[166189] in North American Network Operators' Group
Re: Policy-based routing is evil? Discuss.
daemon@ATHENA.MIT.EDU (Fred Reimer)
Fri Oct 11 14:45:49 2013
From: Fred Reimer <freimer@freimer.org>
To: Jay Ashworth <jra@baylink.com>, NANOG <nanog@nanog.org>
Date: Fri, 11 Oct 2013 18:41:20 +0000
In-Reply-To: <11147102.1237.1381516394361.JavaMail.root@benjamin.baylink.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I think they are referring to something like Cisco PBR, where you
configure routing policy statically on each hop. Yes, it can be
configured to fail over, etc, but inherently it is a management nightmare
if you are configuring PBR on each device in your network. May as well
move back to static routing on everything=8A
Used sparingly, I'd agree that it does have its uses. One use I can think
of is to use PBR to direct traffic for testing a new circuit or path while
not cutting everything over. That is, until it is sufficiently tested,
and then everything would be cut over and the PBR removed=8A
On 10/11/13 2:33 PM, "Jay Ashworth" <jra@baylink.com> wrote:
>----- Original Message -----
>> From: "joel jaeggli" <joelja@bogus.com>
>> you take all the useful information that an IGP could be (or is)
>> providing you, and then you ignore it and do something else.
>
>Well, I tell you what.
>
>My perception of where this was a good idea is the use case a recent
>client might have for it:
>
>Two consumer-grade uplinks (FiOS 150 and RR 100, specifically); primary
>application is callcenter, VoIP to a service provider Elsewhere.
>
>I would set it up so that all the VoIP and callcenter web traffic went
>over
>FiOS *until it failed*, and everything else went Road Runner *unless it
>failed*.=20
>
>This keeps the general traffic out of the hair of the latency/PPS
>sensitive
>traffic whenever possible.
>
>Is that not policy-based routing?
>
>Why is it bad?
>
>Cheers,
>-- jra
>--=20
>Jay R. Ashworth Baylink
>jra@baylink.com
>Designer The Things I Think RFC
>2100
>Ashworth & Associates http://baylink.pitas.com 2000 Land
>Rover DII
>St Petersburg FL USA #natog +1 727 647
>1274
>
