bif_config_bpdu
bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG;
bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root;
bif->bif_config_bpdu.cu_root_path_cost = sc->sc_designated_cost +
bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id;
bif->bif_config_bpdu.cu_port_id = bif->bif_port_id;
bif->bif_config_bpdu.cu_message_age = 0;
bif->bif_config_bpdu.cu_message_age =
bif->bif_config_bpdu.cu_message_age = BSTP_MESSAGE_AGE_INCR;
bif->bif_config_bpdu.cu_max_age = sc->sc_max_age;
bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time;
bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay;
bif->bif_config_bpdu.cu_topology_change_acknowledgment
bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change;
if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age ||
bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu);