Chapter 10
| Interface Commands
Interface Configuration
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◆ 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
◆ 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. However, this switch does provide a
means of safely forcing a link to operate at 1000 Mbps, full-duplex using the
giga-phy-mode command.
◆ 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 (299)
capabilities (295)
clear counters This command clears statistics on an interface.
Syntax
clear counters interface
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-28/52)
port-channel channel-id (Range: 1-12)
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