Draytek Vigor3900 User Manual page 83

Vigor3900 Series User's Guide
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4. Click the High Availability Profile Setup tab to create HA profile(s). Click Add.
5. Create an HA profile. Refer to the following figures.
6. Now, the configuration for router B has been finished.
After finished the above settings, it is the time to activate HA function for both router A and
router B. It is recommended to activate the HA for router A (Primary) before router B
(Secondary).

Simply open Applications>>High Availability and click the High Availability
Global Setup. Locate Enable High Availability. Check the box and click Apply to
save the settings.
Under such construction, when Router A (defined as Master device) is powered off,
Router B (defined as Slave device) will be up and take over all the jobs that Router A
performs. Later, when Router A is powered on again, all the jobs will return to Router
A.
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