H3C Switches Quick Start Maintenance Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The information in this document is subject to change without notice.

Contents

Preparing for maintenance· 1

Maintaining the device· 2

Checking the LED status· 2

Checking critical or minor alarms· 3

Viewing alarm information· 3

Viewing log information· 4

Checking the health status of the device· 4

Checking the CPU usage of the device· 4

Checking the memory usage of the device· 5

Checking the operational status of fan trays· 7

Checking the operational status of power supplies· 8

Checking information about temperature sensors on the device· 10

Checking the operational status of cards and subcards· 11

Collecting and reporting failure information· 13

Collecting basic failure information· 13

Collecting log information· 13

Collecting diagnostic information· 14

Troubleshooting login failure· 16

Checking for power supply system failure· 16

Checking for inconsistent serial communication parameter settings between the configuration terminal and the console port 16

Checking for MPU failure (on modular devices) 17

Resetting the device· 17

Contacting H3C Support 17

Safety and configuration cautions and guidelines· 18

Hardware safety guidelines· 18

CLI-based configuration cautions and guidelines· 19

 

Preparing for maintenance

1.     Obtain the network topology graph and data plan (including interfaces, VLANs, and IP addresses) and paste them at a place where it can be seen easily.

2.     Prepare the tools and cables that might be required for maintenance. See Table 1.

Table 1 Tools and cables for maintenance

Item	Description
Cables	·     One serial console cable—Log in to the device from the console port. You can purchase a DB9-to-RJ45 console cable or USB-to-RJ45 console cable from H3C. To use a USB-to-RJ45 console cable, first download the USB-to-RJ45 console driver from the H3C official website and install it on the configuration terminal. ·     Two straight-through network cables—Debug management network ports or other services. ·     Extension cable connectors, which are used to extend cables when their length is not enough. ·     Optical fibers and SFP/SFP+/QSFP+/QSFP28/CFP2 transceiver modules or cables—Connect to the peer device.
Maintenance terminal	Typically, a maintenance terminal is a laptop used to install the serial communication software for device login.
Auxiliary instruments and meters	·     Optical power meter—Test optical power and receiving sensitivity for fiber ports. ·     Hygrothermograph—Test the temperature and humidity of the environment and fan outlet.
Other tools	·     Detachable wrench—Install, remove, or secure some service modules. ·     Cleaning box for optical fiber end faces. ·     Connector cleaning rod. ·     Cable tie (cable clamp). ·     Screwdrivers—Phillips screwdrivers and flat-head screwdrivers. ·     Diagonal pliers.

 

3.     Obtain contact information of H3C Support.

4.     Access the H3C official website to apply for a user account. You can use the user account to browse or download product documents.

The command output in this document is for your reference only.

Maintaining the device

For information about the support for the commands in this section, see the command reference for the device.

To check alarms, health status, and device status, and record failure information, log in to the device through the console port, Telnet, or SSH. For how to log in to the device, see the configuration guide for the device. If you fail to log in to the device, see "Troubleshooting login failure."

Figure 1 Maintenance flow

 

Checking the LED status

The device provides various LEDs to indicate the operating status of different objects. If a LED indicates an abnormal state, record the failure information immediately. For how to troubleshoot and resolve the issue, see the installation guide for the switch. If the issue persists, contact H3C Support.

For information about the descriptions of the LEDs, see the installation guide or hardware information and specifications for the switch.

Checking critical or minor alarms

Only some switch models support the display alarm command. For other switch models, check the log information for alarms. For the procedure, see "Viewing log information." For more information about log information, see the configuration guide or system log messages for the switch.

If a network management system is deployed, you can also identify whether an alarm has occurred from the network management system. For more information, see the user guide for the network management system.

Viewing alarm information

Use the display alarm command to identify whether an ERROR alarm has occurred. The command output varies by switch model. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display alarm

Slot   CPU   Level   Info                                                       

-      -     ERROR   Power 2 is faulty.                                        

-      -     INFO    Power 3 is absent.                                        

-      -     INFO    Power 4 is absent.                                         

Table 2 Command output

Field	Description
Slot	Slot where the alarm was generated. If the alarm was generated by the frame, this field displays a hyphen (-).
Level	Alarm severity. Possible values include ERROR, WARNING, NOTICE, and INFO, in descending order of severity.
Info	Detailed alarm information: ·     faulty—The device is starting up or is faulty. ·     Board is faulty—The slot is starting or faulty. ·     Fan n is absent—The specified fan is absent. ·     Fan n is faulty—The specified fan is faulty. ·     Power n is absent—The specified power supply is absent. ·     Power n is faulty—The specified power supply is faulty. ·     Slot n temperature is too high, above the shutdown limit—The temperature of the specified card is higher than the shutdown temperature threshold. ·     Slot n temperature is too high, above the high limit—The temperature of the specified card is higher than the high-temperature threshold. ·     Slot n temperature is too high, above the warning limit—The temperature of the specified card is higher than the high-temperature warning threshold. ·     Slot n temperature is too low, below the low limit—The temperature of the specified card is lower than the low-temperature threshold.

 

In daily maintenance, you must handle the ERROR alarms immediately. For alarms that cannot be handled, contact H3C Support.

Viewing log information

Use the display logbuffer command to identify whether an alarm has occurred in the log buffer. For more information about log information, see the configuration guide or system log messages for the switch. The command output varies by switch model. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display logbuffer

Log buffer: Enabled

Max buffer size: 1024

Actual buffer size: 512

Dropped messages: 0

Overwritten messages: 718

Current messages: 512

%Jun 17 15:57:09:578 2016 Sysname SYSLOG/7/SYS_RESTART:System restarted –

...

Table 3 Command output

Field	Description
Log buffer	Status of the log buffer: ·     Enabled—Log messages can be output to the log buffer. ·     Disabled—Log messages cannot be output to the buffer.
Max buffer size	Maximum buffer size supported by the device.
Actual buffer size	Maximum buffer size configured by using the info-center logbuffer size command.
Dropped messages	Number of dropped messages.
Overwritten messages	Number of overwritten messages.
Current messages	Number of current messages.

 

For alarms that cannot be handled, contact H3C Support.

Checking the health status of the device

Use the following commands to view the health status of the device:

·     display cpu-usage

·     display memory

·     display fan

·     display power

·     display environment

Checking the CPU usage of the device

Use the display cpu-usage command to verify that the CPU usage of the device does not exceed 80%. The command output varies by switch model. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display cpu-usage

Slot 1 CPU 0 CPU usage:

       1% in last 5 seconds

       1% in last 1 minute

       1% in last 5 minutes

Table 4 Command output

Field	Description
1% in last 5 seconds	Average CPU usage in the last 5 seconds. (After the device boots, the device calculates and records the average CPU usage at the interval of 5 seconds.)
1% in last 1 minute	Average CPU usage in the last minute. (After the device boots, the device calculates and records the average CPU usage at the interval of 1 minute.)
1% in last 5 minutes	Average CPU usage in the last 5 minutes. (After the device boots, the device calculates and records the average CPU usage at the interval of 5 minutes.)

 

If the CPU usage is too high, wait for 5 to 10 minutes and check the CPU usage again. If the issue persists, contact H3C Support.

Checking the memory usage of the device

Use the display memory command to verify that the free memory ratio of the switch is higher than 20%. (Low memory is not supported. The following command output uses the S12500X-AF switch series as an example.)

<Sysname> display memory

Memory statistics are measured in KB:                                          

Slot 0:                                                                        

             Total      Used      Free    Shared   Buffers    Cached   FreeRatio

Mem:       8149596   2351256   5798340         0        20    275784       71.1%

-/+ Buffers/Cache:   2075452   6074144                                         

Swap:           0         0         0                                          

                                                                               

Slot 1:                                                                        

             Total      Used      Free    Shared   Buffers    Cached   FreeRatio

Mem:       8149596   2180788   5968808         0        20    162472       73.2%

-/+ Buffers/Cache:   2018296   6131300                                         

Swap:           0         0         0                                          

Table 5 Command output

Field	Description
Mem	Memory usage information.
Total	Total size of the physical memory space that can be allocated. The memory space is virtually divided into two parts. Part 1 is used for kernel codes, kernel management, and ISSU functions. Part 2 can be allocated and used for such tasks as running service modules and storing files. The size of part 2 equals the total size minus the size of part 1.
Used	Used physical memory.
Free	Free physical memory.
Shared	Physical memory shared by processes. If this field is not supported, two hyphens (--) are displayed.
Buffers	Physical memory used for buffers. If this field is not supported, two hyphens (--) are displayed.
Cached Caches	Physical memory used for caches. If this field is not supported, two hyphens (--) are displayed.
FreeRatio	Free memory ratio.
-/+ Buffers/Cache	-/+ Buffers/Cache:used = Mem:Used – Mem:Buffers – Mem:Cached, which indicates the physical memory used by applications. -/+ Buffers/Cache:free = Mem:Free + Mem:Buffers + Mem:Cached, which indicates the physical memory available for applications.
Swap	Memory space for swapping.

 

If the free memory ratio is too low for a period of time (typically, 30 minutes), contact H3C Support.

Use the display memory command to verify that the free memory ratio of the switch is higher than 20%. (Low memory is supported. The following command output uses the S5560X-EI switch series as an example.)

<Sysname> display memory

Memory statistics are measured in KB:                                          

Slot 1:                                                                        

             Total      Used      Free    Shared   Buffers    Cached   FreeRatio

Mem:       2036536    496116   1540420         0      1436    113644       75.7%

-/+ Buffers/Cache:    381036   1655500                                         

Swap:            0         0         0                                         

LowMem:    1651512    279856   1371656        --        --        --       83.1%

HighMem:    385024    216260    168764        --        --        --       43.8%

Table 6 Command output

Field	Description
Mem	Memory usage information.
Total	Total size of the physical memory space that can be allocated. The memory space is virtually divided into two parts. Part 1 is used for kernel codes, kernel management, and ISSU functions. Part 2 can be allocated and used for such tasks as running service modules and storing files. The size of part 2 equals the total size minus the size of part 1.
Used	Used physical memory.
Free	Free physical memory.
Shared	Physical memory shared by processes. If this field is not supported, two hyphens (--) are displayed.
Buffers	Physical memory used for buffers. If this field is not supported, two hyphens (--) are displayed.
Cached Caches	Physical memory used for caches. If a memory threshold is reached, part of memory used for caches can be automatically released for other services. If this field is not supported, two hyphens (--) are displayed.
FreeRatio	Free memory ratio. The free memory includes the free physical memory and the part of memory used for caches that can be automatically released for other services when a memory threshold is reached.
-/+ Buffers/Cache	-/+ Buffers/Cache:used = Mem:Used – Mem:Buffers – Mem:Cached, which indicates the physical memory used by applications. -/+ Buffers/Cache:free = Mem:Free + Mem:Buffers + Mem:Cached, which indicates the physical memory available for applications.
Swap	Memory space for swapping
LowMem	Low memory usage information.
HighMem	High memory usage information.

 

If the free memory ratio is too low for a period of time (typically, 30 minutes), contact H3C Support.

Checking the operational status of fan trays

Use the display fan command to verify that all present fan trays are in Normal state. The command output varies by switch model. The following command output uses the S5560X-EI switch series as an example.

<Sysname> display fan

 Slot 1:

 Fan 1:

 State    : Normal

 Airflow Direction: Port-to-power

 Prefer Airflow Direction: Port-to-power

Table 7 Command output

Field	Description
Slot 1	Number of the member device.
Fan 1	Fan tray number.
State	Fan status: ·     Absent—The slot is not installed with a fan tray. ·     Normal—The fan tray is operating correctly. ·     Fault—The fan tray is faulty. ·     FanDirectionFault—The actual airflow direction is not the preferred direction.
Airflow Direction	Actual airflow direction: ·     Port-to-power—From the port side to the power supply side. ·     Power-to-port—From the power supply side to the port side.
Prefer Airflow Direction	Preferred airflow direction: ·     Port-to-power—From the port side to the power supply side. ·     Power-to-port—From the power supply side to the port side.

 

If a fan tray is faulty, troubleshoot and resolve the issues as follows:

1.     Verify that the fan tray is installed securely. If the fan tray is not installed securely, reinstall the fan tray.

2.     Verify that the fan does not have object intrusions. If the fan got stuck, remove the objects.

3.     Verify that the fan tray is clean. If the fan tray has too much dust, clean the fan tray.

4.     If the fan tray still operates incorrectly, replace the fan tray.

5.     If the issue persists, record the failure information immediately and contact H3C Support.

Checking the operational status of power supplies

Use the display power command to verify that all present power supplies are in Normal state when power supply management is not supported. The following command output uses the S5560X-EI switch series as an example.

<Sysname> display power

Slot 1:

PowerID  State    Mode   Current(A)  Voltage(V)  Power(W)                      

 1       Absent   --        --          --          --                         

 2       Normal   AC        0.70       56.44      39.00

Table 8 Command output

Field	Description
PowerID	Power supply ID.
State	Power supply status: ·     Absent—The slot is not installed with a power supply. ·     Normal—The power supply is operating correctly. ·     Fault—The power supply is faulty.
Mode	Mode of the power supply: ·     AC—AC power supply. ·     DC—DC power supply.
Current(A)	Output current of the power supply, in amperes. This field is not supported by the device models that use built-in power supplies and displays two hyphens (--).
Voltage(V)	Output voltage of the power supply, in volts. This field is not supported by the device models that use built-in power supplies and displays two hyphens (--).
Power(W)	Output power of the power supply, in watts. This field is not supported by the device models that use built-in power supplies and displays two hyphens (--).

 

If a power supply is faulty, perform the following tasks:

1.     Verify that the power supply is powered on.

2.     Verify that the power cord is connected securely.

3.     If the power supply still operates incorrectly, replace the power supply.

4.     If the issue persists, record the failure information immediately and contact H3C Support.

Use the display power command to verify that all present power supplies are in Normal state when power supply management is supported. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display power

 Power supply policy     : Enabled                                             

 Surplus sleeping        : Disabled                                            

 Power modules installed : 2                                                    

 Power modules usable    : 2                                                   

 Total power             : 4000W                                               

 Redundant power         : 0W                                                   

 Sleeping power          : 0W                                                  

 Available power         : 4000W                                               

   Allocated power       : 2375W                                               

   Remaining power       : 1625W                                               

                                                                               

 PowerID State     InPower(W)  Current(A)  Voltage(V)  OutPower(W)     Type    

  1      Normal      2000        5.80       54.00       313.20     CP2000AC    

  2      Absent       --          --          --           --          ---     

  3      Normal      2000        4.40       54.00       237.60     CP2000AC    

  4      Absent       --          --          --           --          ---     

  5      Absent       --          --          --           --          ---     

  6      Absent       --          --          --           --          ---     

  7      Absent       --          --          --           --          ---     

  8      Absent       --          --          --           --          ---     

                                                                                

 Information about reserved power:                                             

                                                                               

  Slot  Status  Power(W)   Remarks                                              

   7    Normal    275      Powered on                                          

  10    Normal    170      Powered on                                          

  11    Fault     450      Powered on                                           

  12    Normal    170      Powered on                                          

  16    Normal     50      Reserved for MPU                                    

  17    Absent     50      Reserved for MPU                                    

                                                                                

 Power information for fans:                                                   

  Fan[2]: 1200W                                                                

Table 9 Output description

Field	Description
Power supply policy	Status of power supply management: ·     Enabled. ·     Disabled.
Surplus sleeping	Status of the surplus sleeping feature: ·     Enabled. ·     Disabled.
Power modules installed	Number of power supplies installed on the device.
Power modules usable	Number of used power supplies. The used power supplies are the power supplies in Normal and Sleeping states.
Total power	Total power, in watts.
Redundant power	Redundant power, in watts.
Sleeping power	Sleeping power, in watts.
Available power	Available power, in watts.
Allocated power	Used power, in watts.
Remaining power	Remaining power, in watts.
PowerID	Power supply ID.
State	Power supply status: ·     Absent—The slot is not installed with a power supply. ·     Normal—The power supply is operating correctly. ·     Fault—The power supply is faulty. ·     Sleeping—The power supply is sleeping.
InPower(W)	Input power of the power supply, in watts. If this field is not supported, two hyphens (--) are displayed.
Current(A)	Output current of the card, in amperes. If this field is not supported, two hyphens (--) are displayed.
Voltage(V)	Output voltage of the card, in volts. If this field is not supported, two hyphens (--) are displayed.
OutPower(W)	Output power of the power supply, in watts. If this field is not supported, two hyphens (--) are displayed.
Type	Power supply model. If this field is not supported, two hyphens (--) are displayed.
Information about reserved power	Information about reserved power on cards.
Slot	Slot number of the card.
Status	Status of the card: ·     Absent—The slot is not installed with a card. ·     Normal—The card is operating correctly. ·     Fault—The card is faulty or does not start up.
Power(W)	Reserved power on the card, in watts.
Remarks	Description of the reserved power: ·     Reserved for MPU. ·     Powered on—The card is powered on. ·     Not enough power to power it on—Reserved power is not enough for the card to be powered on. ·     Reserved for a non-MPU card. ·     Powered off—The card is powered off forcibly.
Power information for fans	Information about the reserved power for fans.
Fan[x]	Fan number.

 

If a power supply is faulty, perform the following tasks:

1.     Verify that the power supply is powered on.

2.     Verify that the power cord is connected securely

3.     Replace the power supply.

4.     If the issue persists, record the failure information immediately and contact H3C Support.

Checking information about temperature sensors on the device

Use the display environment command to verify that the temperatures of temperature sensors on the device are in a normal range. The command output varies by switch model. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display environment

 System temperature information (degree centigrade):

 -----------------------------------------------------------------------------

 Slot  Sensor       Temperature  Lower       Warning       Alarm       Shutdown

 1     hotspot 1    38           10          40            50          100

 1     hotspot 2    42           10          50            80          100

Table 10 Command output

Field	Description
System Temperature information (degree centigrade)	Temperature information (°C).
sensor	Temperature sensor: ·     hotspot—Hotspot sensor. ·     inflow—Air inlet sensor.
Slot	Sensor position.
Temperature	Current temperature.
Lower	Lower temperature limit. If the device does not support this field, this field displays NA.
Warning	Warning temperature threshold. If the device does not support this field, this field displays NA.
Alarm	Alarming temperature threshold. If the device does not support this field, this field displays NA.
Shutdown	Shutdown temperature threshold. When the sensor temperature exceeds the limit, the system shuts down automatically. If the device does not support this field, this field displays NA.

 

If an exception has occurred, perform the following tasks:

1.     Verify that the temperature in the equipment room is normal.

2.     Verify that the device ventilation aisles are not obstructed.

3.     Verify that the fan trays are operating correctly.

4.     If the issue persists, record the failure information immediately and contact H3C Support.

Checking the operational status of cards and subcards

Use the display device command to verify that the present cards and subcards are in Normal state. The command output varies by switch model. The following command output uses the S12500X-AF switch series as an example.

<Sysname> display device

Slot Type             State    Subslot  Soft Ver             Patch Ver

0    LSXM1SUPB1       Master   0        S12508X-AF-0502      None

1    LSXM1SUPB1       Standby  0        S12508X-AF-0502      None

2    NONE             Absent   0        NONE                 None

3    LSXM1TGS48C2HB1  Normal   0        S12508X-AF-0502      None

4    NONE             Absent   0        NONE                 None

5    NONE             Absent   0        NONE                 None

6    NONE             Absent   0        NONE                 None

7    NONE             Absent   0        NONE                 None

8    NONE             Absent   0        NONE                 None

9    NONE             Absent   0        NONE                 None

10   NONE             Absent   0        NONE                 None

11   NONE             Absent   0        NONE                 None

12   NONE             Absent   0        NONE                 None

13   NONE             Absent   0        NONE                 None

14   NONE             Absent   0        NONE                 None

15   LSXM1SFH08D1     Normal   0        S12508X-AF-0502      None

Table 11 Command output

Field	Description
Type	Hardware type of the card.
Status	Card status: ·     Standby—The card is the standby MPU. ·     Master—The card is the active MPU. ·     Absent—The slot is not installed with a card. ·     Fault—The card is starting up, powered off, or faulty. ·     Normal—The card is an interface card and is operating correctly. ·     Offline—The card is isolated.
Soft Ver	Software version of the card.
Patch Ver	Most recently released patch image version that is running on the card. If no patch image is installed, this field displays None. If both incremental and non-incremental patch images are running on the card, this field displays the most recently released incremental patch image version.

 

If an exception has occurred, reinstall the card or subcard. If the issue persists, record the failure information immediately and contact H3C Support.

Collecting and reporting failure information

For the support for the commands in this section, see the command reference for the switch.

If an exception has occurred, first record the following failure information immediately and then report them to H3C Support:

·     Symptom, time of failure, and configuration.

·     Network topology information, including the network diagram, port connections, and points of failure.

·     Log messages and diagnostic information.

·     Steps you have taken and the result.

Collecting basic failure information

Table 12 shows the basic failure information to be collected if the device is faulty.

Table 12 Basic failure information

Item	Collection method
Time of failure	Record the time when the failure occurred down to the minute.
Symptom	Record detailed symptom of the failure.
Impact	Record the failure severity and affected services.
Networking	Draw a network diagram, including uplink and downlink devices and connected interfaces.
Steps you have taken	Record the steps you have taken and the results, including output from the commands executed during the troubleshooting process.

 

Collecting log information

Log information records daily information, user actions, system failures, system safety, and system debugging. It includes diagnosis monitoring log messages, diagnostic log messages, system log messages, and debug log messages.

To obtain the most recent log information, save the collected log messages to a log file.

To collect log information:

1.     Save diagnostic log messages from the log buffer to a log file.

diagnostic-logfile save

By default, diagnostic log files are saved in the flash:/diagfile directory of the storage device.

2.     Save system log messages from the log buffer to a log file.

logfile save

By default, system log files are saved in the flash:/logfile directory of the storage device.

3.     Execute the dir command in user view to verify that the log files are generated correctly.

4.     Transfer the log files to the desired destination by using FTP, TFTP, or SFTP. For more information, see the configuration guide for the switch.

Collecting diagnostic information

To collect all diagnostic information for the device, including boot configuration, current configuration, interface information, time, and system version, execute the display diagnostic-information command.

To shorten the time used for collecting diagnostic information when the device has many configurations or a long operation time, execute the display diagnostic-information key-info command to collect only key diagnostic information. Before executing the display diagnostic-information command, use the display cpu-usage and display memory commands to view the CPU usage and memory usage, respectively. If the CPU or memory usage is too high, do not execute the display diagnostic-information command until the CPU or memory usage drops below the threshold.

To collect diagnostic information:

1.     Display diagnostic information for the device.

¡     Display all diagnostic information for the device.

<Sysname> display diagnostic-information

Save or display diagnostic information (Y=save, N=display)? [Y/N]:n

===============================================

  ===============display clock===============

14:03:55 UTC Thu 01/05/2021

=================================================

  ===============display version===============

...

¡     Display key diagnostic information for the device.

<Sysname> display diagnostic-information key-info

Save or display diagnostic information (Y=save, N=display)? [Y/N]:n

===============================================

  ===============display clock===============

15:03:55 UTC Thu 01/05/2021

=================================================

  ===============display version===============

...

2.     Save diagnostic information to a diagnostic log file.

¡     Save all diagnostic information to a diagnostic log file.

<Sysname> display diagnostic-information

Save or display diagnostic information (Y=save, N=display)? [Y/N]:y

Please input the file name(*.tar.gz)[flash:/diag_Sysname_20211020-194410.tar.gz]:

Diagnostic information is outputting to flash:/diag_Sysname_20211020-194410.tar.gz.

Please wait...

Save successfully.

¡     Save key diagnostic information to a diagnostic log file.

<Sysname> display diagnostic-information key-info

Save or display diagnostic information (Y=save, N=display)? [Y/N]:y

Please input the file name(*.tar.gz)[flash:/diag_Sysname_20211020-194412.tar.gz]:

Diagnostic information is outputting to flash:/diag_Sysname_20211020-194412.tar.gz.

Please wait...

Save successfully.

By default, diagnostic log files are saved in the flash:/ directory of the storage device.

3.     Execute the dir command in user view to verify that the diagnostic file is generated correctly.

4.     Transfer the diagnostic file to the desired destination by using FTP, TFTP, or SFTP. For more information, see the configuration guide for the switch.

Troubleshooting login failure

CAUTION: Make sure all user services have stopped before performing the following tasks. If user services are not interrupted, collect the failure information and contact H3C Support.

 

If you cannot log in to the device through Telnet or SSH, log in from the console port and modify Telnet or SSH settings. If you cannot log in to the device from the console port, use this section to troubleshoot the issue.

Checking for power supply system failure

Symptom

The LEDs on the device or cards are off and the fans on the device or cards do not operate (determined by the sound).

Solution

To resolve the issue:

1.     Verify that the power supply is powered on. If the device is installed with multiple power supplies, make sure the power supply that ensures device operation is powered on.

2.     Verify that the LED that indicates a normal operating state for the power supply is on. See "Checking the LED status." If the power supply is faulty, it might have issues such as output short-circuit, output overcurrent, output overvoltage, input undervoltage, and overtemperature.

3.     If the power supply has an input exception, contact electricians to examine and repair the power supply system for the equipment room, rack, or cabinet. If the power supply is faulty, replace the power supply.

4.     If the issue persists, contact H3C Support.

Checking for inconsistent serial communication parameter settings between the configuration terminal and the console port

Symptom

Serial communication parameter settings between the configuration terminal and the console port are inconsistent.

Solution

To resolve the issue, edit the serial communication parameter settings for the serial port on the terminal.

By default, the communication parameter settings for the console port on the device are as follows:

·     Baud rate—9600.

·     Data bits—8.

·     Stop bits—1.

·     Parity—None.

·     Flow control—None.

If the communication parameter settings for the console port on the device have been changed, use the most recent settings.

Checking for MPU failure (on modular devices)

Symptom

The RUN LED for the MPU is off.

Solution

To resolve the issue:

1.     Reinstall the MPU and fasten the screws to make sure the MPU is installed securely.

2.     Press the RESET button, the rightmost button on the MPU, to reboot the MPU.

3.     If the device has an empty MPU slot, install the MPU in the empty slot and check its operational status.

4.     Replace the MPU.

Resetting the device

Power off the device and then power on the device after three minutes.

Contacting H3C Support

If the issue persists, contact H3C Support.

Safety and configuration cautions and guidelines

This section describes important information that if not understood or followed can result in undesirable situations, including bodily injury, device damage, service interruption, or service anomalies. It contains hardware safety guidelines and CLI-based configuration cautions and guidelines. Before you work on or configure your device, read the information in this section carefully.

Hardware safety guidelines

Only trained and qualified personnel are allowed to perform the operations described in this guide. For more information, see H3C Switches Safety & Configuration Cautions and Guidelines.

Table 13 Hardware safety guidelines for fixed-port switches

Category	Guidelines
Handling expansion modules	Do not install or remove an expansion module during startup of the device.
Handling transceiver modules	Do not stare into any open apertures of operating transceiver modules or optical fiber connectors.
Handling cables	Network cables are used for the communication between the device and the maintenance terminal. Network cable connection or disconnection can be performed only by qualified maintenance personnel for service adjustment as scheduled and they must be aware of the impact on the network.
Handling fan trays	Do not install fan trays of different models on the same device.
	Do not hot swap fan trays.
	Do not power on the device when the device is not installed with all fan trays.
	Do not touch the rotating fans when replacing a fan tray.
Handling power supplies	Do not hot swap power supplies.
	Operate the power switches on the PDUs in the cabinet only when upgrading or expanding the device, replacing the components in the device, or when a severe system failure occurs.

 

Table 14 Hardware safety guidelines for modular switches

Category	Guidelines
Handling cards	Keep a filler panel in the unused slot.
	When the device is operating, remove the active MPU only when both MPUs are operating stably. To view system stability and status information, execute the display system stable state command.
	Pressing the RESET button on an MPU will reset the MPU forcibly. This operation can be performed only by qualified maintenance personnel when a severe system failure occurs.
	Pressing the OFL button on a fabric module will isolate the services on the module. This operation can be performed only by qualified maintenance personnel before powering off a fabric module.
Handling transceiver modules	Do not stare into any open apertures of operating transceiver modules or optical fiber connectors
Handling cables	Network cables are used for the communication between the device and the maintenance terminal. Network cable connection or disconnection can be performed only by qualified maintenance personnel for service adjustment as scheduled and they must be aware of the impact on the network.
Handling fan trays	Do not hot swap fan trays.
	Do not power on the device when the device is not installed with all fan trays.
	Do not touch the rotating fans when replacing a fan tray.
Handling power supplies	Do not hot swap power supplies.
	Operate the power switches on the PDUs in the cabinet only when upgrading or expanding the device, replacing the components in the device, or when a severe system failure occurs.
	For devices that have two power switches, to power off the device for maintenance, make sure the two power switches are both turned off.

 

CLI-based configuration cautions and guidelines

Only trained and qualified personnel are allowed to do the configuration tasks described in this guide. For more information, see H3C Switches Safety & Configuration Cautions and Guidelines.

Table 15 CLI-based configuration cautions and guidelines

Feature	Command	Description	Usage guidelines
File system management	delete [ /unreserved ] file	Deletes a file.	The delete /unreserved file command deletes a file permanently. The file cannot be restored. The delete file command (without /unreserved) moves a file to the recycle bin unless it is executed on the default MDC to delete a file from a non-default MDC.
File system management	format	Formats a file system.	Formatting a file system permanently deletes all files in the file system. If a startup configuration file exists in the file system, back up the file if necessary.
Device management	power-supply off	Powers off a card.	Use this command with caution. A card cannot send or receive packets after this command is executed.
Device management	reboot	Reboots the device.	A reboot might interrupt network services. Use the force keyword only when the device fails or a reboot command without the force keyword cannot perform a reboot correctly. A reboot command with the force keyword might result in file system corruption, because it does not perform data protection.
Common interface settings	shutdown	Shuts down an interface.	Use this command with caution. This command disables the interface from forwarding or receiving traffic.
Common interface settings	default	Restores the default settings for an interface.	The default command might interrupt ongoing network services. Use this command with caution.