Generally, two symptoms occur when a device restarts.
Terminal Does Not Display Anything Or Displays Garbled Characters
Device Restarts Unexpectedly
Perform the following steps to rectify the fault:
Terminal Does Not Display Anything Or Displays Garbled Characters
Check the power indicator on the router's front panel. If the power indicator is On, the power module is working properly. If the power indicator is Off, rectify the fault according to An AR Router Fails to Be Powered On.
Check whether the correct combo interface is selected and whether the physical attributes of the PC is consistent with those of the serial interface. The default parameters are as follows:
Baud rate: 9600
Data bit: 8
Stop bit: 1
Parity check: None
Flow control: None
Ensure that the cable is firmly connected to the serial interface. You can replace it with a new cable to verify whether the cable is faulty.
Device Restarts Unexpectedly
Ensure that the device resetting is not caused by USB deployment, CWMP, or Auto-Config deployment.
<Huawei> display reset-reasonThe LPU frame[0] board[1]'s reset total 10, detailed information: -- 1. 03/10 10:58:08, Reset No.: 10 Reason: Reset by user command -- 2. 03/10 10:31:02, Reset No.: 9 Reason: Reset by user command -- 3. 03/08 15:27:39, Reset No.: 8 Reason: Reset by user command -- 4. 03/07 15:43:28, Reset No.: 7 Reason: Reset by user command -- 5. 03/06 17:11:21, Reset No.: 6 Reason: Reset by user command -- 6. 03/06 12:04:46, Reset No.: 5 Reason: Reset by user command -- 7. 03/06 11:25:46, Reset No.: 4 Reason: Reset by user command -- 8. 03/05 18:49:12, Reset No.: 3 Reason: Reset by user command -- 9. 03/05 11:31:18, Reset No.: 2 Reason: Reset by user command -- 10. 03/04 22:09:33, Reset No.: 1 Reason: A link fault fails to be rectified. The LPU frame[0] board[2] has no reset records. The LPU frame[0] board[3] has no reset records. The LPU frame[0] board[4] has no reset records. The LPU frame[0] board[5] has no reset records The LPU frame[0] board[6] has no reset records. The LPU frame[0] board[7] has no reset records. The LPU frame[0] board[8] has no reset records. The LPU frame[0] board[9] has no reset records. The LPU frame[0] board[10] has no reset records. The MPU frame[0] board[13] has no reset records. The MPU frame[0] board[14]'s reset total 10, detailed information: -- 1. 03/10 10:58:12, Reset No.: 10 Reason: Reset by user command -- 2. 03/10 10:31:21, Reset No.: 9 Reason: Reset by user command -- 3. 03/08 15:28:15, Reset No.: 8 Reason: Reset by user command -- 4. 03/07 15:43:46, Reset No.: 7 Reason: Reset by user command -- 5. 03/06 17:11:53, Reset No.: 6 Reason: Reset by user command -- 6. 03/06 12:05:05, Reset No.: 5 Reason: Reset by user command -- 7. 03/06 11:25:51, Reset No.: 4 Reason: Reset by user command -- 8. 03/05 18:49:22, Reset No.: 3 Reason: Reset by user command -- 9. 03/05 11:31:39, Reset No.: 2 Reason: Reset by user command -- 10. 02/29 18:33:41, Reset No.: 1 Reason: Reset by user command
If the fault is not caused by the preceding reasons, a hardware fault occurs or the software has bugs. Contact technical support personnel.
Perform the following operations to collect related information and provide the information to the technical support personnel.
Do not power off the device before information is collected.
Collect information according to Information Collection.
Run the following commands to collect related information.
<Huawei> system-view[Huawei] diagnose[Huawei-diagnose] display reset-reason[Huawei-diagnose] display inspect black-box record 6 0 0 0[Huawei-diagnose] display inspect black-box record 8 0 0 0[Huawei-diagnose] display inspect black-box record 10 0 0 0[Huawei-diagnose] display inspect black-box record 11 0 0 0[Huawei-diagnose] display inspect black-box record 12 0 0 0[Huawei-diagnose] display inspect black-box record 13 0 0 0[Huawei-diagnose] display inttrace level 1[Huawei-diagnose] display inttrace level 2[Huawei-diagnose] display inttrace level 3[Huawei-diagnose] display lastwords all
2.If the fault is not caused by the preceding reasons, a hardware fault occurs or the software has bugs. Contact technical support personnel.
Perform the following operations to collect related information and provide the information to the technical support personnel.
Do not power off the device before information is collected.
Collect information according to Information Collection.
Run the following commands to collect related information.
<Huawei> system-view[Huawei] diagnose[Huawei-diagnose] display reset-reason[Huawei-diagnose] display inspect black-box record 6 0 0 0[Huawei-diagnose] display inspect black-box record 8 0 0 0[Huawei-diagnose] display inspect black-box record 10 0 0 0[Huawei-diagnose] display inspect black-box record 11 0 0 0[Huawei-diagnose] display inspect black-box record 12 0 0 0[Huawei-diagnose] display inspect black-box record 13 0 0 0
