[ovs-dev] [ovn-controller-vtep V5 11/12] ovn-controller-vtep: Extend vtep module to install Ucast_Macs_Remote.
Alex Wang
alexw at nicira.com
Fri Aug 7 07:46:52 UTC 2015
This commit extends the vtep module to support creating the
'Ucast_Macs_Remote' table entries in the vtep database for
MAC addresses on the ovn logical ports.
Signed-off-by: Alex Wang <alexw at nicira.com>
---
V4->V5:
- rebase on top of master.
- rewrite the feature since a lot have changed.
V3->V4:
- add logic to remove Ucast_Macs_Remote for non-existent MACs.
V2->V3:
- rebase to master.
PATCH->V2:
- split into separate commit.
- few optimizations.
---
ovn/controller-vtep/vtep.c | 324 ++++++++++++++++++++++++++++++++++++------
tests/ovn-controller-vtep.at | 136 ++++++++++++++++++
2 files changed, 415 insertions(+), 45 deletions(-)
diff --git a/ovn/controller-vtep/vtep.c b/ovn/controller-vtep/vtep.c
index 55d2e0d..bdbc0bc 100644
--- a/ovn/controller-vtep/vtep.c
+++ b/ovn/controller-vtep/vtep.c
@@ -19,7 +19,8 @@
#include "lib/hash.h"
#include "lib/hmap.h"
-#include "lib/smap.h"
+#include "lib/shash.h"
+#include "lib/sset.h"
#include "lib/util.h"
#include "ovn-controller-vtep.h"
#include "openvswitch/vlog.h"
@@ -34,64 +35,233 @@ VLOG_DEFINE_THIS_MODULE(vtep);
*
*/
+/* Searches the 'chassis_rec->encaps' for the first vtep tunnel
+ * configuration, returns the 'ip'. */
+static const char *
+get_chassis_vtep_ip(const struct sbrec_chassis *chassis_rec)
+{
+ if (chassis_rec) {
+ size_t i;
+
+ for (i = 0; i < chassis_rec->n_encaps; i++) {
+ if (!strcmp(chassis_rec->encaps[i]->type, "vxlan")) {
+ return chassis_rec->encaps[i]->ip;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+/* Creates a new 'Ucast_Macs_Remote'. */
+static struct vteprec_ucast_macs_remote *
+create_umr(struct ovsdb_idl_txn *vtep_idl_txn, const char *mac,
+ const struct vteprec_logical_switch *vtep_ls)
+{
+ struct vteprec_ucast_macs_remote *new_umr;
+
+ new_umr = vteprec_ucast_macs_remote_insert(vtep_idl_txn);
+ vteprec_ucast_macs_remote_set_MAC(new_umr, mac);
+ vteprec_ucast_macs_remote_set_logical_switch(new_umr, vtep_ls);
+
+ return new_umr;
+}
+
+/* Creates a new 'Physical_Locator'. */
+static struct vteprec_physical_locator *
+create_pl(struct ovsdb_idl_txn *vtep_idl_txn, const char *chassis_ip)
+{
+ struct vteprec_physical_locator *new_pl;
+
+ new_pl = vteprec_physical_locator_insert(vtep_idl_txn);
+ vteprec_physical_locator_set_dst_ip(new_pl, chassis_ip);
+ vteprec_physical_locator_set_encapsulation_type(new_pl, VTEP_ENCAP_TYPE);
+
+ return new_pl;
+}
+
+
/* Updates the vtep Logical_Switch table entries' tunnel keys based
* on the port bindings. */
static void
-vtep_lswitch_run(struct controller_vtep_ctx *ctx)
+vtep_lswitch_run(struct shash *vtep_pbs, struct shash *vtep_lswitches)
{
- struct shash vtep_lswitches = SHASH_INITIALIZER(&vtep_lswitches);
- const struct sbrec_port_binding *port_binding_rec;
- const struct vteprec_logical_switch *vtep_ls;
-
- /* Stores all logical switches to 'vtep_lswitches' with name as key. */
- VTEPREC_LOGICAL_SWITCH_FOR_EACH (vtep_ls, ctx->vtep_idl) {
- shash_add(&vtep_lswitches, vtep_ls->name, vtep_ls);
- }
+ struct sset used_ls = SSET_INITIALIZER(&used_ls);
+ struct shash_node *node;
- ovsdb_idl_txn_add_comment(ctx->vtep_idl_txn,
- "ovn-controller-vtep: update logical switch "
- "tunnel keys");
/* Collects the logical switch bindings from port binding entries.
* Since the binding module has already guaranteed that each vtep
* logical switch is bound only to one ovn-sb logical datapath,
* we can just iterate and assign tunnel key to vtep logical switch. */
- SBREC_PORT_BINDING_FOR_EACH(port_binding_rec, ctx->ovnsb_idl) {
- if (!strcmp(port_binding_rec->type, "vtep")
- && port_binding_rec->chassis) {
- const char *lswitch_name = smap_get(&port_binding_rec->options,
- "vtep-logical-switch");
-
- /* If 'port_binding_rec->chassis' exists then 'lswitch_name'
- * must also exist. */
- ovs_assert(lswitch_name);
- vtep_ls = shash_find_and_delete(&vtep_lswitches, lswitch_name);
- if (!vtep_ls) {
- VLOG_ERR("logical port (%s) bound to non-exist vtep logical "
- "switch (%s), something is seriously wrong",
- port_binding_rec->logical_port, lswitch_name);
- } else {
- int64_t tnl_key;
-
- tnl_key = port_binding_rec->datapath->tunnel_key;
- if (vtep_ls->n_tunnel_key
- && vtep_ls->tunnel_key[0] != tnl_key) {
- VLOG_DBG("set vtep logical switch (%s) tunnel key from "
- "(%"PRId64") to (%"PRId64")", vtep_ls->name,
- vtep_ls->tunnel_key[0], tnl_key);
- }
+ SHASH_FOR_EACH (node, vtep_pbs) {
+ const struct sbrec_port_binding *port_binding_rec = node->data;
+ const char *lswitch_name = smap_get(&port_binding_rec->options,
+ "vtep-logical-switch");
+ const struct vteprec_logical_switch *vtep_ls;
+
+ /* 'lswitch_name' must exist. */
+ ovs_assert(lswitch_name);
+ vtep_ls = shash_find_data(vtep_lswitches, lswitch_name);
+ if (!vtep_ls) {
+ /* This could only happen when someone is messing up
+ * using ovn-sbctl command. */
+ VLOG_ERR("logical port (%s) bound to non-exist vtep logical "
+ "switch (%s), something is seriously wrong",
+ port_binding_rec->logical_port, lswitch_name);
+ } else {
+ int64_t tnl_key;
+
+ tnl_key = port_binding_rec->datapath->tunnel_key;
+ if (vtep_ls->n_tunnel_key
+ && vtep_ls->tunnel_key[0] != tnl_key) {
+ VLOG_DBG("set vtep logical switch (%s) tunnel key from "
+ "(%"PRId64") to (%"PRId64")", vtep_ls->name,
+ vtep_ls->tunnel_key[0], tnl_key);
vteprec_logical_switch_set_tunnel_key(vtep_ls, &tnl_key, 1);
}
+ /* sset will ignore duplicates. */
+ sset_add(&used_ls, lswitch_name);
}
}
+ /* Resets the tunnel keys for unused vtep logical switches. */
+ SHASH_FOR_EACH (node, vtep_lswitches) {
+ const struct vteprec_logical_switch *vtep_ls = node->data;
+ if (!sset_find(&used_ls, vtep_ls->name)) {
+ int64_t tnl_key = 0;
+ vteprec_logical_switch_set_tunnel_key(node->data, &tnl_key, 1);
+ }
+ }
+ sset_destroy(&used_ls);
+}
+
+/* Updates the vtep 'Ucast_Macs_Remote' table based on non-vtep port
+ * bindings. */
+static void
+vtep_macs_run(struct ovsdb_idl_txn *vtep_idl_txn, struct shash *ucast_macs_rmts,
+ struct shash *physical_locators, struct shash *vtep_lswitches,
+ struct shash *other_pbs)
+{
struct shash_node *node;
- /* Resets the tunnel keys for the rest of vtep logical switches. */
- SHASH_FOR_EACH (node, &vtep_lswitches) {
- int64_t tnl_key = 0;
+ struct hmap ls_map;
+
+ /* Maps from ovn logical datapath tunnel key (which is also the vtep
+ * logical switch tunnel key) to the corresponding vtep logical switch
+ * instance. Also, the shash map 'added_macs' is used for checking
+ * duplicated MAC addresses in the same ovn logical datapath. */
+ struct ls_hash_node {
+ struct hmap_node hmap_node;
+
+ const struct vteprec_logical_switch *vtep_ls;
+ struct shash added_macs;
+ };
+
+ hmap_init(&ls_map);
+ SHASH_FOR_EACH (node, vtep_lswitches) {
+ struct ls_hash_node *ls_node = xmalloc(sizeof *ls_node);
- vteprec_logical_switch_set_tunnel_key(node->data, &tnl_key, 1);
+ ls_node->vtep_ls = node->data;
+ shash_init(&ls_node->added_macs);
+ hmap_insert(&ls_map, &ls_node->hmap_node,
+ hash_uint64((uint64_t) ls_node->vtep_ls->tunnel_key[0]));
}
- shash_destroy(&vtep_lswitches);
+ SHASH_FOR_EACH (node, other_pbs) {
+ const struct sbrec_port_binding *port_binding_rec = node->data;
+ const struct sbrec_chassis *chassis_rec;
+ struct ls_hash_node *ls_node;
+ const char *chassis_ip;
+ int64_t tnl_key;
+ int i;
+
+ chassis_rec = port_binding_rec->chassis;
+ chassis_ip = get_chassis_vtep_ip(chassis_rec);
+
+ /* Unreachable chassis, continue. */
+ if (!chassis_ip) {
+ continue;
+ }
+
+ tnl_key = port_binding_rec->datapath->tunnel_key;
+ HMAP_FOR_EACH_WITH_HASH (ls_node, hmap_node,
+ hash_uint64((uint64_t) tnl_key),
+ &ls_map) {
+ if (ls_node->vtep_ls->tunnel_key[0] == tnl_key) {
+ break;
+ }
+ }
+ /* If 'ls_node' is NULL, that means no vtep logical switch is
+ * attached to the corresponding ovn logical datapath, so pass. */
+ if (!ls_node) {
+ continue;
+ }
+
+ for (i = 0; i < port_binding_rec->n_mac; i++) {
+ const struct vteprec_ucast_macs_remote *umr;
+ const struct vteprec_physical_locator *pl;
+ const struct sbrec_port_binding *conflict;
+ char *mac = port_binding_rec->mac[i];
+
+ /* xxx Need to address this. */
+ if (!strcmp(mac, "unknown")) {
+ continue;
+ }
+
+ /* Checks for duplicate MAC in the same vtep logical switch. */
+ conflict = shash_find_data(&ls_node->added_macs, mac);
+ if (conflict) {
+ VLOG_WARN("MAC address (%s) has already been known to be "
+ "on logical port (%s) in the same logical "
+ "datapath, so just ignore this logical port (%s)",
+ mac, conflict->logical_port,
+ port_binding_rec->logical_port);
+ continue;
+ }
+ shash_add(&ls_node->added_macs, mac, port_binding_rec);
+
+ char *mac_ip = xasprintf("%s%s", mac, chassis_ip);
+ umr = shash_find_data(ucast_macs_rmts, mac_ip);
+ /* If finds the 'umr' entry for the mac and ip, deletes the
+ * entry from shash so that it is not gargage collected.
+ *
+ * If not found, creates a new 'umr' entry.
+ *
+ * If vtep logical switch does not match, the logical port
+ * owning the MAC may be moved to a new ovn logical datapath.
+ * In that case, just creates a new umr entry for the MAC.
+ * The old one will be garbage collected. */
+ if (umr && umr->logical_switch == ls_node->vtep_ls) {
+ shash_find_and_delete(ucast_macs_rmts, mac_ip);
+ } else {
+ const struct vteprec_ucast_macs_remote *new_umr;
+
+ new_umr = create_umr(vtep_idl_txn, mac, ls_node->vtep_ls);
+ pl = shash_find_data(physical_locators, chassis_ip);
+ if (pl) {
+ vteprec_ucast_macs_remote_set_locator(new_umr, pl);
+ } else {
+ const struct vteprec_physical_locator *new_pl;
+
+ new_pl = create_pl(vtep_idl_txn, chassis_ip);
+ vteprec_ucast_macs_remote_set_locator(new_umr, new_pl);
+ /* Updates the 'physical_locators'. */
+ shash_add(physical_locators, chassis_ip, new_pl);
+ }
+ }
+ free(mac_ip);
+ }
+ }
+
+ /* Removes all remaining 'umr's, since they do not exist anymore. */
+ SHASH_FOR_EACH (node, ucast_macs_rmts) {
+ vteprec_ucast_macs_remote_delete(node->data);
+ }
+ struct ls_hash_node *iter, *next;
+ HMAP_FOR_EACH_SAFE (iter, next, hmap_node, &ls_map) {
+ hmap_remove(&ls_map, &iter->hmap_node);
+ shash_destroy(&iter->added_macs);
+ free(iter);
+ }
+ hmap_destroy(&ls_map);
}
/* Since we do not own any vtep logical switch, just sets their tunnel key
@@ -107,6 +277,19 @@ vtep_lswitch_cleanup(struct ovsdb_idl *vtep_idl)
}
}
+/* Removes all entries in the 'Ucast_Macs_Remote' table in vtep database.
+ * Returns true when all done. */
+static bool
+vtep_macs_cleanup(struct ovsdb_idl *vtep_idl)
+{
+ const struct vteprec_ucast_macs_remote *umr;
+
+ VTEPREC_UCAST_MACS_REMOTE_FOR_EACH (umr, vtep_idl) {
+ vteprec_ucast_macs_remote_delete(umr);
+ return false;
+ }
+ return true;
+}
/* Updates vtep logical switch tunnel keys. */
void
@@ -115,7 +298,59 @@ vtep_run(struct controller_vtep_ctx *ctx)
if (!ctx->vtep_idl_txn) {
return;
}
- vtep_lswitch_run(ctx);
+
+ struct shash vtep_lswitches = SHASH_INITIALIZER(&vtep_lswitches);
+ struct shash ucast_macs_rmts = SHASH_INITIALIZER(&ucast_macs_rmts);
+ struct shash physical_locators = SHASH_INITIALIZER(&physical_locators);
+ struct shash vtep_pbs = SHASH_INITIALIZER(&vtep_pbs);
+ struct shash other_pbs = SHASH_INITIALIZER(&other_pbs);
+ const struct vteprec_logical_switch *vtep_ls;
+ const struct vteprec_ucast_macs_remote *umr;
+ const struct vteprec_physical_locator *pl;
+ const struct sbrec_port_binding *port_binding_rec;
+
+ /* Collects 'Logical_Switch's. */
+ VTEPREC_LOGICAL_SWITCH_FOR_EACH (vtep_ls, ctx->vtep_idl) {
+ shash_add(&vtep_lswitches, vtep_ls->name, vtep_ls);
+ }
+
+ /* Collects 'Ucast_Macs_Remote's. */
+ VTEPREC_UCAST_MACS_REMOTE_FOR_EACH (umr, ctx->vtep_idl) {
+ char *mac_ip =
+ xasprintf("%s%s", umr->MAC,
+ umr->locator ? umr->locator->dst_ip : "");
+
+ shash_add(&ucast_macs_rmts, mac_ip, umr);
+ free(mac_ip);
+ }
+ /* Collects 'Physical_Locator's. */
+ VTEPREC_PHYSICAL_LOCATOR_FOR_EACH (pl, ctx->vtep_idl) {
+ shash_add(&physical_locators, pl->dst_ip, pl);
+ }
+ /* Collects and classifies 'Port_Binding's. */
+ SBREC_PORT_BINDING_FOR_EACH(port_binding_rec, ctx->ovnsb_idl) {
+ struct shash *target =
+ !strcmp(port_binding_rec->type, "vtep") ? &vtep_pbs : &other_pbs;
+
+ if (!port_binding_rec->chassis) {
+ continue;
+ }
+ shash_add(target, port_binding_rec->logical_port, port_binding_rec);
+ }
+
+ ovsdb_idl_txn_add_comment(ctx->vtep_idl_txn,
+ "ovn-controller-vtep: update logical switch "
+ "tunnel keys and 'ucast_macs_remote's");
+
+ vtep_lswitch_run(&vtep_pbs, &vtep_lswitches);
+ vtep_macs_run(ctx->vtep_idl_txn, &ucast_macs_rmts, &physical_locators,
+ &vtep_lswitches, &other_pbs);
+
+ shash_destroy(&vtep_lswitches);
+ shash_destroy(&ucast_macs_rmts);
+ shash_destroy(&physical_locators);
+ shash_destroy(&vtep_pbs);
+ shash_destroy(&other_pbs);
}
/* Cleans up all created vtep related entries. Returns true when all done. */
@@ -129,6 +364,5 @@ vtep_cleanup(struct controller_vtep_ctx *ctx)
ovsdb_idl_txn_add_comment(ctx->vtep_idl_txn,
"cleans up vtep configuration");
vtep_lswitch_cleanup(ctx->vtep_idl);
-
- return true;
+ return vtep_macs_cleanup(ctx->vtep_idl);
}
diff --git a/tests/ovn-controller-vtep.at b/tests/ovn-controller-vtep.at
index ea58636..8d8b7c4 100644
--- a/tests/ovn-controller-vtep.at
+++ b/tests/ovn-controller-vtep.at
@@ -294,3 +294,139 @@ AT_CHECK([vtep-ctl --columns=tunnel_key list Logical_Switch | cut -d ':' -f2 | t
OVN_CONTROLLER_VTEP_STOP
AT_CLEANUP
+
+
+# Tests vtep module 'Ucast_Macs_Remote's.
+AT_SETUP([ovn-controller-vtep - test vtep-macs 1])
+OVN_CONTROLLER_VTEP_START
+
+# creates a simple logical network with the vtep device and a fake hv chassis
+# 'ch0'.
+AT_CHECK([ovn-nbctl lport-add br-test vif0])
+AT_CHECK([ovn-nbctl lport-set-macs vif0 f0:ab:cd:ef:01:02])
+AT_CHECK([ovn-sbctl chassis-add ch0 vxlan 1.2.3.5])
+AT_CHECK([ovn-sbctl lport-bind vif0 ch0])
+
+# creates the logical switch in vtep and adds the corresponding logical
+# port to 'br-test'.
+AT_CHECK([vtep-ctl add-ls lswitch0 -- bind-ls br-vtep p0 100 lswitch0])
+OVN_NB_ADD_VTEP_PORT([br-test], [br-vtep_lswitch0], [br-vtep], [lswitch0])
+OVS_WAIT_UNTIL([test -n "`ovn-sbctl list Port_Binding | grep br-vtep_lswitch0`"])
+
+# adds another lswitch 'br-void' in ovn-nb database.
+AT_CHECK([ovn-nbctl lswitch-add br-void])
+# adds fake hv chassis 'ch1'.
+AT_CHECK([ovn-nbctl lport-add br-void vif1])
+AT_CHECK([ovn-nbctl lport-set-macs vif1 f0:ab:cd:ef:01:02])
+AT_CHECK([ovn-sbctl chassis-add ch1 vxlan 1.2.3.6])
+AT_CHECK([ovn-sbctl lport-bind vif1 ch1])
+OVS_WAIT_UNTIL([test -n "`ovn-sbctl list Port_Binding | grep vif1`"])
+
+# checks Ucast_Macs_Remote creation.
+OVS_WAIT_UNTIL([test -n "`vtep-ctl list Ucast_Macs_Remote | grep _uuid`"])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' '], [0], [dnl
+"f0:ab:cd:ef:01:02"
+])
+
+# checks physical locator creation.
+OVS_WAIT_UNTIL([test -n "`vtep-ctl list Physical_Locator | grep _uuid`"])
+AT_CHECK([vtep-ctl --columns=dst_ip list Physical_Locator | cut -d ':' -f2 | tr -d ' ' | grep -v 1.2.3.4 | sed '/^$/d'], [0], [dnl
+"1.2.3.5"
+])
+
+# checks tunnel creation by ovs-vtep.
+OVS_WAIT_UNTIL([test -n "`ovs-vsctl list Interface bfd1.2.3.5`"])
+AT_CHECK([ovs-vsctl --columns=options list Interface bfd1.2.3.5 | cut -d ':' -f2 | tr -d ' '], [0], [dnl
+{remote_ip="1.2.3.5"}
+])
+
+# adds another mac to lport.
+AT_CHECK([ovn-nbctl lport-set-macs vif0 f0:ab:cd:ef:01:02 f0:ab:cd:ef:01:03])
+OVS_WAIT_UNTIL([test -n "`vtep-ctl list Ucast_Macs_Remote | grep 03`"])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' ' | sort], [0], [dnl
+
+"f0:ab:cd:ef:01:02"
+"f0:ab:cd:ef:01:03"
+])
+
+# removes one mac to lport.
+AT_CHECK([ovn-nbctl lport-set-macs vif0 f0:ab:cd:ef:01:03])
+OVS_WAIT_UNTIL([test -z "`vtep-ctl --columns=MAC list Ucast_Macs_Remote | grep 02`"])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' ' | sort], [0], [dnl
+"f0:ab:cd:ef:01:03"
+])
+
+# migrates mac to lport vif1 on 'br-void'.
+AT_CHECK([ovn-nbctl lport-set-macs vif0])
+AT_CHECK([ovn-nbctl lport-set-macs vif1 f0:ab:cd:ef:01:03])
+OVS_WAIT_UNTIL([test -z "`vtep-ctl --columns=MAC list Ucast_Macs_Remote | grep 03`"])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' ' | sort], [0], [dnl
+])
+
+OVN_CONTROLLER_VTEP_STOP
+AT_CLEANUP
+
+
+# Tests vtep module 'Ucast_Macs_Remote's (corner cases).
+AT_SETUP([ovn-controller-vtep - test vtep-macs 2])
+OVN_CONTROLLER_VTEP_START
+
+# creates a simple logical network with the vtep device and a fake hv chassis
+# 'ch0'.
+AT_CHECK([ovn-nbctl lport-add br-test vif0])
+AT_CHECK([ovn-nbctl lport-set-macs vif0 f0:ab:cd:ef:01:02])
+AT_CHECK([ovn-sbctl chassis-add ch0 vxlan 1.2.3.5])
+AT_CHECK([ovn-sbctl lport-bind vif0 ch0])
+
+# creates another vif in the same logical switch with duplicate mac.
+AT_CHECK([ovn-nbctl lport-add br-test vif1])
+AT_CHECK([ovn-nbctl lport-set-macs vif1 f0:ab:cd:ef:01:02])
+AT_CHECK([ovn-sbctl lport-bind vif1 ch0])
+
+# creates the logical switch in vtep and adds the corresponding logical
+# port to 'br-test'.
+AT_CHECK([vtep-ctl add-ls lswitch0 -- bind-ls br-vtep p0 100 lswitch0])
+OVN_NB_ADD_VTEP_PORT([br-test], [br-vtep_lswitch0], [br-vtep], [lswitch0])
+OVS_WAIT_UNTIL([test -n "`ovn-sbctl list Port_Binding | grep br-vtep_lswitch0`"])
+
+# checks Ucast_Macs_Remote creation. Should still only be one entry, since duplicate
+# mac in the same logical switch is not allowed.
+OVS_WAIT_UNTIL([test -n "`vtep-ctl list Ucast_Macs_Remote | grep _uuid`"])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' '], [0], [dnl
+"f0:ab:cd:ef:01:02"
+])
+# confirms the warning log.
+OVS_WAIT_UNTIL([test -n "`grep WARN ovn-controller-vtep.log`"])
+AT_CHECK([sed -n 's/^.*\(|WARN|.*\)$/\1/p' ovn-controller-vtep.log | sed 's/([[-_:0-9a-z]][[-_:0-9a-z]]*)/()/g' | uniq], [0], [dnl
+|WARN|MAC address () has already been known to be on logical port () in the same logical datapath, so just ignore this logical port ()
+])
+
+# deletes vif1.
+AT_CHECK([ovn-nbctl lport-del vif1])
+
+# adds another lswitch 'br-void' in ovn-nb database.
+AT_CHECK([ovn-nbctl lswitch-add br-void])
+# adds fake hv chassis 'ch1' and vif1 with same mac address as vif0.
+AT_CHECK([ovn-nbctl lport-add br-void vif1])
+AT_CHECK([ovn-nbctl lport-set-macs vif1 f0:ab:cd:ef:01:02])
+AT_CHECK([ovn-sbctl chassis-add ch1 vxlan 1.2.3.6])
+AT_CHECK([ovn-sbctl lport-bind vif1 ch1])
+OVS_WAIT_UNTIL([test -n "`ovn-sbctl list Port_Binding | grep vif1`"])
+
+# creates another logical switch in vtep and adds the corresponding logical
+# port to 'br-void'.
+AT_CHECK([vtep-ctl add-ls lswitch1 -- bind-ls br-vtep p0 200 lswitch1])
+OVN_NB_ADD_VTEP_PORT([br-void], [br-void_lswitch1], [br-vtep], [lswitch1])
+OVS_WAIT_UNTIL([test -n "`ovn-sbctl list Port_Binding | grep br-void_lswitch1`"])
+
+# checks Ucast_Macs_Remote creation. Should see two entries since it is allowed
+# to have duplicate macs in different logical switches.
+OVS_WAIT_UNTIL([test `vtep-ctl --columns=MAC list Ucast_Macs_Remote | grep 02 | wc -l` -gt 1])
+AT_CHECK([vtep-ctl --columns=MAC list Ucast_Macs_Remote | cut -d ':' -f2- | tr -d ' ' | sort], [0], [dnl
+
+"f0:ab:cd:ef:01:02"
+"f0:ab:cd:ef:01:02"
+])
+
+OVN_CONTROLLER_VTEP_STOP(["/has already been known to be on logical port/d"])
+AT_CLEANUP
--
1.7.9.5
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