C
HAPTER
30
| Interface Commands
– 776 –
speed-duplex This command configures the speed and duplex mode of a given interface
when auto-negotiation is disabled. Use the no form to restore the default.
SYNTAX
speed-duplex {1000full | 100full | 100half | 10full | 10half}
no speed-duplex
1000full - Forces 1 Gbps full-duplex operation
100full - Forces 100 Mbps full-duplex operation
100half - Forces 100 Mbps half-duplex operation
10full - Forces 10 Mbps full-duplex operation
10half - Forces 10 Mbps half-duplex operation
DEFAULT SETTING
â—† Auto-negotiation is enabled by default on the Gigabit ports.
â—† When auto-negotiation is disabled on the Gigabit ports, the default
speed-duplex setting is 100full.
â—† The speed-duplex setting on the 10 Gigabit ports is fixed at 10Gfull
regardless of the setting for auto-negotiation.
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† The 1000BASE-T standard does not support forced mode. Auto-
negotiation should always be used to establish a connection over any
1000BASE-T port or trunk. If not used, the success of the link process
cannot be guaranteed when connecting to other types of switches.
â—† To force operation to the speed and duplex mode specified in a speed-
duplex command, use the no negotiation command to disable auto-
negotiation on the selected interface.
â—† When using the negotiation command to enable auto-negotiation, the
optimal settings will be determined by the capabilities command. To set
the speed/duplex mode under auto-negotiation, the required mode
must be specified in the capabilities list for an interface.
EXAMPLE
The following example configures port 5 to 100 Mbps, half-duplex
operation.
Console(config)#interface ethernet 1/5
Console(config-if)#speed-duplex 100half
Console(config-if)#no negotiation
Console(config-if)#
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