+static void
+do_tun_cookie(int argc OVS_UNUSED, char *argv[])
+{
+ struct nxt_tun_id_cookie *tun_id_cookie;
+ struct ofpbuf *buffer;
+ struct vconn *vconn;
+
+ tun_id_cookie = make_openflow(sizeof *tun_id_cookie, OFPT_VENDOR, &buffer);
+
+ tun_id_cookie->vendor = htonl(NX_VENDOR_ID);
+ tun_id_cookie->subtype = htonl(NXT_TUN_ID_FROM_COOKIE);
+ tun_id_cookie->set = !strcmp(argv[2], "true");
+
+ open_vconn(argv[1], &vconn);
+ send_openflow_buffer(vconn, buffer);
+ vconn_close(vconn);
+}
+