technical Approach Congestion Isolation
(cz-congdon-ci-approach-0918-v01.pdf)
09 Jul 2018 Congestion Isolation update
(cz-congdon-ci-update-0718-v1.pdf)
09 Jul 2018 P802.1Qcz interworking with other data center technologies
(cz-escudero-sahuquillo-ci-internetworking-0718-v1.pdf)
10 Jun 2018 P802.1Qcz Changes to 802.1Q
(cz-congdon-ci-Q-changes-0618-v1.pdf)
24 May 2018 New Simulation Results of Congestion Isolation
(cz-sun-ci-simulation-update-0518-v01.pdf)
24 May 2018 Need For Advanced Congestion Mitigation In Modern Networks
(cz-gafni-ci-need-0518-v1.pdf)
21 May 2018 Responses to Qcz analysis in March
(cz-escuderosahuquillo-CIAnalysis-response-0518-v01.pdf)
21 May 2018 Congestion Isolation update
(cz-congdon-ci-update-0518-v1.pdf)
16 Apr 2018 Congestion Isolation review
(cz-congdon-congestion-isolation-review-0418-v1.pdf)

The above list includes only the latest version of updated documents and omits those superseded by subsequent discussion or inclusion in the current draft (see filenames beginning “cz-” in the 2018 and 2019 public directories for a complete list). The dates listed are the website file dates; they may differ from the creation dates in the documents.

Please contact the Editor if you have comments to the TSN TG page.

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