2.6.9 Routing Over Low power and Lossy networks (roll)

NOTE: This charter is a snapshot of the 71st IETF Meeting in Philadelphia, PA USA. It may now be out-of-date.

Last Modified: 2008-02-15


JP Vasseur <jpv@cisco.com>
David Culler <culler@eecs.berkeley.edu>

Routing Area Director(s):

Ross Callon <rcallon@juniper.net>
David Ward <dward@cisco.com>

Routing Area Advisor:

David Ward <dward@cisco.com>

Mailing Lists:

General Discussion: roll@ietf.org
To Subscribe: http://www.ietf.org/mailman/listinfo/roll
Archive: http://www.ietf.org/mail-archive/web/roll/

Description of Working Group:

Low power and Lossy networks (LLNs) are typically composed of many
embedded devices with limited power, memory, and processing resources
interconnected by a variety of links, such as IEEE 802.15.4, Bluetooth,
Low Power WiFi. LLNs are transitioning to an end-to-end IP-based
solution to avoid the problem of non-interoperable networks
interconnected by protocol translation gateways and proxies. In
addition, LLNs have specific routing requirements that may not be met by
existing routing protocols, such as OSPF, IS-IS, AODV and OLSR. For
example path selection must be designed to take into consideration the
specific power capabilities, attributes and functional characteristics
of the links and nodes in the network.

There is a wide scope of application areas for LLNs, including
industrial monitoring, building automation (HVAC, lighting, access
control, fire), connected home, healthcare, environmental monitoring,
urban sensor networks sensor networks, assets tracking, refrigeration.
The Working Group will only focus on routing solutions for a subset of
these. It will focus on  industrial, connected home/building and urban
sensor networks and it will  determine the routing requirements for
these scenarios.

The Working Group will provide an IPv6 only routing architectural
framework for these application scenarios. Given the transition of this
technology to  IP, at this time it is believed that an IPv4 solution is
not necessary. The Framework will take into consideration various
aspects including high reliability in the presence of time varying loss
characteristics and connectivity while permitting low-power operation
with very modest memory and CPU pressure in networks potentially
comprising a very large number (several thousands) of nodes.

The Working Group will explore aspects of mobility within a single LLN
(if any) in the routing requirement creation.

The Working Group will pay particular attention to routing security and
manageability (e.g., self configuration) issues. It will also need to
consider the transport characteristic the routing protocol messages will
experience. Mechanisms that protect an LLN from congestion collapse or
that establish some degree of fairness between concurrent communication
sessions are out of scope of the Working Group. It is expected that
applications utilizing LLNs define appropriate mechanisms.

Work Items:

- Produce routing requirements documents for Industrial, Connected
Home, Building and urban sensor networks. Each document will describe
the use case and the associated routing protocol requirements. The
documents will progress in collaboration with the 6lowpan Working Group
(INT area).

- Survey the applicability of existing protocols to LLNs. The aim of
this document will be to analyze the scaling and characteristics of
existing protocols and identify whether or not they meet the routing
requirements of the applications identified above. Existing IGPs, MANET,
NEMO, DTN routing protocols will be part of evaluation.

- Specification of routing metrics used in path calculation. This
includes static and dynamic link/node attributes required for routing in

- Provide an architectural framework for routing and path selection at
Layer 3 (Routing for LLN Architecture) that addresses such issues as
whether LLN routing protocols require a distributed and/or centralized
path computation models, whether additional hierarchy is necessary and
how it is applied. Manageability will be considered with each approach,
along with various trade-offs for maintaining low power operation,
including the presence of non-trivial loss and networks with a very
large number of nodes.

- Produce a routing security framework for routing in LLNs.

Goals and Milestones:

Jul 2008  Submit Routing requirements for Industrial applications to the IESG to be considered as an Informational RFC.
Jul 2008  Submit Routing requirements for Connected Home networks applications to the IESG to be considered as an Informational RFC.
Jul 2008  Submit Routing requirements for Building applications to the IESG to be considered as an Informational RFC.
Jul 2008  Submit Routing requirements for Urban networks applications to the IESG to be considered as an Informational RFC.
Nov 2008  Submit Routing metrics for LLNs document to the IESG to be considered as a Proposed Standard.
Feb 2009  Submit Protocol Survey to the IESG to be considered as an Informational RFC.
Apr 2009  Submit Security Framework to the IESG to be considered as an Informational RFC
May 2009  Submit the Routing for LLNs Architecture document to the IESG as an Informational RFC.
Jun 2009  Recharter or close.

No Current Internet-Drafts

No Request For Comments

Meeting Minutes


1-2 ROLL-WG-Meeting
3- Home Automation Routing Requirement
4- Industrial Routing Requirements
5- Urban WSNs Routing Requirements in LLN
6- Overview of Existing Routing Protocols for LLN