Reference Guide

434 | Interfaces
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negotiation auto
s z
Enable auto-negotiation on an interface.
Syntax
negotiation auto
To disable auto-negotiation, enter no negotiation auto.
Defaults
Enabled.
Command Modes
INTERFACE
Command History
Usage Information
This command is available on S-Series 10/100/1000 Base-T Ethernet interfaces/
The
no negotiation auto command is only available if you first manually set the speed of a port to
10Mbits or 100Mbits.
The negotiation auto command provides a mode option for configuring an individual port to
forced-master/forced slave once auto-negotiation is enabled
Figure 20-18. negotiation auto Master/Slave Example
FTOS(conf)# int gi 0/0
FTOS(conf-if)#neg auto
FTOS(conf-if-autoneg)# ?
end Exit from configuration mode
exit Exit from autoneg configuration mode
mode Specify autoneg mode
no Negate a command or set its defaults
show Show autoneg configuration information
FTOS(conf-if-autoneg)#mode ?
forced-master Force port to master mode
forced-slave Force port to slave mode
FTOS(conf-if-autoneg)#
If the mode option is not used, 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. Port status is one of the
following:
• Forced-master
• Force-slave
• Master
• Slave
• Auto-neg Error—typically indicates that both ends of the node are configured with forced-master
or forced-slave.
Version 8.3.11.1 Introduced on Z9000
Version
8.3.7.0
Introduced on the S4810.
Note: The mode option is not available on non-10/100/1000 Base-T Ethernet stack-units.
Caution: Ensure that one end of your node is configured as forced-master and one is
configured as forced-slave. If both are configured the same (that is forced-master or
forced-slave), the show interfaces command will flap between an auto-neg-error and
forced-master/slave states.