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User Guidelines
Before attempting to force a particular duplex mode on the port operating at 10/100 Mbps, disable the
auto-negotiation on that port.
Half duplex mode can be set only for ports operating at 10 Mbps or 100 Mbps.
Example
The following example configures the duplex operation of Ethernet e5 to force full duplex operation.
Console(config)# interface ethernet e5
Console(config-if)# duplex full
5.7.7 negotiation
The negotiation interface configuration command enables auto-negotiation operation for the speed and
duplex parameters of a given interface. To disable negotiation, use the no form of this command.
Syntax
negotiation
no negotiation
Default Configuration
auto-negotiation
Command Mode
Interface Configuration (Ethernet, port-channel, out-of-band Ethernet) mode
User Guidelines
Turning off auto-negotiation on an aggregate link may, under some circumstances, make it
non-operational. If the other side has auto-negotiation turned on, it may re-synchronize all members of
the aggregated link to half-duplex operation, and may, as per the standards, set them all inactive.
Example
The following example enables autonegotiation on Ethernet e5.
Console(config)# interface ethernet e5
Console(config-if)# negotiation
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