Using the BayStack 410-24T 10BASE-T Switch1-18 309985-C Rev 00Configuration ParametersCertain configuration parameters, including the system characteristics strings,some VLAN parameters, IGMP configuration parameters, and the MultiLinkTrunk names are stored in flash memory. These parameters are updated every 10minutes or whenever you issue the Save Current Settings command (also,whenever you issue the Reset command).Autosensing and AutonegotiationBayStack 410-24T switches are autosensing and autonegotiating devices. Theterm autosense refers to a port’s ability to sense the speed of an attached device.The term autonegotiation refers to a standardized protocol (IEEE 802.3u) thatexists between two IEEE 802.3u-capable devices.Because the BayStack 410-24T switch uses fixed 10BASE-T ports, theautonegotiation feature does not negotiate the port speed when connecting toanother IEEE 802.3u-capable device. The BayStack 410-24T switch onlynegotiates the best duplex mode.When an optional 10/100 BASE-T MDA is installed, the autonegotiation featureselects the best of both speed and duplex modes for that connection. The MDAports negotiate down from 100 Mb/s speed and full-duplex mode until a supportedspeed and duplex mode is acknowledged by the attached device.Autosensing is used when the attached device is not capable of autonegotiation oris using a form of autonegotiation that is not compatible with the IEEE 802.3uautonegotiation standard. In this case, because it is not possible to sense theduplex mode of the attached device, the BayStack 410-24T switch reverts tohalf-duplex mode.For more information about autosensing and autonegotiation modes, see“Autonegotiation Modes” on page 4-7.Note: Do not power off the switch within ten minutes of changing anyconfiguration parameters, unless you first issue the Save Current Settingscommand. Powering down the switch within 10 minutes of changingconfiguration parameters (without resetting) can cause the changedconfiguration parameters to be lost.
