netdev - Re: [PATCH net-next] net: change fib behavior based on interface link status

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Message-Id: <1433361846.719897.286115305.0CA7D2AA@webmail.messagingengine.com>
Date:	Wed, 03 Jun 2015 22:04:06 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Scott Feldman <sfeldma@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, ddutt@...ulusnetworks.com
Subject: Re: [PATCH net-next] net: change fib behavior based on interface link
 status

On Wed, Jun 3, 2015, at 20:27, Andy Gospodarek wrote:
> On Wed, Jun 03, 2015 at 11:15:55AM -0700, Scott Feldman wrote:
> > On Tue, Jun 2, 2015 at 8:07 PM, Andy Gospodarek
> > <gospo@...ulusnetworks.com> wrote:
> > > This feature is only enabled with the new sysctl set (default is off):
> > > net.core.kill_routes_on_linkdown = 1
> > 
> > One more thing, sorry.  This feature is typically implemented today in
> > user-space on a per-interface basis.  The example I'm thinking of is
> > Quagga's "link-detect" directive which goes on an interface.  Should
> > this be a bool on each interface in systcl?  That would let user not
> > enable on selected interfaces.
> That would not be my preference.
> 
> I'm willing to investigate the per-namespace support if Hannes would
> like and add switchdev support for v2, but would prefer this not become
> that granular.

Actually, this idea also came to my mind: flagging specific routes if
they are eligible to suppress if the link is down.

Bye,
Hannes
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