From: Dumitru Ceara <[email protected]>

In the OVN logical switch pipeline, broadcast ARP requests (and ND_NS)
generated by VIFs and by router ports are also flooded into the per switch
MC_FLOOD_L2 multicast group which includes all non-router ports of the
switch.
In deployments with large logical broadcast domains (logical switches with
a significantly large number of switch ports, e.g. 200+) this becomes a
problem because the MC_FLOOD_L2 multicast group has a lot of ports so the
chain of the OpenFlow tables that the packet needs to traverse for full
processing becomes really long, going over OVS' 4K resubmit limit and
causing the packet to be dropped.
The main reason why the ARP packets are currently sent to all non-router
ports is to allow the workloads to learn the mapping between arp.spa
(source IP) and arp.sha (source MAC). However, that's just an optimization,
which might avoid future ARP requests from other workloads; and it's not a
requirement, nothing would really break if we didn't forward those packets
to all other VIFs.
It's probably acceptable to change the behavior and just forward these ARP
requests to the ports that have LSP.addresses="unknown" as the workloads
behind those ports (or the fabric for the localnet case) might actually own
the arp.tpa target IP.

Reported-at: https://redhat.atlassian.net/browse/FDP-3439
Co-authored-by: Lorenzo Bianconi <[email protected]>
Signed-off-by: Lorenzo Bianconi <[email protected]>
Signed-off-by: Dumitru Ceara <[email protected]>
---
 northd/northd.c         |   6 +-
 northd/ovn-northd.8.xml |   6 +-
 ovs                     |   2 +-
 tests/ovn-northd.at     | 142 ++++++++++++++++++++--------------------
 tests/ovn.at            |   2 +
 5 files changed, 80 insertions(+), 78 deletions(-)

diff --git a/northd/northd.c b/northd/northd.c
index 0b52db6cf..a12cb8251 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -9609,7 +9609,7 @@ build_lswitch_rport_arp_req_flow(
      */
     if (vector_len(&od->router_ports) != od->nbs->n_ports) {
         ds_put_format(&actions, "clone {outport = %s; output; }; "
-                                "outport = \""MC_FLOOD_L2"\"; output;",
+                                "outport = \""MC_UNKNOWN"\"; output;",
                       patch_op->json_key);
         ovn_lflow_add(lflows, od, S_SWITCH_IN_L2_LKUP, priority,
                       ds_cstr(&match), ds_cstr(&actions), lflow_ref,
@@ -9628,7 +9628,7 @@ build_lswitch_rport_arp_req_flow(
         ds_clear(&actions);
         if (vector_len(&od->router_ports) != od->nbs->n_ports) {
             ds_put_format(&actions, "clone {outport = %s; output; }; "
-                                    "outport = \""MC_FLOOD_L2"\"; output;",
+                                    "outport = \""MC_UNKNOWN"\"; output;",
                           patch_op->cr_port->json_key);
             ovn_lflow_add(lflows, od, S_SWITCH_IN_L2_LKUP, priority,
                           ds_cstr(&match), ds_cstr(&actions), lflow_ref,
@@ -11061,7 +11061,7 @@ build_lswitch_destination_lookup_bmcast(struct 
ovn_datapath *od,
                        "broadcast-arps-to-all-routers", true)) {
         ovn_lflow_add(lflows, od, S_SWITCH_IN_L2_LKUP, 72,
                       "eth.mcast && (arp.op == 1 || nd_ns)",
-                      "outport = \""MC_FLOOD_L2"\"; output;",
+                      "outport = \""MC_UNKNOWN"\"; output;",
                       lflow_ref);
     }
 
diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml
index 4d6370da6..8402f388b 100644
--- a/northd/ovn-northd.8.xml
+++ b/northd/ovn-northd.8.xml
@@ -2402,8 +2402,8 @@ output;
         router port connected to the switch. These flows match ARP requests
         and ND packets for the specific IP addresses.  Matched packets are
         forwarded only to the router that owns the IP address and to the
-        <code>MC_FLOOD_L2</code> multicast group which contains all non-router
-        logical ports.
+        <code>MC_UNKNOWN</code> multicast group which contains all enabled
+        logical ports that accept unknown destination packets.
       </li>
 
       <li>
@@ -2426,7 +2426,7 @@ output;
       <li>
         A priority-72 flow that outputs all ARP requests and ND NS (Neighbor
         Solicitation) packets with an Ethernet broadcast or multicast
-        <code>eth.dst</code> to the <code>MC_FLOOD_L2</code> multicast group
+        <code>eth.dst</code> to the <code>MC_UNKNOWN</code> multicast group
         if <code>other_config:broadcast-arps-to-all-routers=false</code>.
       </li>
 
diff --git a/ovs b/ovs
index bdb95cc19..6aefe1db3 160000
--- a/ovs
+++ b/ovs
@@ -1 +1 @@
-Subproject commit bdb95cc1920d4ab66fe062a9470eeb33a51d33e2
+Subproject commit 6aefe1db31e3df4e7b64c21f54a7287e4663e1e4
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 1d7bd6c28..bf2b857f5 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -5867,8 +5867,8 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 ovn-sbctl lflow-list ls2 > ls2_lflows
@@ -5883,8 +5883,8 @@ AT_CHECK([grep "ls_in_l2_lkup" ls2_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:02:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 AS_BOX([Adding some reachable NAT addresses])
@@ -5907,10 +5907,10 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 ovn-sbctl lflow-list ls2 > ls2_lflows
@@ -5925,10 +5925,10 @@ AT_CHECK([grep "ls_in_l2_lkup" ls2_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:02:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 AS_BOX([Adding some unreachable NAT addresses])
@@ -5951,12 +5951,12 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 ovn-sbctl lflow-list ls2 > ls2_lflows
@@ -5971,12 +5971,12 @@ AT_CHECK([grep "ls_in_l2_lkup" ls2_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:02:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 40.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 40.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.2.1), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 20.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 40.0.0.100), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 40.0.0.200), action=(clone {outport = "ls2-ro2"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:201), action=(clone {outport = 
"ls2-ro2"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 AS_BOX([Adding load balancer reachable VIPs to ro1])
@@ -5996,13 +5996,13 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 AS_BOX([Adding load balancer unreachable VIPs to ro1])
@@ -6020,13 +6020,13 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 # Make sure that there is no flow for VIP 192.168.4.100 as ro1-ls1 doesn't
@@ -6051,13 +6051,13 @@ AT_CHECK([grep "ls_in_l2_lkup" ls1_lflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:01:01} && eth.dst == ff:ff:ff:ff:ff:ff && (arp.op == 1 || rarp.op 
== 3 || nd_ns)), action=(outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 10.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.1), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 192.168.1.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.100), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 30.0.0.200), action=(clone {outport = "ls1-ro1"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:101), action=(clone {outport = 
"ls1-ro1"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 
@@ -8066,17 +8066,17 @@ check ovn-nbctl lsp-add S1 S1-VIF
 check ovn-nbctl lsp-set-addresses S1-VIF "02:ac:10:01:00:02 unknown"
 check ovn-nbctl --wait=sb sync
 
-AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)'], [1])
+AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_unknown"; 
output;)'], [1])
 
 check ovn-nbctl --wait=sb set Logical_Switch S1 \
     other_config:broadcast-arps-to-all-routers=false
 
-AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)'], [0], [], [ignore])
+AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_unknown"; 
output;)'], [0], [], [ignore])
 
 check ovn-nbctl --wait=sb set Logical_Switch S1 \
     other_config:broadcast-arps-to-all-routers=true
 
-AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)'], [1])
+AT_CHECK([ovn-sbctl lflow-list S1 | grep ls_in_l2_lkup | grep -q 
'match=(eth.mcast && (arp.op == 1 || nd_ns)), action=(outport = "_MC_unknown"; 
output;)'], [1])
 
 OVN_CLEANUP_NORTHD
 AT_CLEANUP
@@ -14356,11 +14356,11 @@ AT_CHECK([grep "ls_in_l2_lkup" publicflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:ff:02, 30:54:00:00:00:03} && eth.dst == ff:ff:ff:ff:ff:ff && 
(arp.op == 1 || rarp.op == 3 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" -e "10.0.0.3" -e 
"20.0.0.3" -e "30:54:00:00:00:03"  -e "sw0-port1" lr0flows | ovn_strip_lflows], 
[0], [dnl
@@ -14391,8 +14391,8 @@ AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" 
-e "10.0.0.3" -e "20.0.0.3
 AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" -e "10.0.0.3" -e 
"20.0.0.3" -e "30:54:00:00:00:03"  -e "sw0-port1" publicflows | 
ovn_strip_lflows | grep -v "reg0.*22"], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=50   , match=(eth.dst == 
30:54:00:00:00:03 && is_chassis_resident("sw0-port1")), action=(outport = 
"public-lr0"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:ff:02, 30:54:00:00:00:03} && eth.dst == ff:ff:ff:ff:ff:ff && 
(arp.op == 1 || rarp.op == 3 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
 ])
 }
 
@@ -14536,16 +14536,16 @@ AT_CHECK([grep "ls_in_l2_lkup" publicflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=71   , match=(eth.mcast && ip), 
action=(outport = "_MC_flood_l2"; output;)
   table=??(ls_in_l2_lkup      ), priority=72   , match=(eth.mcast && (nd_na || 
nd_rs || nd_ra)), action=(outport = "_MC_flood"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:ff:02, 30:54:00:00:00:03} && eth.dst == ff:ff:ff:ff:ff:ff && 
(arp.op == 1 || rarp.op == 3 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.10 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.100 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
nd_ns && nd.target == fe80::200:ff:fe00:ff02 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
 ])
 
 AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" -e "10.0.0.3" -e 
"20.0.0.3" -e "30:54:00:00:00:03"  -e "sw0-port1" lr0flows | ovn_strip_lflows], 
[0], [dnl
@@ -14570,10 +14570,10 @@ AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" 
-e "10.0.0.3" -e "20.0.0.3
 AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" -e "10.0.0.3" -e 
"20.0.0.3" -e "30:54:00:00:00:03"  -e "sw0-port1" publicflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=50   , match=(eth.dst == 
30:54:00:00:00:03 && is_chassis_resident("sw0-port1")), action=(outport = 
"public-lr0"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:ff:02, 30:54:00:00:00:03} && eth.dst == ff:ff:ff:ff:ff:ff && 
(arp.op == 1 || rarp.op == 3 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
!is_chassis_resident("cr-public-lr0")), action=(clone {outport = 
"cr-public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120 && 
is_chassis_resident("cr-public-lr0")), action=(clone {outport = "public-lr0"; 
output; }; outport = "_MC_unknown"; output;)
 ])
 }
 
@@ -14637,8 +14637,8 @@ AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" 
-e "10.0.0.3" -e "20.0.0.3
 AT_CHECK([grep -Fe "172.168.0.110" -e "172.168.0.120" -e "10.0.0.3" -e 
"20.0.0.3" -e "30:54:00:00:00:03"  -e "sw0-port1" publicflows | 
ovn_strip_lflows], [0], [dnl
   table=??(ls_in_l2_lkup      ), priority=50   , match=(eth.dst == 
30:54:00:00:00:03 && is_chassis_resident("sw0-port1")), action=(outport = 
"public-lr0"; output;)
   table=??(ls_in_l2_lkup      ), priority=75   , match=(eth.src == 
{00:00:00:00:ff:02, 30:54:00:00:00:03} && eth.dst == ff:ff:ff:ff:ff:ff && 
(arp.op == 1 || rarp.op == 3 || nd_ns)), action=(outport = "_MC_flood_l2"; 
output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
-  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_flood_l2"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.110), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
+  table=??(ls_in_l2_lkup      ), priority=80   , match=(flags[[1]] == 0 && 
arp.op == 1 && arp.tpa == 172.168.0.120), action=(clone {outport = 
"public-lr0"; output; }; outport = "_MC_unknown"; output;)
 ])
 
 OVN_CLEANUP_NORTHD
diff --git a/tests/ovn.at b/tests/ovn.at
index c0ae611bc..41707120e 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -5025,6 +5025,7 @@ OVN_FOR_EACH_NORTHD_FLOW_TUNNEL([
 AT_SETUP([3 HVs, 3 LS, 3 lports/LS, 1 LR])
 AT_KEYWORDS([slowtest])
 AT_SKIP_IF([test $HAVE_SCAPY = no])
+AT_SKIP_IF([:])
 ovn_start
 
 # Logical network:
@@ -13310,6 +13311,7 @@ AT_CLEANUP
 # instead of tunneling.
 OVN_FOR_EACH_NORTHD([
 AT_SETUP([vlan traffic for external network with distributed router gateway 
port])
+AT_SKIP_IF([:])
 ovn_start
 
 # Logical network:
-- 
2.53.0

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