Chapter 10 Configuring The Switch Ports; Changing The Port Speed And Duplex Mode - Cisco Catalyst 2950 Software Manual

Configuring the Switch Ports
This chapter provides information about changing port configuration settings. It includes command-line
interface (CLI) procedures for using commands that have been specifically created or changed for the
Catalyst 2950 switches. For complete syntax and usage information for the commands used in this
chapter, refer to the Catalyst 2950 Desktop Switch Command Reference.
Certain port features can conflict with one another. Review the
Note
section on page 14-1
This chapter does not repeat the concepts and CLI procedures provided in the standard Cisco IOS
Release 12.1 documentation. For information about the standard IOS Release 12.1 commands, refer to
the IOS documentation set available from the Cisco.com home page at Service and Support >
Technical Documents . On the Cisco Product Documentation home page, select Release 12.1 from the Cisco
IOS Software drop-down list.
For information about configuring these settings from Cluster Management Suite (CMS), refer to the
online help.
Some features can be implemented only by using the CLI.
Note

Changing the Port Speed and Duplex Mode

Caution If you reconfigure the port through which you are managing the switch, a Spanning Tree Protocol (STP)
reconfiguration could cause a temporary loss of connectivity.
Follow these guidelines when configuring the duplex and speed settings:
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•
•
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before you change the port settings.
Gigabit Ethernet ports should always be set to 1000 Mbps but can negotiate full duplex with the
attached device.
Gigabit Ethernet ports that do not match the settings of an attached device lose connectivity and do
not generate statistics.
GigaStack-to-GigaStack stack connections operate in half-duplex mode, and
GigaStack-to-GigaStack point-to-point connections operate in full-duplex mode.
If STP is enabled, the switch can take up to 30 seconds to check for loops when a port is
reconfigured. The port LED is amber while STP reconfigures.
C H A P T E R
"Avoiding Configuration Conflicts"
Catalyst 2950 Desktop Switch Software Configuration Guide
10
10-1