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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 10 Configuring Interface Characteristics
Configuring Ethernet Interfaces
This example shows how to set the interface speed to 10 Mbps and the duplex mode to half on a port:
Switch# configure terminal
Switch(config)# interface fastethernet0/3
Switch(config-if)# speed 10
Switch(config-if)# duplex half
Switch(config)# end
Setting the Interface Speed and Duplex Parameters on an LRE Switch Port
Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for an LRE
interface on an LRE switch:
Use the no local speed and no local duplex interface configuration commands to return the interface to
the default speed and duplex settings. To return all interface settings to the defaults, use the default
interface interface-id interface configuration command.
Configuring Media Types for Gigabit Ethernet Interfaces on LRE Switches
On the LRE switches, use the media-type interface configuration command to configure the media type
for Gigabit Ethernet interfaces. You can enable or disable fiber-optic or copper (10/100/1000)
connections. You can also manually set the port to select an SFP connector or an RJ45 connector. Use
the no form of this command to return to the default setting of SFP-preferred. To configure media types,
use the media-type {auto-select | rj45 | sfp} interface configuration command.
For more information, see the command reference for this release.
Configuring IEEE 802.3z Flow Control on Gigabit Ethernet Ports
Flow control is supported only on the 10/100/1000, 1000BASE-SX, GBIC-module, and SFP-module
ports. Flow control enables connected Gigabit Ethernet ports to control traffic rates during congestion
by allowing congested nodes to pause link operation at the other end. If one port experiences congestion
and cannot receive any more traffic, it notifies the other port to stop sending until the condition clears.
When the local device detects any congestion at its end, it can notify the link partner or the remote device
of the congestion by sending a pause frame. Upon receipt of a pause frame, the remote device stops
sending any data packets, which prevents any loss of data packets during the congestion period.
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
local speed {10 | 100} Enter the appropriate speed parameter for the interface.
Step 4
local duplex {full | half} Enter the duplex parameter for the interface.
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Display the LRE 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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