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

Anil Venkata anilvenkata at redhat.com
Tue Feb 27 11:13:57 UTC 2018

For example, I have a network and a load balancer is added to
it with as VIP and 50:54:00:00:00:01),
50:54:00:00:00:02) as members.
ovn-nbctl  create load_balancer vips:","

 When I try to send a request from client within the subnet(i.e
its not reaching any load balancer members.
I noticed ARP not resolved for VIP

I tried to resolve this in two ways
1) Adding a new ARP reply ovs flow for VIP with router port's
MAC. When client tries to connect VIP, it will use router's MAC. Now router
gets the packet after load balancing, and will forward the packet to
appropriate member.

2) Second approach,
   a) Using a new MAC(example, 50:54:00:00:00:ab) for VIP, and
adding a new ARP reply flow with this MAC.
   b) As we are not using router, when load balancing changes destination
ip, VIP MAC has to be replaced with corresponding member's MAC i.e
      sudo ovs-ofctl add-flow br-int
sudo ovs-ofctl add-flow br-int

Which approach will be better or is there any alternate solution?

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