[ovs-discuss] OVN load balancing on same subnet failing

[Ben Pfaff]

On Fri, Mar 02, 2018 at 09:40:07AM -0800, Guru Shetty wrote:
> On 1 March 2018 at 21:09, Anil Venkata <anilvenkata at redhat.com> wrote:
> 
> >
> >
> > On Fri, Mar 2, 2018 at 7:23 AM, Guru Shetty <guru at ovn.org> wrote:
> >
> >>
> >>
> >> On 27 February 2018 at 03:13, Anil Venkata <anilvenkata at redhat.com>
> >> wrote:
> >>
> >>> For example, I have a 10.1.0.0/24 network and a load balancer is added
> >>> to it with 10.1.0.10 as VIP and 10.1.0.2(MAC 50:54:00:00:00:01),
> >>> 10.1.0.3(MAC 50:54:00:00:00:02) as members.
> >>> ovn-nbctl  create load_balancer vips:10.1.0.10="10.1.0.2,10.1.0.3"
> >>>
> >>
> >> We currently need the VIP to be in a different subnet. You should connect
> >> switch it to a dummy logical router (or connect it to a external router).
> >> Since a VIP is in a different subnet, it sends an ARP for logical router IP
> >> and then things will work.
> >>
> >>
> >
> > Thanks Guru. Any reason for introducing this constraint(i.e VIP to be in a
> > different subnet)? Can we address this limitation?
> >
> 
> It was just easy to implement with the constraint. You will need a ARP
> responder for the VIP. And now, you will have to specify the mac address
> for each VIP in the schema. So that is a bit of work - but not hard.

Do we document the constraint?  If we do not, then that would be
helpful.