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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
flowcontrol
flowcontrol
To set the receive flow-control state for an interface, use the flowcontrol command in interface
configuration mode. 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.
To disable flow control, use the receive off keywords.
flowcontrol receive {desired | off | on}
Note The switch can only receive pause frames.
Syntax Description
Defaults The default is flowcontrol receive off.
Command Modes Interface configuration
Command History
Usage Guidelines 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 out pause frames, but can operate with an attached
device that is required to or is able to send pause frames; the port is able to 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.
Table 2-2 shows the flow control results on local and remote ports for a combination of settings. The
table assumes that receive desired has the same results as using the receive on keywords.
receive Sets whether the interface can receive flow-control packets from a remote device.
desired Allows 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 Turns off the ability of an attached device to send flow-control packets to an interface.
on Allows 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.
Release Modification
12.2(52)EY This command was introduced.
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