diff --git a/devstack/lib/tacker b/devstack/lib/tacker
index 9fe57da97..60c769f76 100644
--- a/devstack/lib/tacker
+++ b/devstack/lib/tacker
@@ -388,6 +388,7 @@ function tacker_create_initial_network {
 
     echo "Assign ip address to BR_MGMT"
     sudo ip link set ${BR_MGMT} up
+    sudo ip -4 address flush dev ${BR_MGMT}
     sudo ip address add ${NETWORK_GATEWAY_MGMT_IP} dev ${BR_MGMT}
 }