Cisco Catalyst 2950 Software Guide

10-2
Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 10 Configuring the Switch Ports
Changing the Port Speed and Duplex Mode
Connecting to Devices That Do Not Autonegotiate
To connect to a remote 100BASE-T device that does not autonegotiate, set the duplex setting to Full or
Half, and set the speed setting to Auto. Autonegotiation for the speed setting selects the correct speed
even if the attached device does not autonegotiate, but the duplex setting must be explicitly set.
To connect to a remote Gigabit Ethernet device that does not autonegotiate, disable autonegotiation on
the local device, and set the duplex and flow control parameters to be compatible with the other device.
Setting Speed and Duplex Parameters
Beginning in privileged EXEC mode, follow these steps to set the speed and duplex parameters on a port:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to be
configured.
Step 3
speed {10 | 100 | 1000 | auto} Enter the speed parameter for the port.
• The 10/100/1000 ports operate in 10 or 100 Mbps when they
are set to half- or full-duplex mode, but only operate in
full-duplex mode when set to 1000 Mbps.
• The GBIC module ports operate only at 1000 Mbps.
• 100BASE-FX ports operate only at 100 Mbps in full-duplex.
Note The Catalyst 2950C-24 does not support the speed and
duplex interface configuration commands in
IOS Release 12.1(6)EA2.
Step 4
duplex {full | half | auto} Enter the duplex parameter for the port.
• The 10/100/1000 ports operate in either half- or full-duplex
mode when they are set to 10 or 100 Mbps, but when set to 1000
Mbps, they only operate in full-duplex mode.
• 100BASE-FX ports operate only at 100 Mbps in full-duplex.
Note The Catalyst 2950C-24 does not support the speed and
duplex interface configuration commands in
IOS Release 12.1(6)EA2.
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Verify your entries.
Step 7
copy running-config
startup-config
(Optional) Save your entry in the configuration file. This retains the
configuration when the switch restarts.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz