Re: [ncrg] SDN addresses control plane complexity, not data plane
Keith Jones <keith.jones@eecs.qmul.ac.uk> Thu, 14 March 2013 15:02 UTC
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From: Keith Jones <keith.jones@eecs.qmul.ac.uk>
To: Bob Briscoe <bob.briscoe@bt.com>, Dave MEYER <dmm@1-4-5.net>
Date: Thu, 14 Mar 2013 14:58:51 +0000
Thread-Topic: [ncrg] SDN addresses control plane complexity, not data plane
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References: <3AA7118E69D7CD4BA3ECD5716BAF28DF0F6EBB03@xmb-rcd-x14.cisco.com>, <201303141415.r2EEFbkN031880@bagheera.jungle.bt.co.uk>
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Cc: "ncrg@irtf.org" <ncrg@irtf.org>, Rui Aguiar <ruilaa@ua.pt>
Subject: Re: [ncrg] SDN addresses control plane complexity, not data plane
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Hi all, I am very new to SDN's and the architecture, but unlike many here, old enough to remember SS7. This whole SDN architecture reminds me of SS7 I wonder if there are any leassons we can learn from that? Feel free to shoot me down. all the best Keith "If you can not measure it, you can not improve it." Lord Kelvin ________________________________________ From: ncrg-bounces@irtf.org [ncrg-bounces@irtf.org] On Behalf Of Bob Briscoe [bob.briscoe@bt.com] Sent: 14 March 2013 14:15 To: Dave MEYER Cc: ncrg@irtf.org; Rui Aguiar Subject: [ncrg] SDN addresses control plane complexity, not data plane 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 mailing list ncrg@irtf.org https://www.irtf.org/mailman/listinfo/ncrg
- [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