(Optional) Configuring the Active/Standby Link Switchover Mode

Context

In dual-link cold backup or hot standby scenarios, an AP simultaneously sets up active and standby links with active and standby ACs, respectively. If the active link is faulty, the AP switches service traffic to the standby link and goes online on the standby AC. When the active link recovers, the AP detects that this link has a higher priority than the other one and triggers a revertive switchover. After 20 Echo intervals, the AP switches service traffic back to the active AC.

To enable an AP to preferentially switch service traffic to the active link, set the active/standby link switchover mode to the priority mode.
To allow an AP to use a link with high network stabilization, set the active/standby link switchover mode to the network stabilization mode. When the condition for triggering an active/standby link switchover is met, the AP preferentially switches service traffic to the link on a network with higher stabilization. In this case, whether an active/standby link switchover is performed is only related to the network stabilization of links but not related to the active and standby roles of links. You can run the ac protect link-switch packet-loss { gap-threshold gap-threshold | start-threshold start-threshold } command to configure the condition for triggering an active/standby link switchover.

In dual-link cold backup and hot standby scenarios, the network stabilization of active and standby links is determined based on the Echo packet loss rate. The active/standby link switchover is performed when the following conditions are met:

APs collect statistics about the specified number of Echo packets forwarded through the link in use at each interval and find that the calculated packet loss rate is higher than the packet loss rate start threshold.
The packet loss rate of the link in use is higher than that of the other link, and the difference between the two links' packet loss rates is higher than the packet loss rate difference threshold.

Procedure

Run system-view
The system view is displayed.
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.

By default, the system provides the AP system profile default.
Run ac protect link-switch mode { priority | network-stabilization }
The active/standby link switchover mode is configured.

By default, the active/standby link switchover mode is the priority mode.
Run ac protect link-switch packet-loss echo-probe-time echo-probe-time
The number of Echo probe packets sent within a statistics collection interval is configured.

By default, the number of Echo packets sent within a statistics collection interval is 20.

This configuration is supported only when the active/standby link switchover mode is set to the network stabilization mode using the ac protect link-switch mode network-stabilization command.
Run ac protect link-switch packet-loss { gap-threshold gap-threshold | start-threshold start-threshold }
The packet loss rate start and difference thresholds for an active/standby link switchover are configured.

By default, the packet loss rate start and difference thresholds for an active/standby link switchover are 20% and 15%, respectively.

This configuration is supported only when the active/standby link switchover mode is set to the network stabilization mode using the ac protect link-switch mode network-stabilization command.
Run quit
Return to the WLAN view.
Bind the AP system profile to the 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.

Verifying the Configuration

Run the display ap-system-profile { all | name profile-name } command to check the configurations related to the active/standby link switchover mode.