178 Chapter 4 Troubleshooting209418-AIn both situations, the BayStack 420 Switch “autosenses” the speed of theconnected station and, by default, reverts to half-duplex mode. If the connectedstation is operating in full-duplex mode, it cannot communicate with the switch.To correct this mode mismatch problem:1 Use the Port Configuration screen to disable autonegotiation for the suspectport (see “Port Configuration screen” on page 129).2 Manually set the Speed/Duplex field to match the speed/duplex mode of theconnected station (see Table 24 on page 130).You may have to try several settings before you find the correct speed/duplexmode of the connected station.If the problem persists:1 Disable the autonegotiation feature at the connected station.2 Manually set the speed/duplex mode of the connected station to the samespeed/duplex mode you have manually set for the BayStack 420 Switch port.Port interfaceEnsure that the devices are connected using the appropriate crossover orstraight-through cable (see Appendix D, “Connectors and pin assignments,” onpage 195), or that autonegotiation or autopolarity is active.
