The IESG has approved the following document: - 'A Mechanism to Measure the Routing Metrics along a Point-to-point Route in a Low Power and Lossy Network' (draft-ietf-roll-p2p-measurement-10.txt) as Experimental RFC This document is the product of the Routing Over Low power and Lossy networks Working Group. The IESG contact persons are Adrian Farrel and Stewart Bryant. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-roll-p2p-measurement/ Technical Summary This document specifies a mechanism that enables an RPL router to measure the aggregated values of given routing metrics along an existing route towards another RPL router in a low power and lossy network, thereby allowing the router to decide if it wants to initiate the discovery of a better route. The mechanism described in this document can be used by an Origin in an LLN to measure the aggregated values of some routing metrics along a route to a Target within the LLN. The route is measured in the direction from the Origin to the Target. Such a route could be a source route or a hop-by-hop route established using RPL [RFC6550] or P2P-RPL [I-D.ietf-roll-p2p-rpl]. The Origin decides what metrics to measure and sends a Measurement Request message, carrying the desired routing metric objects, along the route. On receiving a Measurement Request, an Intermediate Router updates the routing metric values inside the message and forwards it to the next hop on the route. Thus, the Measurement Request accumulates the values of the routing metrics for the complete route as it travels towards the Target. Upon receiving the Measurement Request, the Target unicasts a Measurement Reply message, carrying the accumulated values of the routing metrics, back to the Origin. Optionally, the Origin may allow an Intermediate Router to generate the Measurement Reply if it already knows the relevant routing metric values along rest of the route. Working Group Summary: No discontent. Once again, few comments, request for clarifications that have all been addressed by in this revision. Document Quality: Yes there are several known implementations of this specification, with interop testing: An interoperability was carried out last month with INRIA's implementation against Sigma Design's implementation. The report can be found: http://hal.inria.fr/docs/00/66/16/29/PDF/RR-7864.pdf Experiments with P2P-RPL have also taken place on the Senslab testbed gathering boards based on MSP430 and 802.15.4 at 2.4GHz: http://hal.archives-ouvertes.fr/docs/00/65/16/03/PDF/SOFTCOM-2011.pdf Personnel: The Document Shepherd is JP Vasseur (jvasseur@cisco.com) The Responsible AD is Adrian Farrel (adrian@olddog.co.uk)
