draft-ietf-roll-routing-metrics-02.txt   draft-ietf-roll-routing-metrics-03.txt 
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Intended status: Standards Track M. Kim, Ed. Intended status: Standards Track M. Kim, Ed.
Expires: April 29, 2010 Future Tech Lab., Korea Telecom Expires: April 29, 2010 Future Tech Lab., Korea Telecom
K. Pister K. Pister
Dust Networks Dust Networks
H. Chong H. Chong
Future Tech Lab., Korea Telecom Future Tech Lab., Korea Telecom
October 26, 2009 October 26, 2009
Routing Metrics used for Path Calculation in Low Power and Lossy Routing Metrics used for Path Calculation in Low Power and Lossy
Networks Networks
draft-ietf-roll-routing-metrics-02 draft-ietf-roll-routing-metrics-03
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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defined in this document: the Link Quality Level (LQL) and the defined in this document: the Link Quality Level (LQL) and the
Expected Transmission count Metric (ETX). Expected Transmission count Metric (ETX).
Note that an RPL implementation MAY either use the LQL, the ETX or Note that an RPL implementation MAY either use the LQL, the ETX or
both. both.
4.3.1. The Link Quality Level Reliability Metric 4.3.1. The Link Quality Level Reliability Metric
The Link Quality Level (LQL) object is used to quantify the link The Link Quality Level (LQL) object is used to quantify the link
reliability using a discrete value, from 0 to 3 where 0 indicates reliability using a discrete value, from 0 to 3 where 0 indicates
that the link quality level is unknown and 1 reports the lowest link that the link quality level is unknown and 1 reports the highest link
quality level. The mechanisms and algorithms used to compute the LQL quality level. The mechanisms and algorithms used to compute the LQL
is implementation specific and outside of the scope of this document. is implementation specific and outside of the scope of this document.
The LQL is global and can either be used as a metric or a constraint. The LQL is global and can either be used as a metric or a constraint.
When used as a metric, the LQL metric can be recorded or aggregated. When used as a metric, the LQL metric can be recorded or aggregated.
For example, the DAG may require to record the LQL for all traversed For example, the DAG may require to record the LQL for all traversed
links. Each node can then use the LQL to select the parent based on links. Each node can then use the LQL to select the parent based on
user defined rules (e.g. "select the path with the maximum number of user defined rules (e.g. "select the path with the maximum number of
links reporting a LQL value of 3"). By contrast the LQL link metric links reporting a LQL value of 3"). By contrast the LQL link metric
may be aggregated in which case, the sum of all LQL may be reported may be aggregated in which case, the sum of all LQL may be reported
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