diff --git a/tests/system-ovn.at b/tests/system-ovn.at
index b58a5b7..d22d79b 100644
--- a/tests/system-ovn.at
+++ b/tests/system-ovn.at
@@ -139,3 +139,111 @@ OVS_APP_EXIT_AND_WAIT([ovn-northd])
 as
 OVS_TRAFFIC_VSWITCHD_STOP(["/failed to query port patch-.*/d"])
 AT_CLEANUP
+
+
+AT_SETUP([ovn -- load-balancing])
+AT_KEYWORDS([ovnlb])
+ovn_start
+
+OVS_TRAFFIC_VSWITCHD_START()
+ADD_BR([br-int])
+
+# Set external-ids in br-int needed for ovn-controller
+ovs-vsctl \
+        -- set Open_vSwitch . external-ids:system-id=hv1 \
+        -- set Open_vSwitch . external-ids:ovn-remote=unix:$ovs_base/ovn-sb/ovn-sb.sock \
+        -- set Open_vSwitch . external-ids:ovn-encap-type=geneve \
+        -- set Open_vSwitch . external-ids:ovn-encap-ip=169.0.0.1 \
+        -- set bridge br-int fail-mode=secure other-config:disable-in-band=true
+
+# Start ovn-controller
+start_daemon ovn-controller
+
+# Logical network:
+# 2 logical switches "foo" (192.168.1.0/24) and "bar" (172.16.1.0/24)
+# connected to a router R1.
+# foo has foo1 to act as a client.
+# bar has bar1, bar2, bar3 to act as servers.
+#
+# Loadbalancer VIPs in 30.0.0.0/24 network.
+
+ovn-nbctl create Logical_Router name=R1
+ovn-nbctl ls-add foo
+ovn-nbctl ls-add bar
+
+# Connect foo to R1
+ovn-nbctl lrp-add R1 foo 00:00:01:01:02:03 192.168.1.1/24
+ovn-nbctl lsp-add foo rp-foo -- set Logical_Switch_Port rp-foo \
+    type=router options:router-port=foo addresses=\"00:00:01:01:02:03\"
+
+# Connect bar to R1
+ovn-nbctl lrp-add R1 bar 00:00:01:01:02:04 172.16.1.1/24
+ovn-nbctl lsp-add bar rp-bar -- set Logical_Switch_Port rp-bar \
+    type=router options:router-port=bar addresses=\"00:00:01:01:02:04\"
+
+# Create logical port 'foo1' in switch 'foo'.
+ADD_NAMESPACES(foo1)
+ADD_VETH(foo1, foo1, br-int, "192.168.1.2/24", "f0:00:00:01:02:03", \
+         "192.168.1.1")
+ovn-nbctl lsp-add foo foo1 \
+-- lsp-set-addresses foo1 "f0:00:00:01:02:03 192.168.1.2"
+
+# Create logical ports 'bar1', 'bar2', 'bar3' in switch 'bar'.
+ADD_NAMESPACES(bar1)
+ADD_VETH(bar1, bar1, br-int, "172.16.1.2/24", "f0:00:0f:01:02:03", \
+         "172.16.1.1")
+ovn-nbctl lsp-add bar bar1 \
+-- lsp-set-addresses bar1 "f0:00:0f:01:02:03 172.16.1.2"
+
+ADD_NAMESPACES(bar2)
+ADD_VETH(bar2, bar2, br-int, "172.16.1.3/24", "f0:00:0f:01:02:04", \
+         "172.16.1.1")
+ovn-nbctl lsp-add bar bar2 \
+-- lsp-set-addresses bar2 "f0:00:0f:01:02:04 172.16.1.3"
+
+ADD_NAMESPACES(bar3)
+ADD_VETH(bar3, bar3, br-int, "172.16.1.4/24", "f0:00:0f:01:02:05", \
+         "172.16.1.1")
+ovn-nbctl lsp-add bar bar3 \
+-- lsp-set-addresses bar3 "f0:00:0f:01:02:05 172.16.1.4"
+
+# Config OVN load-balancer.
+uuid=`ovn-nbctl  create load_balancer vips:30.0.0.1="172.16.1.2,172.16.1.3,172.16.1.4"`
+ovn-nbctl set logical_switch foo load_balancer=$uuid
+
+# Wait for ovn-controller to catch up.
+sleep 2
+
+# Start webservers in 'bar1', 'bar2' and 'bar3'.
+NETNS_DAEMONIZE([bar1], [[$PYTHON $srcdir/test-l7.py]], [http1.pid])
+NETNS_DAEMONIZE([bar2], [[$PYTHON $srcdir/test-l7.py]], [http2.pid])
+NETNS_DAEMONIZE([bar3], [[$PYTHON $srcdir/test-l7.py]], [http3.pid])
+
+dnl Should work with the virtual IP address through NAT
+for i in 1 2 3 4 5 6 7 8 9 10 11 12; do
+    echo Request $i
+    NS_CHECK_EXEC([foo1], [wget 30.0.0.1 -t 5 -T 1 --retry-connrefused -v -o wget$i.log])
+done
+
+dnl Each server should have at least one connection.
+AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(30.0.0.1)], [0], [dnl
+tcp,orig=(src=192.168.1.2,dst=30.0.0.1,sport=<cleared>,dport=<cleared>),reply=(src=172.16.1.2,dst=192.168.1.2,sport=<cleared>,dport=<cleared>),protoinfo=(state=<cleared>)
+tcp,orig=(src=192.168.1.2,dst=30.0.0.1,sport=<cleared>,dport=<cleared>),reply=(src=172.16.1.3,dst=192.168.1.2,sport=<cleared>,dport=<cleared>),protoinfo=(state=<cleared>)
+tcp,orig=(src=192.168.1.2,dst=30.0.0.1,sport=<cleared>,dport=<cleared>),reply=(src=172.16.1.4,dst=192.168.1.2,sport=<cleared>,dport=<cleared>),protoinfo=(state=<cleared>)
+])
+
+
+OVS_APP_EXIT_AND_WAIT([ovn-controller])
+
+as ovn-sb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as ovn-nb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as northd
+OVS_APP_EXIT_AND_WAIT([ovn-northd])
+
+as
+OVS_TRAFFIC_VSWITCHD_STOP(["/failed to query port patch-.*/d"])
+AT_CLEANUP
