I
NTERFACE
C
OMMANDS
3-91
optimal settings will be determined by the capabilities command. To
enable flow control under auto-negotiation, “flowcontrol” must be
included in the capabilities list for any port.
• To force operation to the mode specified in a flowcontrol command,
use the no negotiation command to disable auto-negotiation on the
selected interface.
• To force flow control on or off (with the flowcontrol or no flowcontrol
command), use the no negotiation command to disable
auto-negotiation on the selected interface.
• Avoid using flow control on a port connected to a hub unless it is
actually required to solve a problem. Otherwise back pressure jamming
signals may degrade overall performance for the segment attached to
the hub.
• Due to a hardware limitation, flow control only works on those ports
located in the same chip (ports 1-12 and ports 13-24). Cross-chip flow
control does not work.
Example
The following example enables flow control on port 5.
Related Commands
capabilities (3-89) (flowcontrol (3-90), symmetric)
shutdown
Use this command to disable an interface. To restart a disabled interface,
use the no form.
Syntax
shutdown
no shutdown
Console(config)#interface ethernet 1/5
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#
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