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Ethernet Configuration Commands
407
User Guidelines
When both speed and duplex are configured to auto, auto negotiation is 
enabled for the port. To disable auto-negotiation on a port, it is necessary to 
enter both the speed and duplex commands without using the auto 
parameter. Fiber ports do not support auto-negotiation and therefore require 
the operator to enter the duplex full command and the speed 
command with the desired operating bandwidth. Disabling auto-negotiation 
on 1G copper ports may lead to random frame loss as the clock master has not 
been arbitrated by the auto-negotiation process. Auto-negotiation is required 
on 10G/40G copper ports, and is recommended on all copper ports.
Example
The following example configures the duplex operation of gigabit Ethernet 
port 1/0/5 to force full duplex operation.
console(config)# interface gigabitethernet 1/0/5
console(config-if)# duplex full
flowcontrol
Use the flowcontrol command in Global Configuration mode to configure 
the flow control. To disable flow control, use the no form of this command.
Syntax
flowcontrol 
no flowcontrol
Default Configuration
Flow Control is enabled by default.
Command Mode
Global Configuration mode
User Guidelines
This command has no user guidelines.
2CSPC4.X8100-SWUM102.book  Page 407  Friday, March 15, 2013  8:56 AM