[Vigor3900] What is High Availability (HA)?

Support Model : Vigor3900

High Availability (HA) is the feature that ensures the business continuity for your organization. IT staff can take HA as a simple solution for the disaster recovery. DrayTek utilizes the Common Address Redundancy Protocol (CARP) to avoid the system downtime, which could stop the normal operation and then causes considerable loss of the entire organization.

As enabling the HA feature, the network administrator can set another Vigor3900(s) as the backup device(s) to deliver full routing services during the downtime of the main Vigor3900. The network administrator can use the Virtual IP (e.g., 192.168.39.3) for both master device and backup device HA configurations. During the system uptime, the master device (e.g., 192.168.39.1) would offer services and act as the Virtual IP. When the master device is temporarily out-of-service, the backup device(s) (e.g., 192.168.39.2) acts the Virtual IP and delivers all routing functions.

This document will introduce the difference between Hot-Standby mode and Active-Standby mode and the parameters in HA settings. (For HA on Vigor2925 and Vigor2860 series, please refer to the article here.)

 

Hot-Standby mode and Active-Standby mode

Hot-Standby mode:

The primary and the secondary devices use the same public IP address for Internet Access. The secondary device will auto-synchronize the configurations from the primary device and the configuration can not be different from the primary device. The secondary device is always idle when the primary device is operating. When the primary device is down or is detecting no active switch port of its LAN or WAN interface, the secondary device will be up and take over the primary role.

   

 

 

Active-Standby mode:

The primary and the secondary devices use different public IP address for Internet Access. The secondary device uses its own configuration which can be different from the primary device. The secondary device is also operating while the primary device is up and running.

   

 

 

Advanced Parameters

 Parameter  Description
 Redundant Method

 Hot-Standby: The Secondary Router remains idle until detecting the malfunction of the Primary Router.
 Active-Standby: Primary Router and the Secondary Router can work simultaneously.

 Config Synchronization Role  Only for Hot-Standby mode. The Secondary Router will synchronize the configurations from the Primary Router automatically.
 Config Synchronization IP  The IP address of the Primary Router.
 Authentication Key  The key to encrypt the HA session. It prevents the HA system get stopped by attacks from fake HA control packets.
 Members in the same HA Group/VHID should have the same Authentication Key.
 Advance Preemption Mode

 For Hot-Standby mode only. User can choose it so the Primary Router takes back the Master role once it is up again.
 Automatic: Primary Router will take back the Master role once it is up from the last failure.
 Automatic Delayed: Add the delay before the Primary Router takes back the Master role.
 Manual: The Primary Router won’t take back the Master role automatically until administrator re-actives it manually.

 LAN Port Detection Mode

 At Least One UP: Primary Router will detect if the LAN Port Members in HA LAN Profiles are up, and will do HA while detecting none
 of the LAN Port Members is up.
 All Must Be UP: Primary Router will detect if all the LAN Port Members in HA LAN Profiles are up, and will do HA while detecting any
 LAN Port Member is down. While selecting this mode, it is necessary to remove the LAN ports (for example: the LAN port3/ fiber LAN
 port.) that are not used from the LAN profile members in LAN >> Switch.

 

 

See also:

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