Command Line Interface
744 1553-KDU 137 365 Uen D 2006-06-16
• 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. Note that auto-
negotiation cannot be disabled for Gigabit Ethernet ports, which only
operate at 1000full (1 Gbps full-duplex).
• When using the negotiation command to enable auto-negotiation,
the 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.
• 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.
Example
The following example enables flow control on port 5.
Related Commands
negotiation (section 7.9.4 on page 740)
capabilities (flowcontrol, symmetric) (section 7.9.5 on page 741)
Console(config)#interface ethernet 1/5
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#
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