Loop Free RPL

Document Type Expired Internet-Draft (individual)
Authors Jianlin Guo , Philip Orlik
Last updated 2013-12-28 (latest revision 2013-06-26)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The IETF has developed the IPv6 based standards for Low-power and Lossy Networks (LLNs) to meet requirements of constrained applications, such as field monitoring, inventory control and so on. The IPv6 Routing Protocol for LLNs (RPL) was published as [RFC6550] in March 2012. Based on routing metrics and constraints [RFC6551], RPL builds Directed Acyclic Graph (DAG) topology to establish bidirectional routes for LLNs for traffic types of multipoint-to- point, point-to-multipoint, and point-to-point. RPL routes are optimized for traffic to or from one or more roots that act as sinks. As a result, a DAG is partitioned into one or more Destination Oriented DAGs (DODAGs), one DODAG per sink. RPL is widely considered as a feasible routing protocol for LLNs. However, DODAG loops and lack of a loop free DODAG local repair mechanism are two open issues to be addressed. This draft introduces an alternative rank and an Objective Function to eliminate DODAG loops in RPL. Based on the proposed rank and Objective Function, this draft introduces a loop free RPL.


Jianlin Guo (guo@merl.com)
Philip Orlik (porlik@merl.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)