bif_topology_change_acknowledge
bif->bif_topology_change_acknowledge = 0;
bif->bif_topology_change_acknowledge = 0;
= bif->bif_topology_change_acknowledge;
bif->bif_topology_change_acknowledge = 0;
bif->bif_topology_change_acknowledge = 0;
bif->bif_topology_change_acknowledge = 0;
bif->bif_topology_change_acknowledge = 1;