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Date:	Tue, 18 Aug 2015 09:08:42 +0000
From:	Premkumar Jonnala <>
To:	"Rosen, Rami" <>,
	roopa <>
CC:	"" <>
Subject: RE: [PATCH] bridge: Enable configuration of ageing interval for
 bridges and switch devices.

> -----Original Message-----
> From: Rosen, Rami []
> Sent: Tuesday, August 18, 2015 10:25 AM
> To: Premkumar Jonnala; roopa
> Cc:
> Subject: RE: [PATCH] bridge: Enable configuration of ageing interval for bridges
> and switch devices.
> Hi,
> First, I agree about the need to propagate the ageing interval to switchdev
> devices, so that hardware based aging can be setup correctly.
> Second, in this occasion, I want to mention the need to
> turn off bridge ageing in the kernel as part of using switchdev devices. This is
> mentioned in
> next/+/master/Documentation/networking/switchdev.txt:
> ...
> XXX: how to turn off ageing in kernel on a per-port basis or
> otherwise prevent the kernel from ageing out the FDB entry?
> ...
> One can think of the option of using value 0 of the ageing interval as an
> indication to turn off bridge ageing in the kernel, and any other value bigger
> than MIN_AGEING_INTERVAL_SECS to turn on bridge ageing.

I recall that there was a patch proposed to prevent ageing of fdb entried by bridge in kernel,
when the fdb entry was added due to notification by switch device.  Please see:

Somehow the patch is not visible in the net-next pull.


> As another option for a *per-port* boolean flag for enabling/disabling ageing,
> one can think of adding an IFLA_BRPORT_AGEING bool flag (and BR_AGEING)
> Regards,
> Rami Rosen
> Intel Corporation

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