Draytek Vigor3900 User Manual page 299

Item
Vigor3900 Series User's Guide
Description
device (master device).
Authentication Key – Type a string as the authentication key.
It is used for encrypting the HA session communication to
prevent malicious attack.
Advance Preemption Mode – Specify a mode for changing
the Config Synchronization Role.

Automatic – The router will be restored to primary
(master) router once the service is restored.

Automatic_Delayed – The router must wait for a period
of time to restore to primary (master) router when the
service is restored.
Delayed Interval: Specify the time for waiting.

Manual – Restoring must be done according to the setting
of Manual Preemption Status.
Manual Preemption Status – Click Active or Inactive.
Manual Mode Threshold – Set a period of time for the
system to determine the master router when there is no
master router detected.
If the router is set as Primary (Master) router, and you change
the Manual Preemption Status from Active to Inactive. Once
the router (Primary) detects that it is in Inactive state, it will not
take preemption. However, if there is no secondary router
taking over the service, all the data traffic would be terminated.
To solve the problem, two methods can be executed:
1. Simply reset Manual Preemption Status from Inactive to
Active and then click Apply to save the settings.
2. Set the value for Manual Mode Threshold. After passing the
time configured in Manual Mode Threshold, if the system
detects no master router (primary) router existing, then
Manual Preemption Status will be reset to Active to locate
the master router.
Secondary – It means such Vigor router is treated as the
secondary device (slave device). The secondary router will
copy the configuration from the primary router to make itself as
primary.
Authentication Key – Type a string as the authentication key.
It is used for encrypting the HA session communication to
prevent malicious attack.
Advance Preemption Mode – Specify a mode for changing
the Config Synchronization Role.
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