Centralized management / control plane. Kind of the reverse of widely dispersed per-node policy based routing.
On 10/11/13 2:47 PM, "Vytautas V Grigaliunas" <v...@fnal.gov> wrote: >What is SDN at its essence ? > > > >> Message: 9 >> Date: Fri, 11 Oct 2013 19:13:57 +0100 (BST) >> From: William Waites <wwai...@tardis.ed.ac.uk> >> To: joe...@bogus.com >> Cc: nanog@nanog.org >> Subject: Re: Policy-based routing is evil? Discuss. >> Message-ID: <20131011.191357.239591912.wwai...@tardis.ed.ac.uk> >> Content-Type: text/plain; charset="us-ascii" >> >> On Fri, 11 Oct 2013 10:41:46 -0700, joel jaeggli <joe...@bogus.com> >>said: >> >> > you take all the useful information that an IGP could be (or is) >> > providing you, and then you ignore it and do something else. >> >> Yes, that's another part of the conversation, encouraging the use of an >>IGP, >> which has been a source of trouble for them because of broken wireless >>bridges >> from a very commonly used vendor that randomly eat multicast packets, >>so it's >> not as straightforward as it should be. >> >> > evil is not a synonym for ugly patch placed over a problem that >> > could be handled better. >> >> Ok, fair enough. My first experience with PBR was as a summer intern in >>the >> mid-1990s who inherited management of a large ATM network that had a big >> VPN-esque thing built entirely that way and with no documentation. It >>certainly >> felt evil at the time. ;) >> >> -w >> >> -- >> The University of Edinburgh is a charitable body, registered in >>Scotland, with >> registration number SC005336. >
