140 BigIron RX Series Configuration Guide53-1001986-01Speed/Duplex negotiation6Speed/Duplex negotiationSpeed/Duplex Negotiation detects the speed (10MBps, 100Mbps, 1000Mbps) and duplex(half-duplex or full-duplex) settings of the device on the other end of the wire and subsequentlyadjusts to match those settings.Each of the 10/100/1000BaseTX ports is designed to auto-sense and auto-negotiate the speedand mode of the connected device. If the attached device does not support this operation, you canmanually enter the port speed.You can configure a port to accept either full-duplex (bi-directional) or half-duplex (uni-directional)traffic. Port duplex mode and port speed are modified by the same command.The master and slave parameters are applicable only if the speed parameter is set to 1000. Thevalue for this parameter must correspond to the value on the link partner--for example, if the locallink has a value of master, the link partner must have a value of slave.On 1000 Gigabit, auto-negotiation determines which side of the link is master and which side isslave.NOTEYou can not force a full duplex speed on CuSFP when using two 24C’s. Setting both sides to 100-fulland using gig links or actual 24C’s is recommended for switch uplinks. Host PC’s that are connectedare not affected.NOTEModifying the port speed of a port that has a pre-configured rate limit policy may result in theinability to remove the port's rate limit policy.NOTEBrocade recommends using gig links or 24C’s links for switch uplinks when transmitting Layer 2Traffic in a bidirectional patterns.NOTETo force the port to run at 1000 Mbps, set one of the link’s ports to be the master for the link. To seta port as a Gigabit master port, enter the following command at the interface configuration level forthe port:NOTEModifying the port speed of a port that has a pre-configured rate limit policy may result in theinability to remove the port's rate limit policy.The following example configures the interface to 1000 Mbps, and designates it as the masterport.To force the port to run at 1000 Mbps, set one of the link’s ports to be the master for the link. Toset a port as a Gigabit master port, enter the following command at the interface configurationlevel for the port.BigIron RX(config)#interface ethernet 1/5BigIron RX(config-if-e10000-1/5)#speed-duplex 1000-masterThe following example configures the interface to 1000 Mbps, and designates it as the slave port.
