[Ospf-manet] Regarding OSPF MDR
Philippe Jacquet <philippe.jacquet@inria.fr> Fri, 09 February 2007 15:52 UTC
Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1HFY31-00072D-NM; Fri, 09 Feb 2007 10:52:27 -0500
Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1HFY2z-00071w-JF for ospf-manet@ietf.org; Fri, 09 Feb 2007 10:52:25 -0500
Received: from concorde.inria.fr ([192.93.2.39]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1HFY2y-0005vv-7t for ospf-manet@ietf.org; Fri, 09 Feb 2007 10:52:25 -0500
Received: from [128.93.62.246] (dhcp-rocq-246.inria.fr [128.93.62.246]) by concorde.inria.fr (8.13.6/8.13.6) with ESMTP id l19FqFVR006651 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 9 Feb 2007 16:52:16 +0100
Message-ID: <45CC98B1.8060907@inria.fr>
Date: Fri, 09 Feb 2007 16:52:17 +0100
From: Philippe Jacquet <philippe.jacquet@inria.fr>
User-Agent: Thunderbird 1.5.0.9 (Macintosh/20061207)
MIME-Version: 1.0
To: Richard Ogier <rich.ogier@earthlink.net>
References: <45B5D944.9010303@inria.fr> <45BD37DF.1050005@earthlink.net> <45C38419.7070208@inria.fr> <45C8C704.8020908@earthlink.net>
In-Reply-To: <45C8C704.8020908@earthlink.net>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 7bit
X-Miltered: at concorde with ID 45CC98AF.001 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)!
X-Spam-Score: 0.0 (/)
X-Scan-Signature: a7d6aff76b15f3f56fcb94490e1052e4
Cc: ospf-manet@ietf.org
Subject: [Ospf-manet] Regarding OSPF MDR
X-BeenThere: ospf-manet@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions of OSPFv3 extensions supporting MANET <ospf-manet.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/ospf-manet>, <mailto:ospf-manet-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www1.ietf.org/pipermail/ospf-manet>
List-Post: <mailto:ospf-manet@ietf.org>
List-Help: <mailto:ospf-manet-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/ospf-manet>, <mailto:ospf-manet-request@ietf.org?subject=subscribe>
Errors-To: ospf-manet-bounces@ietf.org
Dear Richard, We have studied the MDR code and draft. 1. The algorithm described in the MDR draft does not provide the feature it claims: minimum cost paths in the routing table. Links are not guaranteed to be symmetrically advertized and, consequently, part of the LSAs will systematically be killed by backlink check. 2. Making a nodes LSA dependent of other nodes LSA is a source of circular dependancy. 3. The code for minCost LSA in the GTNet MDR-implementation does not implement the algorithm which is described in the MDR draft: For the option used in the simulations which you presented lately (LSAFullness=1), the code has three embedded loops that in the end make a node i to advertize a link to a node j if and only if i is the closest node to j. But this does not result in shortest path advertizements. 4. The GTNet MDR implementation artificially distorts link metrics as a way of expressing both the actual cost and the property (synchronized or not) of the link as one. This approach is, not specified in the MDR draft, so also on this point the GTNet MDR implementation and the MDR draft exhibit a significant discrepency. The preliminary conclusions are, therefore: - that the algorithms and the claims of the MDR draft do not correspond with each other; - that the MDR draft and the GTNet MDR implementation do not correspond with each other; and so: - that the simulation results presented from GTNet for the MDR-OSPF proposal correspond NEITHER to the MDR draft algorithms NOR to the properties claimed by the MDR draft. Sincerely, Philippe _______________________________________________ Ospf-manet mailing list Ospf-manet@ietf.org https://www1.ietf.org/mailman/listinfo/ospf-manet
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Emmanuel Baccelli
- [Ospf-manet] MPR-OSPF GTNetS simulations report Emmanuel Baccelli
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Emmanuel Baccelli
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Emmanuel Baccelli
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Emmanuel Baccelli
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Aniket Desai
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Philippe Jacquet
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- Re: [Ospf-manet] MPR-OSPF GTNetS simulations repo… Richard Ogier
- [Ospf-manet] Regarding OSPF MDR Philippe Jacquet
- [Ospf-manet] Re: Regarding OSPF MDR Richard Ogier
- [Ospf-manet] Re: Regarding OSPF MDR Richard Ogier
- [Ospf-manet] Re: Regarding OSPF MDR Philippe Jacquet
- [Ospf-manet] Re: Regarding OSPF MDR Richard Ogier
- [Ospf-manet] Regarding MPR-OSPF Richard Ogier