[Detnet] New Liaison Statement, "Liaison on IEEE 802.1 TSN projects to the IETF DetNet WG"

Liaison Statement Management Tool <statements@ietf.org> Mon, 27 November 2023 15:46 UTC

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From: Liaison Statement Management Tool <statements@ietf.org>
To: János Farkas <janos.farkas@ericsson.com>, Lou Berger <lberger@labn.net>
Cc: János Farkas <janos.farkas@ericsson.com>, Andrew Alston <andrew-ietf@liquid.tech>, Deterministic Networking Discussion List <detnet@ietf.org>, Glenn Parsons <glenn.parsons@ericsson.com>, Jim Guichard <james.n.guichard@futurewei.com>, John Messenger <JMessenger@advaoptical.com>, John Scudder <jgs@juniper.net>, Lou Berger <lberger@labn.net>, Paul Nikolich <p.nikolich@ieee.org>, liaison-coordination@iab.org
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Date: Mon, 27 Nov 2023 07:46:30 -0800
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Subject: [Detnet] New Liaison Statement, "Liaison on IEEE 802.1 TSN projects to the IETF DetNet WG"
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Title: Liaison on IEEE 802.1 TSN projects to the IETF DetNet WG
Submission Date: 2023-11-27
URL of the IETF Web page: https://datatracker.ietf.org/liaison/1882/

From: Glenn Parsons <glenn.parsons@ericsson.com>
To: Lou Berger <lberger@labn.net>,János Farkas <janos.farkas@ericsson.com>
Cc: János Farkas <janos.farkas@ericsson.com>,Jim Guichard <james.n.guichard@futurewei.com>,Andrew Alston <andrew-ietf@liquid.tech>,Lou Berger <lberger@labn.net>,John Scudder <jgs@juniper.net>,Deterministic Networking Discussion List <detnet@ietf.org>
Response Contacts: Paul Nikolich <p.nikolich@ieee.org>,Glenn Parsons <glenn.parsons@ericsson.com>,John Messenger <JMessenger@advaoptical.com>
Technical Contacts: 
Purpose: For information

Body: We would like to inform you about our current projects that might be most relevant for your ongoing
work on enhanced DetNet data plane.

The IEEE P802.1DC “Quality of Service Provision by Network Systems” project
(https://1.ieee802.org/tsn/802-1dc/) specifies procedures, managed objects, and YANG modules for
Quality of Service (QoS) features specified in IEEE Std 802.1Q, such as per-stream filtering and policing,
queuing, transmission selection, flow control and frame preemption, in a network system that is not a
bridge. IEEE Std 802.1Q specifies QoS features for bridges; however, these features are perfectly
applicable to other devices, e.g., end stations, routers, e.g., DetNet routers. In IEEE Std 802.1Q, the
specifications of these features are scattered, and coupled tightly to the operation of a bridge. IEEE
P802.1DC provides simple reference points to the IEEE Std 802.1Q QoS specifications that are usable for
non-bridge systems, and for managed objects for these features that are not specific to bridges. A list of
TSN QoS features provided in Table 9-2 in IEEE P802.1DC. IEEE P802.1DC is at IEEE Standards
Association ballot.

The IEEE P802.1Qdv “Enhancements to Cyclic Queuing and Forwarding” project
(https://1.ieee802.org/tsn/802-1qdv/) specifies procedures, protocols and managed objects to enhance
Cyclic Queuing and Forwarding, comprising: a transmission selection procedure that organizes frames in
a traffic class output queue into logical bins that are output in strict rotation at a constant frequency; a
procedure for storing received frames into bins based on the time of reception of the frame; a procedure
for storing received frames into bins based on per-flow octet counters; a protocol for determining the
phase relationship between a transmitter’s and a receiver’s bin boundaries in time; managed objects,
Management Information Base (MIB), and YANG modules for controlling these procedures; and an
informative annex to provide guidance for applying these procedures. This amendment also addresses
errors and omissions in the description of existing IEEE Std 802.1Q functionality. The existing Cyclic
Queuing and Forwarding (CQF) functionality in IEEE Std 802.1Q provides bounded end-to-end delays,
allows simple delay analysis methods, and does not depend on per-flow state. These properties are critical
for scaling up Time-Sensitive Networking to large networks with a high number of simultaneous flows,
such as service provider networks. This amendment extends the existing CQF functionality to support
long physical links with high delay, processing delay variations in bridges, non-time-synchronized ingress
traffic, and/or flows with a wider range of latency requirements. These properties enhance the suitability
of CQF for large networks. The time-based bin filling provides for synchronized time division
multiplexing (TDM). The count-based bin filling (“paternoster”) provides ingress to a TDM domain and
provides the QoS between TDM domains. In addition, count-based bin filling without synchronized
clocks provides very low latency variation, which improves scaling when aggregating flows. IEEE
P802.1Qdv is at Task Group ballot.

We look forward to continued collaboration between our groups.