Turning off Autonegotiation on a Gigabit Ethernet Port

In certain interoperability situations, you need to turn autonegotiation off on a fiber gigabit Ethernet port. Although a gigabit Ethernet port runs only at full duplex, you must specify the duplex setting. The 10 Gbps ports do not autonegotiate; they always run at full duplex and 10 Gbps speed.