netdev - Re: bridge: HSR support

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Message-ID: <4E95A332.1040806@enea.com>
Date:	Wed, 12 Oct 2011 16:24:50 +0200
From:	Arvid Brodin <arvid.brodin@...a.com>
To:	David Lamparter <equinox@...c24.net>
CC:	<netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Lennert Buytenhek <kernel@...tstofly.org>
Subject: Re: bridge: HSR support


David Lamparter wrote:
> 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?

It happens per-packet. I believe a combination of source MAC address and the HSR
sequence tag is used to identify duplicates.

-- 
Arvid Brodin
Enea Services Stockholm AB
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