Interface Commands 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.

Console(config)#interface ethernet 1/9

Console(config-if)#speed-duplex 100full

Console(config-if)#no negotiation

Console(config-if)#

Related Commands

negotiation (4-127) capabilities (4-128)

negotiation

This command enables autonegotiation for a given interface30. 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

30.The settings for this parameter cannot be changed.

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