def _build_group_buckets(vlan, unicast_flood): buckets = [] tagged_flood_ports = vlan.tagged_flood_ports(unicast_flood) buckets.extend(valve_of.group_flood_buckets(tagged_flood_ports, False)) untagged_flood_ports = vlan.untagged_flood_ports(unicast_flood) buckets.extend(valve_of.group_flood_buckets(untagged_flood_ports, True)) return buckets