diff --git a/vmware_nsxlib/tests/unit/v3/test_constants.py b/vmware_nsxlib/tests/unit/v3/test_constants.py
index 337d89d1..049a112c 100644
--- a/vmware_nsxlib/tests/unit/v3/test_constants.py
+++ b/vmware_nsxlib/tests/unit/v3/test_constants.py
@@ -579,6 +579,7 @@ FAKE_TIERO_ROUTER = {
         "target_id": "c3d80576-e340-403d-a2d0-f4a72a1db6e3"
     }],
     "advanced_config": {
+        "transport_zone_id": FAKE_TZ_UUID,
         "external_transit_networks": ["100.64.0.0/16"],
         "internal_transit_network": "169.254.0.0/28"
     },
diff --git a/vmware_nsxlib/tests/unit/v3/test_router.py b/vmware_nsxlib/tests/unit/v3/test_router.py
index 2fbd8372..238e6784 100644
--- a/vmware_nsxlib/tests/unit/v3/test_router.py
+++ b/vmware_nsxlib/tests/unit/v3/test_router.py
@@ -161,6 +161,13 @@ class TestRouter(nsxlib_testcase.NsxClientTestCase):
             tz = self.nsxlib.router.get_tier0_router_overlay_tz(tier0_uuid)
             self.assertEqual(tz, test_constants.FAKE_TZ_UUID)
 
+    def test_get_tier0_router_overlay_tz_via_advanced_config(self):
+        tier0_uuid = uuidutils.generate_uuid()
+        with mock.patch.object(self.nsxlib.router._router_client, 'get',
+                               return_value=test_constants.FAKE_TIERO_ROUTER):
+            tz = self.nsxlib.router.get_tier0_router_overlay_tz(tier0_uuid)
+            self.assertEqual(tz, test_constants.FAKE_TZ_UUID)
+
     def test_get_connected_t0_transit_net(self):
         t1_uuid = uuidutils.generate_uuid()
         transit_net = '1.1.1.0'
diff --git a/vmware_nsxlib/v3/router.py b/vmware_nsxlib/v3/router.py
index 08a12c8a..a5fc7b2e 100644
--- a/vmware_nsxlib/v3/router.py
+++ b/vmware_nsxlib/v3/router.py
@@ -293,6 +293,10 @@ class RouterLib(object):
         return tier0_tzs
 
     def get_tier0_router_overlay_tz(self, tier0_uuid):
+        lrouter = self._router_client.get(tier0_uuid)
+        tz_uuid = lrouter.get('advanced_config', {}).get('transport_zone_id')
+        if tz_uuid:
+            return tz_uuid
         tz_uuids = self.get_tier0_router_tz(tier0_uuid)
         for tz_uuid in tz_uuids:
             # look for the overlay tz