Nortel Passport 8000 Series Installing And Maintaining page 93

• If the autonegotiation feature is not present or is not enabled at the connected
station, the Passport 8100 module may not be able to determine the correct
duplex mode.
In both situations, the Passport 8100 module 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:
1
Use the CLI to disable autonegotiation for the suspect port.
See Configuring Network Management for the appropriate CLI commands.
2
Use the CLI to set the speed and duplex mode of the port to match the speed
and duplex mode of the connected station.
You may need to try several settings before you find the correct speed/duplex
mode for the connected station.
If the problem persists, follow these additional steps:
1
Using the CLI, disable the autonegotiation feature at the connected station.
2
Manually set the speed/duplex mode of the connected station to the same
speed/duplex mode that you manually set for the Passport 8100 module port.
Note: Nortel Networks recommends that you manually set the Passport
8100 module port to the desired speed/duplex mode when connecting to
any of the following Nortel Networks products:
• Nortel Networks 28000 product family
• Nortel Networks 58000 product family
• BayStack
Chapter 4 Operating the Passport 8000 Series switch 93
* 302T switch (100 Mb/s port)
Installing and Maintaining the Passport 8000 Series Chassis