Cisco C3230-1W-49-K9 Hardware Guide - Page 42
Ethernet Port Speed and Duplex Mode, Command, Purpose
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Chapter 2 Cisco 3270 Rugged Router Card Ethernet Port Speed and Duplex Mode The router cannot automatically negotiate port speed and duplex mode unless the connecting port is configured speed auto, duplex auto, or no speed. If the port speed is set to a value other than auto, such as 10, 100, or 1000-Mbps, configure the remote link partner port to match the local settings; do not configure the link partner port to auto. If a copper Gigabit Ethernet port speed is configured as 1000-Mbps, it must be configured as duplex auto mode; otherwise the link will not come up. We recommend that you use the speed auto command and duplex auto command to configure a Gigabit Ethernet port. The fiber-optic Gigabit Ethernet port does not allow users to configure the mode as speed or duplex. The port speed and mode are determined by the SFP module. Note Changing the Ethernet port speed and duplex mode configuration might shut down and reenable the interface during the reconfiguration. The procedure to set the port speed for a copper Gigabit Ethernet port is as follows: Step 1 Step 2 Default Command Router(config)# interface GigabitEthernet slot/port Router(config-if)# speed {10 | 100 | 1000 | auto} Router(config-if)# no speed Purpose Selects the Ethernet port to be configured. Sets the speed of the Ethernet interface. Reverts to the default configuration (speed auto). If you set the port speed to auto on a 10/100/1000-Mbps Ethernet port, speed is autonegotiated. To set the mode on a copper Gigabit Ethernet port to duplex? Step 1 Step 2 Default Command Router(config)# interface GigabitEthernet slot/port Router(config-if)# duplex [auto | full | half] Router(config-if)# no duplex Purpose Selects the Ethernet port to be configured. Sets the duplex mode of the Ethernet port. Reverts to the default configuration (duplex auto). Note The Gigabit Ethernet optical fiber interface only supports full duplex mode; a Cisco IOS command to set the mode is not is supported. Cisco 3200 Series Router Hardware Reference 2-6 OL-5816-10