Re: [Roll] ticket - 172 - clarify units of trickle timers

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 17 August 2015 17:31 UTC

Return-Path: <mcr@sandelman.ca>
X-Original-To: roll@ietfa.amsl.com
Delivered-To: roll@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3AC3C1ACD84 for <roll@ietfa.amsl.com>; Mon, 17 Aug 2015 10:31:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.611
X-Spam-Level:
X-Spam-Status: No, score=-2.611 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KL47pT-7r1ZZ for <roll@ietfa.amsl.com>; Mon, 17 Aug 2015 10:31:54 -0700 (PDT)
Received: from tuna.sandelman.ca (tuna.sandelman.ca [209.87.249.19]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 60FEA1ACD7E for <roll@ietf.org>; Mon, 17 Aug 2015 10:31:54 -0700 (PDT)
Received: from sandelman.ca (obiwan.sandelman.ca [209.87.249.21]) by tuna.sandelman.ca (Postfix) with ESMTP id 202B4200A3 for <roll@ietf.org>; Mon, 17 Aug 2015 13:50:08 -0400 (EDT)
Received: by sandelman.ca (Postfix, from userid 179) id 1CF8063B10; Mon, 17 Aug 2015 13:31:52 -0400 (EDT)
Received: from sandelman.ca (localhost [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id F3D4763AEC for <roll@ietf.org>; Mon, 17 Aug 2015 13:31:52 -0400 (EDT)
From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
In-Reply-To: <CABOxzu08_b44EkBDTm3uE7F26x5MEHOLgBszvi1gHX93+BTb1w@mail.gmail.com>
References: <29012.1439555277@sandelman.ca> <3ac1e1929e2d2c781db8ce08a6955e7e@xs4all.nl> <16420.1439823867@sandelman.ca> <CABOxzu08_b44EkBDTm3uE7F26x5MEHOLgBszvi1gHX93+BTb1w@mail.gmail.com>
X-Mailer: MH-E 8.6; nmh 1.3-dev; GNU Emacs 24.4.2
X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m<nPbLgmtKK-5dC@#:k
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha1; protocol="application/pgp-signature"
Date: Mon, 17 Aug 2015 13:31:52 -0400
Message-ID: <14493.1439832712@sandelman.ca>
Sender: mcr@sandelman.ca
Archived-At: <http://mailarchive.ietf.org/arch/msg/roll/d1JsXu7O4Km3dw0mKZP83lAb34g>
Subject: Re: [Roll] ticket - 172 - clarify units of trickle timers
X-BeenThere: roll@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
Reply-To: Routing Over Low power and Lossy networks <roll@ietf.org>
List-Id: Routing Over Low power and Lossy networks <roll.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/roll>, <mailto:roll-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/roll/>
List-Post: <mailto:roll@ietf.org>
List-Help: <mailto:roll-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/roll>, <mailto:roll-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Aug 2015 17:31:56 -0000

Kerry Lynn <kerlyn@ieee.org> wrote:
    > peter van der Stok <stokcons@xs4all.nl> wrote:
    >> It will be a nuisance if sets of nodes must be initialized with
    >> different
    >> Imin and Imax values to reach the same behaviour.
    >> The same problem will occur when a YANG (SMIv2) description is
    >> made for
    >> managing these parameters.

    > I think that we expect that Imax is in units of multiple of Imin,
    > which
    > is in units of TUNIT. Is that part at least, non-controversial?



    > Imax is expressed as *doublings* of Imin, which is a tighter
    > constraint than "multiple".
    > It also represents an upper bound on the interval length.

so, if the Imax field contains "5", does that mean that
   Imax = 2^5 * Imin (* TUNIT)

--
Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
IETF ROLL WG co-chair.    http://datatracker.ietf.org/wg/roll/charter/