Re: [mpls] Pipelining the inevitable adoption poll on draft-nainar-mpls-rfc8287-len-clarification

Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Tue, 26 February 2019 11:55 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-nainar-mpls-rfc8287-len-clarification@ietf.org" <draft-nainar-mpls-rfc8287-len-clarification@ietf.org>, 'Loa Andersson' <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Pipelining the inevitable adoption poll on draft-nainar-mpls-rfc8287-len-clarification
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Date: Tue, 26 Feb 2019 11:55:00 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/ME5mh7DFR14y8SZLq1lr3sDJhU0>
Subject: Re: [mpls] Pipelining the inevitable adoption poll on draft-nainar-mpls-rfc8287-len-clarification
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Adrian,

Just to make it clear, I have filed the erratum  on RFC 8287 (which, I believe is the singular form while errata is plural) that has been rejected by Deborah because "This change requires an update to the RFC, requires consensus".



I agree that we could make the draft somewhat shorter  - but not by much: the part that looks too long to you takes roughly 2 pages out of 5.5.

The added value is that the current version means that the implementer does not have to do any length calculations (that always carry with them the risk of miscalculations): everything is spelled out in the same way as it is in RFC 8029.



I also think that when the "reserved" field is explicitly defined as following:

<quote>
   Reserved

      The Reserved field MUST be set to 0 when sent and MUST be ignored
      on receipt.

<end quote>

it is somewhat different to distinguish it from a "true" MBZ field: What's in a name?



And I do not think that this field has been intended for the future sub-TLVs since it itself is part of a sub-TLV.



The bottom line: I think that the draft is ready for adoption by the WG. If the WG, following adoption, requests to make it shorter, we can do that.



Regards,

Sasha



Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@ecitele.com





-----Original Message-----
From: mpls <mpls-bounces@ietf.org> On Behalf Of Adrian Farrel
Sent: Tuesday, February 26, 2019 1:20 PM
To: 'Loa Andersson' <loa@pi.nu>; mpls@ietf.org
Cc: mpls-chairs@ietf.org; draft-nainar-mpls-rfc8287-len-clarification@ietf.org
Subject: [mpls] Pipelining the inevitable adoption poll on draft-nainar-mpls-rfc8287-len-clarification



Hi,



Since Loa is polling for IPR, I suspect an adoption poll is likely to follow.



I know this document arises from confusion during interop, and I have some sympathy with people who find RFCs hard to parse. I also understand that the AD rejected fixing this through an Errata Report, and so the only option is to publish an RFC (the motivation here appears to be that consensus is needed for the resolution).



IMHO, 8029 is clear on how to set the length of a TLV or sub-TLV. The sub-TLV length includes all of the fields of the sub-TLV, but not any trailing padding. The TLV length includes all of the sub-TLV padding.



Thus, the only issue I can see here was that there was confusion about whether fields marked as "Reserved" formed part of the sub-TLVs. The only reason they would be, would be to allow for future extensions, otherwise they would just be padding.



Clearly (according to this document) they were intended to be part of the sub-TLVs (for extensions). That is inconsistent with how 8029 is written, but since 8287 uses "Reserved" not "MBZ" it is acceptable if that is really want people want to achieve (i.e., that is the consensus decision that is needed).



Doesn't that mean that the *only* text needed is to say...

"Fields marked 'Reserved' in sub-TLVs defined in RFC 8287 are an integral part of the sub-TLVs and MUST be accounted in computation of the length of the sub-TLVs."?



The current draft seems like a lot of text to make that clarification.



Thanks,

Adrian



-----Original Message-----

From: mpls <mpls-bounces@ietf.org<mailto:mpls-bounces@ietf.org>> On Behalf Of Loa Andersson

Sent: 26 February 2019 07:09

To: mpls@ietf.org<mailto:mpls@ietf.org>

Cc: mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>;

draft-nainar-mpls-rfc8287-len-clarification@ietf.org<mailto:draft-nainar-mpls-rfc8287-len-clarification@ietf.org>

Subject: [mpls] IPR poll on draft-nainar-mpls-rfc8287-len-clarification



Working Group, authors,



We have started to prepare draft-nainar-mpls-rfc8287-len-clarification

for working group adoption, prior to the wgap we need to do an IPR poll.



This mail starts this IPR poll.



Are you aware of any IPR that applies to draft-nainar-mpls-rfc8287-len-clarification?



If so, has this IPR been disclosed in compliance with IETF IPR rules (see RFCs 3979, 4879, 3669 and 5378 for more details).



There no IPR disclosures against draft-nainar-mpls-rfc8287-len- clarification.



If you are listed as a document author or contributor please respond to this email regardless of whether or not you are aware of any relevant IPR. *The response needs to be sent to the MPLS WG mailing list.* The document will not advance to the next stage until a response has been received from each author and contributor.



If you are on the MPLS WG email list but are not listed as an author or contributor, then please explicitly respond only if you are aware of any IPR that has not yet been disclosed in conformance with IETF rules.





/Loa

  mpls wg co-chair

--





Loa Andersson                        email: loa@pi.nu<mailto:loa@pi.nu>

Senior MPLS Expert

Bronze Dragon Consulting             phone: +46 739 81 21 64



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