10-12
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 10 Configuring Interface Characteristics
Configuring Ethernet Interfaces
For example, if you enter the speed 100 and the duplex half interface configuration commands and
the fiber-optic SFP-module port is active, the switch attempts to autonegotiate the speed and duplex
settings as 1000 Mbps with full autonegotiation.
If you enter the speed 100 and the duplex half interface configuration commands and the
10/100/1000 port is active, the switch advertises the speed and duplex settings as 10 Mbps and half
duplex.
• On the LRE ports on an LRE switch, use the local speed and the local duplex interface
configuration commands.
Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
Setting the Interface Speed and Duplex Parameters on a Non-LRE Switch Port
Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical
interface on a non-LRE switch:
Use the no speed and no duplex interface configuration commands to return the interface to the default
speed and duplex settings (autonegotiate). To return all interface settings to the defaults, use the default
interface interface-id interface configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode and the physical interface
identification.
Step 3
speed {10 | 100 | 1000 | auto [10 | 100 |
1000] | nonegotiate}
Enter the appropriate speed parameter for the interface, or enter auto
or nonegotiate.
If you use the 10, 100, or 1000 keywords with the auto keyword, the
port only autonegotiates at the specified speeds.
Note The 1000 keyword is available only for 10/100/1000 Mbps
ports. 100BASE-FX ports operate only at 100 Mbps.
1000BASE-SX ports and GBIC module ports operate only at
1000 Mbps. The nonegotiate keyword is available only for
1000BASE-SX, -LX, and -ZX GBIC ports.
Step 4
duplex {auto | full | half} Enter the duplex parameter for the interface. For configuration
guidelines, see the “Configuration Guidelines” section on page 10-11.
Note The duplex keyword is not available on GBIC ports.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces interface-id Display the interface speed and duplex mode configuration.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
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