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

Kerry Lynn <kerlyn@ieee.org> Mon, 17 August 2015 15:27 UTC

Return-Path: <kerlyn2001@gmail.com>
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 781D61AC417 for <roll@ietfa.amsl.com>; Mon, 17 Aug 2015 08:27:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.027
X-Spam-Level:
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 ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zh7ASbHAxAwK for <roll@ietfa.amsl.com>; Mon, 17 Aug 2015 08:27:24 -0700 (PDT)
Received: from mail-lb0-x22f.google.com (mail-lb0-x22f.google.com [IPv6:2a00:1450:4010:c04::22f]) (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 E083D1AC416 for <roll@ietf.org>; Mon, 17 Aug 2015 08:27:23 -0700 (PDT)
Received: by lbbsx3 with SMTP id sx3so84503000lbb.0 for <roll@ietf.org>; Mon, 17 Aug 2015 08:27:22 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=2yTp5ST5jcsAUzrEo3EsYXm3s/IqBLrPBPWjiybpSUM=; b=vkfsnjtLdwME5HLRfHMDZVGZHrn1kvgxnkn9lA0y3E6BpVmO4HdWZNnQ6sCkwAtI6a QO5fyrwGjTuWndipf1+R624spZqQs098ClNa/xRZDAFT0lr2D+I7khZSUjXXxwQa70M/ TuwKSNaaQxwhs78kzoBDc1W1FSL7JBkjSUB9hU5NxYNyH0YvXoz76uy1J3oRueMcbtov Wj5kG6QhhsuyuB+3XGWTXkGONyPgbR6aqnHzvEcU5WXFCWaJcuclTlbhwe09SiDjzyTJ Wfkf8l3pMrenTEVfijB7k0NmS6bGcLvWay2wfSFa7lb3xna1kMhlQM1aFqb7krVRUwvN hYUQ==
MIME-Version: 1.0
X-Received: by 10.152.20.228 with SMTP id q4mr1561842lae.74.1439825242408; Mon, 17 Aug 2015 08:27:22 -0700 (PDT)
Sender: kerlyn2001@gmail.com
Received: by 10.25.167.202 with HTTP; Mon, 17 Aug 2015 08:27:22 -0700 (PDT)
In-Reply-To: <16420.1439823867@sandelman.ca>
References: <29012.1439555277@sandelman.ca> <3ac1e1929e2d2c781db8ce08a6955e7e@xs4all.nl> <16420.1439823867@sandelman.ca>
Date: Mon, 17 Aug 2015 11:27:22 -0400
X-Google-Sender-Auth: ZnnugIBBKOURjHUv593ZdJli_sE
Message-ID: <CABOxzu08_b44EkBDTm3uE7F26x5MEHOLgBszvi1gHX93+BTb1w@mail.gmail.com>
From: Kerry Lynn <kerlyn@ieee.org>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Content-Type: multipart/alternative; boundary=089e01493a0a1ccde2051d8370c9
Archived-At: <http://mailarchive.ietf.org/arch/msg/roll/z8nm_Ec8aPaBdR2i-LHyoIeupes>
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 15:27:25 -0000

On Mon, Aug 17, 2015 at 11:04 AM, Michael Richardson <mcr+ietf@sandelman.ca>
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.

See rule 5 of RFC 6206:

5.  When the interval I expires, Trickle doubles the interval length.
    If this new interval length would be longer than the time
    specified by Imax, Trickle sets the interval length I to be the
    time specified by Imax.


Regards, Kerry

    > Suggestion: write an ERRATA document for RFC6206 which then solves
>     > draft-ietf-roll-trickle-mcast-12 issue.
>
> I think that 6206 doesn't care what units are expressed internally.
> Do any math in 6206 depend upon an integer multiple relationship between
> Imin
> and Imax?
>
>
> --
> Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
> IETF ROLL WG co-chair.    http://datatracker.ietf.org/wg/roll/charter/
>
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>
>