Set to enabled(1) to operate in full duplex mode: port will allow simultaneous transmit and receive which can double its bandwidth. Set to disabled(2) to operate in normal mode. Set to auto-negotiate(3) to allow the switch to negotiate with the other end of the connection. Auto-negotiate(3) may not be set on a 10Mbps port, or a port whose connector type is not rj45. Doing so will result in badValue. Set to enabled_flow_control(4) to allow a port to operate in full duplex and to allow a port to throttle packet transmission according to flow control messages sent by the other end of the link.