What is hot-standby backup of WLAN devices

In hot-standby backup mode, one AC acts as the master AC and the other acts as the backup AC. The master AC forwards services and the backup AC monitors data forwarding. The master AC also periodically sends status information and information that needs to be backed up to the backup AC. If the master AC becomes faulty, the backup AC takes over services.
On a WLAN, an AC can manage several hundreds of APs. If an AC is faulty, services on all APs associated with the AC are interrupted. Therefore, AC reliability is vital to network availability.
Two hot-standby backup modes are available: HSB+VRRP and HSB+dual-link backup
HSB+VRRP and HSB+dual-link backup can improve network availability. HSB supports batch backup and real-time backup between two access devices. Before link switching, the standby AC synchronizes information from the active AC. When the active AC fails, service traffic is immediately switched to the standby AC without interrupting services. This improves connection reliability. Dual-link backup or VRRP can rapidly detect whether the active AC is faulty so that the standby AC can change to active state quickly. This function ensures user service continuity.
Pay attention to the following points when deploying hot-standby backup on ACs:
- Hot-standby backup supports only backup between two ACs, and the models and software versions of the ACs must be the same.
- WLAN service configurations (for example, WMM profile, radio profile, radio, traffic profile, security profile, and WLAN ID) of the AP connected to the active and standby ACs must be consistent on the two ACs; otherwise, the AP cannot work properly after an active/standby AC switchover.

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