Re: [6tisch] Roman Danyliw's Discuss on draft-ietf-6tisch-enrollment-enhanced-beacon-12: (with DISCUSS and COMMENT)

Roman Danyliw <rdd@cert.org> Fri, 28 February 2020 14:09 UTC

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From: Roman Danyliw <rdd@cert.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
CC: "6tisch@ietf.org" <6tisch@ietf.org>, "pthubert@cisco.com" <pthubert@cisco.com>, "6tisch-chairs@ietf.org" <6tisch-chairs@ietf.org>, "The IESG" <iesg@ietf.org>, "draft-ietf-6tisch-enrollment-enhanced-beacon@ietf.org" <draft-ietf-6tisch-enrollment-enhanced-beacon@ietf.org>
Thread-Topic: [6tisch] Roman Danyliw's Discuss on draft-ietf-6tisch-enrollment-enhanced-beacon-12: (with DISCUSS and COMMENT)
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Date: Fri, 28 Feb 2020 14:09:00 +0000
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Subject: Re: [6tisch] Roman Danyliw's Discuss on draft-ietf-6tisch-enrollment-enhanced-beacon-12: (with DISCUSS and COMMENT)
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Hi Richard!

> -----Original Message-----
> From: iesg <iesg-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: Monday, February 24, 2020 6:24 PM
> To: Roman Danyliw <rdd@cert.org>
> Cc: 6tisch@ietf.org; pthubert@cisco.com; 6tisch-chairs@ietf.org; The IESG
> <iesg@ietf.org>rg>; draft-ietf-6tisch-enrollment-enhanced-beacon@ietf.org
> Subject: Re: [6tisch] Roman Danyliw's Discuss on draft-ietf-6tisch-enrollment-
> enhanced-beacon-12: (with DISCUSS and COMMENT)
> 
> 
> Roman Danyliw <rdd@cert.org> wrote:
>     >> > ** Section 2.  network id.  Can you please clarify the computation of
>     >> > the default value using SHA-256.
>     >>
>     >> I have changed the text to say:
>     >> : In a 6tisch network, where RPL {{RFC6550}} is used as the mesh routing
>     >> protocol, the
>     >> network ID can be constructed from a truncated SHA256 hash of the
> prefix
>     >> (/64) of the
>     >> network.  This will be done by the RPL DODAG root and communicated
> by
>     >> the RPL
>     >> Configuration Option payloads, so it is not calculated more than once.
>     >> That is just a suggestion for a default algorithm: it may be set in any
>     >> convenience way that results in a non-identifing value.
> 
>     > Understood.  However, to clarify, is there guidance on how this
>     > truncation should be applied (i.e., which bits are supposed to be used?
>     > )?
> 
> The calculation is
> a) a suggestion on how the control plane should initialize itself by default.
> b) done once in the 6LBR, so any truncation is acceptable.
> 
> I.e. it doesn't matter how it's done.
> 
> Communicating the NetworkID down the RPL DODAG is ROLL WG work,
> which has not proceeded in pace with this work.

Understood.  Thanks for the changes in -13/-14. Do you think it will be obvious to the reader/audience that any truncation is acceptable (which was more my point, not clearly articulated)?  

Thanks.  I'll clear my position.

Roman