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Multicast Forwarding in LLNs (draft-ietf-roll-trickle-mcast-01)

Multicast Forwarding in LLNs (draft-ietf-roll-trickle-mcast-01). Jonathan Hui Richard Kelsey ROLL WG Meeting 84 th IETF Meeting Vancouver, Canada. History. 2011-04-11: draft-ietf-roll-trickle-mcast-00 Expired 2011-10-13 2012-07-13: draft-ietf-roll-trickle-mcast-01 No changes to content.

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Multicast Forwarding in LLNs (draft-ietf-roll-trickle-mcast-01)

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  1. Multicast Forwarding in LLNs(draft-ietf-roll-trickle-mcast-01) Jonathan Hui Richard Kelsey ROLL WG Meeting 84th IETF Meeting Vancouver, Canada 84th IETF Meeting – ROLL WG

  2. History • 2011-04-11: draft-ietf-roll-trickle-mcast-00 • Expired 2011-10-13 • 2012-07-13: draft-ietf-roll-trickle-mcast-01 • No changes to content 84th IETF Meeting – ROLL WG

  3. Overview • Problem • Forward IPv6 multicast messages without maintaining a multicast forwarding topology • Solution • Flood (disseminate) IPv6 multicast messages • All devices in LLN receive the message 84th IETF Meeting – ROLL WG

  4. Dissemination Overview • On receiving a message • If “new” message, • retransmit the message, • pass to upper layers if subscribed to mcast group • Otherwise, drop message • What is “new”? • IPv6 HbH Option (SeedID, SeqNo) • SeedID: device that initiates dissemination • SeqNo: duplicate detection, message ordering 84th IETF Meeting – ROLL WG

  5. Retransmission Strategies • Simple flooding (low latency) • Retransmit N times • Controlled dissemination (low redundancy) • Trickle [RFC6206] • Adaptive transmission timing • Redundant transmission suppression • Advertise summaries rather than actual data messages • Trickle parameterization • Simple flood: set k to infinity (no suppression) • Controlled dissemination: set k to small value 84th IETF Meeting – ROLL WG

  6. Sliding Windows • Disseminate multiple messages from same SeedID • Receiving messages out of order will filter old messages • Sliding window • Bounded history to allow some out-of-order • May size window based on memory constraints 84th IETF Meeting – ROLL WG

  7. Implementations • ZigBee • Component of SEP 2.0 • Implementation by several vendors • Simple flooding used with mDNS • Cisco • Simple flooding and controlled dissemination • Peter van der Stok • Controlled dissemination in simulation • Others? 84th IETF Meeting – ROLL WG

  8. Next Steps • IPv6-in-IPv6 Encapsulation • Insert/remove HbH Option • Reserve bits for straightforward evolution • Flags/version/etc. • Incorporate suggestions in draft-vanderstock-roll-mcreq • Add more text, tighten up specification, etc. • More feedback from WG! 84th IETF Meeting – ROLL WG

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