C
HAPTER
27
| Interface Commands
Interface Configuration
– 983 –
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 1000 Mbps 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.
â—† When auto-negotiation is disabled, the default speed-duplex setting is:
â–
Fast Ethernet ports – 100full for 100BASE-TX ports
â–
Gigabit Ethernet ports – 100full for 1000BASE-T ports
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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