def mac_addr_convert(mac_address=u""):
    """
    Function for providing single format for MAC addresses.

    :param str mac_address: MAC address to be converted.
    :return: MAC address in format `XX:XX:XX:XX:XX:XX`.
    """
    try:
        mac = mac_address.replace(".", "")
        mac = [mac[i:i + 2].upper() for i in range(0, len(mac), 2)]
        mac = ":".join(mac)
        return mac
    except Exception as e:
        return mac_address