Troubleshooting: HSB Between Two Links Becomes Ineffective

Common Causes

Common causes are as follows:

• The link between active and standby ACs does not work properly.
• The HSB service is not configured.

Troubleshooting Flowchart

Troubleshooting Procedure (Web NMS)

1. Check whether the HSB channel between the two ACs works properly.

   On the active AC, check whether the link between the active and standby ACs is normal.

   Choose Configuration > Backup Settings > Backup Settings > Backup Configuration > Dual-link hot backup and check whether the HSB channel is normal.

   • If the link between the active and standby ACs is normal, go to step 2.
   • If the link between the active and standby ACs does not work properly, check the HSB channel configuration. Ensure that the HSB channel configuration is correct.

2. Check whether the HSB service is correctly configured on the active and standby ACs according to step 1.

   To back up AP information, the ACs must be bound to the AP module. To back up STA information, the ACs must be bound to the access-user module.

   • If the HSB service is correctly configured, go to step 3.
   • If the HSB service is not configured, configure the HSB service.

3. Collect the following information and contact Huawei technical support personnel.

   The log file can be exported through the web NMS. For details about diagnosis commands or file operations, see the following section.

   Choose Maintenance > Log >View AC Logs > Export and export AC logs.

Troubleshooting Procedure (CLI)

1. Check whether the HSB channel between the two ACs works properly.

   On the active AC, check whether the link between the active and standby ACs is normal.

   Run the display hsb-service 0 command to check whether the link status is Connected:

   • Connected: The link is normal.
   • Disconnected: The link is terminated.

   Check the link and ensure that the link is in Connected state.

   [AC20] display hsb-service 0
   Hot Standby Service Information:
   ----------------------------------------------------------
     Local IP Address       : 10.1.1.1
     Peer IP Address        : 10.1.1.2
     Source Port            : 10241
     Destination Port       : 10242
     Keep Alive Times       : 5
     Keep Alive Interval    : 2
     Service State          : Connected
     Service Batch Modules  :
   ----------------------------------------------------------

   • If the link between the active and standby ACs is normal, go to step 2.
   • If the link between the active and standby ACs does not work properly, check the HSB channel configuration. Ensure that the HSB channel configuration is correct.

2. Check whether the HSB service is correctly configured on the active and standby ACs according to step 1.

   To back up AP information, the ACs must be bound to the AP module. To back up STA information, the ACs must be bound to the access-user module.

   • If the HSB service is correctly configured, go to step 3.
   • If the HSB service is not configured, configure the HSB service.

3. Collect the following information and contact Huawei technical support personnel.

   Run the following commands to collect device information.

   Command	Function
   <AC6605> display hsb statistics hsb-group 0 event <AC6605> display hsb statistics hsb-service 0 event	Enter the user view and collect HSB events.
   <AC6605> display hsb statistics hsb-service 0 packet	Enter the user view and collect HSB packets.
   [AC6605-diagnose] display wlan debuginfo type 1 from 0 to 1000	Enter the user view and collect WDEV logs.
   [AC6605-diagnose] display wlan debuginfo type 8 from 0 to 1000	Enter the user view and collect WSRV logs.
   <AC6605> save logfile	Save diagnosis logs.
   [AC6605-diagnose] info-center create logbook xx.xml	Create a dictionary file of diagnosis logs.
   [AC6605-diagnose] display wlan wsrv backup elmt 1000	Display backup processing information about a specified module in the diagnostic view, including serialization, deserialization, and processing statistics.