Flowcontrol - Cisco Catalyst 3560-X Command Reference Manual
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- Software configuration manual (1538 pages) ,
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flowcontrol
flowcontrol
Note
Syntax Description
Defaults
Command Modes
Command History
Usage Guidelines
Catalyst 3750-X and 3560-X Switch Command Reference
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Use the flowcontrol interface configuration command on the switch stack or on a standalone switch to
set the receive flow-control state for an interface. When flow control send is operable and on for a device
and it detects any congestion at its end, it notifies the link partner or the remote device of the congestion
by sending a pause frame. When flow control receive is on for a device and it receives a pause frame, it
stops sending any data packets. This prevents any loss of data packets during the congestion period.
Use the receive off keywords to disable flow control.
flowcontrol receive {desired | off | on}
The Catalyst 3650-X and 3560-X switches can receive, but not send, pause frames.
receive
Set whether the interface can receive flow-control packets from a remote device.
desired
Allow an interface to operate with an attached device that is required to send
flow-control packets or with an attached device that is not required to but can send
flow-control packets.
off
Turn off the ability of an attached device to send flow-control packets to an interface.
on
Allow an interface to operate with an attached device that is required to send
flow-control packets or with an attached device that is not required to but can send
flow-control packets.
The default is flowcontrol receive off.
Interface configuration
Release
Modification
12.2(53)SE2
This command was introduced.
The switch does not support sending flow-control pause frames.
Note that the on and desired keywords have the same result.
When you use the flowcontrol command to set a port to control traffic rates during congestion, you are
setting flow control on a port to one of these conditions:
receive on or desired: The port cannot send pause frames, but can operate with an attached device
•
that is required to or is able to send pause frames. The port can receive pause frames.
receive 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.
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Chapter 2
Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
OL-21522-02
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