AT_CHECK([ovs-ofctl add-flow br0 in_port=1,cookie=3,actions=drop])
AT_CHECK([ovs-ofctl mod-flows br0 in_port=2,cookie=2,actions=output:2])
AT_CHECK([ovs-ofctl del-flows br0 cookie=1/-1])
AT_CHECK([ovs-ofctl add-flow br0 in_port=1,cookie=3,actions=drop])
AT_CHECK([ovs-ofctl mod-flows br0 in_port=2,cookie=2,actions=output:2])
AT_CHECK([ovs-ofctl del-flows br0 cookie=1/-1])