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

Guru Shetty guru at ovn.org
Fri Mar 9 22:58:51 UTC 2018


On 9 March 2018 at 11:19, Ben Pfaff <blp at ovn.org> wrote:

> 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.
>
I sent a patch:
https://patchwork.ozlabs.org/patch/884054/
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