AdvertisedDuplex
auto(0). If auto-negotiation is enabled (see ethDot3AutoNegotiation), then advertise all duplex that the device supports. If auto-negotiation is disabled, then use full duplex. fullDuplex(1). Advertise that the interface supports full duplex. halfDuplex(2). Advertise that the interface supports half duplex. If auto-negotiation is disabled, then use maximum duplex set.