rate_limit = c->controller_rate_limit ? *c->controller_rate_limit : 0;
burst_limit = c->controller_burst_limit ? *c->controller_burst_limit : 0;
ofproto_set_rate_limit(br->ofproto, rate_limit, burst_limit);
rate_limit = c->controller_rate_limit ? *c->controller_rate_limit : 0;
burst_limit = c->controller_burst_limit ? *c->controller_burst_limit : 0;
ofproto_set_rate_limit(br->ofproto, rate_limit, burst_limit);