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Re: [Lsr] Guidance for IANA flags field registry creation.

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Wed, 21 April 2021 16:12 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Tony Li <tony1athome@gmail.com>
CC: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Thread-Topic: [Lsr] Guidance for IANA flags field registry creation.
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Date: Wed, 21 Apr 2021 16:11:49 +0000
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Subject: Re: [Lsr] Guidance for IANA flags field registry creation.
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Tony -

Because this is shared between OSPF and IS-IS the related registry is in a different location.

https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#link-attribute-application-identifiers

as defined in 

https://www.rfc-editor.org/rfc/rfc8919.html#section-7.4 

For me, this falls into the same category as https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#prefix-attribute-flags . 
It is a general purpose flags field that was expected to be updated by a variety of otherwise unrelated documents and so we defined a registry for it.
This category of flags field was never under discussion - I thought you and I had agreed on this explicitly early on.

   Les


> -----Original Message-----
> From: Tony Li <tony1athome@gmail.com>
> Sent: Wednesday, April 21, 2021 7:47 AM
> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> Cc: Christian Hopps <chopps@chopps.org>; lsr@ietf.org; lsr-ads@ietf.org; lsr-
> chairs@ietf.org
> Subject: Re: [Lsr] Guidance for IANA flags field registry creation.
> 
> 
> Les,
> 
> > I did (an admittedly casual) review of such fields in all TLVs defined during
> the existence of the IS-IS/LSR WGs - which covers over 20 years. I did not find
> a single occurrence where the flags field ever got extended.
> 
> 
> draft-ietf-isis-te-app defines the Application Specific Link Attributes TLV.
> That includes the Standard Application Identifier Bit Mask and defines three
> bits.
> 
> draft-ietf-lsr-flex-algo extends this with one bit for FlexAlgo.
> 
> So there is one example.
> 
> Tony

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