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Re: [Lsr] When is an IANA Registry Required

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Wed, 17 March 2021 19:31 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Tony Li <tony.li@tony.li>, Alvaro Retana <aretana.ietf@gmail.com>
CC: "draft-ietf-lsr-isis-srv6-extensions@ietf.org" <draft-ietf-lsr-isis-srv6-extensions@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, John Scudder <jgs@juniper.net>, Christian Hopps <chopps@chopps.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Thread-Topic: [Lsr] When is an IANA Registry Required
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Date: Wed, 17 Mar 2021 19:30:56 +0000
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Subject: Re: [Lsr] When is an IANA Registry Required
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Tony -

> -----Original Message-----
> From: Tony Li <tony1athome@gmail.com> On Behalf Of Tony Li
> Sent: Wednesday, March 17, 2021 11:37 AM
> To: Alvaro Retana <aretana.ietf@gmail.com>
> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; draft-ietf-lsr-isis-srv6-
> extensions@ietf.org; lsr@ietf.org; John Scudder <jgs@juniper.net>;
> Christian Hopps <chopps@chopps.org>; lsr-chairs@ietf.org
> Subject: Re: [Lsr] When is an IANA Registry Required
> 
> 
> 
> > I don't know that you and I are getting anywhere.  I know Robert also
> > cares about this topic, I hope others do too.
> 
> 
> I care.
> 
> It seems to me that we have registries where we have different documents
> allocating values from the same space. This makes sense: we need to
> coordinate things.
> 
> IMHO, whether that space is a set of bit values, octets, shorts, longs, or
> strings doesn’t matter at all.
> 
> It should be tracked and coordinated so that we don’t have collisions. Shared
> namespaces are fine, but anything shared needs to be managed.
> 
[Les:] The question here is whether there is a qualitative difference between two classes of bit fields.

Category 1 
Flags field in TLVs/sub-TLVs  used for a specific purpose. Addition of new flags to these TLVs would be defined either in a bis draft or a draft which updates the corresponding base draft.
Currently we do not have registries for these cases.

A few examples (there are many more):
1)Flags field in TLV 236 (RFC 5308)
2)Flags field in Prefix Segment Identifier (Prefix-SID) Sub-TLV ( https://www.rfc-editor.org/rfc/rfc8667.html#section-2.1 )
3)Flags field in SRv6 Locator TLV ( https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-11#section-7.1 )

Category 2

Flag fields available for use by a variety of unrelated applications.  There are currently two existing examples - both of which have registries.

 https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#prefix-attribute-flags

 https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-19of22

As you can see from the current assignments, in both cases bit definitions occur in the context of drafts which are otherwise unrelated.

The question here is whether bit registries are also appropriate for category 1.

If you could clarify your opinion to speak to this more specific question that would be helpful - at least to me.

Thanx.

   Les


> Tony

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