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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
• receive on (or desired) and send off: The port cannot send pause frames but can operate with an
attached device that is required to or can send pause frames; the port can receive pause frames.
• receive off and send on: The port sends pause frames if the remote device supports flow control but
cannot receive pause frames from the remote device.
• receive off and send desired: The port cannot receive pause frames but can send pause frames if the
attached device supports flow control.
• receive off and send off: Flow control does not operate in either direction. In case of congestion, no
indication is given to the link partner, and no pause frames are sent or received by either device.
Note For details about the command settings and the resulting flow control resolution on local and remote
ports, see the flowcontrol interface configuration command in the command reference for this release.
Beginning in pr ivileged EXEC m ode, follow thes e steps to configure flow control on an interface:
To disable flow control, use the flowcontrol receive off and flowcontrol send off interface configuration
commands.
This example shows how to turn off all flow control on a port and to display the results:
Switch# configure terminal
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# flowcontrol receive off
Switch(config-if)# flowcontrol send off
Switch(config-if)# end
Switch# show running-config
Adding a Description for an Interface
You can add a description about an interface to help you remember its function. The description appears
in the output of these commands: show configuration, show running-config, and show interfaces.
Beginning in privileged EXEC mode, follow these steps to add a description for an interface:
Command Purpose
Step 1 configure terminal Enter global configuration mode
Step 2 interface interface-id Enter interface configuration mode and the physical interface to
be configured.
Step 3 flowcontrol {receive | send} {on | off | desired}Configure the flow control mode for the port.
Step 4 end Return to privileged EXEC mode.
Step 5 show interfaces interface-id Verify the interface flow control settings.
Step 6 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1 configure terminal Enter global configuration mode
Step 2 interface interface-id Enter interface configuration mode, and enter the interface for which
you are adding a description.
Step 3 description string Add a description (up to 240 characters) for an interface.