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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 9 Configuring the Switch Interfaces
Configuring Switch Interfaces
These rules apply to flow control settings on the device:
• receive on (or desired) and send on: Flow control operates in both directions; both the local and
the remote devices can send pause frames to show link congestion.
• receive on (or desired) and send desired: The port can receive pause frames and can send pause
frames if the attached device supports flow control.
• 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, refer to the flowcontrol interface configuration command in the command reference for this
release.
Beginning in privileged EXEC mode, follow these 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 Gigabit Ethernet interface 0/1 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
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.