[Idr] Re: [IANA #1435575] Early review: draft-ietf-idr-rfc4360-bis-01 (IETF 124)

[Jeffrey Haas <[e-mail]>]

Amanda,

Nat Kao has noted that we're addressing the helpful early review comments IANA has provided in various github issues.  This one addresses the FCFS procedures with regard to regular vs. extended types covered in https://github.com/ietf-wg-idr/draft-ietf-idr-rfc4360-bis/issues/17.  


> On Oct 30, 2025, at 7:43 PM, Amanda Baber via RT <[e-mail]> wrote:
> 4) There might be an issue related to this paragraph, which is carried over from RFC 4360: “The value allocated for a Regular Type MUST NOT be reused as the value of the high-order octet when allocating an Extended Type. The value of the high-order octet allocated for an Extended Type MUST NOT be reused when allocating a Regular Type.”
> 
> The potential problem is that values can be assigned via the First Come First Served registration procedure, but those values don’t receive any kind of review by anyone outside of IANA, and IANA’s Operations team isn’t equipped to make this determination. Should the First Come First Served procedure be changed to a lightweight Expert Review, with guidance to the expert that they only need to check for this? Or do the ranges of values made available in the registries' "Registration Procedure" fields already guarantee that this won’t happen?
> 

In principle, we can likely craft instructions IANA can carry out with regard to this restriction.  Simply put, the "type" field, if defined as "regular" MUST NOT permit sub-type fields and therefore child registries.  As of this time, several such registrations are present in the extended community registry:

https://www.iana.org/assignments/bgp-extended-communities/bgp-extended-communities.xhtml

Consider the examples of "QoS marking", "CoS capability" and others.

Is it IANA's recommendation to attempt to create additional guidance about this relationship or would it be IANA's preference for the "light weight review"? If the light weight review, is there current boilerplate normative text we should consider adding to the IANA considerations to cover this?  I note that IANA tends to run FCFS reservations for this registry by the IDR chairs anyway.

-- Jeff