diff --git a/vmware_nsx/services/lbaas/nsx_v3/implementation/lb_utils.py b/vmware_nsx/services/lbaas/nsx_v3/implementation/lb_utils.py
index 92736d5a30..a4ee48cf01 100644
--- a/vmware_nsx/services/lbaas/nsx_v3/implementation/lb_utils.py
+++ b/vmware_nsx/services/lbaas/nsx_v3/implementation/lb_utils.py
@@ -87,6 +87,39 @@ def validate_lb_subnet(context, plugin, subnet_id):
         return False
 
 
+def validate_lb_member_subnet(context, plugin, subnet_id, lb):
+    '''Validate LB member subnet before creating a member.
+
+    The member subnet should belong to an external network or be connected
+    to the same T1 router as the Lb vip.
+    It will throw exception if the subnet doesn't meet this requirement.
+
+    :param context: context
+    :param plugin: core plugin
+    :param subnet_id: loadbalancer's subnet id
+    :return: True if subnet meet requirement, otherwise return False
+    '''
+    network = get_network_from_subnet(context, plugin, subnet_id)
+    if network.get('router:external'):
+        return True
+    member_router_id = get_router_from_network(
+        context, plugin, subnet_id)
+    lb_router_id = get_router_from_network(
+        context, plugin, lb['vip_subnet_id'])
+    if lb_router_id:
+        # Lb on non-external network. member must be on the same router
+        if lb_router_id == member_router_id:
+            return True
+        else:
+            return False
+    else:
+        # LB on external network. member subnet must have a router
+        if member_router_id:
+            return True
+        else:
+            return False
+
+
 def get_rule_match_conditions(policy):
     match_conditions = []
     # values in rule have already been validated in LBaaS API,
diff --git a/vmware_nsx/services/lbaas/nsx_v3/implementation/member_mgr.py b/vmware_nsx/services/lbaas/nsx_v3/implementation/member_mgr.py
index 63c6cbec37..f571c4ba8e 100644
--- a/vmware_nsx/services/lbaas/nsx_v3/implementation/member_mgr.py
+++ b/vmware_nsx/services/lbaas/nsx_v3/implementation/member_mgr.py
@@ -112,11 +112,13 @@ class EdgeMemberManagerFromDict(base_mgr.Nsxv3LoadbalancerBaseManager):
         lb_id = member['pool']['loadbalancer_id']
         pool_id = member['pool']['id']
         loadbalancer = member['pool']['loadbalancer']
-        if not lb_utils.validate_lb_subnet(context, self.core_plugin,
-                                           member['subnet_id']):
+        if not lb_utils.validate_lb_member_subnet(context, self.core_plugin,
+                                                  member['subnet_id'],
+                                                  loadbalancer):
             completor(success=False)
             msg = (_('Cannot add member %(member)s to pool as member subnet '
-                     '%(subnet)s is neither public nor connected to router') %
+                     '%(subnet)s is neither public nor connected to the LB '
+                     'router') %
                    {'member': member['id'], 'subnet': member['subnet_id']})
             raise n_exc.BadRequest(resource='lbaas-subnet', msg=msg)
 
diff --git a/vmware_nsx/tests/unit/services/lbaas/test_nsxv3_driver.py b/vmware_nsx/tests/unit/services/lbaas/test_nsxv3_driver.py
index 37f798642f..6083c6e116 100644
--- a/vmware_nsx/tests/unit/services/lbaas/test_nsxv3_driver.py
+++ b/vmware_nsx/tests/unit/services/lbaas/test_nsxv3_driver.py
@@ -488,7 +488,7 @@ class TestEdgeLbaasV2Member(BaseTestEdgeLbaasV2):
         return 'member'
 
     def test_create(self):
-        with mock.patch.object(lb_utils, 'validate_lb_subnet'
+        with mock.patch.object(lb_utils, 'validate_lb_member_subnet'
                                ) as mock_validate_lb_subnet, \
             mock.patch.object(self.lbv2_driver.plugin, 'get_pool_members'
                               ) as mock_get_pool_members, \
@@ -538,7 +538,7 @@ class TestEdgeLbaasV2Member(BaseTestEdgeLbaasV2):
                                                           delete=False)
 
     def test_create_lbs_no_router_gateway(self):
-        with mock.patch.object(lb_utils, 'validate_lb_subnet'
+        with mock.patch.object(lb_utils, 'validate_lb_member_subnet'
                                ) as mock_validate_lb_subnet, \
             mock.patch.object(self.lbv2_driver.plugin, 'get_pool_members'
                               ) as mock_get_pool_members, \
@@ -571,6 +571,22 @@ class TestEdgeLbaasV2Member(BaseTestEdgeLbaasV2):
                               self.context,
                               self.member)
 
+    def test_create_member_different_router(self):
+        with mock.patch.object(self.lbv2_driver.plugin, 'get_pool_members'
+                               ) as mock_get_pool_members, \
+            mock.patch.object(lb_utils, 'get_network_from_subnet'
+                              ) as mock_get_network, \
+            mock.patch.object(lb_utils, 'get_router_from_network'
+                              ) as mock_get_router:
+            mock_get_pool_members.return_value = [self.member]
+            mock_get_network.return_value = LB_NETWORK
+            mock_get_router.return_value = None
+
+            self.assertRaises(n_exc.BadRequest,
+                              self.edge_driver.member.create,
+                              self.context,
+                              self.member)
+
     def test_update(self):
         new_member = lb_models.Member(MEMBER_ID, LB_TENANT_ID, POOL_ID,
                                       MEMBER_ADDRESS, 80, 2, pool=self.pool,