'Return a list of IDs of ports that need to be disconnected.'

def get_unmap_targets_list(self, target_list, mapped_list):

    unmap_list = []
    for mapping_info in mapped_list:
        if ((mapping_info[:utils.PORT_ID_LENGTH], mapping_info.split('-')[2]) in target_list):
            unmap_list.append(mapping_info)
    return unmap_list
