def convert_mac_colon_to_dot_format(mac_addr):
    """
    Convert mac address in colon format to dot format
    For e.g convert aa:bb:cc:dd:ee:ff to aabb.ccdd.eeff

    Args(str):
        mac address in colon format

    Returns(str):
        mac address in dot format

    """
    mac = mac_addr.split(":")
    mac_addr_dot = "".join(mac[0:2]) + "." + "".join(mac[2:4]) + "." + "".join(mac[4:6])
    return mac_addr_dot