IETF Proceedings

The Deterministic Networking (DetNet) Working Group focuses on
deterministic data paths that operate over Layer 2 bridged and Layer 3
routed segments, where such paths can provide bounds on latency, loss,
and packet delay variation (jitter), and high reliability. The Working
Group addresses Layer 3 aspects in support of applications requiring
deterministic networking. The Working Group collaborates with IEEE802.1
Time Sensitive Networking (TSN), which is responsible for Layer 2
operations, to define a common architecture for both Layer 2 and Layer
3. Example applications for deterministic networks include professional
and home audio/video, multimedia in transportation, engine control
systems, and other general industrial and vehicular applications being
considered by the IEEE 802.1 TSN Task Group.

The Working Group will initially focus on solutions for networks that
are under a single administrative control or within a closed group of
administrative control; these include not only campus-wide networks but
also can include private WANs. The DetNet WG will not spend energy on
solutions for large groups of domains such as the Internet.

The Working Group will specify an overall architecture that encompasses
the data plane, OAM (Operations, Administration, and Maintenance), time
synchronization, management, control, and security aspects which are
required to enable a multi-hop path, and forwarding along the path, with
the deterministic properties of controlled latency, low packet loss, low
packet delay variation, and high reliability. The work applies to
point-to-point (unicast) and point-to-multipoint (multicast) flows which
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 longer required. The work covers 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. Candidate Layer 3 data plane
technologies that may be used, without modification, include: IP and
MPLS, and Layer 2 encapsulations that run over IP and/or MPLS, such
as pseudowires and GRE.

The working group will document which deployment environments and types
of topologies are within (or outside) the scope of the DetNet
architecture. This work focuses on the data plane aspects and is
independent from any path setup protocol or mechanism. The data plane
will be compatible with the work done in IEEE802.1 TSN.

The Working Group's scope explicitly excludes modifications of transport
protocols, OAM, Layer 3 forwarding, encapsulations, and control plane
protocols.

DetNet is chartered to work in the following areas:

Overall architecture: This work encompasses the data plane, OAM,
time synchronization, management, control, and security aspects.

Data plane: This work will document how to use IP and/or MPLS to
support a data plane method of flow identification and packet
forwarding over Layer 3.

Data flow information model: This work will identify the information
needed for flow establishment and control and be used by
reservation protocols and YANG data models. The work will be
independent from the protocol(s) used to control the flows
(e.g. YANG+NETCONF/RESTCONF, PCEP or GMPLS).

YANG models: This work will document 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. Control plane related information will be
independent from the protocol(s) which may be used to advertise
this information (e.g. IS-IS or GMPLS extensions). Any new YANG
models will be coordinated with the Working Groups that define
any augmented base models.

As needed, problem statement: This effort will establish the
deployment environment and deterministic network requirements.

As needed, vertical requirements: This effort will detail the
requirements for deterministic networks in various industries, for
example, professional audio, electrical utilities, building
automation systems, wireless for industrial applications.

To investigate whether existing data plane encryption mechanisms can
be applied, possibly opportunistically, to improve security and
privacy.

The WG coordinates with other relevant IETF Working Groups, including
CCAMP, PCE, PALS, TEAS, OSPF, IS-IS, 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).

WG deliverables include:
Overall architecture
Data plane specification
Data flow information model
YANG models

WG sustaining/informational documents may include:

These documents may 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 and (constrained) deployment environments
User-driven use cases