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 |
Standards Association ballot |
| Current Draft |
D2.7 |
| 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 2024)
CSD |
| Editor |
Paul Congdon |
Archive
| Date |
Document |
| 14 March 2023 |
802.1Qcz, Draft 2.7: Final Comment Disposition v1 |
| 22 February 2023 |
802.1Q Rolled up with 802.1Qcz Draft 2.7 |
| 22 February 2023 |
802.1Qcz, Draft 2.7 |
| 20 February 2023 |
802.1Qcz, Draft 2.5: Comment Disposition v1 |
| 19 February 2023 |
802.1Qcz, Draft 2.5: Proposed Comment Disposition v1 |
| 18 February 2023 |
802.1Q Rolled up with 802.1Qcz Draft 2.6 |
| 18 February 2023 |
802.1Qcz, Draft 2.6 |
| 31 January 2023 |
802.1Qcz, Draft 2.5 |
| 30 January 2023 |
802.1Qcz, Draft 2.4: Comment Disposition v1 |
| 25 January 2023 |
802.1Qcz, Draft 2.4: Proposed Comment Disposition v3 |
| 20 January 2023 |
802.1Qcz, Draft 2.4: Proposed Comment Disposition v2 |
| 19 December 2022 |
802.1Qcz, Draft 2.4: Proposed Comment Disposition v1 |
| 21 November 2022 |
802.1Qcz, Draft 2.4 |
| 13 November 2022 |
802.1Qcz, Draft 2.3: Comment Disposition v1 |
| 13 November 2022 |
802.1Qcz, Draft 2.3: Proposed Comment Disposition v1 |
| 29 September 2022 |
802.1Qcz, Draft 2.3 |
| 08 April 2022 |
802.1Qcz, Draft 2.2 |
| 18 January 2022 |
802.1Qcz, Draft 2.1: Comment Disposition v1 |
| 10 January 2022 |
802.1Qcz, Draft 2.1: Proposed Comment Disposition v1 |
| 23 March 2021 |
802.1Qcz, Draft 2.1 |
| 14 December 2021 |
802.1Qcz, Draft 2.0: Comment Disposition v2 |
| 12 March 2021 |
802.1Qcz, Draft 2.0: Comment Disposition v1 |
| 08 March 2021 |
802.1Qcz, Draft 2.0: Proposed Comment Disposition v2 |
| 07 March 2021 |
802.1Qcz, Draft 2.0: Proposed Comment Disposition v1 |
| 15 January 2021 |
802.1Qcz, Draft 2.0 |
| 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.
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.
