RFC 4291:IP Version 6 Addressing Architecture
RFC-Ref

IEEE 802


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... interface identifiers may have universal scope when derived from a universal token (e.g., IEEE 802 48-bit MAC ...


... Links or Nodes with IEEE 802 48-bit MACs ...
... +----------------+----------------+----------------+----------------+ When IEEE 802 48-bit MAC addresses are available (on an interface ...
... interface identifiers other than IEEE EUI-64 or IEEE 802 48-bit MACs. Examples ...



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