IETF Logo Mail Archive

Re: [Roll] Support of flow label to carry the RPL information in data packets

Yvonne-Anne Pignolet <yvonne-anne.pignolet@ch.abb.com> Thu, 24 April 2014 12:02 UTC

Return-Path: <yvonne-anne.pignolet@ch.abb.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 0EB2A1A01B0 for <roll@ietfa.amsl.com>; Thu, 24 Apr 2014 05:02:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.6
X-Spam-Level:
X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001] 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 VSoh58D2iR2W for <roll@ietfa.amsl.com>; Thu, 24 Apr 2014 05:02:21 -0700 (PDT)
Received: from emea01-am1-obe.outbound.protection.outlook.com (mail-am1lp0013.outbound.protection.outlook.com [213.199.154.13]) by ietfa.amsl.com (Postfix) with ESMTP id 86CD51A0188 for <roll@ietf.org>; Thu, 24 Apr 2014 05:02:19 -0700 (PDT)
Received: from DB4PR06MB047.eurprd06.prod.outlook.com (10.242.154.154) by DB4PR06MB047.eurprd06.prod.outlook.com (10.242.154.154) with Microsoft SMTP Server (TLS) id 15.0.921.12; Thu, 24 Apr 2014 12:02:12 +0000
Received: from DB4PR06MB047.eurprd06.prod.outlook.com ([169.254.14.143]) by DB4PR06MB047.eurprd06.prod.outlook.com ([169.254.14.143]) with mapi id 15.00.0921.000; Thu, 24 Apr 2014 12:02:12 +0000
From: Yvonne-Anne Pignolet <yvonne-anne.pignolet@ch.abb.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Support of flow label to carry the RPL information in data packets
Thread-Index: Ac9Ytmat6NKNjUbmSRm2LxYz56eW1gG62P6g
Date: Thu, 24 Apr 2014 12:02:12 +0000
Message-ID: <3f7c68ebd0a54675b4d5337ab6def524@DB4PR06MB047.eurprd06.prod.outlook.com>
References: <E045AECD98228444A58C61C200AE1BD8425ECDA6@xmb-rcd-x01.cisco.com>
In-Reply-To: <E045AECD98228444A58C61C200AE1BD8425ECDA6@xmb-rcd-x01.cisco.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [212.35.31.96]
x-forefront-prvs: 01917B1794
x-forefront-antispam-report: SFV:NSPM; SFS:(10019001)(428001)(189002)(199002)(81342001)(83322001)(81542001)(19580395003)(66066001)(76482001)(99396002)(86362001)(80022001)(19580405001)(46102001)(77982001)(15975445006)(20776003)(79102001)(76176999)(4396001)(74316001)(224303002)(224313003)(74502001)(2656002)(54356999)(19300405004)(76576001)(74662001)(33646001)(83072002)(31966008)(80976001)(15202345003)(50986999)(85852003)(16236675002)(87936001)(92566001)(19609705001)(24736002); DIR:OUT; SFP:1102; SCL:1; SRVR:DB4PR06MB047; H:DB4PR06MB047.eurprd06.prod.outlook.com; FPR:DCE460BF.9BFA9C91.B3D53D53.C6E5ED71.20329; MLV:sfv; PTR:InfoNoRecords; MX:1; A:0; LANG:en;
received-spf: None (: ch.abb.com does not designate permitted sender hosts)
Content-Type: multipart/alternative; boundary="_000_3f7c68ebd0a54675b4d5337ab6def524DB4PR06MB047eurprd06pro_"
MIME-Version: 1.0
X-OriginatorOrg: ch.abb.com
Archived-At: http://mailarchive.ietf.org/arch/msg/roll/09k0NO_bhY4RFtDL6S3JGsg5DSE
Subject: Re: [Roll] Support of flow label to carry the RPL information in data packets
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: <http://www.ietf.org/mail-archive/web/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: Thu, 24 Apr 2014 12:02:25 -0000

+1

From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Pascal Thubert (pthubert)
Sent: Dienstag, 15. April 2014 16:25
To: 6tisch@ietf.org; roll
Subject: [Roll] Support of flow label to carry the RPL information in data packets

Dear all:

As some of you remember, the RPL specification has changed over time WRT to the location of the information that RPL places in the data packets. We started with the flow label but these were the days when what became RFC 6437 was being defined at 6MAN, so we shied away and defined the HbH technique that is now specified as RFC 6553.

We'll note that the RPL option defined in RFC 6553 takes 6 octets, and with the HbH hdr we end up with 8 extra octets. An extra IP-in-IP encapsulation is required on top of that unless both endpoints are in the same RPL domain. All this overhead may be acceptable when power is available and the PHY allows for larger frames, but in traditional battery-operated 15.4 with ~ 80 bytes usable per frame, my experience from integrating 6LoWPAN HC with ISA100.11a says that all these extra bytes will be on the way of the 6TiSCH adoption.

Still, both RFC 6550 and RFC 6552 are designed to allow for an alternate technique and in particular for the use of the flow label, as is elaborated in http://tools.ietf.org/html/draft-thubert-roll-flow-label-02 . Using the flow label reduces the cost of the RPL information dramatically, down to a level that is probably acceptable for the target SDOs.

So my plan for now is to move the flow label draft to 6MAN and prepare for a hot season, and I'm looking for support from both 6TiSCH and ROLL to back me up from the start.  Yes, you can help!

Please +1 if you agree we need this work to happen, and/or provide any suggestion.

Cheers,

Pascal

v2.23.0 | Report a Bug | By Email