Dual-Link HSB Fails

Symptom

In a dual-link HSB scenario, the link between the active and standby ACs is disconnected.

Possible Causes

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

Procedure

1. Check whether the HSB channel between the active and standby ACs is normal.

   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 indicates that the link is normal, and Disconnected indicates that the link is disconnected. You need to check the link and restore it to the 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 the next step.
   • 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 by referring to step 1.

   For AP information backup, the ACs must be bound to the AP module. For STA information backup, the ACs must be bound to the access-user module.

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

3. Collect related information and contact technical support personnel.

   Run the following commands to collect device information.

   Command	Function
   <AC> display hsb statistics hsb-group 0 event <AC> display hsb statistics hsb-service 0 event	Displays the user view, collects HSB event information, and collects information displayed on the console.
   <AC> display hsb statistics hsb-service 0 packet	Displays the user view, collects HSB packet information, and collects information displayed on the console.
   [AC-diagnose] display wlan debuginfo type 1 from 0 to 1000	Displays the user view, collects WDEV logs, and collects information displayed on the console.
   [AC-diagnose] display wlan debuginfo type 8 from 0 to 1000	Displays the user view, collects WSRV logs, and collects information displayed on the console.
   <AC> save logfile	Saves diagnostic logs.
   [AC-diagnose] info-center create logbook xx.xml	Creates a dictionary file of diagnostic logs.
   [AC-diagnose] display wlan wsrv backup elmt 1000	Displays backup processing information on a specified module in the diagnostic view, including serialization, deserialization, and processing statistics.