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Enhancing Routing Metrics for Improved Network Efficiency

This document outlines changes in routing metrics, focusing on decoupling metrics and objective functions as per RPL I-D, controlling DAG structure while delegating cost computation, permitting multiple DAG Metric Containers, and extending the RPL option. Emphasis is placed on terminology cleanup, allowing specific constraints, and standardizing latency measurements. The revision includes the addition of the Node Fanout Ratio, adjusting metric comparisons, and introducing multiple constraints and metrics. The order of metrics in the DAG Metric Container becomes significant. Future considerations include local/global definitions, compound metrics, and weighted averages.

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Enhancing Routing Metrics for Improved Network Efficiency

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  1. IETF78 July 2010Routing metrics ID -08draft-ietf-roll-routing-metrics-08 JP Vasseur jpv@cisco.com Mijeon Kim mjkim@kt.com Kris Pister pister@eecs.berkeley.edu Nicolas Déjean nicolas.dejean@coronis.com Dominique Barthel dominique.barthel@orange-ftgroup.com

  2. Changes in -07 over -06 • Published June 10th • Decouple metrics and objective function (as per RPL I-D) • OF controls DAG structure while • delegating cost computation • Allow multiple DAG Metric Containers • RPL option now 256 bytes max • Prompted need for container extension

  3. Changes in -08 over -07 • Published July 9th • Terminology cleanup, legends, nits • A given metric/constraint object can appear no more than once as a metric and no more than once as a constraint • NE, E-E field use for a constraint • Latency, first sub-object must be currently observed latency

  4. Changes in -08 over -07 (ctd) • Added Node Fanout Ratio • Constraint or Metric • Comparison function for scalar metrics is implicit, known from metric type • Multiple NE constraints • Multiple metrics as tie-breakers • Appear in precedence order • Ordering in DAG Metric Container is significant

  5. Next ? • Local/Global definition • Compound metrics • Welcome real world usage • Weighted average, polynomial

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