[166212] in North American Network Operators' Group
Re: Policy-based routing is evil? Discuss.
daemon@ATHENA.MIT.EDU (Jimmy Hess)
Sat Oct 12 13:58:41 2013
In-Reply-To: <52598B53.3030502@alvarezp.ods.org>
Date: Sat, 12 Oct 2013 12:58:30 -0500
From: Jimmy Hess <mysidia@gmail.com>
To: Octavio Alvarez <alvarezp@alvarezp.ods.org>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sat, Oct 12, 2013 at 12:48 PM, Octavio Alvarez <alvarezp@alvarezp.ods.org
> wrote:
> This depends on how flexible the PBR implementation on your router is.
> If your router can have conditionals like this:
>
> * match: source address A && link P available --> send it to link P
> * match: source address A --> unconditionally send it to fallback link F
>
It doesn't necessarily have to be that complex OR brittle.
I would suggest the use of recursive next-hop with PBR to the loopback
/32 of a peer router that is not associated with a directly connected
network.
If that /32 route happens to be down, then the recursive lookup of
the next-hop results in a lookup of the default route.
--
-JH
