Re: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming

神明達哉 <jinmei@wide.ad.jp> Fri, 28 February 2020 00:48 UTC

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From: =?UTF-8?B?56We5piO6YGU5ZOJ?= <jinmei@wide.ad.jp>
Date: Thu, 27 Feb 2020 16:48:17 -0800
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Subject: Re: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming
To: "Darren Dukes (ddukes)" <ddukes@cisco.com>
Cc: Fernando Gont <fernando@gont.com.ar>, SPRING WG List <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
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At Thu, 27 Feb 2020 23:41:18 +0000,
"Darren Dukes (ddukes)" <ddukes@cisco.com> wrote:

> Hi Jinmei, allow me to address the two technical concerns you raise
> in this email, upon which it appears this interpretation of RFC8200
> hinges for you.  You state:

> > Aside from that this
> > interpretation logically doesn't make sense as it's not compatible
> > with AH or PMTUD, if it could be justified with that logic, we
> > wouldn't have had to go through the long debate in promoting RFC2460
>
> I know a lot of documentation and work has been done with SPRING and 6man since that debate.
>
> 1 - I expect everyone reviewing and commenting on draft-ietf-spring-srv6-network-programming (NETPGM) to have fully read draft-ietf-6man-segment-routing-header (SRH) as stated in section 1 NETPGM.
> 1.1 - remember SRH section 5 defines a deployment model for the SR domain applicable to both documents.
>
> 2 - AH is not defined for SRH (section 7.5 of SRH) so the question of how SRH with a PSP SID affects AH is not applicable to NETPGM.
>
> 3 - PMTUD within an SR domain is unaffected by PSP.
> 3.1 - Section 5.3 of SRH, provides recommendation on how MTU is handled within an SR Domain for traffic encapsulated for its journey within the SR domain.  i.e. it is not reliant on PMTUD within the SR Domain.
> 3.2 - Regardless, as others have stated, performing PSP and reducing the size of a packet has no impact on PMTUD.
>
> I hope this helps clarify your understanding of the current state of the art vs what may have been assumed at some point in the past before this was clarified by 6man and SPRING.

This is not my point (I was actually afraid about having this type of
response when referring to AH/PMTUD.  In retrospect it was probably a
mistake...); I didn't mean NETPGM violates RFC8200 because it would be
incompatible with AH/PMTUD.  My point was that it doesn't make sense
to refer to the phrase "the node...identified in the Destination
Address field of the IPv6 header" to justify the argument that NETPGM
doesn't violate RFC8200.

Now, please note that I'm not necessarily saying that the NETPGM draft
shouldn't move forward simply because it violates RFC8200.  If the
authors/WG believe NETPGM can be an exception to this part of RFC, it
should say it updates this part of RFC8200 and explain why it's
justified (where the discussion about AH/PMTUD will matter).  This
will certainly draw more attention from various kinds of reviewers and
you may find it difficult to defend the claim for these reviewers, but
I don't think it necessarily impossible.  The current version of the
draft doesn't do this, and authors and its supporters just seem to
dismiss the RFC violation with the awkward reference to the
"Destination Address" text.  That's what concerned me.

--
JINMEI, Tatuya