negotiation autoEnable auto-negotiation on an interface.C-Series, E-Series, S-Series, Z-Series, S4810Syntax negotiation autoTo disable auto-negotiation, use the no negotiation auto command.Defaults Enabled.Command Modes INTERFACECommand History Version 8.3.11.1 Introduced on the Z9000.Version 8.3.7.0 Introduced on the S4810.Version 8.1.1.0 Introduced on the E-Series ExaScale.Version 7.6.1.0 Introduced on the S-Series.Version 7.5.1.0 Introduced on the C-Series.pre-Version6.2.1.0Introduced on the E-Series.UsageInformationThis command is supported on C-Series, S-Series, and E-Series (TeraScale and ExaScale)10/100/1000 Base-T Ethernet interfaces.The no negotiation auto command is only available if you first manually set the speedof a port to 10Mbits or 100Mbits.The negotiation auto command provides a mode option for configuring an individualport to forced-master/forced slave after you enable auto-negotiation.NOTE: The mode option is not available on non-10/100/1000 Base-T Ethernet line cards.If you do not use the mode option, the default setting is slave. If you do not configure forced-master or forced-slave on a port, the port negotiates to either a master or a slave state. Portstatus is one of the following:• Forced-master• Force-slave• Master• Slave• Auto-neg Error—typically indicates that both ends of the node are configured withforced-master or forced-slave.CAUTION: Ensure that one end of your node is configured as forced-master and one isconfigured as forced-slave. If both are configured the same (that is, forced-master orforced-slave), the show interfaces command flaps between an auto-neg-error andforced-master/slave states.You can display master/slave settings with the show interfaces command.715
