What is hot-standby backup of WLAN devices

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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.

Other related questions:
Do WLAN devices support hot-standby backup
ACs support hot-standby backup. Two hot-standby backup modes are available: HSB+VRRP and HSB+dual-link backup. HSB+VRRP backup implements traffic switching through VRRP, while HSB+dual-link backup implements traffic switching through dual links. Hot-standby backup achieves service backup of two ACs. HSB+VRRP applies only to the active/standby mode, whereas HSB+dual-link backup applies to both the active/standby and load balancing modes.

Two-node cluster hot backup of a WLAN device fails
Two-node cluster hot backup modes include HSB+VRRP and HSB+dual-link. HSB+VRRP hot backup implements traffic switching through VRRP, and HSB+dual-link hot backup implements traffic switching through dual links. - For details on troubleshooting of HSB+VRRP hot backup faults, see: VRRP HSB Fails. - For details on troubleshooting of HSB+dual-link hot backup faults, see: HSB Between Two Links Fails.

What are precautions for deploying the WLAN hot standby plan
Currently, Huawei products support dual link hot standby. When dual link hot standby is deployed, the interval at which heartbeat packets are transmitted must be the same on the active and standby ACs, no AC can function as a service gateway, service configurations must be the same on the active and standby ACs, and the active and standby ACs must use different IP address pools.

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