Flowcontrol - Cisco Catalyst 2950 Command Reference Manual

flowcontrol

flowcontrol
Use the flowcontrol interface configuration command to set the receive or send flow-control value for
a Gigabit Ethernet interface. When flow control send is 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 the remote 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 and send off keywords to disable flow control.
This flowcontrol command applies only to switch and module ports operating at 1000 Mbps.
Note
Syntax Description receive
send
desired
off
on
Defaults The defaults for 10/100/1000, GBIC-module ports, and small form-factor pluggable (SFP) -module ports
are flowcontrol receive off and flowcontrol send desired.
Command Modes Interface configuration
Command History Release
12.0(5.2)WC(1)
12.1(6)EA2
Catalyst 2950 and Catalyst 2955 Switch Command Reference
2-114
flowcontrol {receive | send} {desired | off | on}
Sets whether the interface can receive flow-control packets from a remote device.
Sets whether the interface can send flow-control packets to a remote device.
When used with receive, 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.
When used with send, the interface sends flow-control packets to a remote device
if the remote device supports it.
When used with receive, turns off an attached device's ability to send flow-control
packets to an interface. When used with send, turns off the local port's ability to
send flow-control packets to a remote device.
When used with receive, 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.
When used with send, the interface sends flow-control packets to a remote device
if the remote device supports it.
Modification
This command was introduced.
The asymmetric and symmetric keywords were replaced with the receive,
send, off, on, and desired keywords.
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
OL-10102-01