Iljitsch van Beijnum wrote:
I haven't read all your messages on the subject yet, but how do you
handle the universal/local bit that's in the 16 bits that you want to
reclaim?
The U/L bit is currently being munged on the high bit of the EUI-64,
which is the high bit of the OUI part of the MAC-48 address.
The 16 bits I want to reclaim, are in the *middle* of the EUI-64, not at
the top end. I want to reclaim the "FFFE" fixed value bits.
EUI-64 format is:
<oui-24>FFFE<24bitsSerial>
MAC-48 format is:
<oui-24><24bitsSerial>
As for U/L bit:
Currently, U/L munges EUI-64:
<[01]ui-24>FFFE<24bitsSerial>
What I'm proposing for II is:
<optional padding><oui-24><24bitsSerial>
which then gets munged by:
<[01]ptional padding><oui-24><24bitsSerial> (or
<[01]ui-24><24bitsSerial> if no padding exists).
So, in the /80 case, the top bit of OUI gets set to 0 or 1 regardless of
what it was before, *exactly* like it does in the /64 for EUI-64 use.
(The fact that OUI-24 happens to not need the top bit to disambiguate
between OUIs, is as far as I can tell, a happy coincidence rather than
part of the IEEE spec.)
Brian
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