Ii-5-11 High Availability; Ii-5-11-1 General Setup - Draytek Vigor3910 Series User Manual

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The High Availability (HA) feature of the router provides redundancy of network resources,
and reduces downtime in case of component failure. The level of sophistication of HA is
determined by availability requirements and tolerance of system interruptions. Systems that
provide near full-time availability typically have redundant hardware and software.
The HA of the Vigor3910 Series is designed to avoid single points-of-failure. When failures
occur, the failover process transfers the network load handled by the failed component (the
primary router) to the backup component (the secondary router), and the availability of
network resources are preserved and partially failed transactions are recovered. In a matter
of seconds the system returns to normal operation.
In order to set up High Availability, at least 2 DrayTek routers have to be configured in the
following manner:
 Enable High Availability on both the primary and secondary routers.
Set a high priority ID on the primary router, and a lower priority ID on the secondary

router.
 Configure identical redundancy methods, group IDs, and authentication keys on both
routers.
 Set the management interface of both routers to the same subnet.
Enable virtual IP on both routers for each subnet in use. Make sure the virtual IPs are
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identical on both routers.
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Open Applications>>High Availability to get the following page.
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Vigor3910 Series User's Guide