Solution To Device Login Failure - Huawei AR Series Quick Maintenance Manual

Solution to Device Login Failure

If you fail to log in to the router through Telnet or STelnet, log in to the router through the console
(also called serial) port and check the Telnet or STelnet configuration.
If you still fail to log in to the router through the console port, you cannot perform any operations
related to CLI. In this situation, you need to perform the following operations:
Before performing the following operations, ensure that the user service
is interrupted. If the user service is not interrupted, these operations will
affect user service. Collect the fault information and contact your agent
or Huawei enterprise technical support hotline.
Check and recover the power supply system.
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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 router or power supply switch. If your router has multiple power modules installed,
at least one power module must be switched on.
2. Check the PWR indicator of the power module. If the indicator is off, the power module input
is abnormal. Request the electrician to recover the power lines in the equipment room, rack,
or cabinet.
3. Check the running indicator of the power supply. If the indicator is off, the power module
output is abnormal. Replace the power supply.
4. Check the STATUS indicator of the power supply. If the indicator is on, the power module is
abnormal. Replace the power supply.
5. 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.
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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
router's console port. If not, modify the communication parameters.
The default settings of the router'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).
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