* WGs marked with an * asterisk has had at least one new draft made available during the last 5 days

detnet: "deterministic networking"

DetNet BoF Agenda For IETF 93

MONDAY, July 20, 2015 1300-1500 Afternoon Session I Location: Grand Hilton Ballroom

PresentationStart Time Information
0 13:00 Title: Administrivia & Intro
Presenter: Chairs
1 13:10 Title: User's view
Presenter: Jouni Korhonen, Pascal Thubert, Craig Gunther, Patrick Wetterwald, Subir Das
2 13:50 Title: DetNet Problem Statement (including example possible/plausible solutions)
Presenter: Norman Finn
3 14:10 Title: Working group scope and deliverables discussion
Presenter: Chair moderated
4 14:50 Title: Concluding discussion & polling
Presenter: Chairs
Adjourn 15:00

Background

Operational Technology (OT) refers to industrial networks that are typically used for monitoring systems and supporting control loops, as well as movement detection systems for use in process control (i.e., process manufacturing) and factory automation (i.e., discrete manufacturing). Due to its different goals, OT has evolved in parallel but in a manner that is radically different from Information Technology/Information? and Communications Technology (IT/ICT), focusing on highly secure, reliable and deterministic networks, with limited scalability over a bounded area. Deterministic networks are characterized as having a bounded latency, very low loss, and a very narrow jitter.

In parallel, the need for determinism in professional and home audio/video markets drove the formation of the Audio/Video Bridging (AVB) standards efforts in IEEE 802.1. With the demand for connectivity and multimedia in transportation, AVB is being evaluated for application in vehicle head units, rear seat entertainment modules, amplifiers, camera modules, and engine control systems. Automotive AVB networks share the OT requirements for extremely low packet loss rates, guaranteed finite latency, and low jitter.

This wider application scope for deterministic networks has led to the IEEE 802.1 AVB Task Group becoming the Time-Sensitive Networking (TSN) Task Group (TG), covering industrial and vehicular applications. The networks in consideration are extending beyond the LAN boundaries and require deterministic forwarding and connectivity over a Layer 2/Layer 3 network. The properties of deterministic networks will have specific requirements for the use of routed networks to support these applications.

Draft WG description

The deterministic networking Working Group (detnet) will focus on the establishment and maintenance of deterministic paths over Layer-2 Bridged and Layer-3 routed segments. The Working Group will focus on Layer 3 aspects in support of deterministic applications. The group will collaborate with IEEE802.1TSN, which is responsible for Layer-2 operations, to define a common architecture to support IEEE802.1TSN applications. For the common architecture, a number of elements such as the IEEE802.1TSN host operation should be agnostic to the choice of network used for the connectivity.

The Working Group will specify an overall architecture that encompasses the data plane, OAM, management, control, and security aspects that are required to enable a multi-hop path, and forwarding along that path, with the deterministic properties of controlled latency, low packet loss, ultra-low jitter, and high reliability. The work will apply to flows that can be characterized in a manner that allows the network to 1) reserve the appropriate resources for the flows in advance, and 2) release/reuse the resources when they are no more required. The work will cover the characterization of flows, the encapsulation of frames, the required forwarding behaviors, as well as the state that may need to be established in intermediate nodes; it will not include end-to-end considerations such as transport protocols. Candidate Layer 3 data plane technologies include: IPv4, IPv6, MPLS. This work focuses on the data plane and does not depend on the path setup protocol that will be used. The data plane will be compatible with the work done in IEEE801.1TSN.

The WG will coordinate with other relevant IETF Working Groups, including CCAMP, PCE, PALS, TEAS, TSVWG, and 6TisSCH. As the work progresses, requirements may be provided to the responsible Working Group, e.g. PCE, TEAS, and CCAMP, with detnet acting as a focal point to maintain the consistency of the overall architecture. The WG will liaise with appropriate groups in IEEE and other Standards Development Organizations (SDOs).

Work Items

Deliverables (as standard track or informational RFCs)

  

  • Overall architecture: This document encompasses the data plane, OAM, management, control, and security aspects.
  • Data plane specification: Document a data plane method of flow identification and packet forwarding over Layer 3.
  • Data flow information model: This document will be for use by a flow reservation protocol or by YANG data models. The model should be independent from the protocol(s) used to control the flows (e.g. PCEP or GMPLS).
  • Identification of additional YANG augmentations: This document will cover device and link capabilities (feature support) and resources (e.g. buffers, bandwidth) for use in device configuration and status reporting. Such information may also be used when advertising the deterministic network elements to a control plane. The model should be independent from the protocol(s) that may be used to advertise this information (e.g. ISIS or GMPLS extensions). This deliverable will be coordinated with the working groups that define the base models.

WG sustaining documents

(These documents will not necessarily be published, but may be maintained in a draft form or on a collaborative Working Group wiki to support the efforts of the Working Group and help new comers):

  • Problem statement: This document will identify the deployment environment and deterministic network requirements which need to be supported.

  • Vertical requirements: A number of documents will expose the requirements for deterministic networks in various industries, including, but not limited to, pro-audio and smartgrid.

Related Drafts

o Deterministic Networking Professional Audio Requirements

http://tools.ietf.org/html/draft-gunther-detnet-proaudio-req-01

o Deterministic networking for radio access networks

http://tools.ietf.org/html/draft-korhonen-detnet-telreq-00

o 6TiSCH requirements for DetNet

http://tools.ietf.org/html/draft-thubert-6tisch-4detnet-01

o Deterministic Networking Uitilities requirements

http://tools.ietf.org/html/draft-wetterwald-detnet-utilities-reqs-02

o Deterministic Networking Use Case in Mobile Network

http://tools.ietf.org/html/draft-zha-detnet-use-case-00

o Deterministic Networking Problem Statement

http://tools.ietf.org/html/draft-finn-detnet-problem-statement-03

o Deterministic Networks Gap Analysis

http://tools.ietf.org/html/draft-dujovne-detnet-gap-analysis-00

o Deterministic Networking Architecture

http://tools.ietf.org/html/draft-finn-detnet-architecture-01