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[Page 7] Standards Track RFC 4291
February 2006 IPv6 Addressing Architecture For all unicast addresses, except those that start with the
binary value 000, Interface IDs are required to be 64 bits long and
to be constructed in Modified EUI-64 format. Modified EUI-64 format-based interface identifiers may have
universal scope when derived from a universal token (e.g., IEEE 802 48bit MAC or IEEE EUI-64 identifiers [EUI64]) or may have local scope
where a global token is not available (e.g., serial links, tunnel
end-points) or where global tokens are undesirable (e.g., temporary
tokens for privacy [PRIV]). Modified EUI-64 format interface identifiers are formed by
inverting the "u" bit (universal/local bit in IEEE EUI-64 terminology)
when forming the interface identifier from IEEE EUI-64
identifiers. In the resulting Modified EUI-64 format, the "u" bit is set to
one (1) to indicate universal scope, and it is set to zero (0) to
indicate local scope.
EUI-64 The first three oc...
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- Fall '13