Specifications

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Cisco IOS Commands
speed
If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed
setting and then forces the speed setting to the negotiated value. The duplex setting remains as
configured on each end of the link, which could result in a duplex setting mismatch. If both the speed
and duplex are set to specific values, autonegotiation is disabled.
Note The 100BASE-FX ports on Catalyst 2950C-24, Catalyst 2955C-12, and Catalyst 2955S-12 switches do
not support the speed command. These ports operate only in 100-Mbps and full-duplex mode.
Note For guidelines on setting the switch speed and duplex parameters, refer to “Configuring the Switch
Ports” chapter in the Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide.
Examples This example shows how to set FastEthernet port 1 to 100 Mbps:
Switch(config)# interface fastethernet0/1
Switch(config-if)# speed 100
You can verify your settings by entering the show running-config privileged EXEC command.
Related Commands Command Description
duplex Specifies the duplex mode of operation for switch ports.
show running-config Displays the current operating configuration. For syntax information, select
Cisco IOS Configuration Fundamentals Command Reference for
Release 12.1 > Cisco IOS File Management Commands > Configuration
File Commands.