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Multicast Address Compression For commonly-used, well-known multicast addresses Use 6LoWPAN short address encoding Prefix (8-bits): Compressed to 3-bit range Flags (4-bits): Assumed to be zero permanent, not derived from prefix, doesn’t embed RP Scope (4-bits): Carried in-line Group ID (112-bits): Mapped to 9-bits Only all-nodes and all-routers currently defined Can be used in LOWPAN_HC1g or Mesh Addressing 1 0 1 Scope Group ID 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 1 FF Flags Scope Group ID 128 bits |