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Re: Comments on raft-fz-6man-ipv6-alt-mark-01

Ole Troan <otroan@employees.org> Tue, 05 November 2019 07:51 UTC

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Subject: Re: Comments on raft-fz-6man-ipv6-alt-mark-01
From: Ole Troan <otroan@employees.org>
In-Reply-To: <BBA82579FD347748BEADC4C445EA0F21BF07ACE4@NKGEML515-MBX.china.huawei.com>
Date: Tue, 05 Nov 2019 08:51:19 +0100
Cc: Tom Herbert <tom@herbertland.com>, Giuseppe Fioccola <giuseppe.fioccola@huawei.com>, 6man WG <ipv6@ietf.org>
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References: <CALx6S35298CHBJsSs3LGY_0Pp2_eW-dQFCbQ6SLQneoQ5U=_yQ@mail.gmail.com> <FE11E326-43C2-409C-864E-62AD8B893050@employees.org> <BBA82579FD347748BEADC4C445EA0F21BF07ACE4@NKGEML515-MBX.china.huawei.com>
To: Tianran Zhou <zhoutianran@huawei.com>
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Hi Tianran,

> Yes, your proposal is a very good guidance for users to choose the mode how to take the alt-mark field.
> We will revise to show these considerations.
> But I think this is for the idea cases.
> We would also like to show some "abnormal" usage for legacy network. :-)
> That is to say, using SRH and DO for the hop by hop usage. I see the similar usage in RFC7837.
> What's your thoughts?

From RFC7837:
   "Hop-by-hop options would have been the best solution for carrying
   ConEx markings if they had met requirement R-3.  There is currently
   some work ongoing in the 6MAN working group to address this very
   issue [HBH-HEADER].  This new behavior would address R-3 and would
   make hop-by-hop options the preferred solution for carrying ConEx
   markings."

The work in 6MAN is done and the definition of HBH is updated in RFC8200.

Best regards,
Ole

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