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Using the BayStack 350 10/100/1000 Series Switch
4-6
309979-A Rev 00
Port Connection Problems
Port connection problems can usually be traced to a poor cable connection or an
improper connection of the port cables at either end of the link. These types of
problems can be remedied by making sure that the cable connections are secure
and that the cables are connected to the correct ports at both ends of the link.
Port connection problems can also be traced to the autonegotiation mode or the
port interface.
Autonegotiation Modes
Port connection problems can occur when a port (or station) is connected to
another port (or station) that is not operating in a compatible mode (for example,
connecting a full-duplex port on one station to a half-duplex port on another
station).
The BayStack 350 switch negotiates port speeds according to the IEEE 802.3u
autonegotiating standard. The switch adjusts (autonegotiates) its port speed and
duplex mode to match the best service provided by the connected station, up to
100 Mb/s in full-duplex mode.
• If the connected station uses a form of autonegotiation that is not compatible
with the IEEE 802.3u autonegotiating standard, the BayStack 350 switch
cannot negotiate a compatible mode for correct operation.
• If the autonegotiation feature is not present or is not enabled at the connected
station, the BayStack 350 switch may not be able to determine the correct
duplex mode.
In both situations, the BayStack 350 switch “autosenses” the speed of the
connected station and, by default, reverts to half-duplex mode. If the connected
station is operating in full-duplex mode, it cannot communicate with the switch.
To correct this mode mismatch problem, follow these steps:
1.
Use the Port Configuration screen to disable autonegotiation for the
suspect port (see “Port Configuration” on page 3-34).
2.
Manually set the Speed/Duplex field to match the speed/duplex mode of
the connected station (see Table 3-14 on page 3-35).
You may have to try several settings before you find the correct speed/duplex
mode of the connected station.