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| Paul, and WG Chairs. I hope the following might be helpful in responding to the incoming WBA liaison. —Bob IEEE Std
802c-2017 was published in August 2017. The
IEEE Registration Authority tutorial on Guidelines
for Use of Extended Unique Identifier (EUI), Organizationally Unique Identifier
(OUI), and Company ID (CID) can be found at http://standards.ieee.org/develop/regauth/tut/eui.pdf. This tutorial was published at the same time
as IEEE Std 802c-2017. The tutorial provides
useful information on your questions including guidance you have requested. In response to
your questions. 1.
Where
MAC Addresses are not required IEEE Registration Authority customers will be
guided to request a CID instead of an MA-L (with its included OUI). An MA-S assignment would not be appropriate
because the included OUI-36 would not provide any room for extension for the
36-bit RCOI. If the organization already
has been assigned an OUI, They could use that OUI instead of a CID. 2.
The
ranges specified on MA-L, MA-M and MA-S assignments are for EUI-48 and EUI-64 (which are typically used as MAC addresses). It is not appropriate to describe for example
picking a 40-bit number from a range of 48-bit EUIs. The context dependent extended identifier
should be specified using a base of a CID or OUI assignment, extending the
24-bits of that identifier to 36-bits or 40-bits as required by RCOI
specifications you would write. 3.
Your RCOI as described is one of many possible context dependent
extended identifiers. Quoting from the
tutorial: “In addition to serving as a
globally unique organization identifier, an OUI, OUI- 36, or CID may also be
used as the basis of extended identifiers, including protocol identifiers and
context dependent identifiers, by concatenating additional differentiating
bits. These extended identifiers might be globally unique (e.g., EUI-48 and
EUI-64) or only unique within the context in which they are used.”
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