Interface Commands
4-127
4
Default Setting
• Auto-negotiation is enabled by default.
• When auto-negotiation is disabled, the default speed-duplex setting is:
- Fast Ethernet port – 100full (100 Mbps full-duplex)
- 10 Gigabit Ethernet ports – 10000full (10 Gbps full-duplex)
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• 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 9 to 100 Mbps, full-duplex operation.
Related Commands
negotiation (4-127)
capabilities (4-128)
negotiation
This command enables autonegotiation for a given interface
30
. Use the no form to
disable autonegotiation.
Syntax
[no] negotiation
Default Setting
• Disabled for Ports 1-8
• Enabled for Port 9
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• When auto-negotiation is enabled the switch will negotiate the best settings
for a link based on the capabilities command. When auto-negotiation is
Console(config)#interface ethernet 1/9
Console(config-if)#speed-duplex 100full
Console(config-if)#no negotiation
Console(config-if)#
30. The settings for this parameter cannot be changed.
