NANOG Digest, Vol 69, Issue 28

Fri Oct 11 18:55:01 UTC 2013

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 at 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 at tardis.ed.ac.uk>
>> To: joelja at bogus.com
>> Cc: nanog at nanog.org
>> Subject: Re: Policy-based routing is evil? Discuss.
>> Message-ID: <20131011.191357.239591912.wwaites at tardis.ed.ac.uk>
>> Content-Type: text/plain; charset="us-ascii"
>> 
>> On Fri, 11 Oct 2013 10:41:46 -0700, joel jaeggli <joelja at 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.
>