Configuring AC Roles (Traditional Method 2)

Context

N+1 backup uses one standby AC to back up multiple active ACs. An AP determines AC roles based on AC priorities. It selects the AC with a higher priority as the active AC and the AC with a lower priority as the standby AC. The AP sets up a connection with the AC of the specified IP address.

An AP may discover more than two ACs. In this case, if you only configure a global priority for each AC, the AP selects the AC with the highest global priority as the active AC, and therefore may select an incorrect active AC.

To ensure that the AP connects to the predefined active AC or standby AC, configure both the global priority and individual priority on the active AC, and configure only the global priority on the standby AC. Ensure that the ACs' priorities meet the following requirements: active AC's individual priority > standby AC's global priority > active AC's global priority.

If a global priority and an individual priority are both configured for an AP on the AC, the AC preferentially delivers the individual priority to the AP.

Procedure

Configure the active AC.
Perform the following configurations on the active AC:
1. Run system-view
  The system view is displayed.
2. Run wlan
  The WLAN view is displayed.
3. Run ac protect protect-ac ip-address
  The standby AC's IP address is configured in the WLAN view.
  
  By default, no standby AC IP address is configured in the WLAN view.
4. Run ac protect priority priority
  The global priority of the active AC is configured in the WLAN view.
  
  By default, the AC priority in the WLAN view is 0.
  
  Ensure that the ACs' priorities meet the following requirements: active AC's individual priority > standby AC's global priority > active AC's global priority.
  
  A smaller priority value indicates a higher priority.
5. Run ap-system-profile name profile-name
  An AP system profile is created and the AP system profile view is displayed.
  
  By default, the system provides the AP system profile default.
6. Run priority priority-level
  The individual priority of the AC is configured in the AP system profile.
  
  By default, no AC priority is configured in the AP system profile view.
  
  Ensure that the ACs' priorities meet the following requirements: active AC's individual priority > standby AC's global priority > active AC's global priority.
  
  After you configure the AC's individual priority in the AP system profile, bind the AP system profile to an AP group.
7. Run quit
  Return to the WLAN view.
8. The AP system profile is bound to an AP group.
  - Binding an AP system profile to an AP group.
    1. Run the ap-group name group-name command to enter the AP group view.
    2. Run the ap-system-profile profile-name command to bind the AP system profile to the AP group.
      
      By default, the AP system profile default is bound to an AP group.
  - Binding an AP system profile to an AP.
    1. Run the ap-id ap-id, ap-mac ap-mac, or ap-name ap-name command to enter the AP view.
    2. Run the ap-system-profile profile-name command to bind the AP system profile to the AP.
      
      By default, no AP system profile is bound to an AP.
Configure the standby AC.
Perform the following configurations on the standby AC:
1. Run system-view
  The system view is displayed.
2. Run wlan
  The WLAN view is displayed.
3. Run ac protect priority priority
  The global priority of the standby AC is configured.
  
  By default, the AC priority in the WLAN view is 0.
  
  Ensure that the ACs' priorities meet the following requirements: active AC's individual priority > standby AC's global priority > active AC's global priority.
4. Run ap-system-profile name profile-name
  An AP system profile is created and the AP system profile view is displayed.
  
  By default, the system provides the AP system profile default.
5. Run protect-ac ip-address ip-address
  The active AC's IP address is configured in the AP system profile view.
  
  By default, no standby AC's IP address is configured in the AP system profile view.
  
  If multiple APs have the same active AC, configure the active AC's IP address for the APs on the standby AC in the AP system profile, and bind the AP system profile to an AP group.
6. Run quit
  Return to the WLAN view.
7. The AP system profile is bound to an AP group.
  - Binding an AP system profile to an AP group.
    1. Run the ap-group name group-name command to enter the AP group view.
    2. Run the ap-system-profile profile-name command to bind the AP system profile to the AP group.
      
      By default, the AP system profile default is bound to an AP group.
  - Binding an AP system profile to an AP.
    1. Run the ap-id ap-id, ap-mac ap-mac, or ap-name ap-name command to enter the AP view.
    2. Run the ap-system-profile profile-name command to bind the AP system profile to the AP.
      
      By default, no AP system profile is bound to an AP.