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Thu, Jun 15, 2017 11:26 pm

Changing the duplex setting for a port on a Cisco switch

You can determine the speed and duplex settings for a port on a Cisco switch with the show interfces port_designation status. E.g.:

Huron>show interfaces fa0/1 status

Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        connected    1            full     10 10/100BaseTX

Often ports will be set to autonegotiate the speed and duplex settings with the equipment connected to the port. But sometimes that autonegotiation process may not work as expected requiring you to manually set the parameters. E.g, if the piece of equipment being connected to the port on the Cisco switch is configured for a fixed mode of operation while the port on the switch is configured for autonegotiate, the speeds may be configured for matching values on both sides but there may be a duplex mismatch. As a result of that mismatch cyclic redundancy check (CRC) errors may be reported for the port on the switch. You can manually set the duplex setting by entering the enable command and then the enable password when prompted. Then enter the configure command and then enter duplex followed by full or half, e.g., duplex full.

[/hardware/network/switch/cisco] permanent link

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