duplex
Command
Duplex
UseThis command is used to set the duplex mode on an interface.
Syntax
Router(config-if)#duplex <auto or full or half>
Option
| <auto> |
Automatically determine the duplex mode by checking with the neighbor |
| <full> |
Sets full duplex mode |
| <half> |
Sets half duplex mode |
Example

In this example, we will set Fa0/0 to use full and half-duplex modes.
2611XM(config)#int fa0/0
2611XM(config-if)#duplex full
2611XM(config-if)#do sh int fa0/0 | in duplex
Full-duplex, 100Mb/s, 100BaseTX/FX
2611XM(config-if)#duplex half
2611XM(config-if)#do sh int fa0/0 | in duplex
Half-duplex, 100Mb/s, 100BaseTX/FX
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