Two-node cluster hot backup of a WLAN device fails

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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.

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Example of configuring VRRP active/standby backup on an AR router
The roadmap of configuring VRRP active/standby backup on an AR router to implement gateway redundancy is as follows: 1. Configure IP addresses and routing protocols for different device interfaces to enable network-layer connection among different devices. 2. Configure a VRRP group on Router A and Router B, respectively. Configure a high priority and set preemption delay to 20s on Router A and configure Router A as a master device to bear and forward traffic. Configure a low priority and configure Router B as a backup device to implement gateway redundancy. Configure a VRRP group. # Create VRRP 1 on Router A, set its priority to 120, and set the preemption delay to 20s. [RouterA] interface gigabitethernet 2/0/0 [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 virtual-ip 10.1.1.111 //Configure a virtual IP address. [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 priority 120 //Set priority to 120. [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 preempt-mode timer delay 20 //Set the preemption delay to 20s. [RouterA-GigabitEthernet2/0/0] quit # Create VRRP 1 on Router B, and set its priority to a default value 100. [RouterB] interface gigabitethernet 2/0/0 [RouterB-GigabitEthernet2/0/0] vrrp vrid 1 virtual-ip 10.1.1.111 [RouterB-GigabitEthernet2/0/0] quit For details about the configuration, see the URL: Example for Configuring a VRRP Group in Active/Standby Mode.

Method used to configure interworking between BFD Sessions and the two-node cluster hot backup on the USG firewall
The VGMP management group is the core of the two-node cluster hot backup. It determines the active/standby state of a device. By means of interworking between BFD sessions and the two-node cluster hot backup, the VGMP management group monitors static BFD sessions, and the priority of the VGMP management group varies depending on the BFD session state. In this way, the active/standby switchover between devices is triggered. This case describes key configuration for the interworking between BFD sessions and the two-node cluster hot backup using active/standby two-node cluster hot backup as an example. 1. Establish the two-node cluster hot backup on two devices. 2. On USG_A and Router_A, create BFD sessions. # On USG_A, configure BFD session 1, and set the peer IP address to 1.1.1.2, local identifier to 10, and remote identifier to 20. HRP_A[USG_A] bfd HRP_A[USG_A-bfd] quit HRP_A[USG_A] bfd 1 bind peer-ip 1.1.1.2 HRP_A[USG_A-bfd-session-1] discriminator local 10 HRP_A[USG_A-bfd-session-1] discriminator remote 20 HRP_A[USG_A-bfd-session-1] commit HRP_A[USG_A-bfd-session-1] quit # On Router_A, configure BFD session 1, and set the peer IP address to 10.100.30.2, local identifier to 20, and remote identifier to 10. 3. On USG_A, configure the interworking between BFD sessions and the two-node cluster hot backup. HRP_A[USG_A] hrp track bfd-session 10 master 4. On USG_B and Router_B, create BFD sessions. # On USG_B, configure BFD session 1, and set the peer IP address to 2.2.2.2, local identifier to 10, and remote identifier to 20. HRP_S[USG_B] bfd HRP_S[USG_B-bfd] quit HRP_S[USG_B] bfd 1 bind peer-ip 2.2.2.2 HRP_S[USG_B-bfd-session-1] discriminator local 10 HRP_S[USG_B-bfd-session-1] discriminator remote 20 HRP_S[USG_B-bfd-session-1] commit HRP_S[USG_B-bfd-session-1] quit # On Router_B, configure BFD session 1, and set the peer IP address to 10.100.40.2, local identifier to 20, and remote identifier to 10. 5. On USG_A, configure the interworking between BFD sessions and the two-node cluster hot backup. HRP_S[USG_B] hrp track bfd-session 10 slave Note: The USG6000 configuration must be consistent with the key configuration of the USG2000&5000. This case takes the USG2000&5000 as an example to describe the configuration. You can learn the USG6000 configuration in other configurations. For specific configurations, click Method used to configure interworking between BFD sessions and the two-node cluster hot backup client on the USG firewall.

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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