[ovs-discuss] Turn bridge into a HUB

Luiz Angelo Daros de Luca luizluca at gmail.com
Tue Mar 20 16:30:38 UTC 2018

Thanks Ben,

And how about vlan tags? Will it preserve them? Or should I set a "native
vlan" for both in and out ports?

There is no "regular vlan" on this bridge. It is for flooding only.

Em seg, 19 de mar de 2018 às 17:31, Ben Pfaff <blp at ovn.org> escreveu:

> On Mon, Mar 19, 2018 at 07:58:40PM +0000, Luiz Angelo Daros de Luca wrote:
> > Hello,
> >
> > I have a physical port receives traffic from mirrored ports in a physical
> > (core) switch. I would like to pass these packets to multiple VMs (xen),
> > replicating vlan tags when existing.
> >
> > With linux bridges, I set aging to 0 and, as it does not understand vlan
> > tags, everything works. Now I want to setup the same situation with ovs.
> > I'm still a newbie with ovs.
> >
> > Xen uses the /etc/xen/scripts/vif-openvswitch that allows me to specify
> tag
> > and trunk argument when a vm port is added (not much besides that). As I
> > might receive multiple vlans, I would like to not list all of them.
> >
> > I saw that flood_vlans might be useful. I simply need to flood all
> traffic
> > from the physical port on every other port but the physical one,
> > replicating vlan tags.
> You could set this up with flood_vlans, but you would have to list the
> vlans.  ovs-vsctl supports ranges, so you could probably do this easily,
> e.g.:
>         ovs-vsctl set bridge br0 flood_vlans=1-4095
> Another way to do this would be to add flows or to use a controller to
> add flows.  All you really need is a high-priority flow that does normal
> processing for your "regular vlan" and another one that falls back to
> flooding, e.g.:
> priority=50000, vlan_vid=1234, actions=normal
> priority=40000, actions=flood

Luiz Angelo Daros de Luca
luizluca at gmail.com
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