[6lo] Quick update on draft-ietf-6lo-6lobac

Kerry Lynn <kerlyn@ieee.org> Thu, 23 July 2015 03:59 UTC

Return-Path: <kerlyn2001@gmail.com>
X-Original-To: 6lo@ietfa.amsl.com
Delivered-To: 6lo@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com []) by ietfa.amsl.com (Postfix) with ESMTP id E27161A00F3 for <6lo@ietfa.amsl.com>; Wed, 22 Jul 2015 20:59:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.027
X-Spam-Status: No, score=-1.027 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=no
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id yFTWwSe3nA4C for <6lo@ietfa.amsl.com>; Wed, 22 Jul 2015 20:59:58 -0700 (PDT)
Received: from mail-lb0-x22c.google.com (mail-lb0-x22c.google.com [IPv6:2a00:1450:4010:c04::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 34D2A1A00D8 for <6lo@ietf.org>; Wed, 22 Jul 2015 20:59:58 -0700 (PDT)
Received: by lbbqi7 with SMTP id qi7so68837652lbb.3 for <6lo@ietf.org>; Wed, 22 Jul 2015 20:59:56 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:date:message-id:subject:from:to:cc:content-type; bh=Rf+j8rnk6Go3V3rlJex5NywhcUTeerEu2KHsi1BmEEw=; b=BXGFrJlTPkySghzuoJHObBpauNTwp3AuO6OmSsjA80tvC9hN0NhTXL7/16DvMJkODS 4jvdL5oNV20osqneJRlHiLgmEBJqwCCk1VQY6IL7tzS3LrxGncRv51Gemy90lFh52Aak ZILy8mro2VLFaNnbErg9U1KPOisa065rVAYxVoBbKUmA6aALq//FEkheh67NSwInZikp 1HBpIGgqe45mqdqFzwdF8QRMN05UC9JVrpej63Hp8FdSzylbOU9qxr18UXO3Pma07EXB zyULzaUlsgPuWzDeympfIZz32gdiqwsCE14ovSY498IoeQOakmoHupyC+UueWM8qpqRw c9HA==
MIME-Version: 1.0
X-Received: by with SMTP id mr6mr5469578lbb.83.1437623996564; Wed, 22 Jul 2015 20:59:56 -0700 (PDT)
Sender: kerlyn2001@gmail.com
Received: by with HTTP; Wed, 22 Jul 2015 20:59:56 -0700 (PDT)
Date: Wed, 22 Jul 2015 23:59:56 -0400
X-Google-Sender-Auth: v-bHgUbzhnPmN3mYFQkkfFwIusM
Message-ID: <CABOxzu3VHdYB-Vidy3Gr=MAWhaMKZhLjcuj7HcHF49w4+wu0nA@mail.gmail.com>
From: Kerry Lynn <kerlyn@ieee.org>
To: "6lo@ietf.org" <6lo@ietf.org>
Content-Type: multipart/alternative; boundary=089e0122aecaa2cb5a051b82ebe5
Archived-At: <http://mailarchive.ietf.org/arch/msg/6lo/HxlflANC6QVKbJQiaRW1scawt30>
Cc: "Donaldson, Stuart \(WA26\)" <Stuart.Donaldson@honeywell.com>, Carl Neilson <cneilson@deltacontrols.com>, Jerry Martocci <jerald.p.martocci@jci.com>
Subject: [6lo] Quick update on draft-ietf-6lo-6lobac
X-BeenThere: 6lo@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "Mailing list for the 6lo WG for Internet Area issues in IPv6 over constrained node networks." <6lo.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6lo>, <mailto:6lo-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/6lo/>
List-Post: <mailto:6lo@ietf.org>
List-Help: <mailto:6lo-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6lo>, <mailto:6lo-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 23 Jul 2015 04:00:00 -0000


I regret that I will be unable to remotely provide an update on 6LoBAC
due to a scheduling conflict, so Samita asked me to post a quick update
to the list.  For those who may not be familiar, this is a proposal for
conveying IPv6 over RS-485 twisted pair using a token-passing MAC.

We received the required Frame Type assignment from ASHRAE (the
organization that defines the underlying MS/TP MAC) just prior to IETF
92, so there are no remaining external dependencies.

The draft has been reviewed by two group members, Peter van der Stok
and James Woodyatt (thanks guys) and their comments have been
addressed in the latest draft.  The summary of changes is in the slides
and I won't repeat it here.

The technical details of 6LoBAC have been stable for quite some time.
The major change in this draft was the elimination of the uncompressed
IPv6 header Dispatch Value (since Carsten and a few others were strongly
in favor of this).  I missed the discussion of Dispatch Values at this IETF,
but I guess we need to keep this value in the registry even if we're not
going to use it.

I continue to have concerns about the direction of the default-iids
discussion.  In the case of this proposal, I think there are good
reasons to specify MAC-address-derived IIDs for use in link-local addresses
and I expect a debate when this draft makes it through last call.  My take
the matter is the perceived threat is mainly to users of mobile personal-use
devices that use static EUI identifiers.  6LoBAC has none of these

There will be another draft forthcoming.  One major oversight on my part
was not updating the Acknowledgments section to include those who have
contributed valuable comments.  I also plan to reverse myself (again) in
Section 8 and left-justify the short address to agree with the format of RFC
4944.  Additional reviews and comments are welcomed.

Finally, I have a running implementation based on Contiki plus a wireshark
dissector that I plan to open source by the early fall.  6LoBAC is a
for the ETSI plugtest in Yokohama and I am happy to assist anyone who
might want to try implementing this.  Contact me if you need a copy of
who BACnet Clause 9 (the MS/TP specification).

Regards, Kerry Lynn