speed-duplex
This command configures the speed and duplex mode of a given inte rface 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 op eration
1000full - Forces 1 Gbps full-duplex operation
100full - Forces 100 Mbps full-duplex ope ration
100half - Forces 100 Mbps half-duplex op eratio n
10full - Forces 10 Mbps full-duplex operation
10half - Forces 10 Mbps half-duplex ope ration
Default Setting
Auto-negotiation is enabled by default.
When auto-negotiation is disabled , the defau lt speed-du plex settin g is:
- Gigabit Ethernet ports 1000full (1 Gbps full-duplex)
- 10 Gigabit Ethernet ports – 10 000full (10 Gbps full-duplex)
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
The 1000BASE-T and 10GBASE-T stan dards do not su pport for ced 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 oth er types of switch es.
• To force operation to the speed and duplex mod e 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-ne gotiation , the
optimal settings will be determined by the
capabilities
command. To set the
speed/duplex mode under auto-negotiation, the required mo de mu st be
specified in the capabilities list for an interface.
Example
The following example configures port 5 to 100 Mbps, half-d uplex ope ra tion .
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)
27-3speed-duplex
27