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.
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.
participants (2)
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Fred Reimer -
Vytautas V Grigaliunas