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IEEE
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... interface identifiers may have universal
scope when derived from a universal token (e.g., IEEE 802 48-bit MAC
...
... the "u" bit (universal/local bit in IEEE EUI-64 terminology) when
forming the interface identifier ...
... to indicate universal scope, and it is set to zero (0) to indicate
local scope. The first three octets in binary of an IEEE EUI-64
identifier ...
... interface identifier is to invert the "u" (universal/local) bit. An
example is a globally unique IEEE EUI-64 identifier of the form:
...
... +----------------+----------------+----------------+----------------+
When IEEE 802 48-bit MAC addresses are available (on an interface ...
... identifier. The 0xFF and 0xFE values are used when starting
with an IEEE EUI-48 identifier. The incorrect value was used
in earlier versions ...
... in earlier versions of the specification due to a
misunderstanding about the differences between IEEE MAC-48 and
EUI-48 identifiers ...
... requirements for IPv6 interface
identifiers (i.e., that they must be unique on the link), IEEE
EUI-48 and MAC-48 identifiers ...