def _is_ethernet(port_data):
    """Return whether ifIndex port_data belongs to an Ethernet port.

    Args:
        port_data: Data dict related to the port

    Returns:
        valid: True if valid ethernet port

    """
    # Initialize key variables
    valid = False

    # Process ifType
    if 'ifType' in port_data:
        # Get port name
        name = port_data['ifName'].lower()

        # Process ethernet ports
        if port_data['ifType'] == 6:
            # VLAN L2 VLAN interfaces passing as Ethernet
            if name.startswith('vl') is False:
                valid = True

    # Return
    return valid