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RPL Objective Function 0 IETF 80 status

RPL Objective Function 0 IETF 80 status. draft-ietf-roll-of0 Pascal Thubert …. OF0 Status. LATEST is draft-ietf-roll-of0-08 Now referenced in RPL IESG DISCUSS for interoperability

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RPL Objective Function 0 IETF 80 status

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  1. RPL Objective Function 0IETF 80 status draft-ietf-roll-of0 Pascal Thubert … IETF 80 – Roll WG – March 2011

  2. OF0 Status • LATEST is draft-ietf-roll-of0-08 • Now referenced in RPL • IESG DISCUSS for interoperability • If further guidance is not available then a RPL Router implementation MUST at least support the metric-less OF0 [I-D.ietf-roll-of0]. • Last call pending IETF 80 – Roll WG – March 2011

  3. What is an OF? • RPL was designed as a generic core • Agnostic to links and metrics • Adapted by Objective Functions • RPL (generic core) • Parent and feasible successor selection rules • Loop avoidance based on Rank • The OF (specific complement) • Selects the parents and feasible successors • Computes Rank IETF 80 – Roll WG – March 2011

  4. What is OF0? • Common OF for generic implementations • RPL core messages and containers only • Specifically no metrics containers • Step of Rank left to implementations • OF 0 provide • Normalization (best, normal, worst) • Guidance (admin. cost, dampening) • Magnifying factor to mix capabilities IETF 80 – Roll WG – March 2011

  5. Rank Factor • Strongly distinguish links of different types within a same DAG • powered over battery-operated or • wired over wireless • MAC type, policy … • SHOULD allow a configurable Rank-factor • MAY configure a more specific Rank-factor to specific categories of links. IETF 80 – Roll WG – March 2011

  6. OF0 Rank computation • Goal: Allow a larger diameter • R(N) = R(P) + Ri where Ri = Rf*Sp + Sr. • Sp: Step-of-Rank • Rf: Rank-factor • Sr: Stretch-of-Rank • Ri: Rank-increase • R(P): Rank of preferred parent • R(N): Rank of this node MINIMUM_RANK_FACTOR <= Rf <= MAXIMUM_RANK_FACTOR MINIMUM_STEP_OF_RANK <= Sp <= MAXIMUM_STEP_OF_RANK 0 <= Sr <= MAXIMUM_RANK_STRETCH IETF 80 – Roll WG – March 2011

  7. OF0 Constants and norms • MinHopRankIncrease: 256 • DEFAULT_STEP_OF_RANK: 3 * MinHopRankIncrease • MINIMUM_STEP_OF_RANK: 1 * MinHopRankIncrease • MAXIMUM_STEP_OF_RANK: 9 * MinHopRankIncrease • MAXIMUM_RANK_STRETCH: 5 * MinHopRankIncrease • DEFAULT_RANK_FACTOR: 1 • MINIMUM_RANK_FACTOR: 1 • MAXIMUM_RANK_FACTOR: 4 IETF 80 – Roll WG – March 2011

  8. Discussed Issues • Siblings removed from Main Spec • What do we do in OF0? (removed in 08) • Stretch constrained to siblings • Do we keep a stretch? (conserved in 08) • Parent selection • Need feed back from the group? (please) • Asymmetric links • Probably not the right place (no action) IETF 80 – Roll WG – March 2011

  9. !!!Thanks!!!!IETF 80 status draft-ietf-roll-of0 Pascal Thubert … IETF 80 – Roll WG – March 2011

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