[ncrg] SDN addresses control plane complexity, not data plane
Bob Briscoe <bob.briscoe@bt.com> Thu, 14 March 2013 14:15 UTC
Return-Path: <bob.briscoe@bt.com>
X-Original-To: ncrg@ietfa.amsl.com
Delivered-To: ncrg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix)
with ESMTP id C452B11E8180 for <ncrg@ietfa.amsl.com>;
Thu, 14 Mar 2013 07:15:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -3.599
X-Spam-Level:
X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5
tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1]
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 tHUoxx+8TFqF for
<ncrg@ietfa.amsl.com>; Thu, 14 Mar 2013 07:15:52 -0700 (PDT)
Received: from hubrelay-by-04.bt.com (hubrelay-by-04.bt.com [62.7.242.140]) by
ietfa.amsl.com (Postfix) with ESMTP id A792311E8183 for <ncrg@irtf.org>;
Thu, 14 Mar 2013 07:15:48 -0700 (PDT)
Received: from EVMHR02-UKBR.domain1.systemhost.net (193.113.108.41) by
EVMHR04-UKBR.bt.com (10.216.161.36) with Microsoft SMTP Server (TLS) id
8.3.297.1; Thu, 14 Mar 2013 14:15:47 +0000
Received: from EPHR01-UKIP.domain1.systemhost.net (147.149.196.177) by
EVMHR02-UKBR.domain1.systemhost.net (193.113.108.41) with Microsoft SMTP
Server (TLS) id 8.3.297.1; Thu, 14 Mar 2013 14:15:46 +0000
Received: from bagheera.jungle.bt.co.uk (132.146.168.158) by
EPHR01-UKIP.domain1.systemhost.net (147.149.196.177) with Microsoft SMTP
Server id 14.2.342.3; Thu, 14 Mar 2013 14:15:42 +0000
Received: from BTP075694.jungle.bt.co.uk ([10.111.51.200]) by
bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id r2EEFbkN031880;
Thu, 14 Mar 2013 14:15:39 GMT
Message-ID: <201303141415.r2EEFbkN031880@bagheera.jungle.bt.co.uk>
X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9
Date: Thu, 14 Mar 2013 14:15:37 +0000
To: Dave MEYER <dmm@1-4-5.net>
From: Bob Briscoe <bob.briscoe@bt.com>
In-Reply-To: <3AA7118E69D7CD4BA3ECD5716BAF28DF0F6EBB03@xmb-rcd-x14.cisco .com>
References: <3AA7118E69D7CD4BA3ECD5716BAF28DF0F6EBB03@xmb-rcd-x14.cisco.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158
X-Mailman-Approved-At: Thu, 14 Mar 2013 07:35:19 -0700
Cc: "ncrg@irtf.org" <ncrg@irtf.org>, Rui Aguiar <ruilaa@ua.pt>
Subject: [ncrg] SDN addresses control plane complexity, not data plane
X-BeenThere: ncrg@irtf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Network Complexity Research Group <ncrg.irtf.org>
List-Unsubscribe: <https://www.irtf.org/mailman/options/ncrg>,
<mailto:ncrg-request@irtf.org?subject=unsubscribe>
List-Archive: <http://www.irtf.org/mail-archive/web/ncrg>
List-Post: <mailto:ncrg@irtf.org>
List-Help: <mailto:ncrg-request@irtf.org?subject=help>
List-Subscribe: <https://www.irtf.org/mailman/listinfo/ncrg>,
<mailto:ncrg-request@irtf.org?subject=subscribe>
X-List-Received-Date: Thu, 14 Mar 2013 14:15:56 -0000
Dave, At one point in your talk on SDN & complexity, you pointed to just under the neck of the classic TCP/IP hourglass as the point that the originators of SDN chose to address. The message wrt complexity is really the reverse. SDN doesn't attack the narrowest (least diverse) layer, it attacks the fattest (most diverse) layer, in an attempt to narrow it to a single standard (cutting out complexity). Reason: The hour-glass represents the data plane. SDN concerns the control plane (specifically routing). The equivalent of the hour-glass in the control plane has evolved into an inverse hour-glass - a fatty-glass. See slide #8 or even #15 in Rui's presentation here: <https://www.net.t-labs.tu-berlin.de/arcadia/talks/Aguiar.pdf> or the paper: "Some comments on hour glasses" <http://dl.acm.org/citation.cfm?id=1452346> The more important a layer is for interoperability, the thinner the layer. All the different routing protocols make the control plane into a fatty-glass, because there is no /operational/ need for interop between routing protocols within different ASs. SDN attempts to narrow the control fatty-glass by standardisation of intra-domain policy-routing at build time, which implies the industry is maturing from a focus on run-time conformity (between operators) in the data plane by adding build-time conformity (between vendors) in the control plane. Bob ________________________________________________________________ Bob Briscoe, BT
- [ncrg] NCRG Meeting tomorrow Michael Behringer (mbehring)
- [ncrg] SDN addresses control plane complexity, no… Bob Briscoe
- Re: [ncrg] SDN addresses control plane complexity… David Meyer
- Re: [ncrg] SDN addresses control plane complexity… Keith Jones