Flowcontrol - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Also See for Catalyst 3550:
- Command reference manual (794 pages) ,
- Installation manual (154 pages) ,
- Hardware installation manual (106 pages)
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Chapter 2
Cisco IOS Commands
flowcontrol
Use the flowcontrol interface configuration command to set the receive or send flow-control value for
an 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.
On Catalyst 3550 switches, Gigabit Ethernet ports can receive and send pause frames; Fast Ethernet ports
Note
can receive only pause frames. Therefore, for 10/100 ports, the send keyword is not available.
Syntax Description
receive
send
desired
off
on
Defaults
The defaults for Gigabit Ethernet interfaces are flowcontrol receive off and flowcontrol send desired.
The defaults for Fast Ethernet interfaces are flowcontrol receive off and flowcontrol send off.
Command Modes
Interface configuration
Command History
Release
12.1(4)EA1
78-11195-09
flowcontrol {receive | send} {desired | off | on}
Set whether the interface can receive flow-control packets from a remote device.
Set whether the interface can send flow-control packets to a remote device. This
keyword is not available for 10/100 Mbps interfaces.
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 first introduced.
Catalyst 3550 Multilayer Switch Command Reference
flowcontrol
2-89
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