10
Solution to Device Login Failure
If you fail to log in to the switch through Telnet or STelnet, log in to the switch through the Console (also
called serial) port and check the Telnet or STelnet configuration.
If you still fail to log in to the switch through the Console port, you cannot perform any operations related
to CLI. In this situation, you need to perform the following operations:
Perform the following operations only when you confirm that the user
service has been interrupted, because these operations will affect user
service. Collect the fault information and contact your agent or Huawei
enterprise technical support hotline.
1
Check and recover the power supply system.
If the indicators of all cards are off and the fans do not work (listening to the noise), the power supply
system fails.
1.Check the power supply switches. If your switch has multiple power supplies installed, at least one
power supply must be switched on.
2.Check the RUN indicator of the power supply. If the indicator is off, the power supply input is
abnormal. Request the electrician to recover the power lines in the equipment room, rack, or cabinet.
3.Check the ALM indicator of the power supply. If the indicator is on, the power supply is abnormal.
Replace the power supply.
4.If the cards cannot be powered on and no error is found in the preceding checks, contact your agent
or Huawei enterprise technical support hotline.
2
Check and modify the communication parameters of the COM port on your computer.
Check whether the communication parameters of the COM port are the same as the those of the
switch's Console port. If not, modify the communication parameters.
The default settings of the switch's Console port parameters include 9600 bps, 8 data bits, 1 stop bit,
no parity check, and no flow control (the actual settings may be different).
3
Remove/reinstall or replace the MPU.
If the power supply system and Console port work properly, the MPU may be faulty. If your switch
has two MPUs installed, remove/reinstall the problematic MPU. If your switch has only one MPU
installed, replace it with a new one.
