diff --git a/neutron_tempest_plugin/scenario/base.py b/neutron_tempest_plugin/scenario/base.py
index 78b766b..949a1a2 100644
--- a/neutron_tempest_plugin/scenario/base.py
+++ b/neutron_tempest_plugin/scenario/base.py
@@ -258,10 +258,12 @@
                                                'server']['id'])['ports'][0]
         self.fip = self.create_floatingip(port=self.port)
 
-    def check_connectivity(self, host, ssh_user, ssh_key,
-                           servers=None, ssh_timeout=None):
-        ssh_client = ssh.Client(host, ssh_user,
-                                pkey=ssh_key, timeout=ssh_timeout)
+    def check_connectivity(self, host, ssh_user=None, ssh_key=None,
+                           servers=None, ssh_timeout=None, ssh_client=None):
+        # Either ssh_client or ssh_user+ssh_key is mandatory.
+        if ssh_client is None:
+            ssh_client = ssh.Client(host, ssh_user,
+                                    pkey=ssh_key, timeout=ssh_timeout)
         try:
             ssh_client.test_connection_auth()
         except lib_exc.SSHTimeout as ssh_e:
diff --git a/neutron_tempest_plugin/scenario/test_trunk.py b/neutron_tempest_plugin/scenario/test_trunk.py
index 585af06..e4e6ca4 100644
--- a/neutron_tempest_plugin/scenario/test_trunk.py
+++ b/neutron_tempest_plugin/scenario/test_trunk.py
@@ -267,6 +267,9 @@
             use_advanced_image=use_advanced_image)
 
         for vm in [vm1, vm2]:
+            self.check_connectivity(
+                host=vm.floating_ip['floating_ip_address'],
+                ssh_client=vm.ssh_client)
             self._configure_vlan_subport(vm=vm,
                                          vlan_tag=vlan_tag,
                                          vlan_subnet=vlan_subnet)