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Catalyst 6500 Series Switch Command Reference—Release7.6
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Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands
set port flowcontrol
set port flowcontrol
To configure a port to send or receive pause frames, use the set port flowcontrol command. Pause
frames are special packets that signal a source to stop sending frames for a specific period of time
because the buffers are full.
set port flowcontrol mod/port {receive | send} {off | on | desired}
Syntax Description
Defaults Flow-control defaults vary depending upon port speed:
•Gigabit Ethernet ports default to off for receive (Rx) and desired for transmit (Tx)
•Fast Ethernet ports default to off for receive and on for transmit
On the 24-port 100BASE-FX and 48-port 10/100 BASE-TX RJ-45 modules, the default i s off for receive
and off for send.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines This command is not supported by the NAM.
When you configure the 24-port 100BASE-FX and 48-port 10/100 BASE-TX RJ-45 modules, you can
set the receive flow control to on or off and the send flow control to off.
All Catalyst Gigabit Ethernet ports can receive and process pause frames from remote devices.
To obtain predictable results, use these guidelines:
•Use send on only when remote ports are set to receive on or receive desired.
•Use send off only when remote ports are set to receive off or receive de si re d .
•Use receive on only when remote ports are set to send on or send desired.
•Use send off only when remote ports are set to receive off or receive de si re d .
mod/port Number of the module and the port on the module.
receive Specifies a port processes pause frames.
send Specifies a port sends pause frames.
off Prevents a local port from receiving and processing pause frames from
remote ports or from sending pause frames to remote ports.
on Enables a local port to receive and process pause frames from remote ports
or send pause frames to remote ports.
desired Obtains predictable results regardless of whether a remote port is set to on,
off, or desired.