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speed-duplex
This command configures the speed and duplex mode of a given interface when
autonegotiation is disabled. Use the
no
form to restore the default.
Syntax
speed-duplex {10000full | 1000full | 100full | 100half | 10full | 10half}
no speed-duplex
• 10000full - Forces 10 Gbps full-duplex operation
• 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
• Auto-negotiation is enabled by default.
• When auto-negotiation is disabled, the default speed-duplex setting is:
- Gigabit Ethernet ports – 1000full (1 Gbps full-duplex)
- 10 Gigabit Ethernet ports – 10000full (10 Gbps full-duplex)
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• The 1000BASE-T and 10GBASE-T standards do not support forced mode.
Auto-negotiation should always be used to establish a connection over any
1000BASE-T or 10GBASE-T port or trunk. If not used, the success of the link
process cannot be guaranteed when connecting to other types of switches.
• 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.
• 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)#
Related Commands
negotiation (27-4)
capabilities (27-4)
27-3
speed-duplex
27