Re: [Roll] [roll] #95: Why need stop flag? Is the receipt of DRO not sufficient to indicate completion of route discovery?
C Chauvenet <c.chauvenet@watteco.com> Tue, 10 April 2012 16:32 UTC
Return-Path: <c.chauvenet@watteco.com>
X-Original-To: roll@ietfa.amsl.com
Delivered-To: roll@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8CA3C21F856F for <roll@ietfa.amsl.com>; Tue, 10 Apr 2012 09:32:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.099
X-Spam-Level:
X-Spam-Status: No, score=-5.099 tagged_above=-999 required=5 tests=[AWL=1.500, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1+qMON1O88k8 for <roll@ietfa.amsl.com>; Tue, 10 Apr 2012 09:32:23 -0700 (PDT)
Received: from va3outboundpool.messaging.microsoft.com (va3ehsobe006.messaging.microsoft.com [216.32.180.16]) by ietfa.amsl.com (Postfix) with ESMTP id 7F00C21F856A for <roll@ietf.org>; Tue, 10 Apr 2012 09:32:14 -0700 (PDT)
Received: from mail130-va3-R.bigfish.com (10.7.14.245) by VA3EHSOBE008.bigfish.com (10.7.40.28) with Microsoft SMTP Server id 14.1.225.23; Tue, 10 Apr 2012 16:32:13 +0000
Received: from mail130-va3 (localhost [127.0.0.1]) by mail130-va3-R.bigfish.com (Postfix) with ESMTP id 6A1D03C0522; Tue, 10 Apr 2012 16:32:13 +0000 (UTC)
X-SpamScore: -73
X-BigFish: VPS-73(z4b6Kzc89bh15caKJzz1202hzz1033IL8275bh8275dhz2dh2a8h668h839h93fhd25h)
X-Forefront-Antispam-Report: CIP:157.56.248.181; KIP:(null); UIP:(null); IPV:NLI; H:AMXPRD0510HT002.eurprd05.prod.outlook.com; RD:none; EFVD:NLI
Received: from mail130-va3 (localhost.localdomain [127.0.0.1]) by mail130-va3 (MessageSwitch) id 1334075530918515_8769; Tue, 10 Apr 2012 16:32:10 +0000 (UTC)
Received: from VA3EHSMHS030.bigfish.com (unknown [10.7.14.254]) by mail130-va3.bigfish.com (Postfix) with ESMTP id D8BA3100095; Tue, 10 Apr 2012 16:32:10 +0000 (UTC)
Received: from AMXPRD0510HT002.eurprd05.prod.outlook.com (157.56.248.181) by VA3EHSMHS030.bigfish.com (10.7.99.40) with Microsoft SMTP Server (TLS) id 14.1.225.23; Tue, 10 Apr 2012 16:32:09 +0000
Received: from AMXPRD0510MB390.eurprd05.prod.outlook.com ([169.254.3.137]) by AMXPRD0510HT002.eurprd05.prod.outlook.com ([10.255.57.37]) with mapi id 14.16.0143.004; Tue, 10 Apr 2012 16:32:07 +0000
From: C Chauvenet <c.chauvenet@watteco.com>
To: 'Mukul Goyal' <mukul@uwm.edu>
Thread-Topic: [Roll] [roll] #95: Why need stop flag? Is the receipt of DRO not sufficient to indicate completion of route discovery?
Thread-Index: AQHNEx32hh4lWAafiEaDmA/VlsX0qpaMTC1wgAUtcwCAAs5AkA==
Date: Tue, 10 Apr 2012 16:32:07 +0000
Message-ID: <97B69B30E0EF244B940B65EA541E3F2D0221AE6D@AMXPRD0510MB390.eurprd05.prod.outlook.com>
References: <97B69B30E0EF244B940B65EA541E3F2D022166C5@AMXPRD0510MB390.eurprd05.prod.outlook.com> <1278156449.1852161.1333921106641.JavaMail.root@mail17.pantherlink.uwm.edu>
In-Reply-To: <1278156449.1852161.1333921106641.JavaMail.root@mail17.pantherlink.uwm.edu>
Accept-Language: fr-FR, en-US
Content-Language: fr-FR
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [10.3.4.8]
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: watteco.com
Cc: "roll@ietf.org" <roll@ietf.org>
Subject: Re: [Roll] [roll] #95: Why need stop flag? Is the receipt of DRO not sufficient to indicate completion of route discovery?
X-BeenThere: roll@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
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: Tue, 10 Apr 2012 16:32:24 -0000
Inline, -----Message d'origine----- De : Mukul Goyal [mailto:mukul@uwm.edu] Envoyé : dimanche 8 avril 2012 23:38 À : C Chauvenet Cc : roll@ietf.org; jpv@cisco.com Objet : Re: [Roll] [roll] #95: Why need stop flag? Is the receipt of DRO not sufficient to indicate completion of route discovery? Hi Cedric Please see the response inline. Thanks Mukul #95: Why need stop flag? Is the receipt of DRO not sufficient to indicate completion of route discovery? Resolution: No because multiple DROs would be generated if multiple source routes are being discovered. Discussion: p15 : Stop (S): This flag, when set to one by a target, indicates that the P2P-RPL route discovery is over. [Cedric] Is this bit really usefull ? My guess is that it will be always set to 1. If you hear a DRO, this indeed means that the RDO has reached the target, so you could just stop processing RDO when you hear a DRO. Do we really need a flag to stop RDO processing or the hearing of a DRO type message could do the job ? [Mukul] A P2P-RPL invocation might involve discovery of multiple source routes. In that case, receipt of a DRO does not mean route discovery is over. Only when the target sets the stop flag in the DRO, a node could be sure that the route discovery is over. [Cedric2] OK fo multiple discovery. But if I want to discover a route to a multicast group of target. I set a multicast adress in the target field of the RDO. Then, do I received as many DRO message as the number of target reached ? In that case, would the first DRO with a "S" flag stop the RDO propagation to reach all the target included in the multicast group ? [Mukul2] A target cannot set the S flag to one in the DRO if the target address in the P2P-RDO specified a multicast address. See the following text at the end of page 21 in P2P-RPL-9: "The target MAY set the stop flag inside the DRO message to one if Goyal, et al. Expires September 7, 2012 [Page 21] Internet-Draft draft-ietf-roll-p2p-rpl-09 March 2012 o this router is the only target specified in the corresponding DIO, i.e., the corresponding DIO specified a unicast address of the router as the Target inside the P2P-RDO with no additional targets specified via RPL Target Options; and " [Cedric3] So how do you stop the RDO flooding when the target adress is mulicast ? -- -----------------------------------+--------------------- Reporter: jpv@… | Owner: mukul@… Type: defect | Status: new Priority: major | Milestone: Component: p2p-rpl | Version: Severity: Submitted WG Document | Keywords: -----------------------------------+--------------------- Ticket URL: <http://trac.tools.ietf.org/wg/roll/trac/ticket/95> roll <http://tools.ietf.org/wg/roll/> _______________________________________________ Roll mailing list Roll@ietf.org https://www.ietf.org/mailman/listinfo/roll
- [Roll] [roll] #95: Why need stop flag? Is the rec… roll issue tracker
- Re: [Roll] [roll] #95: Why need stop flag? Is the… C Chauvenet
- Re: [Roll] [roll] #95: Why need stop flag? Is the… Mukul Goyal
- Re: [Roll] [roll] #95: Why need stop flag? Is the… C Chauvenet
- Re: [Roll] [roll] #95: Why need stop flag? Is the… Mukul Goyal
- Re: [Roll] [roll] #95: Why need stop flag? Is the… C Chauvenet
- Re: [Roll] [roll] #95: Why need stop flag? Is the… Mukul Goyal
- Re: [Roll] [roll] #95: Why need stop flag? Is the… C Chauvenet
- Re: [Roll] [roll] #95: Why need stop flag? Is the… Mukul Goyal
- Re: [Roll] [roll] #95: Why need stop flag? Is the… C Chauvenet
- [Roll] Closure text for Ticket #95 Mukul Goyal
- Re: [Roll] [roll] #95: Why need stop flag? Is the… roll issue tracker