test_vlan.py fix

Author: vmittal-msft

tests/test_vlan.py

@@ -7,6 +7,7 @@
 @pytest.mark.usefixtures("testlog")
 @pytest.mark.usefixtures('dvs_vlan_manager')
 @pytest.mark.usefixtures('dvs_lag_manager')
+
 class TestVlan(object):
 
     def check_syslog(self, dvs, marker, process, err_log, vlan_str, expected_cnt):
@@ -505,6 +506,7 @@ def test_VlanMemberLinkDown(self, dvs):
         server_ip = "192.168.0.100"
         vlan_intf_sysctl_param_path = "/proc/sys/net/ipv4/conf/%s/arp_evict_nocarrier" % vlan_interface
 
+        dvs.runcmd("ip neigh flush all")
         self.dvs_vlan.create_vlan(vlan)
         vlan_oid = self.dvs_vlan.get_and_verify_vlan_ids(1)[0]
         self.dvs_vlan.verify_vlan(vlan_oid, vlan)