Is this really that big of an issue? This seems to be taking a lot of the WGs 
time at this point for a fairly trivial thing.

Thanks,
Chris.

> On Apr 21, 2021, at 12:11 PM, Les Ginsberg (ginsberg) <[email protected]> 
> wrote:
> 
> 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 <[email protected]>
>> Sent: Wednesday, April 21, 2021 7:47 AM
>> To: Les Ginsberg (ginsberg) <[email protected]>
>> Cc: Christian Hopps <[email protected]>; [email protected]; [email protected]; lsr-
>> [email protected]
>> 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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