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SRH insertion vs encapsulation (Re: Next steps on Extension Header Insertion)

神明達哉 <jinmei@wide.ad.jp> Fri, 04 November 2016 16:03 UTC

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From: 神明達哉 <jinmei@wide.ad.jp>
Date: Fri, 04 Nov 2016 09:03:38 -0700
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Subject: SRH insertion vs encapsulation (Re: Next steps on Extension Header Insertion)
To: Tim Chown <Tim.Chown@jisc.ac.uk>
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Cc: Fernando Gont <fgont@si6networks.com>, 6man WG <ipv6@ietf.org>, Bob Hinden <bob.hinden@gmail.com>
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At Fri, 4 Nov 2016 11:16:34 +0000,
Tim Chown <Tim.Chown@jisc.ac.uk> wrote:

>> Huh? The segment routing header is far from imaginary.
>
> But what do you deduce is really being specified in the SRH drafts?
>
> In draft-ietf-6man-segment-routing-header-02 it says in section 2.2:
[...]
> which implies the SRH uses encapsulation, and doesn’t insert an EH
> in the existing header chain.

My understanding is that actual implementations don't follow what's
written in the draft and do insert an SRH:
https://www.ietf.org/mail-archive/web/ipv6/current/msg24236.html

(And my understanding is that the desire of some people to make the
"actual" behavior explicitly standard-compliant is one major
background motivation of why we are having this thread.)

--
JINMEI, Tatuya

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