Configuring HA

To configure the HA function, take the following steps:

1. Configure a HA group.
2. Configure a HA Virtual Forward Interface. For more information on configuring the interface, see Configuring an Interface.
3. Configure a HA link interface which is used for the device synchronization and HA packets transmission.
4. Configure a HA cluster. Specify the ID of HA cluster and enable the HA function.

Configuring HA

To configure HA, take the following steps:

1. Select System > HA from the menu bar. In the HA dialog, configure the options as below:
   • Control link interface 1: Specifies the name of the HA control link interface. The control link interface is used to synchronize all data between two devices.
   • Interface 2: Specifies the name of HA control link interface (Backup device).
   • Data link interface： Specifies the name of the HA data link interface. The data link interface is used to synchronize the data packet information. After specifying this data link, the session information will be synchronized over this data link. You can configure the physical interface or aggregate interface as the interface of the data link and you can specify at most 1 HA data link interface.
   • IP address: Specifies the IP address and netmask of the HA link interface.
   • HA cluster ID: Specifies an ID for HA cluster. The value ranges from 0 to 8. None indicates to disable the HA function.
   • Node ID: After enabling the HA　function, specifies the Node ID (HA Node) for the device. The IDs for two devices must be different.  The range is 0 to 1. If you do not specify this value, the devices will obtain the Node ID by automatic negotiation.
   • Peer-mode: Selects the Enable checkbox to enable the HA Peer mode and specifies the role of this device in the HA cluster. The range is 0 to 1. By default, the group 0 in the device whose HA Node ID is 0 will be active and the group 0 in the device whose HA Node ID is will be in the disabled status.
   • Symmetric-routing:
     • Select Symmetric-routing to make the device work in the symmetrical routing environment.
     • Priority: Specifies the priority for the device. The device with higher priority (smaller number) will be selected as the primary device.
     • Preempt: Configure the preempt mode. When the preempt mode is enabled, once the backup device find its own priority is higher than the primary device, it will upgrade itself to the primary device and the original primary device will become the backup device. The value of 0 indicates to disable the preempt mode. When the preempt mode is disabled, even if the device's priority is higher than the primary device, it will not take over the primary device unless the primary device fails.
     • Hello interval: Specifies the Hello interval value. Hello interval refers to the interval for the HA device to send heartbeats (Hello packets) to other devices in the HA group. The Hello interval in the same HA group must be identical.
     • Hello threshold: Specifies the threshold value of the Hello message. If the device does not receive the specified number of Hello messages from the other device, it will suppose the other device's heartbeat stops.
     • Gratuitous ARP packet number: Specifies the number of gratuitous ARP packets. When the backup device is selected as the primary device, it will send an ARP request packet to the network to inform the relevant network devices to update its ARP table.
     • Track object: Specifies the track object you have configured. The track object is used to monitor the working status of the device. Once finding the device cannot work normally, the system will take the corresponding action.
     • Description: Type the descriptions of HA group into the box.
   • You can click to add and configure HA group 1 if needed.
   • Click OK to save your settings.