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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 9 Configuri ng th e Switch Interfaces Configuring Switch Interfaces
These rules apply to flow control settings on the device:
•rec eiv e on (or desired) and send on: Flow control oper ates in bo th directions; both the loc al and
the remote devices can send pause frames to show link congestion.
•receive on (or desired) and send desired: The por t can receive pause fr ames an d can sen d pause
fram es if th e atta ched device suppor ts flow cont rol.
•rec eiv e on (or desired) and se nd off: The po rt cann ot send pa use fra mes but can op er ate wi th an
attached device that is required to or can send pause frames; the po rt 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 desir ed: The po rt cann ot receiv e pause fr ames b ut can send paus e frames if the
attach ed device sup por ts fl ow co ntro l.
•receive off and send off: Flo w cont rol does not oper ate in e ither direct ion. I n case o f con gestion, n o
indicati on is given to the link partne r, a nd no pause frame s are sen t or received by either device.
Note For details about the command settings and the resulting flow control resolution on local and r emote
ports, re fer to the flowcontrol interface configuration command in the command reference for this
release.
Begi n n i n g in p r iv il e g ed EX E C m od e , f o l low t hese st e p s to configure flow control on an interface:
To disable flow control, use the flowcontrol receive off an d flowcontrol send off interface
configurati on comm a nds.
This example shows ho w 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 gl obal configurat ion mode
Step 2 int er fa ce interface-id Enter in terface config uration mode and the physical interface to
be configured .
Step 3 flowcontrol {receive | send} {on | off | desir ed} Configure the f low contro l m ode for t he po rt .
Step 4 end Return to p rivileged EXEC mode.
Step 5 show interfaces interface-id Verify the interface flow control settin gs.
Step 6 copy running-config startup-config (Optional) Save your entries in the configuration file.