Configuring Dual-Link Cold Backup (New Method)

Context

Traditionally, dual-link cold backup is configured by specifying IP addresses of the active and standby ACs on each other and configuring AC priorities. The active and standby ACs are then determined based on the priority. To simplify configuration logic, the new configuration method allows you to specify the same primary and backup ACs for APs on the active and standby ACs. The active AC is specified as the primary AC, and the standby AC as the backup AC.

The following configurations must be performed on both the active and standby ACs.

You cannot configure dual-link cold backup in both the traditional and new methods. Otherwise, the dual-link cold backup function cannot take effect.

Pre-configuration Tasks

Before configuring dual-link cold backup, configure basic WLAN services on the active and standby ACs (For details, see WLAN Service Configuration Guide).

Procedure

Run system-view
The system view is displayed.
(Optional) Run capwap echo { interval interval-value | times times-value } ^*
The CAPWAP heartbeat interval and number of CAPWAP heartbeat detections are configured.

By default, the CAPWAP heartbeat detection interval is 25s and the number of CAPWAP heartbeat detections is 6.

By default, If dual-link backup is enabled, the CAPWAP heartbeat detection interval is 25s and the number of CAPWAP heartbeat detections is 3.
- To configure dual-link backup on a WDS or mesh network, set the CAPWAP heartbeat interval to 25 seconds and set the number of heartbeat packet transmissions to at least 6. If this configuration is not performed, the AC sends heartbeat packets 3 times at an interval of 25 seconds by default. This may cause unstable WDS or mesh link status and result in user access failures.
- If you set the CAPWAP heartbeat detection interval and the number of CAPWAP heartbeat detections smaller than the default values, the CAPWAP link reliability is degraded. Exercise caution when you set the values. The default values are recommended.
Run wlan
The WLAN view is displayed.
Run ap-system-profile name profile-name
An AP system profile is created and the AP system profile view is displayed.
Run primary-access { ip-address ip-address | ipv6-address ipv6-address }
A primary AC IP address is configured.

By default, no primary AC IP address is configured.
Run backup-access { ip-address ip-address | ipv6-address ipv6-address }
A backup AC IP address is configured.

By default, no backup AC IP address is configured.
Run quit
Return to the WLAN view.
Run undo ac protect restore disable
Revertive switching is enabled.
(Optional) Run ac protect cold-backup kickoff-station
STAs using open system authentication are configured to disconnect from APs when an active/standby AC switchover is implemented.
(Optional) Run ac protect alarm-restrain enable
AP Fault alarm suppression is enabled.

By default, AP Fault alarm suppression is disabled.
Run ac protect enable
By default, dual-link backup is disabled.
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.
Run quit
Return to the WLAN view.
Run ap-reset { all | ap-name ap-name | ap-mac ap-mac | ap-id ap-id | ap-group ap-group | ap-type { type type-name | type-id type-id } }
APs are restarted to make the dual-link backup configurations take effect.
- If the dual-link backup function is disabled, running the ac protect enable command restarts online APs. After the APs are restarted, the dual-link backup function takes effect.
- If the dual-link backup function is enabled, running the ac protect enable command does not restart online APs. You need to run the ap-reset { all | ap-name ap-name | ap-mac ap-mac | ap-id ap-id | ap-group ap-group | ap-type { type type-name | type-id type-id } } command to restart the APs and make the dual-link backup function take effect. You can also manually restart the APs to make the dual-link backup function take effect.
- If an AP goes online after dual-link backup is configured, you do not need to restart the AP.

Verifying the Configuration

Run the display ac protect command to check the dual-link backup status, active/standby AC switch back status, as well as AC priority and the standby AC's IP address in the WLAN view.
Run the display ap-system-profile { all | name profile-name } command to check the AC priority and the standby AC's IP address in the AP system profile view.