[ovs-dev] [RFC] ofproto-dpif-xlate: Flood the updates for learning tables through peers.

[Ben Pfaff]

On Tue, Jun 18, 2019 at 05:29:30PM +0300, Ilya Maximets wrote:
> Since bridges connected via patch ports are almost the same L2 bridge,
> they should share L2 learning information in order to avoid such
> conditions.
> 
> This could be implemented by flooding of the mac learning information
> over the patch ports while updating the learning tables.
> 
> Signed-off-by: Ilya Maximets <i.maximets at samsung.com>

This idea is interesting to me because it breaks my idea of how bridges
connected by patch ports work.  My conception of such bridges has been
that they are almost completely independent; their only connection is
the patch port, which acts just like connecting two switches with a
physical cable.  I am not aware of violations of this model currently,
but I believe that this change would violate it.  I am not going to
insist on retaining the model--I do not know whether it is truly
helpful, and this patch seems beneficial--but I want to point out that
we're making a conceptual change