[spring] Re: following-up discussion on draft-liu-spring-aggregate-header-limit-problem

[Acee Lindem <[e-mail]>]

On second thought, we have MSD  in a YANG model now and these are very hard to change. I now think that we shouldn't overload the current MSD. If we do agree that this aggregate header length (AGL) is necessary then we can come up with something that is more generic and encompasses AGL. 

Thanks,
Acee

> On Aug 14, 2024, at 10:26 AM, Alvaro Retana <[e-mail]> wrote:
> 
> Hi!
> 
> IMHO, we don’t need to formally update all those other documents — maybe just the one that initially defined the term.  The important thing here is that it can be done with a single document: the other documents wouldn’t need to be republished.
> 
> Alvaro.
> 
> On August 14, 2024 at 5:32:32 AM, [e-mail] ([e-mail]) wrote:
>> 
>> 
>> Hi Acee,
>> If the meaning of MSD is expanded to "Maximum State Depth" or something else, the existing RFCs(e.g, RFC8664/RFC8491/RFC8476) which already interpret MSD as Maximum SID Depth in the text would be effected.
>> All of them needs a update if doing so?
>> 
>> Yao
>> 
>> Original
>> From: AceeLindem <[e-mail]>
>> To: 刘尧00165286;
>> Cc: [e-mail] <[e-mail]>;[e-mail] <[e-mail]>;[e-mail] <[e-mail]>;[e-mail] <[e-mail]>;
>> Date: 2024年08月13日 22:49
>> Subject: [spring] Re: following-up discussion on draft-liu-spring-aggregate-header-limit-problem
>> _______________________________________________
>> spring mailing list -- [e-mail]
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>> Perhaps, maximum it could be generalized to “Maximum State Depth” with the existing types. 
>> Acee
>> 
>>> On Aug 13, 2024, at 05:27, <[e-mail]> <[e-mail]> wrote:
>>> 
>>> Hi Jeff,
>>> 
>>> Yes, strictly speaking, the meaning of some existing MSD types do not fully conform to the original “Maximum SID Depth” definition (but it has to be admitted that all of them are related to the number of SIDs/labels to some extend), and we're using them without misunderstanding. 
>>> 
>>> Thanks,
>>> Yao
>>> 
>>> 
>>> _______________________________________________
>>> spring mailing list -- [e-mail]
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>> 
>> From: JeffTantsura <[e-mail]>
>> To: 刘尧00165286;
>> Cc: Eric Vyncke (evyncke) <[e-mail]>;Alexander Vainshtein <[e-mail]>;spring <[e-mail]>;
>> Date: 2024年08月13日 04:19
>> Subject: [spring] Re: following-up discussion on draft-liu-spring-aggregate-header-limit-problem
>> _______________________________________________
>> spring mailing list -- [e-mail]
>> To unsubscribe send an email to [e-mail]
>> Hi Yao,
>> I think as long as the new type name is coherent, MSD could be used as a generic acronym without much harm.
>> I don’t see any ambiguity with the new MSD-types defined - https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-msd-types
>> 
>> Thanks,
>> Jeff
>> 
>>> On Aug 1, 2024, at 17:35, [e-mail] wrote:
>>> 
>>> Hi Eric, Jeff and Sasha,
>>> 
>>> Thank you all for the interest and comments on draft-liu-spring-aggregate-header-limit-problem during the presentation on last week's SPRING meeting.
>>> Here're the following-up responses to the comments and some related information on this work.
>>> 
>>> Comments from Eric: 
>>> Refering to RFC9098 instead of RFC8883 on aggregate header limit. 
>>> Response: 
>>> We've checked RFC9098 after the meeting, but haven't found any formal description on aggregate header limit. So we still have to refer to RFC8883 when it comes to the definition of aggregate header limit. But RFC9098 provides some detailed information on intermediate systems processing Layer 4 information, in this case it needs  process the entire IPv6 header chain as well. We'll add RFC9098 as a reference for this scenario.
>>> 
>>> Comments from Jeff&Sasha: 
>>> MSD(IGP/BGP/YANG) has provided a mechanism for node's processing limit info advertisement and collection, and it is well defined, a new MSD type for AHL or similar mechanism can meet the requirement.
>>> Response: 
>>> In fact, we've already written a draft draft-liu-lsr-aggregate-header-limit, and the basic idea is defining a new MSD type so the existing mechanism for MSD can all be leveraged. 
>>> It has been discussed on the LSR list and presented in LSR IETF119, but the objection of this approach is that, AHL is a none-routing info, it should not be advertised along with the route advertisement like MSD(although MSD already did that). A suggestion is to leverage the non-routing information signaling mechanism in IGP (draft-ietf-lsr-ospf-transport-instance, RFC6823) for AHL advertisement.
>>> You can find the discussion around the this draft in the lsr minutes [https://datatracker.ietf.org/doc/minutes-119-lsr-202403210300/#signaling-aggregate-header-size-limit-via-igp] and the chatlog [https://datatracker.ietf.org/doc/chatlog-119-lsr-202403211300/] on IETF119. 
>>> 
>>> 
>>> Thanks,
>>> Yao
>>> 
>>> 
>>> 
>>> 
>> 
>> 
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