Chapter 10
| Interface Commands
Interface Configuration
– 351 –
Command Usage
This command allows you to disable a port due to abnormal behavior
(e.g., excessive collisions), and then re-enable it after the problem has been
resolved. You may also want to disable a port for security reasons.
Example
The following example disables port 5.
Console(config)#interface ethernet 1/5
Console(config-if)#shutdown
Console(config-if)#
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 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.
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