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Version 5.4.0, 2014-04-22
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Routing Over Low power and Lossy networks (roll)

Charter for Working Group


Low power and Lossy networks (LLNs) are made up of many
embedded devices with limited power, memory, and processing
resources. They are interconnected by a variety of links, such as
IEEE 802.15.4, Bluetooth, Low Power WiFi, wired or other low
power PLC (Powerline Communication) links. 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.

Generally speaking, LLNs have at least five distinguishing
characteristics:
- LLNs operate with a hard, very small bound on state.
- In most cases, LLN optimize for saving energy.
- Typical traffic patterns are not simply unicast flows (e.g. in some
cases most if not all traffic can be point to multipoint).
- In most cases, LLNs will be employed over link layers with
restricted frame-sizes, thus a routing protocol for LLNs should be
specifically
adapted for such link layers.
- LLN routing protocols have to be very careful when trading off
efficiency for generality; many LLN nodes do not have resources to
waste.

These specific properties cause LLNs to have specific routing
requirements.

Existing routing protocols such as OSPF, IS-IS, AODV, and OLSR have
been evaluated by the working group and have in their current form been
found to not satisfy all of these specific routing requirements.

The Working Group is focused on routing issues for LLN.

There is a wide scope of application areas for LLNs, including
industrial monitoring, building automation (HVAC, lighting, access
control,
fire), connected homes, healthcare, environmental monitoring, urban sensor
networks (e.g. Smart Grid), asset tracking. The Working Group focuses
on routing solutions for a subset of these: industrial, connected
home, building and urban sensor networks for which routing requirements have
been specified. These application-specific routing requirement
documents will be used for protocol design.

The Working Group focuses only on IPv6 routing architectural framework
for these application scenarios. 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 pay particular attention to routing security
and manageability (e.g., self routing 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
upper-layer applications utilizing LLNs define appropriate mechanisms.
The solution must include unicast and multicast considerations.

Work Items:

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

- Provide an architectural framework for routing and path selection at
Layer 3 (Routing for LLN Architecture) that addresses such issues as
whether LLN routing 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.

- Protocol work: The Working Group will consider specific routing
requirements from the four application documents collectively, and
specify either
a new protocol or extend an existing routing protocol in cooperation
with the
relevant Working Group.
If requirements from the four target application areas cannot be met
with a single protocol, the WG may choose to specify or extend more than
one
protocol (this will require a recharter of the WG).

- Documentation of applicability statement of ROLL routing protocols.

Milestones

Done
Submit Routing requirements for Industrial applications to the IESG to be considered as an Informational RFC.
Done
Submit Routing requirements for Connected Home networks applications to the IESG to be considered as an Informational RFC.
Done
Submit Routing requirements for Building applications to the IESG to be considered as an Informational RFC.
Done
Submit Routing requirements for Urban networks applications to the IESG to be considered as an Informational RFC.
Done
Submit Security Framework to the IESG to be considered as an Informational RFC
Done
Submit Routing metrics for LLNs document to the IESG to be considered as a Proposed Standard.
Done
Submit first draft of ROLL routing protocol specification as Proposed Standard.
Done
Submit the ROLL routing protocol specification to the IESG as Proposed Standard.
Done
Submit first draft of RPL threat analysis to the IESG to be considered as an Informational RFC
Done
WG to adopt RPL applicability statement Home for Automation applications
draft-ietf-roll-applicability-home-building
Done
WG to adopt RPL applicability statement(s) for AMI networks
draft-ietf-roll-applicability-ami
Done
WG to adopt RPL applicability statement for Industrial applications
draft-ietf-roll-rpl-industrial-applicability
Done
WG to adopt reviewed template for applicability statements
draft-ietf-roll-applicability-template
Done
Resolve question of whether to keep this in roll or 6tisch
draft-ietf-roll-rpl-industrial-applicability
Jan 2014
submit REVISED thread-analysis document based upon security directorate review to IESG.
draft-ietf-roll-security-threats
Feb 2014
Submit first draft of RPL applicability statement for Home Automation applications to the IESG to be considered as an Informational RFC
Jun 2014
Evaluate WG progress, recharter or close