Command:

speed

Mode:

Switch(config-if)#


Syntax:

speed {10 | 100 | auto}

no speed


Syntax Description:

10

Configures the interface to transmit at 10 Mbps.

100

Configures the interface to transmit at 100 Mbps.

auto

Turns on the Fast Ethernet auto-negotiation capability. The interface automatically operates at 10 or 100 Mbps depending on environmental factors, such as the type of media and transmission speeds for the peer routers, hubs, and switches used in the network configuration.

 


Command Description:

To configure the speed for a Fast Ethernet interface, use the speed interface configuration command. Use the no form of this command to disable a speed setting.

The auto negotiation capability is turned on for the Fast Ethernet interface by either configuring the speed auto interface configuration command or the duplex auto interface configuration command.

Table describes the system's performance for different combinations of the duplex and speed modes. The specified duplex command configured with the specified speed command produces the resulting system action.

Table: Relationship between Duplex and Speed Commands

Duplex Command Speed Command Resulting System Action

duplex auto

speed auto

Auto negotiates both speed and duplex modes.

duplex auto

speed 100 or speed 10

Auto negotiates both speed and duplex modes.

duplex half or duplex full

speed auto

Auto negotiates both speed and duplex modes.

duplex half

speed 10

Forces 10 Mbps and half duplex.

duplex full

speed 10

Forces 10 Mbps and full duplex.

duplex half

speed 100

Forces 100 Mbps and half duplex.

duplex full

speed 100

Forces 100 Mbps and full duplex.


Example:

The following example shows the configuration options for the speed command:

switch#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
switch(config)# interface fastethernet 0
switch(config-if)# speed ?

  10    Force 10 Mbps operation
  100   Force 100 Mbps operation
  auto  Enable AUTO speed configuration

Misconceptions:
None

Related commands:
duplex

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