A new IETF WG has been formed in the Operations and Management Area. For
additional information, please contact the Area Directors or the WG Chairs.

Getting Ready for Energy-Efficient Networking (green)
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Current status: BOF WG

Chairs:
  Diego Lopez <[email protected]>
  Robert Wilton <[email protected]>

Assigned Area Director:
  Mahesh Jethanandani <[email protected]>

Operations and Management Area Directors:
  Warren Kumari <[email protected]>
  Mahesh Jethanandani <[email protected]>

Mailing list:
  Address: [email protected]
  To subscribe: https://mailman3.ietf.org/mailman3/lists/green.ietf.org/
  Archive: https://mailarchive.ietf.org/arch/browse/green/

Group page: https://datatracker.ietf.org/group/green/

Charter: https://datatracker.ietf.org/doc/charter-ietf-green/

#Background and Motivation

Energy efficiency gains for communication systems are highly sought after for
environmental, business, and technical reasons. Network operators seek tools
and solutions to understand and manage the energy consumption of components,
devices, and services across their networks, and support a robust and
comprehensive energy efficiency strategy.

An energy-efficient network involves deploying and managing network
infrastructures to optimize energy use on network devices while achieving the
network’s functional and performance requirements by improving overall
network utilization. This includes adopting management plane technologies to
monitor and manage energy consumption, evaluating the effectiveness of
energy-aware policies beyond simply reducing consumption, and implementing
management strategies that enhance overall energy efficiency in network
operations.

The EMAN Working Group previously worked on a closely related technology
area, but the standards didn’t achieve wide industry adoption, and as
illustrated in RFC 9547, the absence of standardized interfaces for
measuring, reporting, and managing energy consumption across diverse network
setups remains a significant challenge.

#Goals and Scope

The GREEN Working Group will examine the EMAN work to re-use where applicable
but also consider updated operator input and requirements over those
previously documented in RFC 6988. Similarly, it will examine the framework
previously described in RFC 7326.

It will develop new data models, specified in YANG rather than as MIBs.

It is necessary to support heterogeneous deployment where energy-related
statistics and management may be provided via other models and mechanisms.
Guidance will be provided to operators in these heterogeneous environments to
cover the incremental deployment of energy-efficient features in both network
devices and the management of energy-efficient networks.

The GREEN Working Group is chartered to explore use cases, derive
requirements, and provide solutions for identifying and characterizing energy
efficiency metrics, methods related to energy consumption of network devices,
and optimizing energy efficiency across the network. The Working Group will
concentrate on the following:

- Collecting and updating requirements for the management of energy-efficient
networks. - Defining use cases for managing energy-efficient networks. -
Defining terms and definitions related to energy efficiency metrics. Where
possible, terms and definitions in existing RFCs will be reused. - Developing
YANG models to enable measuring and reporting of energy usage through metrics
and attributes at component, device, and network levels. - Providing YANG
models to allow operators to optimize energy usage in network components,
devices, and across the network, via configurable energy efficiency
capabilities. - Developing or selecting a framework for energy efficiency
monitoring, energy efficiency capability discovery, and management within a
network domain.

Initially, the GREEN Working Group is expected to focus on simple
foundational building blocks for new energy efficiency strategies for
operators, such as the work items listed below, striving to illustrate
industry implementation and adoption of the working group output before
potentially considering more complex aspects of energy-efficient networks in
a future charter.

#Out of Scope

To stay focused, the Working Group will not address energy-related issues in
every networking area. Some topics are already covered in other venues while
others may not be mature enough or present major shortcomings (e.g., have
well-documented but unresolved security threats). The following topics are
not currently within the scope of the Working Group:

- Regulatory, compliance, and corporate responsibility-related matters.
- Routing protocols and algorithms, including those that consider energy
factors. - Methodologies for understanding the impact of energy efficiency
optimization on service quality. - Methodologies for assessing environmental
sustainability and related performance for the network devices. - The carbon
accounting and reporting protocol to measure, manage, and report greenhouse
gas emissions and other sustainability-related data such as renewable energy
data. - Metadata formats for renewable energy or carbon-related data within
the energy-efficient network's management system.

#Work Items

The GREEN Working Group will initially focus on the following deliverables:

- Informational document(s) that (1) defines common terminology and metric
definitions, (2) categorizes various types of metrics and measurements at
component, device, and network levels. - Standard Track definitions of YANG
data models at the component level, device level, and network level for
energy-efficient network management including energy usage monitoring and
energy consumption management. - Informational document(s) that (1) defines a
set of architectural components for managing energy-efficient networks and
(2) describes incremental deployment considerations for new energy efficiency
metrics monitoring and capability discovery, and management within a network
domain.

#Dependencies and Liaisons

**The GREEN Working Group will collaborate with:**

- Other IETF Working Groups that address topics related to power consumption
observability and energy efficiency management, such as IVY, OPSAWG, NETMOD,
TVR, and INTAREA. - Working Groups that might have related work or expertise
with defining and standardizing metrics, measurement frameworks, and
benchmarking methodology (e.g., IPPM and BMWG). - The IAB e-impact program to
identify short-term metrics-related work and propose longer-term problems for
further study.

**The GREEN Working Group will also liaise with other SDOs on benchmarking
methodologies related to power management, mainly:**

- The European Telecommunications Standards Institute (ETSI), particularly
the Technical Committee of Environment Engineering (TCEE). - The
International Telecommunication Union (ITU), specifically with ITU-T-SG-5. -
3GPP, specifically SA-5.

Milestones:

  Jun 2025 - Adopt a standardized set of terminologies and definitions
  related to energy efficient metrics.

  Dec 2025 - Adopt YANG models to enable measuring, reporting, and management
  of energy usage at a component, device and network level.

  Jun 2026 - Adopt a framework for energy efficient monitoring, capability
  discovery, and management within a network domain.



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