This object specified the advertised modes for the SAP
negotiation on this interface. Modes are executed in
the order as specified in the mode list.
Mode which is at the beginning of the mode list will be
executed first. Mode which is at the end of mode list
will be executed last.
Value of this object will becomes zero length octet if
SAP negotiation is disabled.
This object is not allowed to be set to a zero length
string.