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.

RFC7102 discusses ROLL specific aspects of LLNs, and RFC7228 provides 
additional terminology for constrained devices. RFC 5548, 5673, 5826, 
and 5876 describe the requirements for LLNs from several application 
perspectives.

The Working Group has focused on routing solutions for the areas: 
connected home, building, and urban sensor networks. It has developed a 
Framework that takes 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 continues to focus on routing issues for LLN and to 
maintain, improve and streamline the protocols already developed, 
including RPL and MPL. The focus is on IPv6 work only. The Working Group 
will pay particular attention to routing security and manageability 
(e.g., self-configuration) issues. The working group will consider the 
transport characteristics that routing protocol messages will 
experience.

ROLL will coordinate closely with the working groups in other areas that 
focus on constrained networks and/or constrained nodes, such as 6lo, 
6tisch, ipwave, lwig and CoRE. Other working groups such as pim, bier 
and manet will be consulted as needed. The Working group will align with 
the 6man WG when needed.

Work Items are:

- Protocol elements to enhance parent node selection and improve route 
  discovery efficiency

- Network resilience and fault management in RPL-based networks

- Secure network enrollment and access control mechanisms for RPL 
  networks

- Data models for RPL and MPL management

- Additional Protocol elements to optimize operational efficiency