netdev - Re: bridge: HSR support

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Message-ID: <20111012132822.GJ2840382@jupiter.n2.diac24.net>
Date:	Wed, 12 Oct 2011 15:28:22 +0200
From:	David Lamparter <equinox@...c24.net>
To:	Arvid Brodin <arvid.brodin@...a.com>
Cc:	netdev@...r.kernel.org, Stephen Hemminger <shemminger@...tta.com>,
	Lennert Buytenhek <kernel@...tstofly.org>
Subject: Re: bridge: HSR support

On Wed, Oct 12, 2011 at 01:51:22AM +0200, Arvid Brodin wrote:
> Stephen Hemminger wrote:
> >> I want to add support for HSR ("High-availability Seamless Redundancy",
> >> IEC-62439-3) to the bridge code. With HSR, all connected units have two network
> >> ports and are connected in a ring. All new Ethernet packets are sent on both
> >> ports (or passed through if the current unit is not the originating unit).


> >> The same packet is never passed twice.

How does the bridge decide whether a packet is arriving the second time?
Is the ring pre-resolved to stop things or does this happen per-packet?


-David
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