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3-14 CHAPTER 3: ACCESSING THE SWITCHConfiguringAutonegotiationBy default, the Switch 3800 is configured to use autonegotiation for allports. Autonegotiation on 10/100 Mbps ports is used to automaticallydetermine speed and duplex settings. You can select to manuallyconfigure the duplex and speed settings of 10/100 Mbps ports. Manualconfiguration would be used when the remote device does not supportautonegotiation or when an interoperability issue exists.The Switch 3800 Gigabit Ethernet port only supports a speed of 1,000Mbps and full duplex. Even though these parameters are fixed,autonegotiation on Gigabit links still allows proper link initialization andshould be used whenever possible. Manual configuration would beused when the remote device does not support autonegotiation orwhen an interoperability issue exists.10/100 port settings Fast Ethernet ports can connect to either 10BASE-T or 100BASE-TXnetworks. By default, the ports autonegotiate port speed and duplexsettings. You can manually determine these settings by turningautonegotiation off and providing speed and duplex settings. Toconfigure port speed and duplex settings on 10/100 Mbps ports, usethe following command:config port auto off (speed [10 | 100]} duplex[half | full]To restore autonegotiation, use the following command:config port auto onGigabit port settings By default the Gigabit port on the Switch 3800 uses autonegotiation toestablish proper link initialization. Speed and duplex settings cannot bemodified. To turn off autonegotiation, use the following command:config port auto off duplex fullThe duplex setting must be provided even though the duplex settingmay not be modified. To restore autonegotiation, use the followingcommand:config port auto on
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