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Re: [802SEC] Fw[2]: Liaison Statement from WBA on Roaming OUI

Paul, and WG Chairs.

I hope the following might be helpful in responding to the incoming WBA liaison.  


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  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.

Quoting from the tutorial, “Two types of identifier– the 24-bit Organizationally Unique Identifier (OUI) and the 24-bit Company ID (CID)– are related to each other in that they come from the same 24-bit space but fall in different subspaces…”  “An OUI or a CID may be used for identification of a company, organization, entity, manufacturer, vendor, etc.”

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.”

This means for example, in specifying a protocol exchange that includes an RCOI, the device creating the RCOI for inclusion in the protocol field generates a number that is unique using an assigned CID or OUI as a base, and concatenating bits that create a unique RCOI.


On Nov 7, 2017, at 5:34 AM, Paul Nikolich <paul.nikolich@ATT.NET> wrote:


------ Forwarded Message ------
From: "Paul Nikolich" <>
Sent: 11/7/2017 8:24:54 AM
Subject: Fw: Liaison Statement from WBA on Roaming OUI

Dear EC Members,

I am remiss in forwarding the below liaison from WBA to our group, please add it to your agendas for consideration this week as appropriate.



------ Forwarded Message ------
From: "Tiago Rodrigues" <>
Sent: 11/1/2017 4:47:46 PM
Subject: Liaison Statement from WBA on Roaming OUI

Dear Bruce, Paul and Adrian,


Please see in attach a liaison statement from the WBA Testing & Interoperability Workgroup on the topic of IEEE Roaming OUI.


This liaison statement is to the attention of the following groups IEEE 802, IEEE 802.1 and IEEE 802.11.


Feel free to contact me if you have any enquiry.


Best Regards,
---------- This email is sent from the 802 Executive Committee email reflector. This list is maintained by Listserv.<WBA LS on IEEE Roaming OUI v1.0 20171031.docx>

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