[openstack-dev] [Neutron] VLAN trunking network for NFV

Assaf Muller amuller at redhat.com
Wed Mar 25 13:08:47 UTC 2015

----- Original Message -----
> > *From:* Ian Wells [mailto: ijw.ubuntu at cack.org.uk ] > *Sent:* Wednesday,
> > March 25, 2015 2:18 AM > > That spec ensures that you can tell what the
> > plugin is doing.  You can ask > for a VLAN transparent network, but the
> > cloud may tell you it can't make > one. > > If you want to use a VLAN
> > trunk using the current code, I recommend VXLAN > or GRE along with the
> > Linuxbridge driver, both of which support VLAN > transparent networking.
> > If they're configured and you ask for a VLAN trunk > you'll be told you
> > got one.
> The linuxbridge agent does not support GRE.
> I tried sending tagged packets over linuxbridge+VxLAN and it did not work - I
> didn't look into it any further.

This was a strong premise of the spec when it was under discussion, that we
at least some part of the reference implementation (LB + VXLAN was cited)
that works. If it doesn't, I think it's problematic to introduce new API
without a reference implementation.

> I also tried over linuxbridge+FLAT - this works when the physical switch
> ports are trunks - they would need to permit all VLAN ids to be fully "VLAN
> transparent".
> I think linuxbridge+VLAN would work too, as along as the switch ports are
> also configured for Q-in-Q.
> Currently the linuxbridge mechanism driver cannot know if a Neutron network
> is VLAN transparent or not.
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