David Lamparter wrote:

On Wed, Oct 12, 2011 at 01:51:22AM +0200, Arvid Brodin wrote:

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Stephen Hemminger wrote:

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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).

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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