Re: NANOG Digest, Vol 69, Issue 28

[Fred Reimer <freimer () freimer org>]

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" <vyto () fnal gov> wrote:

> What is SDN at its essence ?
>
>
>
> > Message: 9
> > Date: Fri, 11 Oct 2013 19:13:57 +0100 (BST)
> > From: William Waites <wwaites () tardis ed ac uk>
> > To: joelja () bogus com
> > Cc: nanog () nanog org
> > Subject: Re: Policy-based routing is evil? Discuss.
> > Message-ID: <20131011.191357.239591912.wwaites () tardis ed ac uk>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > On Fri, 11 Oct 2013 10:41:46 -0700, joel jaeggli <joelja () 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.